Android Open Source - barcode-scanner-based-zxing-for-android Beep Manager

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (C) 2010 ZXing authors//from w w w.j a va 2s  . c om
 *
 * 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.res.AssetFileDescriptor;
import android.media.AudioManager;
import android.media.MediaPlayer;
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 final Activity activity;
    private MediaPlayer mediaPlayer;

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

    synchronized void initMediaPlayer() {
        if (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 (mediaPlayer != null) {
            mediaPlayer.start();
        }
    }

    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;
            initMediaPlayer();
        }
        return true;
    }

}

Java Source Code List