剪切图片为原形

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ImageView imageView = findViewById( R.id.image1 );
        ViewOutlineProvider viewOutlineProvider = new ViewOutlineProvider() {
            @Override
            public void getOutline(View view, Outline outline) {
                outline.setRoundRect(0, 0,50, 50,30);
            }
        };

        imageView.setOutlineProvider(viewOutlineProvider);
        imageView.setClipToOutline(true);
    }

}