以下代码用于Activity之间的划动切换，大概实现原理就是判断手指的划动速度和划动方向以确定向哪个Activity跳转，switchTo***Activity()为Activity的跳转方法
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private VelocityTracker velocityTracker;//用于得到手势在屏幕上的滑动速度
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private static final int VELOCITY = 600;
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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String localClassName = getLocalClassName();//当前所在类名
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LogUtil.log(TAG, "class Name:"+localClassName);
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int action = event.getAction();
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//float x = event.getX();
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//float y = event.getY();
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switch (action) {
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case MotionEvent.ACTION_DOWN:
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if(velocityTracker == null){
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velocityTracker = VelocityTracker.obtain();//取得手势在屏幕上的滑动速度
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velocityTracker.addMovement(event);
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}
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//lastMotionX = x;
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break;
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case MotionEvent.ACTION_MOVE:
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//int deltaX = (int) (lastMotionX - x);
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if(velocityTracker != null){
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velocityTracker.addMovement(event);
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}
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//lastMotionX = x;
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break;
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case MotionEvent.ACTION_UP:
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int velocityX = 0;
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if(velocityTracker != null){
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velocityTracker.addMovement(event);
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velocityTracker.computeCurrentVelocity(1000);//计算每秒滑动多少个像素
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velocityX = (int) velocityTracker.getXVelocity();//最后计算检索X速度
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}
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if(velocityX > VELOCITY ){
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if("ui.MainActivity".equals(localClassName)){
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switchToTvLiveActivity();
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}else if("ui.LocalMediaActivity".equals(localClassName)){
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switchToMainActivity();
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}else if("ui.NetMediaActivity".equals(localClassName)){
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switchToLocalMediaActivity();
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}else if("ui.TvLiveActivity".equals(localClassName)){
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switchToNetMediaActivity();
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}
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} else if(velocityX < -VELOCITY ){
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if("ui.MainActivity".equals(localClassName)){
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switchToLocalMediaActivity();
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}else if("ui.LocalMediaActivity".equals(localClassName)){
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switchToNetMediaActivity();
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}else if("ui.NetMediaActivity".equals(localClassName)){
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switchToTvLiveActivity();
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}else if("ui.TvLiveActivity".equals(localClassName)){
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switchToMainActivity();
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}
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}
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if(velocityTracker != null){
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velocityTracker.recycle();//回收
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velocityTracker = null;
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}
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break;
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}
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return true;
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}
