android - 从安卓手机的角落和边缘滑动

Question

我必须实现滑动监听器，以便它可以监听来自 Android 设备角落或边缘的滑动。我已经实现了覆盖方法 onTouchEvent(MotionEvent event) 来获取边缘标志。但边缘标志的值始终设置为零。我的问题是如何聆听来自设备角落或边缘的滑动。

提前致谢。

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN
            && (event.getEdgeFlags() == MotionEvent.EDGE_RIGHT) || event.getEdgeFlags() == MotionEvent.EDGE_LEFT) {
            mOverlayLayout.setVisibility(View.VISIBLE);
            return true;
        } else if (event.getFlags() == MotionEvent.FLAG_WINDOW_IS_OBSCURED) {
            mOverlayLayout.setVisibility(View.INVISIBLE);
            return true;
        }
        return false;
    }

Answer 1

您可以创建 OnSwipeTouchListener.java

    import android.view.GestureDetector;
       import android.view.GestureDetector.SimpleOnGestureListener;
       import android.view.MotionEvent;
       import android.view.View;
       import android.view.View.OnTouchListener;

   public class OnSwipeTouchListener implements OnTouchListener {

   private final GestureDetector gestureDetector;

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

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        return gestureDetector.onTouchEvent(event);
    }

    private final class GestureListener extends 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() {
    }
}

用法:

imageView.setOnTouchListener(new OnSwipeTouchListener(MyActivity.this) {
public void onSwipeTop() {
    Toast.makeText(MyActivity.this, "top", Toast.LENGTH_SHORT).show();
}
public void onSwipeRight() {
    Toast.makeText(MyActivity.this, "right", Toast.LENGTH_SHORT).show();
}
public void onSwipeLeft() {
    Toast.makeText(MyActivity.this, "left", Toast.LENGTH_SHORT).show();
}
public void onSwipeBottom() {
    Toast.makeText(MyActivity.this, "bottom", Toast.LENGTH_SHORT).show();
}

});

引用:https://stackoverflow.com/a/12938787/7199177