Android、DragListener 结合 Single Tap 或 OnClick/OnTouch

Question

我正在努力将 DragListener 与 ImageView 中的 SingeTap 操作结合起来。它们单独工作正常，但是这两者应该如何结合呢？

imageView.setOnTouchListener(new OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    switch(event.getAction()) {
                        case MotionEvent.ACTION_UP:
                            Log.e("SINGLE TAP","?");
                            break;
                        case MotionEvent.ACTION_MOVE:
                            ClipData data = ClipData.newPlainText("TRYING", "");
                            DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(v);
                            v.startDrag(data, shadowBuilder, v, 0);
                            break;
                        default: break;
                    }
                    return false;
                }
            });

似乎仍然无法正常工作。如何做到这一点？

Answer 1

ACTION_UP 将在拖动事件完成后以及点击事件完成后被调用。因此，您应该有一个标志来检测是否发生了拖动事件。这是一个例子

imageView.setOnTouchListener(new OnTouchListener() {
            private boolean isDrag = false;

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch(event.getAction()) {
                    case MotionEvent.ACTION_UP:
                        if (!isDrag) {
                            // action was a single tap
                        }
                        isDrag = false; // reset the flag
                        break;
                    case MotionEvent.ACTION_MOVE:
                        isDrag = true; // set the flag
                        ClipData data = ClipData.newPlainText("TRYING", "");
                        DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(v);
                        v.startDrag(data, shadowBuilder, v, 0);
                        break;
                    default: break;
                }
                return false;
            }
        });