Android Open Source - esr-scanner Beep Manager

From Project

Back to project page esr-scanner.
License

The source code is released under:
Apache License
If you think the Android project esr-scanner listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

/*
 * Copyright (C) 2010 ZXing authors/*  ww  w  . j ava2 s  .  c om*/
 * 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 ch.luklanis.esscan;

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;

import java.io.IOException;

/**
 * Manages beeps and vibrations for {@link CaptureActivity}.
 * <p/>
 * 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 static final long VIBRATE_DURATION = 200L;


    private final Context context;
    private MediaPlayer mediaPlayer;
    private boolean playBeep;

    private boolean vibrate;

    public BeepManager(Context context) {
        this.context = context;
        this.mediaPlayer = null;
        updatePrefs();
    }

    public void updatePrefs() {
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
        playBeep = shouldBeep(prefs, context);
        vibrate = prefs.getBoolean(PreferencesActivity.KEY_VIBRATE, false);
        if (playBeep && mediaPlayer == null) {
            // Uncomment to use BeepManager in input method also
//      // 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(context);
        }
    }

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