Android調節螢幕亮度實現代碼_Android

調節螢幕亮度時，先設定當前activity亮度，再並儲存為系統亮度即可。

1 onCreate()裡檢查系統亮度並設定seekBar：

     private void screenBrightness_check()     {          //先關閉系統的亮度自動調節          try          {              if(android.provider.Settings.System.getInt(getContentResolver(),android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE) == android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC)              {                       android.provider.Settings.System.putInt(getContentResolver(),                        android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE,                        android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);              }          }          catch (SettingNotFoundException e)          {              // TODO Auto-generated catch block              e.printStackTrace();          }          //擷取當前亮度,擷取失敗則返回255          intScreenBrightness=(int)(android.provider.Settings.System.getInt(getContentResolver(),                   android.provider.Settings.System.SCREEN_BRIGHTNESS,                   255));          //文本、進度條顯示          mSeekBar_light.setProgress(intScreenBrightness);          mTextView_light.setText(""+intScreenBrightness*100/255);              }

2 拖動seekBar時設定當前activity亮度，並儲存為系統亮度：
        

//螢幕亮度     private void setScreenBritness(int brightness)     {          //不讓螢幕全暗          if(brightness<=1)          {              brightness=1;          }          //設定當前activity的螢幕亮度          WindowManager.LayoutParams lp = this.getWindow().getAttributes();          //0到1,調整亮度暗到全亮          lp.screenBrightness = Float.valueOf(brightness/255f);           this.getWindow().setAttributes(lp);              //儲存為系統亮度方法1          android.provider.Settings.System.putInt(getContentResolver(),                   android.provider.Settings.System.SCREEN_BRIGHTNESS,                   brightness);                   //儲存為系統亮度方法2//        Uri uri = android.provider.Settings.System.getUriFor("screen_brightness"); //        android.provider.Settings.System.putInt(getContentResolver(), "screen_brightness", brightness);  //        // resolver.registerContentObserver(uri, true, myContentObserver); //        getContentResolver().notifyChange(uri, null);                   //更改亮度文本顯示          mTextView_light.setText(""+brightness*100/255);     }