按钮来管理屏幕的亮度

Question

我试图创建一个应用程序总是活动的（即永远不会在后台），与按钮时，按下可降低屏幕亮度。我声明我不是Android编程的专家。

Answer 1

您可以设置屏幕亮度o按钮点击为：

第一种方式：

@Override 
    public void onClick(View arg0) { 
    // TODO Auto-generated method stub 
    int curBrightnessValue=android.provider.Settings.System.getInt(
     getContentResolver(),android.provider.Settings.System.SCREEN_BRIGHTNESS); 
    setBrightness(curBrightnessValue-25);//set BRIGHTNESS 
    } 
private void setBrightness(int brightness) { 
    try { 
     IHardwareService hardware = IHardwareService.Stub.asInterface( 
     ServiceManager.getService("hardware")); 
     if (hardware != null) { 
     hardware.setScreenBacklight(brightness); 
     } 
    } catch (RemoteException doe) {    
    } 

的Manifest.xml

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

方式二：

@Override 
    public void onClick(View arg0) { 
    // TODO Auto-generated method stub 
    int curBrightnessValue=android.provider.Settings.System.getInt(
    getContentResolver(),android.provider.Settings.System.SCREEN_BRIGHTNESS); 
    int SysBackLightValue = curBrightnessValue-25; 
    android.provider.Settings.System.putInt(getContentResolver(), 
    android.provider.Settings.System.SCREEN_BRIGHTNESS, 
    SysBackLightValue); 
    } 

的AndroidManifest.xml：

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

终于为其他的方法来设置亮度看到this后