Android Open Source - Chopping Brightness Refresh Activity

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License

The source code is released under:

Apache License

Java Source Code

package com.chopping.activities;
//from w  ww .ja  v  a2 s. c om

import android.app.Activity;
import android.os.Bundle;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.view.Window;
import android.view.WindowManager;

public final class BrightnessRefreshActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

    refreshBrightness(getBrightnessLevel());

    Thread t = new Thread() {
      public void run() {
        try {
          sleep(10);
        } catch (InterruptedException e) {
        }
        finish();
      }
    };
    t.start();
  }

  //----------------------------------------------------------
  // Description: Refresh brightness
  //
  // No all devices can react the change of brightness.
  // See.
  // http://stackoverflow.com/questions/14101669/change-brightness-according-to-surrounding-light-in-android
  //----------------------------------------------------------

  private void refreshBrightness(float brightness) {
    WindowManager.LayoutParams lp = getWindow().getAttributes();
    if (brightness < 0) {
      lp.screenBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE;
    } else {
      lp.screenBrightness = brightness;
    }
    getWindow().setAttributes(lp);
  }

  int getBrightnessLevel() {
    try {
      int value = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
      // convert brightness level to range 0..1
      value = value / 255;
      return value;
    } catch (SettingNotFoundException e) {
      return 0;
    }
  }
}

Java Source Code List

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