用GestureDetector实现手指滑动切换Activity

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为实现滑动切换，使用手势检测器GestureDetector类来识别用户手势，设置OnGestureListener监听器，在onFling方法中切换界面，用xml文件定义动画效果。

1.定义动画： <?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="500" android:fromxdelta="100%p" android:toxdelta="0"> <alpha android:duration="500" android:fromalpha="0.1" android:toalpha="1.0"></alpha></translate></set><?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="500" android:fromxdelta="0" android:toxdelta="-100%p"> <alpha android:duration="500" android:fromalpha="0.1" android:toalpha="1.0"></alpha></translate></set><?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="500" android:fromxdelta="-100%p" android:toxdelta="0"> <alpha android:duration="500" android:fromalpha="0.1" android:toalpha="1.0"></alpha></translate></set><?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="500" android:fromxdelta="0" android:toxdelta="100%p"> <alpha android:duration="500" android:fromalpha="0.1" android:toalpha="1.0"></alpha></translate></set>

2.使用GestureDetector类识别手势，滑动切换界面public class MainActivity extends ActionBarActivity implementsOnGestureListener {public static final float FLIP_DISTANCE = 50;GestureDetector detector;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);detector = new GestureDetector(this, this);//让activity实现监听事件的接口}@Overridepublic boolean onTouchEvent(MotionEvent event) {return detector.onTouchEvent(event);}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {// 通过e1与e2位置x值的比较判断是向左还是向右滑动if ((e1.getX() - e2.getX()) > FLIP_DISTANCE) {Intent intent = new Intent();intent.setClass(getApplicationContext(), FirstActivity.class);startActivity(intent);// 翻页的动画效果,overridePendingTransition(R.anim.left_in, R.anim.right_out);return true;} else {// 已经是第一个界面了，打印toast提示Toast.makeText(this, "已经是第一个界面了..", 0).show();}return false;}@Overridepublic boolean onDown(MotionEvent e) {// TODO Auto-generated method stubreturn false;}@Overridepublic void onShowPress(MotionEvent e) {}@Overridepublic boolean onSingleTapUp(MotionEvent e) {return false;}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,float distanceY) {return false;}@Overridepublic void onLongPress(MotionEvent e) {}}

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