撕衣服案例

public class MainActivity extends AppCompatActivity {    private ImageView iv;    @SuppressLint("ClickableViewAccessibility")    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        iv = findViewById(R.id.iv);        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.pre19);        final Bitmap bitmap1 = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), bitmap.getConfig());        Paint paint = new Paint();        final Canvas canvas = new Canvas(bitmap1);        canvas.drawBitmap(bitmap, new Matrix(), paint);        iv.setImageBitmap(bitmap1);        iv.setOnTouchListener(new View.OnTouchListener() {            @Override            public boolean onTouch(View v, MotionEvent event) {                int action = event.getAction();                switch (action) {                    case MotionEvent.ACTION_MOVE:                        for (int i = 0; i < 20; i++) {                            for (int j = 0; j < 20; j++) {                                try {                                    bitmap1.setPixel((int) event.getX() + i, (int) event.getY() + j, Color.TRANSPARENT);                                } catch (Exception e) {                                    e.printStackTrace();                                }                            }                        }                        iv.setImageBitmap(bitmap1);                }                return true;            }        });    }}