博文转自http://blog.csdn.net/zhaokaidong3/article/details/7776238，
另外要补充的是：不同的图片读取像素可能不同，要根据自己需要的像素进行提取，因此函数 private byte[] addBMP_RGB_888(int[] b,int w, int h)需要更改。注意，调色表可有可无，以下代码中没有调色表。
一般来说bmp图片由14byte 头文件+40byte信息头+1024调色表+像素点组成。
package com.test.bitmap;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class Mainactivity extends Activity {
ImageView img;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn = (Button) findViewById(R.id.sd);
img = (ImageView) findViewById(R.id.img1);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
View view = v.getRootView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bitmap = view.getDrawingCache();
if (bitmap != null) {
// ByteArrayOutputStream bos = new ByteArrayOutputStream();
// bitmap.compress(CompressFormat.PNG, 90, bos); 只能转成PNG、JPEG
// byte[] data = bos.toByteArray();
// img.setImageBitmap(BitmapFactory.decodeByteArray(data, 0,
// data.length));
int w = bitmap.getWidth(), h = bitmap.getHeight();
int[] pixels=new int[w*h];
bitmap.getPixels(pixels, 0, w, 0, 0, w, h);
// ByteBuffer dst = ByteBuffer.allocate(bitmap.getRowBytes()
// * h);
// bitmap.copyPixelsToBuffer(dst);
// IntBuffer dst=IntBuffer.allocate(w*h);
// bitmap.copyPixelsToBuffer(dst);
byte[] rgb = addBMP_RGB_888(pixels,w,h);
byte[] header = addBMPImageHeader(rgb.length);
byte[] infos = addBMPImageInfosHeader(w, h);
byte[] buffer = new byte[54 + rgb.length];
System.arraycopy(header, 0, buffer, 0, header.length);
System.arraycopy(infos, 0, buffer, 14, infos.length);
System.arraycopy(rgb, 0, buffer, 54, rgb.length);
try {
FileOutputStream fos = new FileOutputStream(Environment
.getExternalStorageDirectory().getPath()
+ "/hello.bmp");
fos.write(buffer);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
}
//BMP文件头
private byte[] addBMPImageHeader(int size) {
byte[] buffer = new byte[14];
buffer[0] = 0x42;
buffer[1] = 0x4D;
buffer[2] = (byte) (size >> 0);
buffer[3] = (byte) (size >> 8);
buffer[4] = (byte) (size >> 16);
buffer[5] = (byte) (size >> 24);
buffer[6] = 0x00;
buffer[7] = 0x00;
buffer[8] = 0x00;
buffer[9] = 0x00;
buffer[10] = 0x36;
buffer[11] = 0x00;
buffer[12] = 0x00;
buffer[13] = 0x00;
return buffer;
}
//BMP文件信息头
private byte[] addBMPImageInfosHeader(int w, int h) {
byte[] buffer = new byte[40];
buffer[0] = 0x28;
buffer[1] = 0x00;
buffer[2] = 0x00;
buffer[3] = 0x00;
buffer[4] = (byte) (w >> 0);
buffer[5] = (byte) (w >> 8);
buffer[6] = (byte) (w >> 16);
buffer[7] = (byte) (w >> 24);
buffer[8] = (byte) (h >> 0);
buffer[9] = (byte) (h >> 8);
buffer[10] = (byte) (h >> 16);
buffer[11] = (byte) (h >> 24);
buffer[12] = 0x01;
buffer[13] = 0x00;
buffer[14] = 0x18;
buffer[15] = 0x00;
buffer[16] = 0x00;
buffer[17] = 0x00;
buffer[18] = 0x00;
buffer[19] = 0x00;
buffer[20] = 0x00;
buffer[21] = 0x00;
buffer[22] = 0x00;
buffer[23] = 0x00;
buffer[24] = (byte) 0xE0;
buffer[25] = 0x01;
buffer[26] = 0x00;
buffer[27] = 0x00;
buffer[28] = 0x02;
buffer[29] = 0x03;
buffer[30] = 0x00;
buffer[31] = 0x00;
buffer[32] = 0x00;
buffer[33] = 0x00;
buffer[34] = 0x00;
buffer[35] = 0x00;
buffer[36] = 0x00;
buffer[37] = 0x00;
buffer[38] = 0x00;
buffer[39] = 0x00;
return buffer;
}
private byte[] addBMP_RGB_888(int[] b,int w, int h) {
int len = b.length;
System.out.println(b.length);
byte[] buffer = new byte[w*h * 3];
int offset=0;
for (int i = len-1; i>=w; i-=w) {
//DIB文件格式最后一行为第一行，每行按从左到右顺序
int end=i,start=i-w+1;
for(int j=start;j<=end;j++){
buffer[offset]=(byte)(b[j]>>0);
buffer[offset+1]=(byte)(b[j]>>8);
buffer[offset+2]=(byte)(b[j]>>16);
offset += 3;
}
}
return buffer;
}
}