Bitmap图片的读取和保存 compress BitmapFactory

 Bitmap decodeFile = BitmapFactory.decodeFile("/mnt/sdcard/1.png");
    
    iv.setImageBitmap(decodeFile);
    
    try {
        decodeFile.compress(CompressFormat.JPEG, 100, openFileOutput("2.png", MODE_PRIVATE));
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }