I'm trying to decode and encode a Bitmap image. On some devices it runs perfectly while on others it's not. I'm uploading Base64 String to the server and getting Base64 String from the server. I've found various solutions but still am not able to solve my issue. Here's my code:
我正在尝试解码和编码位图图像。在某些设备上，它运行得很完美，而在另一些设备上则不然。我将Base64字符串上传至服务器，并从服务器获取Base64字符串。我找到了各种解决办法，但仍然不能解决我的问题。这是我的代码:
Encoding:
编码:
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
getActivity().startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
//Image loading from Gallery
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK
&& null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
picturePath = cursor.getString(columnIndex);
cursor.close();
imageView1.setImageBitmap(BitmapFactory.decodeFile(picturePath));
if (picturePath != null && !TextUtils.isEmpty(picturePath)) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap bitmap = BitmapFactory.decodeFile(picturePath, options);
base64ImageSend = ImageBase64.encodeTobase64(bitmap);
Log.i("Base 64 Image", base64ImageSend);
} else {
base64ImageSend = "";
}
}
}
Decoding:
解码:
private String base64StringReceive = "/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEB AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/2wBDAQEBAQEBAQEBAQEBAQEBAQEBAQEB AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/wAARCADhAOEDASIA AhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQA AAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3 ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWm p6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEA AwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSEx BhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl8RcYGRomJygpKjU2Nzg5OkNERUZHSElK U1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6goOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3 uLm6wsPExcbHyMnK0tPU1dbX2Nna4uPk5ebn6Onq8vP09fb3+Pn6/9oADAMBAAIRAxEAPwD+/iii igAooooAKKKKACiiigAooriPH/xB8GfC7wd4i+IPj3XbHw54T8J6e+p+INe1BilnYaerFWkdgc8n 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button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Bitmap bitmap = ImageBase64.decodeBase64(base64StringReceive,MainActivity.this);
imageView2.setImageBitmap(bitmap);
}
});
ImageBase64.java:
ImageBase64.java:
import java.io.ByteArrayOutputStream;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Base64;
import android.util.Log;
public static String encodeTobase64(Bitmap image) {
ByteArrayOutputStream baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,100, baos);
byte [] b=baos.toByteArray();
String temp=null;
try{
System.gc();
temp=Base64.encodeToString(b, Base64.DEFAULT);
}catch(Exception e){
e.printStackTrace();
}catch(OutOfMemoryError e){
baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,50, baos);
b=baos.toByteArray();
temp=Base64.encodeToString(b, Base64.DEFAULT);
Log.e("EWN", "Out of memory error catched");
}
return temp;
}
public static Bitmap decodeBase64(String input,Context context) {
byte[] decodedByte = Base64.decode(input, 0);
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"myFile");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(context.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".jpg";// also tried .txt as file extension
File image = new File(sdCardDirectory, nw);
// Encode the file as a PNG image.
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
outStream.write(input.getBytes());
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Log.i("Compress bitmap path", image.getPath());
return decodeFile(image); // BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
}
private static Bitmap decodeFile(File f){
try {
//Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
//The new size we want to scale to
final int REQUIRED_SIZE=70;
//Find the correct scale value. It should be the power of 2.
int scale=1;
while(o.outWidth/scale>=REQUIRED_SIZE && o.outHeight/scale>=REQUIRED_SIZE)
scale*=2;
//Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {}
return null;
}
Error Stack:
错误堆栈:
java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:510)
at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:533)
at com.utility.ImageBase64.decodeBase64(ImageBase64.java:32)
at com.activity.HomeFragment.onCreateView(HomeFragment.java:138)
at android.app.Fragment.performCreateView(Fragment.java:1700)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:890)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
at android.app.BackStackRecord.popFromBackStack(BackStackRecord.java:773)
at android.app.FragmentManagerImpl.popBackStackState(FragmentManager.java:1498)
at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:495)
at android.app.Activity.onBackPressed(Activity.java:2232)
at com.activity.MainActivity.onBackPressed(MainActivity.java:534)
at android.app.Activity.onKeyUp(Activity.java:2210)
at android.view.KeyEvent.dispatch(KeyEvent.java:2664)
at android.app.Activity.dispatchKeyEvent(Activity.java:2440)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1962)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:3884)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3858)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3476)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3445)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3552)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3453)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3609)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3476)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3445)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3453)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3476)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3445)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3585)
at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:3750)
at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2027)
at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1721)
at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1712)
at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2004)
at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:138)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:5050)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:806)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
at dalvik.system.NativeStart.main(Native Method)
I'm also getting this error too in some devices:
我在一些设备上也犯了这个错误
java.lang.OutOfMemoryError: Failed to allocate a 38340876 byte allocation with 994361 free bytes and 971KB until OOM
at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:655)
at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:678)
at com.myapp.utility.ImageBase64.decodeBase64(ImageBase64.java:53)
at com.myapp.activity.DetailProfileFragment.onCreateView(DetailProfileFragment.java:103)
at android.app.Fragment.performCreateView(Fragment.java:2114)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:904)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1082)
at android.app.BackStackRecord.run(BackStackRecord.java:833)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:452)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5944)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1389)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1184)
Solutions that I have already tried are:
我已经尝试过的解决方案是:
-
Strange out of memory issue while loading an image to a Bitmap object
在将图像加载到位图对象时，出现了内存问题。
-
How to convert a image into Base64 string?
如何将图像转换为Base64字符串?
-
Out of Memory Error ImageView issue
退出内存错误ImageView问题。
-
Out of memory error on Android
在Android上的内存错误。
-
Image encoding and Decoding using Base64 in android application
在android应用中使用Base64进行图像编码和解码。
7 个解决方案
#1
15
When showing Bitmap in ImageView from a file first decode it with the help of BitmapHelper.decodeFile(picturePath, 200, 200, true) this will return compressed Bitmap so that while encoding this Bitmap you can handle high resolution images as well as heavy size images upto 100 MB of file.
当在ImageView中显示位图时，首先要在BitmapHelper.decodeFile(picturePath, 200,200, true)的帮助下对其进行解码，这将返回压缩的位图，这样在编码这个位图时，你可以处理高分辨率的图像，也可以处理高达100mb的大尺寸图像。
After decoding file set it to your ImageView and to get Base64 String form above compressed image using BitmapHelper class; get Bitmap from your ImageView (i.e. already been compressed) and use ImageBase64.encodeTobase64(bitmap) this will again compress the file and make handle OutOfMemory exception while Encoding a Bitmap.
在解码文件将其设置为您的ImageView，并使用BitmapHelper类获得上述压缩图像的Base64字符串形式;从您的ImageView获取位图(即已经被压缩)并使用ImageBase64.encodeTobase64(位图)，这将再次压缩文件，并在编码位图时处理OutOfMemory异常。
For decoding first write your Base64String to file in your device memory. Then read Bytes in chunks and decode that ByteArray by this you will have your bitmap in your memory. After this scale down this bitmap using decodeFile() method then you will have compressed Bitmap from Base64String
对于解码，首先将Base64String写入到设备内存中。然后用块读取字节，然后通过这个方法解码，你将在你的内存中有你的位图。通过使用decodeFile()方法缩小这个位图之后，您将从base64字符串中得到压缩的位图。
I have searched various blogs and post and from them I have taken best suitable code and combined them into one to make more reliable. Try below code to make encoding and decoding more faster with meory management.
我已经搜索了各种各样的博客和帖子，并且从他们那里获得了最合适的代码，并将它们组合成一个更可靠的代码。尝试下面的代码，以使编码和解码更快的管理。
To decode Base64String
解码Base64String
Bitmap bitmap = ImageBase64.decodeBase64(base64ImageStr,MainActivity.this);
imageView.setImageBitmap(bitmap);
bitmap = null;
System.gc();
To encode Bitmap Try this:
要编码位图，请尝试以下方法:
imageView.setImageBitmap(BitmapHelper.decodeFile(picturePath, 200, 200, true));
Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
base64ImageStr = ImageBase64.encodeTobase64(bitmap);
Try This code for ImageBase64
为ImageBase64尝试此代码。
public class ImageBase64 {
private ImageBase64() {
super();
}
private static Context appContext;
public static String encodeTobase64(Bitmap image) {
ByteArrayOutputStream baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,100, baos);
byte [] b=baos.toByteArray();
String temp=null;
try{
System.gc();
temp=Base64.encodeToString(b, Base64.DEFAULT);
}catch(Exception e){
e.printStackTrace();
}catch(OutOfMemoryError e){
baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,50, baos);
b=baos.toByteArray();
temp=Base64.encodeToString(b, Base64.DEFAULT);
Log.e("EWN", "Out of memory error catched");
}
return temp;
}
public static Bitmap decodeBase64(String input,Context context) {
byte[] decodedByte = Base64.decode(input, 0);
appContext = context;
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"IMG");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(context.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".txt";
File image = new File(sdCardDirectory, nw);
// Encode the file as a PNG image.
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
outStream.write(input.getBytes());
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Log.i("Compress bitmap path", image.getPath());
Bitmap bitmap;
try{
bitmap = BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
}catch(OutOfMemoryError e){
e.printStackTrace();
InputStream is = context.getResources().openRawResource(R.drawable.default_profile_pic);
bitmap = BitmapFactory.decodeStream(is);
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
bitmap=null;
}
return bitmap;//BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
//return decodeFile(image);
}
private static Bitmap decodeFile(File f){
try {
//Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
//The new size we want to scale to
final int REQUIRED_SIZE=70;
//Find the correct scale value. It should be the power of 2.
int scale=1;
while(o.outWidth/scale>=REQUIRED_SIZE && o.outHeight/scale>=REQUIRED_SIZE)
scale*=2;
//Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
Bitmap bmp = BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"IMG");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(appContext.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".png";
File image = new File(sdCardDirectory, nw);
FileOutputStream out = null;
try {
out = new FileOutputStream(image);
bmp.compress(Bitmap.CompressFormat.PNG, 100, out); // bmp is your Bitmap instance
// PNG is a lossless format, the compression factor (100) is ignored
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
String pathNew =compressImage(image.getAbsolutePath());
Uri uri = Uri.parse(pathNew);
Bitmap bitmap=null ;
try {
bitmap = MediaStore.Images.Media.getBitmap(appContext.getContentResolver(),uri);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return bitmap;
} catch (FileNotFoundException e) {}
return null;
}
public static String compressImage(String imageUri) {
String filePath = imageUri;//getRealPathFromURI(imageUri);
Bitmap scaledBitmap = null;
BitmapFactory.Options options = new BitmapFactory.Options();
// by setting this field as true, the actual bitmap pixels are not loaded in the memory. Just the bounds are loaded. If
// you try the use the bitmap here, you will get null.
options.inJustDecodeBounds = true;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
// max Height and width values of the compressed image is taken as 816x612
float maxHeight = 816.0f;
float maxWidth = 612.0f;
float imgRatio = actualWidth / actualHeight;
float maxRatio = maxWidth / maxHeight;
// width and height values are set maintaining the aspect ratio of the image
if (actualHeight > maxHeight || actualWidth > maxWidth) {
if (imgRatio < maxRatio) { imgRatio = maxHeight / actualHeight; actualWidth = (int) (imgRatio * actualWidth); actualHeight = (int) maxHeight; } else if (imgRatio > maxRatio) {
imgRatio = maxWidth / actualWidth;
actualHeight = (int) (imgRatio * actualHeight);
actualWidth = (int) maxWidth;
} else {
actualHeight = (int) maxHeight;
actualWidth = (int) maxWidth;
}
}
// setting inSampleSize value allows to load a scaled down version of the original image
options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);
// inJustDecodeBounds set to false to load the actual bitmap
options.inJustDecodeBounds = false;
// this options allow android to claim the bitmap memory if it runs low on memory
options.inPurgeable = true;
options.inInputShareable = true;
options.inTempStorage = new byte[16 * 1024];
try {
// load the bitmap from its path
bmp = BitmapFactory.decodeFile(filePath, options);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
try {
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight,Bitmap.Config.ARGB_8888);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
float ratioX = actualWidth / (float) options.outWidth;
float ratioY = actualHeight / (float) options.outHeight;
float middleX = actualWidth / 2.0f;
float middleY = actualHeight / 2.0f;
Matrix scaleMatrix = new Matrix();
scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);
Canvas canvas = new Canvas(scaledBitmap);
canvas.setMatrix(scaleMatrix);
canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2, middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));
// check the rotation of the image and display it properly
ExifInterface exif;
try {
exif = new ExifInterface(filePath);
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION, 0);
Log.d("EXIF", "Exif: " + orientation);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
Log.d("EXIF", "Exif: " + orientation);
} else if (orientation == 3) {
matrix.postRotate(180);
Log.d("EXIF", "Exif: " + orientation);
} else if (orientation == 8) {
matrix.postRotate(270);
Log.d("EXIF", "Exif: " + orientation);
}
scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix,
true);
} catch (IOException e) {
e.printStackTrace();
}
FileOutputStream out = null;
String filename = getFilename();
try {
out = new FileOutputStream(filename);
// write the compressed bitmap at the destination specified by filename.
scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return filename;
}
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int heightRatio = Math.round((float) height/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio; } final float totalPixels = width * height; final float totalReqPixelsCap = reqWidth * reqHeight * 2; while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
inSampleSize++;
}
return inSampleSize;
}
public static String getFilename() {
/*File file = new File(Environment.getExternalStorageDirectory().getPath(), "IMG/Images");
if (!file.exists()) {
file.mkdirs();
}
String uriSting = (file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".jpg");
*/
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath(),
"IMG/Images");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(appContext.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "img_" + timeStamp + randomNum+".jpg";
File image = new File(sdCardDirectory, nw);
String uriSting1 = (sdCardDirectory.getAbsolutePath() + "/" + nw);//System.currentTimeMillis() + ".jpg");
return uriSting1;
}
}
Add this class to handle heavy images
添加这个类来处理重图像。
public class BitmapHelper
{
//decodes image and scales it to reduce memory consumption
public static Bitmap decodeFile(String bitmapFile, int requiredWidth, int requiredHeight, boolean quickAndDirty)
{
try
{
//Decode image size
BitmapFactory.Options bitmapSizeOptions = new BitmapFactory.Options();
bitmapSizeOptions.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bitmapSizeOptions);
// load image using inSampleSize adapted to required image size
BitmapFactory.Options bitmapDecodeOptions = new BitmapFactory.Options();
bitmapDecodeOptions.inTempStorage = new byte[16 * 1024];
bitmapDecodeOptions.inSampleSize = computeInSampleSize(bitmapSizeOptions, requiredWidth, requiredHeight, false);
bitmapDecodeOptions.inPurgeable = true;
bitmapDecodeOptions.inDither = !quickAndDirty;
bitmapDecodeOptions.inPreferredConfig = quickAndDirty ? Bitmap.Config.RGB_565 : Bitmap.Config.ARGB_8888;
Bitmap decodedBitmap = BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bitmapDecodeOptions);
// scale bitmap to mathc required size (and keep aspect ratio)
float srcWidth = (float) bitmapDecodeOptions.outWidth;
float srcHeight = (float) bitmapDecodeOptions.outHeight;
float dstWidth = (float) requiredWidth;
float dstHeight = (float) requiredHeight;
float srcAspectRatio = srcWidth / srcHeight;
float dstAspectRatio = dstWidth / dstHeight;
// recycleDecodedBitmap is used to know if we must recycle intermediary 'decodedBitmap'
// (DO NOT recycle it right away: wait for end of bitmap manipulation process to avoid
// java.lang.RuntimeException: Canvas: trying to use a recycled bitmap android.graphics.Bitmap@416ee7d8
// I do not excatly understand why, but this way it's OK
boolean recycleDecodedBitmap = false;
Bitmap scaledBitmap = decodedBitmap;
if (srcAspectRatio < dstAspectRatio)
{
scaledBitmap = getScaledBitmap(decodedBitmap, (int) dstWidth, (int) (srcHeight * (dstWidth / srcWidth)));
// will recycle recycleDecodedBitmap
recycleDecodedBitmap = true;
}
else if (srcAspectRatio > dstAspectRatio)
{
scaledBitmap = getScaledBitmap(decodedBitmap, (int) (srcWidth * (dstHeight / srcHeight)), (int) dstHeight);
recycleDecodedBitmap = true;
}
// crop image to match required image size
int scaledBitmapWidth = scaledBitmap.getWidth();
int scaledBitmapHeight = scaledBitmap.getHeight();
Bitmap croppedBitmap = scaledBitmap;
if (scaledBitmapWidth > requiredWidth)
{
int xOffset = (scaledBitmapWidth - requiredWidth) / 2;
croppedBitmap = Bitmap.createBitmap(scaledBitmap, xOffset, 0, requiredWidth, requiredHeight);
scaledBitmap.recycle();
}
else if (scaledBitmapHeight > requiredHeight)
{
int yOffset = (scaledBitmapHeight - requiredHeight) / 2;
croppedBitmap = Bitmap.createBitmap(scaledBitmap, 0, yOffset, requiredWidth, requiredHeight);
scaledBitmap.recycle();
}
if (recycleDecodedBitmap)
{
decodedBitmap.recycle();
}
decodedBitmap = null;
scaledBitmap = null;
return croppedBitmap;
}
catch (Exception ex)
{
ex.printStackTrace();
}
return null;
}
/**
* compute powerOf2 or exact scale to be used as {@link BitmapFactory.Options#inSampleSize} value (for subSampling)
*
* @param requiredWidth
* @param requiredHeight
* @param powerOf2
* weither we want a power of 2 sclae or not
* @return
*/
public static int computeInSampleSize(BitmapFactory.Options options, int dstWidth, int dstHeight, boolean powerOf2)
{
int inSampleSize = 1;
// Raw height and width of image
final int srcHeight = options.outHeight;
final int srcWidth = options.outWidth;
if (powerOf2)
{
//Find the correct scale value. It should be the power of 2.
int tmpWidth = srcWidth, tmpHeight = srcHeight;
while (true)
{
if (tmpWidth / 2 < dstWidth || tmpHeight / 2 < dstHeight)
break;
tmpWidth /= 2;
tmpHeight /= 2;
inSampleSize *= 2;
}
}
else
{
// Calculate ratios of height and width to requested height and width
final int heightRatio = Math.round((float) srcHeight / (float) dstHeight);
final int widthRatio = Math.round((float) srcWidth / (float) dstWidth);
// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
public static Bitmap drawableToBitmap(Drawable drawable)
{
if (drawable instanceof BitmapDrawable)
{
return ((BitmapDrawable) drawable).getBitmap();
}
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
public static Bitmap getScaledBitmap(Bitmap bitmap, int newWidth, int newHeight)
{
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// CREATE A MATRIX FOR THE MANIPULATION
Matrix matrix = new Matrix();
// RESIZE THE BIT MAP
matrix.postScale(scaleWidth, scaleHeight);
// RECREATE THE NEW BITMAP
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
}
#2
13
I would suggest you to:
我建议你:
-
If you receive data from a server using xml-based protocol - use SAX parser instead of DOM.
如果您使用基于xml的协议从服务器接收数据——使用SAX解析器而不是DOM。
-
Do not load the whole base64 string in to the memory. Use
InputStreamto load portion of data in to thebyte[]array, decode Base64 from the array and append the result to a cache file viaFileOutputStream.不要将整个base64字符串加载到内存中。使用InputStream将数据的部分加载到字节[]数组中，从数组中解码Base64，并通过FileOutputStream将结果追加到缓存文件中。
-
Use options.inJustDecodeBounds option to prevent a full-scale bitmap file loading in to the memory. You can evaluate the total amount of memory required and make a decision to scale it down, for example. UPD. I noticed you are using it already.
使用选项。损伤解码的选项，以防止一个全面的位图文件加载到内存中。例如，您可以评估所需的内存总量，并决定将其缩减。乌利希期刊指南。我注意到你已经在用它了。
-
Keep in mind object references you are holding and passing trough your methods flow. Strong references prevents memory from to be reclaimed by GC.
记住你所持有的对象引用，并通过你的方法流。强引用可防止GC回收内存。
Following your code: method decodeBase64 holds String input argument parameter in the stack, byte[] decodedBytereference and return BitmapFactory.decodeStream(new FileInputStream(f), null, o2) at the very end. Holding all these objects in the memory at the same time means big pressure on GC and memory allocation in general. As a simplest solution you can null references just after corresponding objects were used (string and byte array), so GC will be able to free up them.
按照您的代码:方法decodeBase64在堆栈中保存字符串输入参数参数，字节[]解码，返回位mapfactory . decodestream(新FileInputStream(f)， null, o2)。在内存中同时保存所有这些对象意味着GC和内存分配的巨大压力。作为一个最简单的解决方案，您可以在使用了相应对象(字符串和字节数组)之后对其进行空引用，因此GC将能够释放它们。
#3
6
Try With this pseudo code: Let me know if you have any questions
试试这个伪代码:如果您有什么问题，请告诉我。
Bitmap bmp = (Bitmap) data.getExtras().get("data");
img.setImageBitmap(bmp);
btnadd.requestFocus();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] b = baos.toByteArray();
encodedImageString = Base64.encodeToString(b, Base64.DEFAULT);
byte[] bytarray = Base64.decode(encodedImageString, Base64.DEFAULT);
Bitmap bmimage = BitmapFactory.decodeByteArray(bytarray, 0,
bytarray.length);
#4
5
You are not base64 encoding a Bitmap instance (as you suggest in your post and even in the subject) but a byte array b in String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);. The byte array 'b' contains the bytes of what would be the content of a .jpg file if you would write these bytes to file.
您不是base64编码位图实例(如您在文章中所建议的，甚至在主题中)，而是字符串imageEncoded = base64中的字节数组b。encodeToString(b,Base64.DEFAULT);。字节数组'b'包含了一个.jpg文件内容的字节，如果您将这些字节写入文件。
What you have to do is put the contents of the .jpg file which you want to upload directly in a byte array. Then encode that array.
你要做的是把你想要直接上传的。jpg文件的内容放到一个字节数组中。然后编码阵列。
Google for android put file content in byte array. Code has been posted many times on this site
android的谷歌将文件内容放在字节数组中。代码在这个站点上已经发布了很多次。
#5
5
As greenapps suggested, it would be better to avoid using Bitmap and BitmapFactory in order to TRANSMIT the file:
正如greenapps建议的那样，最好避免使用位图和位图工厂来传输文件:
FileInputStream fis = new FileInputStream(imageFile);
byte[] byteArray = inputStreamToByteArray(fis);
String base64ImageSend = Base64.encodeToString(byteArray, Base64.NO_WRAP);
where:
地点:
/**
* Convert an InputStream object into a byte array
* @param inputStream The InputStream to convert
* @return The byte[] representing the converted InputStream or null if the inputStream is null
*/
public static byte[] inputStreamToByteArray(InputStream inputStream) throws IOException {
if(inputStream==null) {
return null;
}
ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
byteBuffer.write(buffer, 0, len);
}
return byteBuffer.toByteArray();
}
Actually the outOfMemory problem, as stated by Kai, is due to the fact that you are decoding a full resolution and high quality image. The better way to avoid this is to downsampling your image:
实际上，由Kai所述的outOfMemory问题是由于您正在解码一个完整的分辨率和高质量的图像。避免这种情况的更好方法是对你的图像进行向下采样:
/**
* Decode a file, representing an image, into a bitmap, trying to scale the original image if required
* @param context The application context
* @param file The image file
* @param requestedWidth The requested width
* @param requestedHeight The requested height
* @return The decoded bitmap or null if it is not possible to decode the file parameter
*/
public static Bitmap decodeImageFileIntoMutableBitmap(Context context, File file, int requestedWidth, int requestedHeight) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true; // just compute size, don't create bitmap
BitmapFactory.decodeFile(file.getAbsolutePath(), options);
float sampleSize = computeImageScaleCoefficient(options, requestedWidth, requestedHeight);
if (sampleSize == -1) {
return null;
}
else if (sampleSize <= 1) {
options.inSampleSize = 1;
}
else {
options.inSampleSize = (int) sampleSize;
}
options.inJustDecodeBounds = false; // compute size and create bitmap
/*it is possible to reduce the memory when decoding through skipping ARGB_8888 and using RGB_565 instead and inDither to true to preserve image quality.*/
//options.inPreferredConfig = Bitmap.Config.RGB_565;
//options.inDither = true;
Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
if (bitmap == null) {
return null;
}
return bitmap;
}
/**
* Find the sample coefficient <code><b>s<sub>k</sub></b>=2<sup>k</sup></code>, with <code>k &isin ℕ</code>, such that
* <code>min<sub>k</sub>(requestedWidth-options.outWidth×<b>s<sub>k</sub></b>)>0</code>
* <code>&&</code>
* <code>min<sub>k</sub>(requestedHeight-options.outHeight×<b>s<sub>k</sub></b>)>0</code>
* @param options The BitmapFactory.Options instance of the original image user wants to scale
* @param requestedWidth The requested width
* @param requestedHeight The requested height
* @return -1 if if there is an error trying to decode the image
* or the sample coefficient <code><b>s<sub>k</sub></b></code>,
* >1 if the image needs to be down-sampled,
* <1 if the image needs to be up-sampled
*/
public static float computeImageScaleCoefficient(BitmapFactory.Options options, int requestedWidth, int requestedHeight) {
float sampleCoefficient = 1;
int imageWidth = options.outWidth;
int imageHeight = options.outHeight;
if (imageWidth == -1 || imageHeight == -1) {
return -1;
}
double outWidth = imageWidth;
double outHeight = imageHeight;
if ((outWidth > requestedWidth) || (outHeight > requestedHeight)) {
while ((outWidth > requestedWidth) || (outHeight > requestedHeight)) {
outWidth = Math.floor(outWidth/2.0);
outHeight = Math.floor(outHeight/2.0);
sampleCoefficient *= 2.0;
}
}
else {
while ((outWidth < requestedWidth) && (outHeight < requestedHeight)) {
outWidth *= 2;
outHeight *= 2;
if ((outWidth <= requestedWidth) && (outHeight <= requestedHeight)) {
sampleCoefficient /= 2.0;
}
}
}
return sampleCoefficient;
}
#6
4
Just increase the heap size of your application in manifest file.
只需要在manifest文件中增加应用程序的堆大小。
android:largeHeap="true"
eg:
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/Theme.AppTheme"
android:largeHeap="true" >
#7
2
You can try this, it should solve your problem.
你可以试试这个，它可以解决你的问题。
Basically first saving the data to a file, using a buffer to avoid memory problems. After that we check and resize the file - loading directly a resized Bitmap, again to avoid memory problems.
首先将数据保存到文件中，使用缓冲区来避免内存问题。在此之后，我们检查和调整文件的大小，直接加载一个大小调整的位图，以避免内存问题。
From what I can suppose, you are getting the encoded string from a server... so you can manage your code to directly write to the file.
根据我的推测，您是从服务器获取编码字符串…因此，您可以管理您的代码直接写入文件。
Writing the data to the file:
将数据写入文件:
private Bitmap getBitmapThumbnail(String base64StringReceive) {
byte[] data = Base64.decode(base64StringReceive, Base64.DEFAULT);
File file = new File(getFilesDir(), "testFile");
try {
BufferedOutputStream bos = new BufferedOutputStream(openFileOutput("testFile", Context.MODE_PRIVATE),1024);
bos.write(data);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return getThumbFromFile(file, false);
}
Creating the thumbnail from the image file:
从图像文件创建缩略图:
private Bitmap getThumbFromFile(File file) {
Bitmap tempImage = null;
try {
tempImage = decodeSampledBitmapFromFile(file.getAbsolutePath(), 50, 50); // this is in pixels - use your desired size
return ThumbnailUtils.extractThumbnail(tempImage, 50, 50);
} finally {
if (tempImage != null) {
tempImage.recycle();
}
}
}
Loading only a resized Bitmap:
只加载一个缩放的位图:
private Bitmap decodeSampledBitmapFromFile(String filePath, int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(filePath, options);
}
Calculating the sampling value - provided by Google, you can find it their tutorials:
计算谷歌提供的抽样值，你可以找到他们的教程:
private int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight &&
(halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}
#1
15
When showing Bitmap in ImageView from a file first decode it with the help of BitmapHelper.decodeFile(picturePath, 200, 200, true) this will return compressed Bitmap so that while encoding this Bitmap you can handle high resolution images as well as heavy size images upto 100 MB of file.
当在ImageView中显示位图时，首先要在BitmapHelper.decodeFile(picturePath, 200,200, true)的帮助下对其进行解码，这将返回压缩的位图，这样在编码这个位图时，你可以处理高分辨率的图像，也可以处理高达100mb的大尺寸图像。
After decoding file set it to your ImageView and to get Base64 String form above compressed image using BitmapHelper class; get Bitmap from your ImageView (i.e. already been compressed) and use ImageBase64.encodeTobase64(bitmap) this will again compress the file and make handle OutOfMemory exception while Encoding a Bitmap.
在解码文件将其设置为您的ImageView，并使用BitmapHelper类获得上述压缩图像的Base64字符串形式;从您的ImageView获取位图(即已经被压缩)并使用ImageBase64.encodeTobase64(位图)，这将再次压缩文件，并在编码位图时处理OutOfMemory异常。
For decoding first write your Base64String to file in your device memory. Then read Bytes in chunks and decode that ByteArray by this you will have your bitmap in your memory. After this scale down this bitmap using decodeFile() method then you will have compressed Bitmap from Base64String
对于解码，首先将Base64String写入到设备内存中。然后用块读取字节，然后通过这个方法解码，你将在你的内存中有你的位图。通过使用decodeFile()方法缩小这个位图之后，您将从base64字符串中得到压缩的位图。
I have searched various blogs and post and from them I have taken best suitable code and combined them into one to make more reliable. Try below code to make encoding and decoding more faster with meory management.
我已经搜索了各种各样的博客和帖子，并且从他们那里获得了最合适的代码，并将它们组合成一个更可靠的代码。尝试下面的代码，以使编码和解码更快的管理。
To decode Base64String
解码Base64String
Bitmap bitmap = ImageBase64.decodeBase64(base64ImageStr,MainActivity.this);
imageView.setImageBitmap(bitmap);
bitmap = null;
System.gc();
To encode Bitmap Try this:
要编码位图，请尝试以下方法:
imageView.setImageBitmap(BitmapHelper.decodeFile(picturePath, 200, 200, true));
Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
base64ImageStr = ImageBase64.encodeTobase64(bitmap);
Try This code for ImageBase64
为ImageBase64尝试此代码。
public class ImageBase64 {
private ImageBase64() {
super();
}
private static Context appContext;
public static String encodeTobase64(Bitmap image) {
ByteArrayOutputStream baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,100, baos);
byte [] b=baos.toByteArray();
String temp=null;
try{
System.gc();
temp=Base64.encodeToString(b, Base64.DEFAULT);
}catch(Exception e){
e.printStackTrace();
}catch(OutOfMemoryError e){
baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,50, baos);
b=baos.toByteArray();
temp=Base64.encodeToString(b, Base64.DEFAULT);
Log.e("EWN", "Out of memory error catched");
}
return temp;
}
public static Bitmap decodeBase64(String input,Context context) {
byte[] decodedByte = Base64.decode(input, 0);
appContext = context;
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"IMG");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(context.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".txt";
File image = new File(sdCardDirectory, nw);
// Encode the file as a PNG image.
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
outStream.write(input.getBytes());
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Log.i("Compress bitmap path", image.getPath());
Bitmap bitmap;
try{
bitmap = BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
}catch(OutOfMemoryError e){
e.printStackTrace();
InputStream is = context.getResources().openRawResource(R.drawable.default_profile_pic);
bitmap = BitmapFactory.decodeStream(is);
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
bitmap=null;
}
return bitmap;//BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
//return decodeFile(image);
}
private static Bitmap decodeFile(File f){
try {
//Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
//The new size we want to scale to
final int REQUIRED_SIZE=70;
//Find the correct scale value. It should be the power of 2.
int scale=1;
while(o.outWidth/scale>=REQUIRED_SIZE && o.outHeight/scale>=REQUIRED_SIZE)
scale*=2;
//Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
Bitmap bmp = BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"IMG");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(appContext.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".png";
File image = new File(sdCardDirectory, nw);
FileOutputStream out = null;
try {
out = new FileOutputStream(image);
bmp.compress(Bitmap.CompressFormat.PNG, 100, out); // bmp is your Bitmap instance
// PNG is a lossless format, the compression factor (100) is ignored
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
String pathNew =compressImage(image.getAbsolutePath());
Uri uri = Uri.parse(pathNew);
Bitmap bitmap=null ;
try {
bitmap = MediaStore.Images.Media.getBitmap(appContext.getContentResolver(),uri);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return bitmap;
} catch (FileNotFoundException e) {}
return null;
}
public static String compressImage(String imageUri) {
String filePath = imageUri;//getRealPathFromURI(imageUri);
Bitmap scaledBitmap = null;
BitmapFactory.Options options = new BitmapFactory.Options();
// by setting this field as true, the actual bitmap pixels are not loaded in the memory. Just the bounds are loaded. If
// you try the use the bitmap here, you will get null.
options.inJustDecodeBounds = true;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
// max Height and width values of the compressed image is taken as 816x612
float maxHeight = 816.0f;
float maxWidth = 612.0f;
float imgRatio = actualWidth / actualHeight;
float maxRatio = maxWidth / maxHeight;
// width and height values are set maintaining the aspect ratio of the image
if (actualHeight > maxHeight || actualWidth > maxWidth) {
if (imgRatio < maxRatio) { imgRatio = maxHeight / actualHeight; actualWidth = (int) (imgRatio * actualWidth); actualHeight = (int) maxHeight; } else if (imgRatio > maxRatio) {
imgRatio = maxWidth / actualWidth;
actualHeight = (int) (imgRatio * actualHeight);
actualWidth = (int) maxWidth;
} else {
actualHeight = (int) maxHeight;
actualWidth = (int) maxWidth;
}
}
// setting inSampleSize value allows to load a scaled down version of the original image
options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);
// inJustDecodeBounds set to false to load the actual bitmap
options.inJustDecodeBounds = false;
// this options allow android to claim the bitmap memory if it runs low on memory
options.inPurgeable = true;
options.inInputShareable = true;
options.inTempStorage = new byte[16 * 1024];
try {
// load the bitmap from its path
bmp = BitmapFactory.decodeFile(filePath, options);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
try {
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight,Bitmap.Config.ARGB_8888);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
float ratioX = actualWidth / (float) options.outWidth;
float ratioY = actualHeight / (float) options.outHeight;
float middleX = actualWidth / 2.0f;
float middleY = actualHeight / 2.0f;
Matrix scaleMatrix = new Matrix();
scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);
Canvas canvas = new Canvas(scaledBitmap);
canvas.setMatrix(scaleMatrix);
canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2, middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));
// check the rotation of the image and display it properly
ExifInterface exif;
try {
exif = new ExifInterface(filePath);
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION, 0);
Log.d("EXIF", "Exif: " + orientation);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
Log.d("EXIF", "Exif: " + orientation);
} else if (orientation == 3) {
matrix.postRotate(180);
Log.d("EXIF", "Exif: " + orientation);
} else if (orientation == 8) {
matrix.postRotate(270);
Log.d("EXIF", "Exif: " + orientation);
}
scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix,
true);
} catch (IOException e) {
e.printStackTrace();
}
FileOutputStream out = null;
String filename = getFilename();
try {
out = new FileOutputStream(filename);
// write the compressed bitmap at the destination specified by filename.
scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return filename;
}
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int heightRatio = Math.round((float) height/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio; } final float totalPixels = width * height; final float totalReqPixelsCap = reqWidth * reqHeight * 2; while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
inSampleSize++;
}
return inSampleSize;
}
public static String getFilename() {
/*File file = new File(Environment.getExternalStorageDirectory().getPath(), "IMG/Images");
if (!file.exists()) {
file.mkdirs();
}
String uriSting = (file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".jpg");
*/
Boolean isSDPresent = android.os.Environment
.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath(),
"IMG/Images");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(appContext.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((1000 - 0) + 1) + 0;
String nw = "img_" + timeStamp + randomNum+".jpg";
File image = new File(sdCardDirectory, nw);
String uriSting1 = (sdCardDirectory.getAbsolutePath() + "/" + nw);//System.currentTimeMillis() + ".jpg");
return uriSting1;
}
}
Add this class to handle heavy images
添加这个类来处理重图像。
public class BitmapHelper
{
//decodes image and scales it to reduce memory consumption
public static Bitmap decodeFile(String bitmapFile, int requiredWidth, int requiredHeight, boolean quickAndDirty)
{
try
{
//Decode image size
BitmapFactory.Options bitmapSizeOptions = new BitmapFactory.Options();
bitmapSizeOptions.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bitmapSizeOptions);
// load image using inSampleSize adapted to required image size
BitmapFactory.Options bitmapDecodeOptions = new BitmapFactory.Options();
bitmapDecodeOptions.inTempStorage = new byte[16 * 1024];
bitmapDecodeOptions.inSampleSize = computeInSampleSize(bitmapSizeOptions, requiredWidth, requiredHeight, false);
bitmapDecodeOptions.inPurgeable = true;
bitmapDecodeOptions.inDither = !quickAndDirty;
bitmapDecodeOptions.inPreferredConfig = quickAndDirty ? Bitmap.Config.RGB_565 : Bitmap.Config.ARGB_8888;
Bitmap decodedBitmap = BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bitmapDecodeOptions);
// scale bitmap to mathc required size (and keep aspect ratio)
float srcWidth = (float) bitmapDecodeOptions.outWidth;
float srcHeight = (float) bitmapDecodeOptions.outHeight;
float dstWidth = (float) requiredWidth;
float dstHeight = (float) requiredHeight;
float srcAspectRatio = srcWidth / srcHeight;
float dstAspectRatio = dstWidth / dstHeight;
// recycleDecodedBitmap is used to know if we must recycle intermediary 'decodedBitmap'
// (DO NOT recycle it right away: wait for end of bitmap manipulation process to avoid
// java.lang.RuntimeException: Canvas: trying to use a recycled bitmap android.graphics.Bitmap@416ee7d8
// I do not excatly understand why, but this way it's OK
boolean recycleDecodedBitmap = false;
Bitmap scaledBitmap = decodedBitmap;
if (srcAspectRatio < dstAspectRatio)
{
scaledBitmap = getScaledBitmap(decodedBitmap, (int) dstWidth, (int) (srcHeight * (dstWidth / srcWidth)));
// will recycle recycleDecodedBitmap
recycleDecodedBitmap = true;
}
else if (srcAspectRatio > dstAspectRatio)
{
scaledBitmap = getScaledBitmap(decodedBitmap, (int) (srcWidth * (dstHeight / srcHeight)), (int) dstHeight);
recycleDecodedBitmap = true;
}
// crop image to match required image size
int scaledBitmapWidth = scaledBitmap.getWidth();
int scaledBitmapHeight = scaledBitmap.getHeight();
Bitmap croppedBitmap = scaledBitmap;
if (scaledBitmapWidth > requiredWidth)
{
int xOffset = (scaledBitmapWidth - requiredWidth) / 2;
croppedBitmap = Bitmap.createBitmap(scaledBitmap, xOffset, 0, requiredWidth, requiredHeight);
scaledBitmap.recycle();
}
else if (scaledBitmapHeight > requiredHeight)
{
int yOffset = (scaledBitmapHeight - requiredHeight) / 2;
croppedBitmap = Bitmap.createBitmap(scaledBitmap, 0, yOffset, requiredWidth, requiredHeight);
scaledBitmap.recycle();
}
if (recycleDecodedBitmap)
{
decodedBitmap.recycle();
}
decodedBitmap = null;
scaledBitmap = null;
return croppedBitmap;
}
catch (Exception ex)
{
ex.printStackTrace();
}
return null;
}
/**
* compute powerOf2 or exact scale to be used as {@link BitmapFactory.Options#inSampleSize} value (for subSampling)
*
* @param requiredWidth
* @param requiredHeight
* @param powerOf2
* weither we want a power of 2 sclae or not
* @return
*/
public static int computeInSampleSize(BitmapFactory.Options options, int dstWidth, int dstHeight, boolean powerOf2)
{
int inSampleSize = 1;
// Raw height and width of image
final int srcHeight = options.outHeight;
final int srcWidth = options.outWidth;
if (powerOf2)
{
//Find the correct scale value. It should be the power of 2.
int tmpWidth = srcWidth, tmpHeight = srcHeight;
while (true)
{
if (tmpWidth / 2 < dstWidth || tmpHeight / 2 < dstHeight)
break;
tmpWidth /= 2;
tmpHeight /= 2;
inSampleSize *= 2;
}
}
else
{
// Calculate ratios of height and width to requested height and width
final int heightRatio = Math.round((float) srcHeight / (float) dstHeight);
final int widthRatio = Math.round((float) srcWidth / (float) dstWidth);
// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
public static Bitmap drawableToBitmap(Drawable drawable)
{
if (drawable instanceof BitmapDrawable)
{
return ((BitmapDrawable) drawable).getBitmap();
}
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
public static Bitmap getScaledBitmap(Bitmap bitmap, int newWidth, int newHeight)
{
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// CREATE A MATRIX FOR THE MANIPULATION
Matrix matrix = new Matrix();
// RESIZE THE BIT MAP
matrix.postScale(scaleWidth, scaleHeight);
// RECREATE THE NEW BITMAP
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
}
#2
13
I would suggest you to:
我建议你:
-
If you receive data from a server using xml-based protocol - use SAX parser instead of DOM.
如果您使用基于xml的协议从服务器接收数据——使用SAX解析器而不是DOM。
-
Do not load the whole base64 string in to the memory. Use
InputStreamto load portion of data in to thebyte[]array, decode Base64 from the array and append the result to a cache file viaFileOutputStream.不要将整个base64字符串加载到内存中。使用InputStream将数据的部分加载到字节[]数组中，从数组中解码Base64，并通过FileOutputStream将结果追加到缓存文件中。
-
Use options.inJustDecodeBounds option to prevent a full-scale bitmap file loading in to the memory. You can evaluate the total amount of memory required and make a decision to scale it down, for example. UPD. I noticed you are using it already.
使用选项。损伤解码的选项，以防止一个全面的位图文件加载到内存中。例如，您可以评估所需的内存总量，并决定将其缩减。乌利希期刊指南。我注意到你已经在用它了。
-
Keep in mind object references you are holding and passing trough your methods flow. Strong references prevents memory from to be reclaimed by GC.
记住你所持有的对象引用，并通过你的方法流。强引用可防止GC回收内存。
Following your code: method decodeBase64 holds String input argument parameter in the stack, byte[] decodedBytereference and return BitmapFactory.decodeStream(new FileInputStream(f), null, o2) at the very end. Holding all these objects in the memory at the same time means big pressure on GC and memory allocation in general. As a simplest solution you can null references just after corresponding objects were used (string and byte array), so GC will be able to free up them.
按照您的代码:方法decodeBase64在堆栈中保存字符串输入参数参数，字节[]解码，返回位mapfactory . decodestream(新FileInputStream(f)， null, o2)。在内存中同时保存所有这些对象意味着GC和内存分配的巨大压力。作为一个最简单的解决方案，您可以在使用了相应对象(字符串和字节数组)之后对其进行空引用，因此GC将能够释放它们。
#3
6
Try With this pseudo code: Let me know if you have any questions
试试这个伪代码:如果您有什么问题，请告诉我。
Bitmap bmp = (Bitmap) data.getExtras().get("data");
img.setImageBitmap(bmp);
btnadd.requestFocus();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] b = baos.toByteArray();
encodedImageString = Base64.encodeToString(b, Base64.DEFAULT);
byte[] bytarray = Base64.decode(encodedImageString, Base64.DEFAULT);
Bitmap bmimage = BitmapFactory.decodeByteArray(bytarray, 0,
bytarray.length);
#4
5
You are not base64 encoding a Bitmap instance (as you suggest in your post and even in the subject) but a byte array b in String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);. The byte array 'b' contains the bytes of what would be the content of a .jpg file if you would write these bytes to file.
您不是base64编码位图实例(如您在文章中所建议的，甚至在主题中)，而是字符串imageEncoded = base64中的字节数组b。encodeToString(b,Base64.DEFAULT);。字节数组'b'包含了一个.jpg文件内容的字节，如果您将这些字节写入文件。
What you have to do is put the contents of the .jpg file which you want to upload directly in a byte array. Then encode that array.
你要做的是把你想要直接上传的。jpg文件的内容放到一个字节数组中。然后编码阵列。
Google for android put file content in byte array. Code has been posted many times on this site
android的谷歌将文件内容放在字节数组中。代码在这个站点上已经发布了很多次。
#5
5
As greenapps suggested, it would be better to avoid using Bitmap and BitmapFactory in order to TRANSMIT the file:
正如greenapps建议的那样，最好避免使用位图和位图工厂来传输文件:
FileInputStream fis = new FileInputStream(imageFile);
byte[] byteArray = inputStreamToByteArray(fis);
String base64ImageSend = Base64.encodeToString(byteArray, Base64.NO_WRAP);
where:
地点:
/**
* Convert an InputStream object into a byte array
* @param inputStream The InputStream to convert
* @return The byte[] representing the converted InputStream or null if the inputStream is null
*/
public static byte[] inputStreamToByteArray(InputStream inputStream) throws IOException {
if(inputStream==null) {
return null;
}
ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
byteBuffer.write(buffer, 0, len);
}
return byteBuffer.toByteArray();
}
Actually the outOfMemory problem, as stated by Kai, is due to the fact that you are decoding a full resolution and high quality image. The better way to avoid this is to downsampling your image:
实际上，由Kai所述的outOfMemory问题是由于您正在解码一个完整的分辨率和高质量的图像。避免这种情况的更好方法是对你的图像进行向下采样:
/**
* Decode a file, representing an image, into a bitmap, trying to scale the original image if required
* @param context The application context
* @param file The image file
* @param requestedWidth The requested width
* @param requestedHeight The requested height
* @return The decoded bitmap or null if it is not possible to decode the file parameter
*/
public static Bitmap decodeImageFileIntoMutableBitmap(Context context, File file, int requestedWidth, int requestedHeight) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true; // just compute size, don't create bitmap
BitmapFactory.decodeFile(file.getAbsolutePath(), options);
float sampleSize = computeImageScaleCoefficient(options, requestedWidth, requestedHeight);
if (sampleSize == -1) {
return null;
}
else if (sampleSize <= 1) {
options.inSampleSize = 1;
}
else {
options.inSampleSize = (int) sampleSize;
}
options.inJustDecodeBounds = false; // compute size and create bitmap
/*it is possible to reduce the memory when decoding through skipping ARGB_8888 and using RGB_565 instead and inDither to true to preserve image quality.*/
//options.inPreferredConfig = Bitmap.Config.RGB_565;
//options.inDither = true;
Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
if (bitmap == null) {
return null;
}
return bitmap;
}
/**
* Find the sample coefficient <code><b>s<sub>k</sub></b>=2<sup>k</sup></code>, with <code>k &isin ℕ</code>, such that
* <code>min<sub>k</sub>(requestedWidth-options.outWidth×<b>s<sub>k</sub></b>)>0</code>
* <code>&&</code>
* <code>min<sub>k</sub>(requestedHeight-options.outHeight×<b>s<sub>k</sub></b>)>0</code>
* @param options The BitmapFactory.Options instance of the original image user wants to scale
* @param requestedWidth The requested width
* @param requestedHeight The requested height
* @return -1 if if there is an error trying to decode the image
* or the sample coefficient <code><b>s<sub>k</sub></b></code>,
* >1 if the image needs to be down-sampled,
* <1 if the image needs to be up-sampled
*/
public static float computeImageScaleCoefficient(BitmapFactory.Options options, int requestedWidth, int requestedHeight) {
float sampleCoefficient = 1;
int imageWidth = options.outWidth;
int imageHeight = options.outHeight;
if (imageWidth == -1 || imageHeight == -1) {
return -1;
}
double outWidth = imageWidth;
double outHeight = imageHeight;
if ((outWidth > requestedWidth) || (outHeight > requestedHeight)) {
while ((outWidth > requestedWidth) || (outHeight > requestedHeight)) {
outWidth = Math.floor(outWidth/2.0);
outHeight = Math.floor(outHeight/2.0);
sampleCoefficient *= 2.0;
}
}
else {
while ((outWidth < requestedWidth) && (outHeight < requestedHeight)) {
outWidth *= 2;
outHeight *= 2;
if ((outWidth <= requestedWidth) && (outHeight <= requestedHeight)) {
sampleCoefficient /= 2.0;
}
}
}
return sampleCoefficient;
}
#6
4
Just increase the heap size of your application in manifest file.
只需要在manifest文件中增加应用程序的堆大小。
android:largeHeap="true"
eg:
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/Theme.AppTheme"
android:largeHeap="true" >
#7
2
You can try this, it should solve your problem.
你可以试试这个，它可以解决你的问题。
Basically first saving the data to a file, using a buffer to avoid memory problems. After that we check and resize the file - loading directly a resized Bitmap, again to avoid memory problems.
首先将数据保存到文件中，使用缓冲区来避免内存问题。在此之后，我们检查和调整文件的大小，直接加载一个大小调整的位图，以避免内存问题。
From what I can suppose, you are getting the encoded string from a server... so you can manage your code to directly write to the file.
根据我的推测，您是从服务器获取编码字符串…因此，您可以管理您的代码直接写入文件。
Writing the data to the file:
将数据写入文件:
private Bitmap getBitmapThumbnail(String base64StringReceive) {
byte[] data = Base64.decode(base64StringReceive, Base64.DEFAULT);
File file = new File(getFilesDir(), "testFile");
try {
BufferedOutputStream bos = new BufferedOutputStream(openFileOutput("testFile", Context.MODE_PRIVATE),1024);
bos.write(data);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return getThumbFromFile(file, false);
}
Creating the thumbnail from the image file:
从图像文件创建缩略图:
private Bitmap getThumbFromFile(File file) {
Bitmap tempImage = null;
try {
tempImage = decodeSampledBitmapFromFile(file.getAbsolutePath(), 50, 50); // this is in pixels - use your desired size
return ThumbnailUtils.extractThumbnail(tempImage, 50, 50);
} finally {
if (tempImage != null) {
tempImage.recycle();
}
}
}
Loading only a resized Bitmap:
只加载一个缩放的位图:
private Bitmap decodeSampledBitmapFromFile(String filePath, int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(filePath, options);
}
Calculating the sampling value - provided by Google, you can find it their tutorials:
计算谷歌提供的抽样值，你可以找到他们的教程:
private int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight &&
(halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}