/*
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* Copyright (C) 2010 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.zxing.scanner;
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import android.content.Context;
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import android.content.res.AssetFileDescriptor;
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import android.media.AudioManager;
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import android.media.MediaPlayer;
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import android.os.Vibrator;
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import java.io.Closeable;
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import java.io.IOException;
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/**
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* Manages beeps and vibrations
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*/
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final class BeepManager implements MediaPlayer.OnErrorListener, Closeable {
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private static final float BEEP_VOLUME = 0.10f;
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private static final long VIBRATE_DURATION = 200L;
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private final Context context;
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private MediaPlayer mediaPlayer;
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private boolean playBeep;
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private boolean vibrate;
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private int mediaResId;
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BeepManager(Context context) {
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this(context, 0);
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}
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BeepManager(Context context, int mediaResId) {
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this.context = context;
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this.mediaPlayer = null;
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setMediaResId(mediaResId);
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}
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public void setMediaResId(int mediaResId) {
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this.mediaResId = mediaResId;
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updatePrefs();
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}
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synchronized void updatePrefs() {
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//加入声音资源ID的判断
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playBeep = shouldBeep(context) && mediaResId > 0;
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if (playBeep && mediaPlayer == null) {
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mediaPlayer = buildMediaPlayer(context);
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}
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// 振动
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vibrate = false;
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}
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synchronized void playBeepSoundAndVibrate() {
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if (playBeep && mediaPlayer != null) {
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mediaPlayer.start();
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}
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if (vibrate) {
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Vibrator vibrator = (Vibrator) context
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.getSystemService(Context.VIBRATOR_SERVICE);
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vibrator.vibrate(VIBRATE_DURATION);
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}
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}
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private static boolean shouldBeep(Context activity) {
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// 播放提示音
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boolean shouldPlayBeep = true;
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if (shouldPlayBeep) {
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// See if sound settings overrides this
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AudioManager audioService = (AudioManager) activity.getSystemService(Context.AUDIO_SERVICE);
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if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
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shouldPlayBeep = false;
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}
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}
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return shouldPlayBeep;
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}
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private MediaPlayer buildMediaPlayer(Context activity) {
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MediaPlayer mediaPlayer = new MediaPlayer();
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try {
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AssetFileDescriptor file = activity.getResources().openRawResourceFd(mediaResId);
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try {
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mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(), file.getLength());
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} finally {
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file.close();
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}
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mediaPlayer.setOnErrorListener(this);
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mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
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mediaPlayer.setLooping(false);
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mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
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mediaPlayer.prepare();
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return mediaPlayer;
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} catch (IOException ioe) {
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mediaPlayer.release();
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return null;
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}
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}
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@Override
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public synchronized boolean onError(MediaPlayer mp, int what, int extra) {
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if (what == MediaPlayer.MEDIA_ERROR_SERVER_DIED) {
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//播放错误
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} else {
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close();
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updatePrefs();
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}
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return true;
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}
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@Override
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public synchronized void close() {
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if (mediaPlayer != null) {
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mediaPlayer.release();
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mediaPlayer = null;
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}
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}
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}
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