Android使用PhotoView实现图片双击放大单击退出效果

public class MainActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    PhotoView pv = (PhotoView) findViewById(R.id.pv);
    pv.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener() {
      @Override
      public void onPhotoTap(View view, float v, float v1) {
        finish();
      }
    });
  }
}