Question

编辑：现在发布整个班级，而不仅仅是内部自定义监听器

几个星期以来，我一直把这个问题记在脑海里，仍然没有答案。我想制作一个“照片视图活动”，用户可以在整个屏幕上看到照片。用户必须能够双击缩放，捏合缩放以及能够在向左/向右滑动时退出活动。现在我能够做到以下几点：滑动退出捏/双击缩放（Photo attacher）

但是，如果我尝试同时使用两者，系统会认为我正在尝试缩放并且不会触发滑动的侦听器。因为照片附件很简单，所以这里有一些滑动部分的代码：内在的类

public class PhotoShowActivity extends Activity{
//  Toolbar bar;
PhotoView photoToShow;
PhotoViewAttacher attacher = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_photo_show);
    //set up bar
   // bar = (Toolbar) findViewById(R.id.toolbar_with_back_key);
  //  bar.setTitle("");
    //setSupportActionBar(bar);
   // getSupportActionBar().setDisplayHomeAsUpEnabled(true);
  //  getSupportActionBar().setDisplayShowHomeEnabled(true);
    photoToShow = (PhotoView) findViewById(R.id.photo_show);
    Intent i = getIntent();
    try
    {
        File receive = (File) i.getSerializableExtra("image");
     //  getSupportActionBar().setTitle(i.getStringExtra("title"));
        Glide.with(this).load(receive).into(photoToShow);


    }catch(Exception e){finish();}
    attacher = new PhotoViewAttacher(photoToShow);
    photoToShow.setOnTouchListener(new OnSwipeTouchListener(PhotoShowActivity.this)
    {
        public void onSwipeRight() {
            PhotoShowActivity.this.finish();
        }
        public void onSwipeLeft() {
                    PhotoShowActivity.this.finish();
        }
        public void onSwipeTop() {
            //       PhotoShowActivity.this.finish();
        }
        public void onSwipeBottom() {
            //      PhotoShowActivity.this.finish();
        }
    });

}

public class OnSwipeTouchListener implements View.OnTouchListener {

    private final GestureDetector gestureDetector;

    public OnSwipeTouchListener (Context ctx){
        gestureDetector = new GestureDetector(ctx, new GestureListener());
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {

        if (attacher.getScale() == 1.0) {
            gestureDetector.onTouchEvent(event);
        }
        return true;
    }

    private final class GestureListener extends GestureDetector.SimpleOnGestureListener {

        private static final int SWIPE_THRESHOLD = 100;
        private static final int SWIPE_VELOCITY_THRESHOLD = 100;

        @Override
        public boolean onDown(MotionEvent e) {
            return true;
        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            boolean result = false;
            try {
                float diffY = e2.getY() - e1.getY();
                float diffX = e2.getX() - e1.getX();
                if (Math.abs(diffX) > Math.abs(diffY)) {
                    if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                        if (diffX > 0) {
                            onSwipeRight();
                        } else {
                            onSwipeLeft();
                        }
                        result = true;
                    }
                }
                else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffY > 0) {
                        onSwipeBottom();
                    } else {
                        onSwipeTop();
                    }
                    result = true;
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
            return result;
        }
    }

    public void onSwipeRight() {
    }

    public void onSwipeLeft() {
    }

    public void onSwipeTop() {
    }

    public void onSwipeBottom() {
    }
}

}

这里我们将侦听器绑定到图像视图

imageView.setOnTouchListener(new OnSwipeTouchListener(PhotoShowActivity.this){
        public void onSwipeRight() {
            PhotoShowActivity.this.finish();
        }
        public void onSwipeLeft() {
                    PhotoShowActivity.this.finish();
        }
        public void onSwipeTop() {
            //       PhotoShowActivity.this.finish();
        }
        public void onSwipeBottom() {
            //      PhotoShowActivity.this.finish();
        }
    });

关于如何组合缩放和滑动的任何想法？

Answer 1

您需要做的就是检查ImageView是否被缩放。如果它已放大，则滑动左右功能不起作用。 PhotoView库提供了检查ImageView缩放级别的功能。我遇到了同样的问题，我已经想通了。您可以在下面找到以下代码段作为参考，

   @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {
        if (imgPdfView.getCurrentZoom() == 1) {
            mGestureDetector.onTouchEvent(motionEvent);
        }
        return true;
    }

如果imgPdfView.getCurrentZoom()==1，则表示您的ImageView处于正常状态。因此，现在您可以向左滑动或向右滑动以获得更多功能。

捏缩放，双击缩放+滑动手势

1 个答案: