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01private VelocityTracker velocityTracker;//用于得到手势在屏幕上的滑动速度02private static final int VELOCI…
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
| 01 |
private VelocityTracker velocityTracker;//用于得到手势在屏幕上的滑动速度 |
| 02 |
private static final int VELOCITY = 600; |
| 04 |
public boolean onTouchEvent(MotionEvent event) { |
| 05 |
String localClassName = getLocalClassName();//当前所在类名 |
| 06 |
LogUtil.log(TAG, "class Name:"+localClassName); |
| 07 |
int action = event.getAction(); |
| 08 |
//float x = event.getX(); |
| 09 |
//float y = event.getY(); |
| 12 |
case MotionEvent.ACTION_DOWN: |
| 13 |
if(velocityTracker == null){ |
| 14 |
velocityTracker = VelocityTracker.obtain();//取得手势在屏幕上的滑动速度 |
| 15 |
velocityTracker.addMovement(event); |
| 21 |
case MotionEvent.ACTION_MOVE: |
| 22 |
//int deltaX = (int) (lastMotionX - x); |
| 23 |
if(velocityTracker != null){ |
| 24 |
velocityTracker.addMovement(event); |
| 29 |
case MotionEvent.ACTION_UP: |
| 32 |
if(velocityTracker != null){ |
| 33 |
velocityTracker.addMovement(event); |
| 34 |
velocityTracker.computeCurrentVelocity(1000);//计算每秒滑动多少个像素 |
| 35 |
velocityX = (int) velocityTracker.getXVelocity();//最后计算检索X速度 |
| 38 |
if(velocityX > VELOCITY ){ |
| 39 |
if("ui.MainActivity".equals(localClassName)){ |
| 40 |
switchToTvLiveActivity(); |
| 41 |
}else if("ui.LocalMediaActivity".equals(localClassName)){ |
| 42 |
switchToMainActivity(); |
| 43 |
}else if("ui.NetMediaActivity".equals(localClassName)){ |
| 44 |
switchToLocalMediaActivity(); |
| 45 |
}else if("ui.TvLiveActivity".equals(localClassName)){ |
| 46 |
switchToNetMediaActivity(); |
| 48 |
} else if(velocityX < -VELOCITY ){ |
| 49 |
if("ui.MainActivity".equals(localClassName)){ |
| 50 |
switchToLocalMediaActivity(); |
| 51 |
}else if("ui.LocalMediaActivity".equals(localClassName)){ |
| 52 |
switchToNetMediaActivity(); |
| 53 |
}else if("ui.NetMediaActivity".equals(localClassName)){ |
| 54 |
switchToTvLiveActivity(); |
| 55 |
}else if("ui.TvLiveActivity".equals(localClassName)){ |
| 56 |
switchToMainActivity(); |
| 60 |
if(velocityTracker != null){ |
| 61 |
velocityTracker.recycle();//回收 |
| 62 |
velocityTracker = null; |
