android - 如何在 android 中扰乱图像(图像处理)？

Question

我一直在尝试在图像上实现这一点 -

在点击列表中的一个项目时被称为Scrambled Image。

问题是我无法实现这一点，我得到的是旧图像的非扰乱图像。

这是我的主要 Activity 代码:

public class MainActivity extends AppCompatActivity {

static final String CAMERA_PIC_DIR = "/DCIM/Camera/";
ImageView iv;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    iv = (ImageView) findViewById(R.id.my_image);
    String ImageDir = Environment.getExternalStorageDirectory()
            .getAbsolutePath() + CAMERA_PIC_DIR;
    Intent i = new Intent(this, ListFiles.class);
    i.putExtra("directory", ImageDir );
            startActivityForResult(i,0);
}
@Override
protected void onActivityResult(int requestCode,
                                int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == 0 && resultCode==RESULT_OK) {
        String tmp = data.getExtras().getString("clickedFile");
        Bitmap ImageToChange= BitmapFactory.decodeFile(tmp);
        process_image(ImageToChange);
    }
}
void process_image(Bitmap image) {
    Bitmap bm = Bitmap.createScaledBitmap(image, 480, 320, false);
    int width = bm.getWidth();
    int height = bm.getHeight();
    int x= width>>1;
    int y= height>>1;
    int[] pixels1 = new int[(width*height)];
    int[] pixels2 = new int[(width*height)];
    int[] pixels3 = new int[(width*height)];
    int[] pixels4 = new int[(width*height)];
    bm.getPixels(pixels1, 0, width, 0, 0, width>>1, height>>1);
    bm.getPixels(pixels2, 0, width, x, 0, width>>1, height>>1);
    bm.getPixels(pixels3, 0, width, 0, y, width>>1, height>>1);
    bm.getPixels(pixels4, 0, width, x, y, width>>1, height>>1);
    if(bm.isRecycled()) {
        bm.setPixels(pixels2, 0, width, 0, 0, width>>1, height>>1);
        bm.setPixels(pixels4, 0, width, x, 0, width>>1, height>>1);
        bm.setPixels(pixels1, 0, width, 0, y, width>>1, height>>1);
        bm.setPixels(pixels3, 0, width, x, y, width>>1, height>>1);
    }
    iv.setImageBitmap(bm);
}
}

任何积极的回答将不胜感激。

提前感谢您的帮助!

Answer 1

您可以将 if(isRecycled()) 替换为 if(isMutable())

这应该可以解决问题!