GestureDetector
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探测当前用户各种不同的操作手势,通过 GestureDetector.OnGestureListener callback来获取当前被触发的操作手势(Single Tap Up、Show Press、Long Press、Scroll、Down、Fling)。
使用方法:
01.private GestureDetector mGestureDetector;
02.@Override
03.public void onCreate(Bundle savedInstanceState) {
04. super.onCreate(savedInstanceState);
05. mGestureDetector = new GestureDetector(this, new LearnGestureListener());
06.}
07.@Override
08.public boolean onTouchEvent(MotionEvent event) {
09. if (mGestureDetector.onTouchEvent(event))
10. return true;
11. else
12. return false;
13.}
14.class LearnGestureListener extends GestureDetector.SimpleOnGestureListener{
15. @Override
16. public boolean onSingleTapUp(MotionEvent ev) {
17. Log.d("onSingleTapUp",ev.toString());
18. return true;
19. }
20. @Override
21. public void onShowPress(MotionEvent ev) {
22. Log.d("onShowPress",ev.toString());
23. }
24. @Override
25. public void onLongPress(MotionEvent ev) {
26. Log.d("onLongPress",ev.toString());
27. }
28. @Override
29. public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
30. Log.d("onScroll",e1.toString());
31. return true;
32. }
33. @Override
34. public boolean onDown(MotionEvent ev) {
35. Log.d("onDownd",ev.toString());
36. return true;
37. }
38. @Override
39. public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
40. Log.d("d",e1.toString());
41. Log.d("e2",e2.toString());
42. return true;
43. }
44.}
说明:
在当前类中创建一个GestureDetector实例。
1.private GestureDetector mGestureDetector;
创建一个Listener来实时监听当前面板操作手势。
1.class LearnGestureListener extends GestureDetector.SimpleOnGestureListener
在初始化时,将Listener实例关联当前的GestureDetector实例。
1.mGestureDetector = new GestureDetector(this, new LearnGestureListener());
利用onTouchEvent方法作为入口检测,通过传递MotionEvent参数来监听操作手势。
1.mGestureDetector.onTouchEvent(event)
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