Android中 视频屏幕左半部分上下滑动改变亮度右半部分上下滑动改变声音

private float startY;//记录手指按下时的Y坐标private float startX;//记录手指按下时的Y坐标private int downVol;//记录手指按下时的音量private Vibrator vibrator;//手机震动器//不要忘记震动权限<uses-permission android:name="android.permission.VIBRATE" />/** 设置屏幕亮度 lp = 0 全暗 ，lp= -1,根据系统设置， lp = 1; 最亮*/public void setBrightness(float brightness) {WindowManager.LayoutParams lp = getWindow().getAttributes();// if (lp.screenBrightness <= 0.1) {// return;// }lp.screenBrightness = lp.screenBrightness + brightness / 255.0f;if (lp.screenBrightness > 1) {lp.screenBrightness = 1;vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);long[] pattern = { 10, 200 }; // OFF/ON/OFF/ON... 关闭10秒震动200毫秒，不停切换vibrator.vibrate(pattern, -1);} else if (lp.screenBrightness < 0.2) {lp.screenBrightness = (float) 0.2;vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);long[] pattern = { 10, 200 }; // OFF/ON/OFF/ON...vibrator.vibrate(pattern, -1);}getWindow().setAttributes(lp);}@Overridepublic boolean onTouchEvent(MotionEvent event) {//把事件传递给手势识别器（注：对事件只进行了解析处理，没有拦截，解析成手势识别的单击、双击、长按）detector.onTouchEvent(event);switch (event.getAction()) {case MotionEvent.ACTION_DOWN :startY=event.getY();startX=event.getX();downVol=audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);handler.removeMessages(HIDE_CONTROL);break;case MotionEvent.ACTION_MOVE :float endY=event.getY();float distanceY=startY-endY;if(startX>screenWidth/2){//屏幕右半部分上滑，声音变大，下滑，声音变小int touchRang=Math.min(screenWidth,screenHeight);//int curvol= (int) (downVol+(distance/screenHeight)*maxVolume);int curvol= (int) (downVol+(distanceY/touchRang)*maxVolume);//考虑到横竖屏切换的问题int volume=Math.min(Math.max(0,curvol),maxVolume);updateVolume(volume);}else{//屏幕左半部分上滑，亮度变大，下滑，亮度变小final double FLING_MIN_DISTANCE = 0.5;final double FLING_MIN_VELOCITY = 0.5;if (distanceY > FLING_MIN_DISTANCE && Math.abs(distanceY) > FLING_MIN_VELOCITY) {setBrightness(20);}if (distanceY < FLING_MIN_DISTANCE&& Math.abs(distanceY) > FLING_MIN_VELOCITY) {setBrightness(-20);}}break;case MotionEvent.ACTION_UP :handler.sendEmptyMessageDelayed(HIDE_CONTROL,5000);break;}return super.onTouchEvent(event);}