[置顶] 安卓修改系统的屏幕亮度

首先要添加系统权限<uses-permission android:name="android.permission.WRITE_SETTINGS" />

 

Activity里面的代码如下

 

 seekBar = (SeekBar)layout.findViewById(R.id.seekBar1);
      text2 = (TextView)layout.findViewById(R.id.textView3);
      checkbox = (CheckBox)layout.findViewById(R.id.checkBox1);
     
         //进度条绑定最大亮度，255是最大亮度
         seekBar.setMax(255);
         //取得当前亮度
         int normal = Settings.System.getInt(getContentResolver(),
     Settings.System.SCREEN_BRIGHTNESS, 255);
         text2.setText(String.valueOf(normal));
        
     
         //进度条绑定当前亮度
         seekBar.setProgress(normal);
         seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
    
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
     //取得当前进度
      checkbox.setChecked(false); 
     int tmpInt = seekBar.getProgress();
     text2.setText(String.valueOf(tmpInt));
     //当进度小于80时，设置成80，防止太黑看不见的后果。
     if (tmpInt < 40) {
      tmpInt = 40;
     }
     
     //根据当前进度改变亮度
     Settings.System.putInt(getContentResolver(),
       Settings.System.SCREEN_BRIGHTNESS, tmpInt);
     tmpInt = Settings.System.getInt(getContentResolver(),
       Settings.System.SCREEN_BRIGHTNESS, -1);
     WindowManager.LayoutParams wl = getWindow()
       .getAttributes();

     float tmpFloat = (float) tmpInt / 255;
     if (tmpFloat > 0 && tmpFloat <= 1) {
      wl.screenBrightness = tmpFloat;
     }
     getWindow().setAttributes(wl);
     
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
     // TODO Auto-generated method stub
    }
    
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress,
      boolean fromUser) {
     // TODO Auto-generated method stub
    }
   });
   checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
    
    @Override
    public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
     // TODO 自动生成的方法存根
     text2.setText("150");
     int light = 150;
     Settings.System.putInt(getContentResolver(),
       Settings.System.SCREEN_BRIGHTNESS, light);
     light = Settings.System.getInt(getContentResolver(),
       Settings.System.SCREEN_BRIGHTNESS, -1);
     WindowManager.LayoutParams wl = getWindow()
       .getAttributes();

     float tmpFloat = (float) light / 255;
     if (tmpFloat > 0 && tmpFloat <= 1) {
      wl.screenBrightness = tmpFloat;
     }
     getWindow().setAttributes(wl);
                
    }
   });
           

 

xml的代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

   
    <LinearLayout
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:orientation="horizontal" >
   <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:textSize="20sp"
        android:text="背景亮度为：" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         />
   
    </LinearLayout>
 
<SeekBar
        android:id="@+id/seekBar1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
         />

<CheckBox
    android:id="@+id/checkBox1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:checked="false"
    android:text="默认亮度" />
 
    </LinearLayout>