Android 播放电影时滑动屏幕调整屏幕亮度（转）

  1 [java] view plaincopyprint?
  2 package org.piaozhiye.demo;  
  3 import android.app.Activity;  
  4 import android.os.Bundle;  
  5 import android.os.Vibrator;  
  6 import android.util.Log;  
  7 import android.view.GestureDetector;  
  8 import android.view.MotionEvent;  
  9 import android.view.WindowManager;  
 10 import android.widget.MediaController;  
 11 import android.widget.VideoView;  
 12 public class MainActivity extends Activity {  
 13     private VideoView myVideoView;  
 14     private String path = "/mnt/sdcard/video/Wonder Girls_Nobody(英文版).mp4";  
 15     private String TAG = "MainActivity";  
 16     private GestureDetector mGestureDetector;  
 17     private Vibrator vibrator;  
 18     /** Called when the activity is first created. */  
 19     @Override  
 20     public void onCreate(Bundle savedInstanceState) {  
 21         super.onCreate(savedInstanceState);  
 22         setContentView(R.layout.main);  
 23         myVideoView = (VideoView) findViewById(R.id.myvideoview);  
 24         myVideoView.setVideoPath(path);  
 25         myVideoView.setMediaController(new MediaController(this));  
 26         myVideoView.requestFocus();  
 27         myVideoView.start();  
 28     }  
 29     /* 
 30      *  
 31      * 设置屏幕亮度 lp = 0 全暗 ，lp= -1,根据系统设置， lp = 1; 最亮 
 32      */  
 33     public void setBrightness(float brightness) {  
 34         WindowManager.LayoutParams lp = getWindow().getAttributes();  
 35         // if (lp.screenBrightness <= 0.1) {  
 36         // return;  
 37         // }  
 38         lp.screenBrightness = lp.screenBrightness + brightness / 255.0f;  
 39         if (lp.screenBrightness > 1) {  
 40             lp.screenBrightness = 1;  
 41             vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);  
 42             long[] pattern = { 10, 200 }; // OFF/ON/OFF/ON...  
 43             vibrator.vibrate(pattern, -1);  
 44         } else if (lp.screenBrightness < 0.2) {  
 45             lp.screenBrightness = (float) 0.2;  
 46             vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);  
 47             long[] pattern = { 10, 200 }; // OFF/ON/OFF/ON...  
 48             vibrator.vibrate(pattern, -1);  
 49         }  
 50         Log.e(TAG, "lp.screenBrightness= " + lp.screenBrightness);  
 51         getWindow().setAttributes(lp);  
 52     }  
 53     @Override  
 54     protected void onResume() {  
 55         mGestureDetector = new GestureDetector(  
 56                 new GestureDetector.OnGestureListener() {  
 57                     public boolean onSingleTapUp(MotionEvent e) {  
 58                         return false;  
 59                     }  
 60                     public boolean onDown(MotionEvent e) {  
 61                         return false;  
 62                     }  
 63                     public void onLongPress(MotionEvent e) {  
 64                     }  
 65                     public boolean onFling(MotionEvent e1, MotionEvent e2,  
 66                             float velocityX, float velocityY) {  
 67                         return true;  
 68                     }  
 69                     public boolean onScroll(MotionEvent e1, MotionEvent e2,  
 70                             float distanceX, float distanceY) {  
 71                         final double FLING_MIN_DISTANCE = 0.5;  
 72                         final double FLING_MIN_VELOCITY = 0.5;  
 73                         if (e1.getY() - e2.getY() > FLING_MIN_DISTANCE  
 74                                 && Math.abs(distanceY) > FLING_MIN_VELOCITY) {  
 75                             Log.e(TAG, "up");  
 76                             setBrightness(20);  
 77                         }  
 78                         if (e1.getY() - e2.getY() < FLING_MIN_DISTANCE  
 79                                 && Math.abs(distanceY) > FLING_MIN_VELOCITY) {  
 80                             Log.e(TAG, "down");  
 81                             setBrightness(-20);  
 82                         }  
 83                         return true;  
 84                     }  
 85                     public void onShowPress(MotionEvent e) {  
 86                         // TODO Auto-generated method stub  
 87                     }  
 88                 });  
 89         super.onResume();  
 90     }  
 91     public boolean onTouchEvent(MotionEvent event) {  
 92         boolean result = mGestureDetector.onTouchEvent(event);  
 93         if (!result) {  
 94             if (event.getAction() == MotionEvent.ACTION_UP) {  
 95                 // getVideoInfosfromPath(filePath);  
 96             }  
 97             result = super.onTouchEvent(event);  
 98         }  
 99         return result;  
100     }  
101     @Override  
102     protected void onStop() {  
103         if (null != vibrator) {  
104             vibrator.cancel();  
105         }  
106         super.onStop();  
107     }  
108 }  

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent" >
 5 
 6     <VideoView
 7         android:id="@+id/myvideoview"
 8         android:layout_width="match_parent"
 9         android:layout_height="match_parent" />
10 
11 </RelativeLayout>