android – MyGestureDetector扩展了SimpleOnGestureListener

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我正在实现一个扩展SimpleOnGestureListener的MyGestureDetector.我从 http://www.codeshogun.com/blog/tag/view-flipper/借用了这个类,允许在ViewFlipper中进行滑动操作.我无法在模拟器上运行.有什么建议?

以下是所有代码

main.java

  1. import android.app.Activity;
  2. import android.os.Bundle;
  3. import android.view.GestureDetector;
  4. import android.view.KeyEvent;
  5. import android.view.MotionEvent;import android.view.View;
  6. import android.view.GestureDetector.SimpleOnGestureListener;
  7. import android.view.animation.Animation;
  8. import android.view.animation.AnimationUtils;
  9. import android.webkit.WebView;
  10. import android.widget.ViewFlipper;
  11.  
  12.  
  13. public class main extends Activity {
  14.  
  15. private static final int SWIPE_MIN_DISTANCE = 120;
  16. private static final int SWIPE_MAX_OFF_PATH = 250;
  17. private static final int SWIPE_THRESHOLD_VELOCITY = 200;
  18. private GestureDetector gestureDetector;
  19. View.OnTouchListener gestureListener;
  20. private Animation slideLeftIn;
  21. private Animation slideLeftOut;
  22. private Animation slideRightIn;
  23. private Animation slideRightOut;
  24. private ViewFlipper viewFlipper;
  25.  
  26. @Override
  27. public void onCreate(Bundle savedInstanceState) {
  28. super.onCreate(savedInstanceState);
  29. setContentView(R.layout.main);
  30.  
  31. // ---------------------------------Sets Swipe Animation to Next View -->
  32. viewFlipper = (ViewFlipper)findViewById(R.id.AC4313);
  33. slideLeftIn = AnimationUtils.loadAnimation(this,R.anim.slide_left_in);
  34. slideLeftOut = AnimationUtils.loadAnimation(this,R.anim.slide_left_out);
  35. slideRightIn = AnimationUtils.loadAnimation(this,R.anim.slide_right_in);
  36. slideRightOut = AnimationUtils.loadAnimation(this,R.anim.slide_right_out);
  37.  
  38. gestureDetector = new GestureDetector(new MyGestureDetector());
  39. gestureListener = new View.OnTouchListener() {
  40. public boolean onTouch(View v,MotionEvent event) {
  41. if (gestureDetector.onTouchEvent(event)) {
  42. return true;
  43. }
  44. return false;
  45. }
  46. };
  47. }
  48.  
  49. class MyGestureDetector extends SimpleOnGestureListener {
  50. @Override
  51. public boolean onFling(MotionEvent e1,MotionEvent e2,float velocityX,float velocityY) {
  52. try {
  53. if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
  54. return false;
  55. // right to left swipe
  56. if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
  57. viewFlipper.setInAnimation(slideLeftIn);
  58. viewFlipper.setOutAnimation(slideLeftOut);
  59. viewFlipper.showNext();
  60. } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
  61. viewFlipper.setInAnimation(slideRightIn);
  62. viewFlipper.setOutAnimation(slideRightOut);
  63. viewFlipper.showPrevIoUs();
  64. }
  65. } catch (Exception e) {
  66. // nothing
  67. }
  68. return false;
  69. }
  70. }
  71.  
  72. @Override // ------------------------------ Catch the Gesture Event by Overriding onTouch() method: -->
  73. public boolean onTouchEvent(MotionEvent event) {
  74. if (gestureDetector.onTouchEvent(event))
  75. return true;
  76. else
  77. return false;
  78. }

动画* .xml的:

  1. <?xml version="1.0" encoding="utf-8"?>
  2.  
  3. <set xmlns:android="http://schemas.android.com/apk/res/android">
  4. <translate android:fromXDelta="100%p" android:toXDelta="0" android:duration="800"/>
  5. </set>

解决方法

我认为问题是你没有覆盖OnDown事件.将此代码添加到MyGestureDetector类中,它应该可以正常工作.
  1. @Override
  2. public boolean onDown(MotionEvent e) {
  3. return true;
  4. }

onDown事件默认返回false,每个手势都以onDown开头,因此你的onFling事件不会触发.

伊什特万

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