android 设立系统屏幕亮度

/**	 * 获得当前屏幕亮度的模式    	 * SCREEN_BRIGHTNESS_MODE_AUTOMATIC=1 为自动调节屏幕亮度	 * SCREEN_BRIGHTNESS_MODE_MANUAL=0  为手动调节屏幕亮度	 */	  private int getScreenMode(){	    int screenMode=0;	    try{	    	screenMode = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE);	    }	    catch (Exception localException){	    		    }	    return screenMode;	  }	  	 /**	 * 获得当前屏幕亮度值  0--255	 */	  private int getScreenBrightness(){	    int screenBrightness=255;	    try{	    	screenBrightness = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);	    }	    catch (Exception localException){	      	    }	    return screenBrightness;	  }	/**	 * 设置当前屏幕亮度的模式    	 * SCREEN_BRIGHTNESS_MODE_AUTOMATIC=1 为自动调节屏幕亮度	 * SCREEN_BRIGHTNESS_MODE_MANUAL=0  为手动调节屏幕亮度	 */	  private void setScreenMode(int paramInt){	    try{	      Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, paramInt);	    }catch (Exception localException){	      localException.printStackTrace();	    }	  }	  /**	   * 设置当前屏幕亮度值  0--255	   */	  private void saveScreenBrightness(int paramInt){	    try{	      Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, paramInt);	    }	    catch (Exception localException){	      localException.printStackTrace();	    }	  }	  /**	   * 保存当前的屏幕亮度值，并使之生效	   */	  private void setScreenBrightness(int paramInt){	    Window localWindow = getWindow();	    WindowManager.LayoutParams localLayoutParams = localWindow.getAttributes();	    float f = paramInt / 255.0F;	    localLayoutParams.screenBrightness = f;	    localWindow.setAttributes(localLayoutParams);	  }	  	

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