Android 播放電影時滑動螢幕調整螢幕亮度

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（轉自：http://blog.csdn.net/piaozhiye/article/details/6544450）

發現有一些主流的播放器播放電影時可以通過滑動螢幕調整螢幕亮度，其實實現起來也很容易。 主要根據滑動的方向來設定螢幕亮度，以下這個demo實現向上滑動螢幕變亮，向下滑動則螢幕變暗。當的螢幕達到最亮或最暗（20%）的時候，裝置會震動，代碼簡單，不多說。 同時裝置震動需要有許可權

<uses-permission android:name="android.permission.VIBRATE" />

 

  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      * 設定螢幕亮度 lp = 0 全暗 ，lp= -1,根據系統設定， 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 }  

 

測試補充.XML;

 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>

 

Android 播放電影時滑動螢幕調整螢幕亮度（轉）