Android调节屏幕亮度实现代码

这篇文章主要介绍了Android调节屏幕亮度实现代码,调节屏幕亮度时,先设置当前activity亮度,再并保存为系统亮度即可,本文分别给出两个步骤的实现代码,需要的朋友可以参考下

调节屏幕亮度时，先设置当前activity亮度，再并保存为系统亮度即可。

1 onCreate()里检查系统亮度并设置seekBar：

private            void            screenBrightness_check()         


           {         


                     //先关闭系统的亮度自动调节         


                     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();         


                     }         


                     //获取当前亮度,获取失败则返回255         


                     intScreenBrightness=(          int          )(android.provider.Settings.System.getInt(getContentResolver(),         


                     android.provider.Settings.System.SCREEN_BRIGHTNESS,         


                     255          ));         


                     //文本、进度条显示         


                     mSeekBar_light.setProgress(intScreenBrightness);         


                     mTextView_light.setText(          ""          +intScreenBrightness*          100          /          255          );         


                     


           }

2 拖动seekBar时设置当前activity亮度，并保存为系统亮度：
        

//屏幕亮度         


                     private            void            setScreenBritness(          int            brightness)         


                     {         


                     //不让屏幕全暗         


                     if          (brightness<=          1          )         


                     {         


                     brightness=          1          ;         


                     }         


                     //设置当前activity的屏幕亮度         


                     WindowManager.LayoutParams lp =           this          .getWindow().getAttributes();         


                     //0到1,调整亮度暗到全亮         


                     lp.screenBrightness = Float.valueOf(brightness/255f);          


                     this          .getWindow().setAttributes(lp);         


                     


                     //保存为系统亮度方法1         


                     android.provider.Settings.System.putInt(getContentResolver(),         


                     android.provider.Settings.System.SCREEN_BRIGHTNESS,         


                     brightness);         


                     


                     //保存为系统亮度方法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);         


                     


                     //更改亮度文本显示         


                     mTextView_light.setText(          ""          +brightness*          100          /          255          );         


                     }