代码如下：

public class ReadBitmap {
public void readByte(Context c, String name, int indexInt) {
byte[] b = null;
int[] intArrat = c.getResources().getIntArray(indexInt);
try {
AssetManager am = null;
am = c.getAssets();
InputStream is = am.open(name);
for (int i = 0; i < intArrat.length; i++) {
b = new byte[intArrat[i]];
// 读取数据
is.read(b);
saveMyBitmap(Bytes2Bimap(b), MainActivity.DIR+name+i+".jpg");
}
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public static Bitmap Bytes2Bimap(byte[] b) {
if (b.length != 0) {
return BitmapFactory.decodeByteArray(b, 0, b.length);
} else {
return null;
}
}

public static boolean saveMyBitmap(Bitmap bmp, String path) {
File f = new File(path);
try {
f.createNewFile();
FileOutputStream fOut = new FileOutputStream(f);
bmp.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
fOut.flush();
fOut.close();
return true;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return false;
}
}