Android調(diào)節(jié)屏幕亮度實現(xiàn)代碼

更新時間：2015年05月06日 08:55:59 投稿：junjie

這篇文章主要介紹了Android調(diào)節(jié)屏幕亮度實現(xiàn)代碼,調(diào)節(jié)屏幕亮度時,先設(shè)置當(dāng)前activity亮度,再并保存為系統(tǒng)亮度即可,本文分別給出兩個步驟的實現(xiàn)代碼,需要的朋友可以參考下

調(diào)節(jié)屏幕亮度時，先設(shè)置當(dāng)前activity亮度，再并保存為系統(tǒng)亮度即可。

1 onCreate()里檢查系統(tǒng)亮度并設(shè)置seekBar：

     private void screenBrightness_check()
     {
          //先關(guān)閉系統(tǒng)的亮度自動調(diào)節(jié)
          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();
          }
          //獲取當(dāng)前亮度,獲取失敗則返回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(shè)置當(dāng)前activity亮度，并保存為系統(tǒng)亮度：

//屏幕亮度
     private void setScreenBritness(int brightness)
     {
          //不讓屏幕全暗
          if(brightness<=1)
          {
              brightness=1;
          }
          //設(shè)置當(dāng)前activity的屏幕亮度
          WindowManager.LayoutParams lp = this.getWindow().getAttributes();
          //0到1,調(diào)整亮度暗到全亮
          lp.screenBrightness = Float.valueOf(brightness/255f); 
          this.getWindow().setAttributes(lp);
    
          //保存為系統(tǒng)亮度方法1
          android.provider.Settings.System.putInt(getContentResolver(),
                   android.provider.Settings.System.SCREEN_BRIGHTNESS,
                   brightness);
         
          //保存為系統(tǒng)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);
     }

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