gesturedetector

当用户触摸屏幕的时候，会产生许多手势，例如 down ， up ， scroll ， filing 等等。 一般情况下，我们知道 View 类有个 View.OnTouchListener 内部接口，通过重写他的 onTouch(View v, MotionEvent event) 方法，我们可以处理一些 touch 事件，但是这个方法太过简单，如果需要处理一些复杂的手势，用这个接口就会很麻烦（因为我们要自己根据用户触摸的轨迹去判断是什么手势）。 Android sdk 给我们提供了 GestureDetector （ Gesture ：手势 Detector ：识别）类，通过这个类我们可以识别很多的手势，主要是通过他的 onTouchEvent(event) 方法完成了不同手势的识别。虽然他能识别手势，但是不同的手势要怎么处理，应该是提供给程序员实现的。 GestureDetector 这个类对外提供了两个接口： OnGestureListener ， OnDoubleTapListener ，还有一个内部类 SimpleOnGestureListener 。 GestureDetector.OnDoubleTapListener 接口 ：用来通知 DoubleTap 事件，类似于鼠标的双击事件。 1 ， onDoubleTap(MotionEvent e) ：在 双击的第二下

I have a custom view on which I want to set long click listener. I am using following code to set the same. final GestureDetector gestureDetector = (new GestureDetector(new GestureDetector.SimpleOnGestureListener() { public void onLongPress(MotionEvent e) { Log.e("test", "Long press detected"); } })); public boolean onTouchEvent(MotionEvent event) { return gestureDetector.onTouchEvent(event); } The problem is on all gestures whether it is a single tap, double tap onLongPress is getting called. I can get the code to working by implementing onDown() method but why this is not working when it is

public class GameActivity extends Activity { private static final String TAG = "GameActivity"; . . . @Override public boolean onTouchEvent(MotionEvent event) { Log.d(TAG, "+ onTouchEvent(event:" + event + ")"); Log.d(TAG, "- onTouchEvent()"); return super.onTouchEvent(event); } . . . } public class GameView extends SurfaceView implements SurfaceHolder.Callback { private static final String TAG = "GameView"; . . . @Override public boolean onTouchEvent(MotionEvent event) { Log.d(TAG, "+ onTouchEvent(event:" + event + ")"); gestureDetector.onTouchEvent(event); Log.d(TAG, "- onTouchEvent()");

More specific where do I attach OnGestureListener so that I can detect onSingleTapUp everywhere on the screen, even if an ImageView take up half the screen. Now I have the Listener on the Activity that has an ImageView. But the Listener only fire when I click outside the ImageView. I read and try to understand this but cannot get it right. this code is in the Activity. public boolean onSingleTapUp(MotionEvent e) { //addtext.setText("-" + "SINGLE TAP UP" + "-"); //Log.d(TAG, "- + SINGLE TAP UP + - ***********************************************************************"); int btnsize =

I have this code so far in my Activity: private class SwipeGestureDetector extends SimpleOnGestureListener { // Swipe properties, you can change it to make the swipe // longer or shorter and speed private static final int SWIPE_MIN_DISTANCE = 120; private static final int SWIPE_MAX_OFF_PATH = 200; private static final int SWIPE_THRESHOLD_VELOCITY = 200; @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { try { float diffAbs = Math.abs(e1.getY() - e2.getY()); float diff = e1.getX() - e2.getX(); Log.d("MainDisplayActivity", "Gesture class is