Android screen brightness adjustment code

To adjust the screen brightness, first set the current activity brightness and then save it as system brightness.

1. Check system brightness in onCreate() and set seekBar:

     private void screenBrightness_check()
     {
          // First turn off the automatic brightness adjustment of the system 
          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();
          }
          // Get current brightness , Returns if the fetch fails 255
          intScreenBrightness=(int)(android.provider.Settings.System.getInt(getContentResolver(),
                   android.provider.Settings.System.SCREEN_BRIGHTNESS,
                   255));
          // Text, progress bar display 
          mSeekBar_light.setProgress(intScreenBrightness);
          mTextView_light.setText(""+intScreenBrightness*100/255);
         
     }

2. When dragging seekBar, set the current activity brightness and save it as system brightness:

// The screen brightness 
     private void setScreenBritness(int brightness)
     {
          // Keep the screen dark 
          if(brightness<=1)
          {
              brightness=1;
          }
          // Set the current activity Screen brightness of 
          WindowManager.LayoutParams lp = this.getWindow().getAttributes();
          //0 to 1, Adjust the brightness to full brightness 
          lp.screenBrightness = Float.valueOf(brightness/255f); 
          this.getWindow().setAttributes(lp);
    
          // Save as system brightness method 1
          android.provider.Settings.System.putInt(getContentResolver(),
                   android.provider.Settings.System.SCREEN_BRIGHTNESS,
                   brightness);
         
          // Save as system brightness method 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);
         
          // Change brightness text display 
          mTextView_light.setText(""+brightness*100/255);
     }