Android Open Source - final_app Beep Manager

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The source code is released under:

CC0 1.0 Universal Statement of Purpose The laws of most jurisdictions throughout the world automatically confer exclusive Copyright and Related Rights (defined below) upon the creator and subsequent...

Java Source Code

/*
 * Copyright (C) 2010 ZXing authors//  www.j  a  v  a2 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.google.zxing.client.android;

import java.io.IOException;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.AssetFileDescriptor;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Vibrator;
import android.preference.PreferenceManager;
import android.util.Log;

/**
 * Manages beeps and vibrations for {@link CaptureActivity}.
 */
final class BeepManager implements MediaPlayer.OnCompletionListener, MediaPlayer.OnErrorListener {

  private static final String TAG = BeepManager.class.getSimpleName();

  private static final float BEEP_VOLUME = 0.10f;
  private static final long VIBRATE_DURATION = 200L;

  private final Activity activity;
  private MediaPlayer mediaPlayer;
  private boolean playBeep;
  private boolean vibrate;

  BeepManager(Activity activity) {
    this.activity = activity;
    this.mediaPlayer = null;
    updatePrefs();
  }

  synchronized void updatePrefs() {
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
    playBeep = shouldBeep(prefs, activity);
    vibrate = prefs.getBoolean(PreferencesActivity.KEY_VIBRATE, false);
    if (playBeep && mediaPlayer == null) {
      // The volume on STREAM_SYSTEM is not adjustable, and users found it too loud,
      // so we now play on the music stream.
      activity.setVolumeControlStream(AudioManager.STREAM_MUSIC);
      mediaPlayer = buildMediaPlayer(activity);
    }
  }

  synchronized void playBeepSoundAndVibrate() {
    if (playBeep && mediaPlayer != null) {
      mediaPlayer.start();
    }
    if (vibrate) {
      Vibrator vibrator = (Vibrator) activity.getSystemService(Context.VIBRATOR_SERVICE);
      vibrator.vibrate(VIBRATE_DURATION);
    }
  }

  private static boolean shouldBeep(SharedPreferences prefs, Context activity) {
    boolean shouldPlayBeep = prefs.getBoolean(PreferencesActivity.KEY_PLAY_BEEP, true);
    if (shouldPlayBeep) {
      // See if sound settings overrides this
      AudioManager audioService = (AudioManager) activity.getSystemService(Context.AUDIO_SERVICE);
      if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
        shouldPlayBeep = false;
      }
    }
    return shouldPlayBeep;
  }

  private MediaPlayer buildMediaPlayer(Context activity) {
    MediaPlayer mediaPlayer = new MediaPlayer();
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mediaPlayer.setOnCompletionListener(this);
    mediaPlayer.setOnErrorListener(this);

    AssetFileDescriptor file = activity.getResources().openRawResourceFd(R.raw.beep);
    try {
      mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(), file.getLength());
      file.close();
      mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
      mediaPlayer.prepare();
    } catch (IOException ioe) {
      Log.w(TAG, ioe);
      mediaPlayer = null;
    }
    return mediaPlayer;
  }

  @Override
  public void onCompletion(MediaPlayer mp) {
    // When the beep has finished playing, rewind to queue up another one.
    mp.seekTo(0);
  }

  @Override
  public synchronized boolean onError(MediaPlayer mp, int what, int extra) {
    if (what == MediaPlayer.MEDIA_ERROR_SERVER_DIED) {
      // we are finished, so put up an appropriate error toast if required and finish
      activity.finish();
    } else {
      // possibly media player error, so release and recreate
      mp.release();
      mediaPlayer = null;
      updatePrefs();
    }
    return true;
  }

}

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