今天做图库图片的裁剪遇到了不少坑，今天记录一下，以下坑位供各位看官参考；
如果有不对之处，欢迎各位看官留言评论！
图片裁剪踩坑锦囊：
问题一：相册裁剪权限问题
解：这个简单，对于Android6.0以上的手机需要进行动态权限的申请：
1>AndroidManifest.xml文件中添加
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
2>调用之前动态申请
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
"android.permission.READ_EXTERNAL_STORAGE",
"android.permission.WRITE_EXTERNAL_STORAGE"}; /**
* 打开相册
*/
private void openPhotoAlbum(int requestCode) { if (hasPermission()) {
ChoosePicUtil.getInstance().choosePic(getContext(), requestCode);
}
} private boolean hasPermission() { try {
//检测是否有写的权限
int permission = ActivityCompat.checkSelfPermission(getActivity(),
"android.permission.WRITE_EXTERNAL_STORAGE");
if (permission != PackageManager.PERMISSION_GRANTED) {
// 没有写的权限，去申请写的权限，会弹出对话框
ActivityCompat.requestPermissions(getActivity(), PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE);
} else {
return true;
}
} catch (Exception e) {
e.printStackTrace();
} return false;
}
问题2：android android.system.ErrnoException: open failed: ENOENT (No such file or directory)
对于Android 7 以上的设备加强了文件权限的管理，需要使用FileProvider获取文件（此处是原图片）的uri，值得一提的是如果不使用FileProvider,debug包虽然没有不会crash,但是release包必crash,所以各位看官记得测一测release包。
解决：使用FileProvider:
1>AndroidManifest.xml中配置
<provider
android:authorities="包名.fileProvider"
android:name="android.support.v4.content.FileProvider"
android:grantUriPermissions="true"
android:exported="false">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths"
/>
</provider>
2>在res文件夹中创建xml文件夹，创建file_paths.xml
可以根据自己的图片存储选择对应的path标签，当然，如过不确定，也可以全部选择。
<paths>
<!-- 物理路径为Context.getFilesDir() + /files/* -->
<files-path path="files" name="files" />
<!-- 物理路径为Context.getCacheDir() + /files/* -->
<cache-path path="files" name="cache" />
<!-- 物理路径为Environment.getExternalStorageDirectory() + /files/* -->
<external-path path="files" name="external" />
<!-- 物理路径为Context.getExternalFilesDir(String) + /files/* -->
<external-files-path path="files" name="externalfiles"/>
<!-- 物理路径为Context.getExternalCacheDir() + /files/* -->
<external-cache-path path="files" name="externalcache"/>
<!-- 物理路径为`Context.getExternalMediaDirs() + /files/*, 要求API21+ -->
<external-media-path name="externalmedia" path="files" />
</paths>
注意：如果图片存储路径与我们选择的path标签不一致就会报错，可以根据报错日志找到对应图片存储路径，选择正确的标签。
3>使用FileProvider
FileProvider.getUriForFile(context, "包名.fileProvider", file) //file: 我们创建的原图片文件
//注意intent跳转时版本大于N时添加权限
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
注意：
这里的包名一定要和AndroidManifest中的包名一致且，如果是组件式开发，建议放在主app module的包中，避免包名不一致问题。
问题3:裁剪后提示“无法保存裁剪后的图片”
存在以下几种可能
1:图片存储路径问题
2.对于部分机型图片太大会产生该问题，通过设置setOutputX/Y()小一点
3.裁剪后的图片file的uri不能是使用FileProvider生成的uri,即检查一下 imageCropUri
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageCropUri);
源代码如下：
//图片选取工具类
public class ChoosePicUtil {
public static final int CHOOSE_BG_PICTURE_CODE = 1;
public static final int CHOOSE_COVER_PICTURE_CODE = 2;
public static final int CODE_CAMERA_CROP_1_1_REQUEST = 3;
public static final int CODE_CAMERA_CROP_9_16_REQUEST = 4;
private PickParams mPickParams;
private static ChoosePicUtil mInstance;
public static ChoosePicUtil getInstance() {
if (mInstance == null) {
mInstance = new ChoosePicUtil();
}
return mInstance;
}
public ChoosePicUtil buildPickParams(PickParams params) {
mPickParams = params;
return this;
}
/**
* 裁剪图片
*
* @param uri
*/
public void cropImg(Context context, Uri uri, Uri imageCropUri, int requestCode) {
Intent intent = new Intent("com.android.camera.action.CROP"); //调用裁剪
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
}
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
if (mPickParams == null) {
mPickParams = new PickParams();
}
intent.putExtra("aspectX", mPickParams.aspectX); //设置宽高比例
intent.putExtra("aspectY", mPickParams.aspectY);
intent.putExtra("outputX", mPickParams.outputX); //设置裁剪图片宽高
intent.putExtra("outputY", mPickParams.outputY);
intent.putExtra("return-data", false);
intent.putExtra("scale", true);
intent.putExtra("scaleUpIfNeeded", true); //防止出现黑边框
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageCropUri);
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString()); //设置输出格式
intent.putExtra("noFaceDetection", true);
if (context instanceof Activity) {
((Activity) context).startActivityForResult(intent, requestCode);
}
}
/**
* 选取图片
* @param context
*/
public void choosePic(Context context, int requestCode) {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
if (context instanceof Activity) {
((Activity) context).startActivityForResult(intent, requestCode);
}
}
/**
* 该方法为了适配小米手机裁剪
* 将file://的uri转换为content的content:// 的uri;
* @param context
* @return
*/
public static Uri getImageUri(Context context,Intent data){
String imagePath = null;
Uri uri = data.getData();
if(Build.VERSION.SDK_INT >= 19){
if(DocumentsContract.isDocumentUri(context,uri)){
String docId = DocumentsContract.getDocumentId(uri);
if("com.android.providers.media.documents".equals(uri.getAuthority())){
String id = docId.split(":")[1];
String selection = MediaStore.Images.Media._ID+"="+id;
imagePath = getImagePath(context,MediaStore.Images.Media.EXTERNAL_CONTENT_URI,selection);
}else if("com.android.providers.downloads.documents".equals(uri.getAuthority())){
Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),Long.valueOf(docId));
imagePath = getImagePath(context,contentUri,null);
}
}else if("content".equalsIgnoreCase(uri.getScheme())){
imagePath = getImagePath(context,uri,null);
}else if("file".equalsIgnoreCase(uri.getScheme())){
imagePath = uri.getPath();
}
}else{
uri= data.getData();
imagePath = getImagePath(context,uri,null);
}
File file = new File(imagePath);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
return FileProvider.getUriForFile(context, "io.liuliu.music.fileProvider", file);
} else {
return Uri.fromFile(file);
}
}
private static String getImagePath(Context context,Uri uri, String selection) {
String path = null;
Cursor cursor = context.getContentResolver().query(uri,null,selection,null,null);
if(cursor != null){
if(cursor.moveToFirst()){
path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
}
cursor.close();
}
return path;
}
public static class PickParams {
private int outputX = 300;
private int outputY = 300;
private int aspectX = 1;
private int aspectY = 1;
public PickParams() {
}
public int getOutputX() {
return outputX;
}
public PickParams setOutputX(int outputX) {
this.outputX = outputX;
return this;
}
public int getOutputY() {
return outputY;
}
public PickParams setOutputY(int outputY) {
this.outputY = outputY;
return this;
}
public int getAspectX() {
return aspectX;
}
public PickParams setAspectX(int aspectX) {
this.aspectX = aspectX;
return this;
}
public int getAspectY() {
return aspectY;
}
public PickParams setAspectY(int aspectY) {
this.aspectY = aspectY;
return this;
}
}
}
//接收图片返回结果
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (data == null) {
return;
}
if (requestCode == CHOOSE_BG_PICTURE_CODE) { Uri uri = ChoosePicUtil.getImageUri(this, data);
//375 * 900 太大了,部分手机不支持 ChoosePicUtil.PickParams params =
new ChoosePicUtil.PickParams()
.setAspectX(9)
.setAspectY(16)
.setOutputX(270)
.setOutputY(480); imageCropUri = getImageCropUri(CHOOSE_BG_PICTURE_CODE); ChoosePicUtil.getInstance()
.buildPickParams(params)
.cropImg(this, uri, imageCropUri, ChoosePicUtil.CODE_CAMERA_CROP_9_16_REQUEST);
} else if (requestCode == CHOOSE_COVER_PICTURE_CODE) { Uri uri = ChoosePicUtil.getImageUri(this, data); imageCropUri = getImageCropUri(CHOOSE_COVER_PICTURE_CODE); ChoosePicUtil.PickParams params =
new ChoosePicUtil.PickParams()
.setAspectX(1)
.setAspectY(1)
.setOutputX(300)
.setOutputY(300); ChoosePicUtil.getInstance()
.buildPickParams(params)
.cropImg(this, uri, imageCropUri, ChoosePicUtil.CODE_CAMERA_CROP_1_1_REQUEST);
} else if (requestCode == ChoosePicUtil.CODE_CAMERA_CROP_9_16_REQUEST) {
if (imageCropUri != null) {
//do what you want
}
} else if (requestCode == ChoosePicUtil.CODE_CAMERA_CROP_1_1_REQUEST) {
if (imageCropUri != null) {
//do what you want
}
} }