Android Open Source - EnergyWastingApp Display

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License

The source code is released under:

Copyright ? 2013-2014 Pekka Ekman <pekka.ekman@aalto.fi> 2013 Babujee Jerome Robin <robin.babujeejerome@aalto.fi> Permission is hereby granted, free of charge, to any person obtaining a ...

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Java Source Code

package fi.aalto.pekman.energywastingapp.components;
// w w  w .  j  a  v  a  2  s  .c  o m
import fi.aalto.pekman.energywastingapp.R;

import android.annotation.TargetApi;
import android.support.v7.app.ActionBar;
import android.os.Build;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;

public class Display extends Component {

  private boolean isStateSaved = false;
  private int savedBrightnessMode;
  private float savedBrightness;
  private int savedFlags;
  private boolean savedActionBarShowing;
  private float brightness = 1.0F;

  @Override
  public String getName() { return "Display"; }

  @TargetApi(8)
  @Override
  public void start() {
    
    // set brightness mode to manual if it's automatic
    if (Build.VERSION.SDK_INT >= 8) {
      int brightnessMode;
      try {
        brightnessMode = Settings.System.getInt(
            context.getContentResolver(),
            Settings.System.SCREEN_BRIGHTNESS_MODE);
        savedBrightnessMode = brightnessMode;
      } catch (SettingNotFoundException e) {
        Log.e("Display.start()", e.toString(), e);
        markTurnedOff();
        return;
      }
      
      if (brightnessMode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {
        Settings.System.putInt(
            context.getContentResolver(),
            Settings.System.SCREEN_BRIGHTNESS_MODE,
            Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL );
      }
    }
    
    // set brightness, keep screen on, and turn on fullscreen
    WindowManager.LayoutParams layoutParams = context.getWindow().getAttributes();
    savedBrightness = layoutParams.screenBrightness;
    savedFlags = layoutParams.flags;
    layoutParams.screenBrightness = brightness;
    layoutParams.flags |=
        WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON |
        WindowManager.LayoutParams.FLAG_FULLSCREEN;
    context.getWindow().setAttributes(layoutParams);
    
    // white screen for max power consumption with OLED screens:
    
    // make WhiteScreen visible
    View whiteScreen = context.findViewById(R.id.WhiteScreen);
    whiteScreen.setVisibility(View.VISIBLE);
    // hide action bar
    ActionBar ab = context.getSupportActionBar();
    savedActionBarShowing = ab.isShowing();
    if (savedActionBarShowing)
      ab.hide();
    // set onClick listener to turn WhiteScreen off
    whiteScreen.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        stop();
        markTurnedOff();
      }
    });
    
    isStateSaved = true;
  }

  @TargetApi(8)
  @Override
  public void stop() {
    // restore screen state
    if (isStateSaved) {
      if (Build.VERSION.SDK_INT >= 8) {
        Settings.System.putInt(
            context.getContentResolver(),
            Settings.System.SCREEN_BRIGHTNESS_MODE,
            savedBrightnessMode );
      }
      
      WindowManager.LayoutParams layoutParams = context.getWindow().getAttributes();
      layoutParams.screenBrightness = savedBrightness;
      layoutParams.flags = savedFlags;
      context.getWindow().setAttributes(layoutParams);
      
      if (savedActionBarShowing)
        context.getSupportActionBar().show();
      
      isStateSaved = false;
    }
    
    // hide WhiteScreen
    View whiteScreen = context.findViewById(R.id.WhiteScreen);
    whiteScreen.setVisibility(View.GONE);
  }

  @Override
  public void onPause() {
    stop();
    markTurnedOff();
  }

  @Override public boolean isAdjustable() {
    // brightness can only be adjusted on API level >= 8
    return Build.VERSION.SDK_INT >= 8;
  }
  @Override public int getAdjustmentMin() { return 10; }
  @Override public int getAdjustmentMax() { return 100; }
  
  @Override
  protected void onAdjustmentChange(int value) {
    brightness = value / 100.0F;
  }

}

Java Source Code List