Android Open Source - nsa-away Beep Manager

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) 2010 ZXing authors/* ww  w . j  av a  2s .c  o m*/
 * Copyright 2011 Robert Theis
 *
 * 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 org.sector67.nsaaway.ocr.complex;

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.preference.PreferenceManager;
import android.util.Log;

import java.io.IOException;

import org.sector67.nsaaway.R;

/**
 * Manages beeps and vibrations for {@link CaptureActivity}.
 * 
 * The code for this class was adapted from the ZXing project: http://code.google.com/p/zxing/
 */
public final class BeepManager {

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

  private static final float BEEP_VOLUME = 0.10f;

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

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

  public void updatePrefs() {
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
    playBeep = shouldBeep(prefs, activity);
    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);
    }
  }

  public void playBeepSoundAndVibrate() {
    if (playBeep && mediaPlayer != null) {
      mediaPlayer.start();
    }
  }

  private static boolean shouldBeep(SharedPreferences prefs, Context activity) {
    boolean shouldPlayBeep = prefs.getBoolean(PreferencesActivity.KEY_PLAY_BEEP, CaptureActivity.DEFAULT_TOGGLE_BEEP);
    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 static MediaPlayer buildMediaPlayer(Context activity) {
    MediaPlayer mediaPlayer = new MediaPlayer();
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    // When the beep has finished playing, rewind to queue up another one.
    mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
      public void onCompletion(MediaPlayer player) {
        player.seekTo(0);
      }
    });

    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;
  }

}

Java Source Code List

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