Android Open Source - vanilindy Media Button Receiver

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2012 Christopher Eby <kreed@kreed.org>
 */*from  ww  w  . j a  va  2s . c om*/
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package ch.blinkenlights.android.vanilla;

import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.media.AsyncPlayer;
import android.media.AudioManager;
import android.net.Uri;
import android.os.Build;
import android.os.SystemClock;
import android.view.KeyEvent;

/**
 * Receives media button events and calls to PlaybackService to respond
 * appropriately.
 */
public class MediaButtonReceiver extends BroadcastReceiver {
    /**
   * If another button event is received before this time in milliseconds
   * expires, the event with be considered a double click.
   */
  private static final int DOUBLE_CLICK_DELAY = 400;

  /**
   * Whether the headset controls should be used. 1 for yes, 0 for no, -1 for
   * uninitialized.
   */
  private static int sUseControls = -1;
  /**
   * Time of the last play/pause click. Used to detect double-clicks.
   */
  private static long sLastClickTime = 0;
  /**
   * Whether a beep should be played in response to double clicks be used.
   * 1 for yes, 0 for no, -1 for uninitialized.
   */
  private static int sBeep = -1;
  /**
   * Lazy-loaded AsyncPlayer for beep sounds.
   */
  private static AsyncPlayer sBeepPlayer;
  /**
   * Lazy-loaded URI of the beep resource.
   */
  private static Uri sBeepSound;

  /**
   * Play a beep sound.
   */
  private static void beep(Context context)
  {
    if (sBeep == -1) {
      SharedPreferences settings = PlaybackService.getSettings(context);
      sBeep = settings.getBoolean(PrefKeys.MEDIA_BUTTON_BEEP, true) ? 1 : 0;
    }

    if (sBeep == 1) {
      if (sBeepPlayer == null) {
        sBeepPlayer = new AsyncPlayer("BeepPlayer");
        sBeepSound = Uri.parse("android.resource://ch.blinkenlights.android.vanilla/raw/beep");
      }
      sBeepPlayer.play(context, sBeepSound, false, AudioManager.STREAM_MUSIC);
    }
  }

  /**
   * Reload the preferences and enable/disable buttons as appropriate.
   *
   * @param context A context to use.
   */
  public static void reloadPreference(Context context)
  {
    sUseControls = -1;
    sBeep = -1;
    if (useHeadsetControls(context)) {
      registerMediaButton(context);
    } else {
      unregisterMediaButton(context);
    }
  }

  /**
   * Return whether headset controls should be used, loading the preference
   * if necessary.
   *
   * @param context A context to use.
   */
  public static boolean useHeadsetControls(Context context)
  {
    if (sUseControls == -1) {
      SharedPreferences settings = PlaybackService.getSettings(context);
      sUseControls = settings.getBoolean(PrefKeys.MEDIA_BUTTON, true) ? 1 : 0;
    }

    return sUseControls == 1;
  }

  /**
   * Process a media button key press.
   *
   * @param context A context to use.
   * @param event The key press event.
   * @return True if the event was handled and the broadcast should be
   * aborted.
   */
  public static boolean processKey(Context context, KeyEvent event)
  {
    if (event == null || !useHeadsetControls(context))
      return false;

    int action = event.getAction();
    String act = null;

    switch (event.getKeyCode()) {
    case KeyEvent.KEYCODE_HEADSETHOOK:
    case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
      // single click: pause/resume.
      // double click: next track

      if (action == KeyEvent.ACTION_DOWN) {
        long time = SystemClock.uptimeMillis();
        if (time - sLastClickTime < DOUBLE_CLICK_DELAY) {
          beep(context);
          act = PlaybackService.ACTION_NEXT_SONG_AUTOPLAY;
        } else {
          act = PlaybackService.ACTION_TOGGLE_PLAYBACK;
        }
        sLastClickTime = time;
      }
      break;
    case KeyEvent.KEYCODE_MEDIA_NEXT:
      if (action == KeyEvent.ACTION_DOWN)
        act = PlaybackService.ACTION_NEXT_SONG_AUTOPLAY;
      break;
    case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
      if (action == KeyEvent.ACTION_DOWN)
        act = PlaybackService.ACTION_REWIND_SONG;
      break;
    case KeyEvent.KEYCODE_MEDIA_PLAY:
      if (action == KeyEvent.ACTION_DOWN)
        act = PlaybackService.ACTION_PLAY;
      break;
    case KeyEvent.KEYCODE_MEDIA_PAUSE:
      if (action == KeyEvent.ACTION_DOWN)
        act = PlaybackService.ACTION_PAUSE;
      break;
    default:
      return false;
    }

    if (act != null) {
      Intent intent = new Intent(context, PlaybackService.class);
      intent.setAction(act);
      context.startService(intent);
    }

    return true;
  }

  /**
   * Request focus on the media buttons from AudioManager if media buttons
   * are enabled.
   *
   * @param context A context to use.
   */
  public static void registerMediaButton(Context context)
  {
    if (!useHeadsetControls(context))
      return;

    AudioManager audioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
    ComponentName receiver = new ComponentName(context.getPackageName(), MediaButtonReceiver.class.getName());
    audioManager.registerMediaButtonEventReceiver(receiver);
  }

  /**
   * Unregister the media buttons from AudioManager.
   *
   * @param context A context to use.
   */
  public static void unregisterMediaButton(Context context)
  {
    AudioManager audioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
    ComponentName receiver = new ComponentName(context.getPackageName(), MediaButtonReceiver.class.getName());
    audioManager.unregisterMediaButtonEventReceiver(receiver);
  }

  @Override
  public void onReceive(Context context, Intent intent)
  {
    if (Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction())) {
      KeyEvent event = intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
      boolean handled = processKey(context, event);
      if (handled && isOrderedBroadcast())
        abortBroadcast();
    }
  }
}

Java Source Code List

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