Android Open Source - droidengine2d Default Key Event Processor

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License

The source code is released under:

Apache License

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Java Source Code

/*   Copyright 2013-2014 Miguel Vicente Linares
 *//from w  ww.j a  v  a 2 s.c  o m
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.miviclin.droidengine2d.input;

import android.app.Activity;
import android.content.Context;
import android.media.AudioManager;
import android.view.KeyEvent;

import com.miviclin.droidengine2d.util.time.TimeCounter;

/**
 * Default KeyEventProcessor. Processes the back key and the volume keys.
 * 
 * @author Miguel Vicente Linares
 * 
 */
public class DefaultKeyEventProcessor implements KeyEventProcessor {

  private static final int VOLUME_ADJUST_DELAY_MS = 120;

  private Activity activity;
  private TimeCounter timeSinceLastVolumeAdjustment;

  /**
   * Creates a new DefaultKeyEventProcessor.
   * 
   * @param activity Activity.
   */
  public DefaultKeyEventProcessor(Activity activity) {
    this.activity = activity;
    this.timeSinceLastVolumeAdjustment = new TimeCounter();
  }

  @Override
  public void processKeyEvent(KeyEventInfo event) {
    int keyCode = event.getKeyCode();
    if (keyCode == KeyEvent.KEYCODE_BACK) {
      activity.finish();
    } else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
      adjustVolume(AudioManager.ADJUST_RAISE);
    } else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
      adjustVolume(AudioManager.ADJUST_LOWER);
    }
  }

  /**
   * Returns the Activity.
   * 
   * @return Activity
   */
  public Activity getActivity() {
    return activity;
  }

  /**
   * Adjusts the volume of the current audio stream of the Activity.
   * 
   * @param direction The direction to adjust the volume. One of {@link AudioManager#ADJUST_LOWER},
   *            {@link AudioManager#ADJUST_RAISE}, or {@link AudioManager#ADJUST_SAME}.
   */
  private void adjustVolume(int direction) {
    timeSinceLastVolumeAdjustment.update();
    if (timeSinceLastVolumeAdjustment.getMilliseconds() < VOLUME_ADJUST_DELAY_MS) {
      return;
    }
    AudioManager audio = (AudioManager) activity.getSystemService(Context.AUDIO_SERVICE);
    audio.adjustVolume(direction, AudioManager.FLAG_SHOW_UI);
    timeSinceLastVolumeAdjustment.reset();
  }

}

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