微信引入語音聊天後,使得語音聊天非常火。最近做了一個關于語音聊天demo,現在介紹下整個實作過程:包括錄音、儲存音頻檔案至SD卡、發送錄音檔案、接收新語音消息紅點提醒、播放暫停、未讀語音消息連續播放、播放模式切換。
錄音部分包括:音頻源、音頻格式、編碼器、音頻通道、采樣率、編碼率等步驟,具體實作如下:
try {
this.recorder = new MediaRecorder();
this.recorder.setAudioSource(AudioSource.MIC);//音頻源
this.recorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);//音頻格式
this.recorder.setAudioEncoder(1);//編碼器
this.recorder.setAudioChannels(1);//音頻通道
this.recorder.setAudioSamplingRate(8000);//采樣率
this.recorder.setAudioEncodingBitRate(64);//編碼率
this.voiceFilePath = getVoiceFilePath();
this.file = new File(this.voiceFilePath);
this.recorder.setOutputFile(this.file.getAbsolutePath());//輸出至指定檔案路徑
this.recorder.prepare();//準備錄音
this.isRecording = true;
this.recorder.start();//開始錄音
}catch(IOException localIOException) {
Log.e(TAG, "voice prepare() failed");
}
錄音過程中根據音量大小重新整理動畫,100ms重新整理一遍,開一個子線程操作,通過handler發送消息通知主線程:
new Thread(new Runnable() {
public void run() {
try {
while(VoiceRecorder.this.isRecording) {
Message localMessage = new Message();
double ratio = (double)recorder.getMaxAmplitude();
localMessage.arg1 = (int)((14*ratio)/32768);
localMessage.what = MessageActivity.VOICE_REFRESH;
VoiceRecorder.this.handler.sendMessage(localMessage);
SystemClock.sleep(100L);
}
}
catch(Exception localException) {
Log.e(TAG , localException.toString());
}
}
}).start();
主線程接收消息,重新整理錄音動畫:
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case VOICE_REFRESH:
if (msg.arg1 <= 1)
micImage.setImageDrawable(micImages[0]);
else
micImage.setImageDrawable(micImages[msg.arg1 >= 14 ? 14 : msg.arg1 - 1]);
break;
}
}
};
錄音時長可以自己設定,最後的10秒倒計時,也是開一個子線程進行計時,通過handler通知主線程提示使用者:
new Thread(new Runnable() {
@Override
public void run() {
while(isRecording) {
try {
voice_duration++;
if(MAX_DURATION - voice_duration < TIME_TO_COUNT_DOWN) {//開始進入倒計時10s
Message msg = handler.obtainMessage();
if(MAX_DURATION - voice_duration < 0) {//達到最大時長,停止錄音
msg.arg1 = stopRecoding();
msg.what = MessageActivity.VOICE_LONG;
voice_duration = 0;
handler.sendMessage(msg);
}
else {
msg.arg1 = MAX_DURATION - voice_duration;
msg.what = MessageActivity.VOICE_TIP;
handler.sendMessage(msg);
}
}
Thread.sleep(1000);//每隔1秒計時1次
}
catch(Exception e) {
e.printStackTrace();
}
}
}
}).start();
錄音完畢,需要停止并釋放recorder,計算錄音時間,儲存錄音檔案。
public int stopRecoding() {
if(this.recorder != null) {
this.isRecording = false;
this.voice_duration = 0;
this.recorder.stop();//停止錄音
this.recorder.release();//釋放錄音器
this.recorder = null;
int i = (int)(new Date().getTime() - this.startTime) / 1000;//計算錄音時間,并儲存至指定路徑
Log.e("voice", " voice recording finished. seconds:" + i + " file length:" + new File(this.voiceFilePath).length());
return i;
}
return 0;
}
播放語音消息,使用MediaPayer進行播放,步驟包括:設定報放音頻流類型、播放資料源、準備以及開始播放、設定播放完畢回調監聽:
((Activity)context).setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);
requestAudioFocus();
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_VOICE_CALL);//音頻流類型
try {
mediaPlayer.setDataSource(filePath);//播放資料源
mediaPlayer.prepare();//準備播放
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {//設定播放完畢的回調
// TODO Auto-generated method stub
mMediaPlayerCallback.onStop();
stopPlayVoice(); // stop animation
}
});
isPlaying = true;
playSource = filePath;
currentPlayListener = this;
mediaPlayer.start();//開始播放
mMediaPlayerCallback.onStart();
}
catch(Exception e) {
Log.d(TAG, "playErr--" + e.toString());
}
在播放過程中,使用者也許會暫停播放,那麼需要暫停目前MediaPlayer播放,并且記錄目前已播放的時長,以便下次續播:
public void stopPlayVoice() {
if(mediaPlayer != null) {
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
mMediaPlayerCallback.onStop();
}
abandonAudioFocus();
isPlaying = false;
}
播放模式切換,兩種模式:聽筒播放、揚聲器播放,并且在onStop()方法裡,應該把目前設定模式寫入sharePreference裡儲存起來,以便下次記住并調用設定後的播放模式。
mMediaPlayerCallback = callback;
AudioManager audioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
if(MessageActivity.outPlayMode) {//揚聲器播放
audioManager.setSpeakerphoneOn(true);
audioManager.setMode(AudioManager.MODE_NORMAL);
} else {//聽筒播放
audioManager.setSpeakerphoneOn(false);
audioManager.setMode(AudioManager.MODE_IN_CALL);
}
接收到的未讀語音消息,旁邊有小紅點提示:
private void handleAudioMessage(View view, ViewHolder holder, AudioMessage msg,int read) {
if (msg.getSendOrReceive() == Provider.MessageColumns.MSG_SEND) {//發送的語音消息
......
} else {//接收的語音消息
holder.imgVoiceReadTip = (ImageView) view.findViewById(R.id.img_voice_unread_tip);
if (read == Provider.MessageColumns.UNREAD_AUDIO) {
holder.imgVoiceReadTip.setVisibility(View.VISIBLE);//如果未讀,紅點顯示
} else {
holder.imgVoiceReadTip.setVisibility(View.GONE);//如果已讀,紅點消失
}
}
}
目前語音消息播放完畢,開一個子線程異步查詢是否有未讀語音消息,如果有就往下連續播放:
/**
* 通過輸入目前的messageId,查找後面是否有未讀的語音消息,如果有,傳回cursor的位置,沒有傳回-1;
*/
private int queryUnReadVoice(int id) {
Cursor cursor = mAdapter.getCursor();
boolean currentPosition = false;
int index = -1;
if (cursor != null) {
cursor.moveToFirst();
if (!cursor.isAfterLast()) {
do {
int message_id = cursor.getInt(cursor.getColumnIndex(Provider.MessageColumns._ID));
if (message_id == id) {
currentPosition = true;
continue;
}
if (currentPosition) {
int isRead = cursor.getInt(cursor.getColumnIndexOrThrow(Provider.MessageColumns._MESSAGE_READ));
if (isRead == Provider.MessageColumns.UNREAD_AUDIO) {
index = cursor.getPosition();
break;
}
}
} while (cursor.moveToNext());
}
}
return index;
}
/**
* 查詢到未讀語音消息id,通過handler發送消息通知主線程往下播放
* @param id
*/
private void continueToPlay(int id) {
int index = queryUnReadVoice(id);
if (index != -1) {
Message myMsg = Message.obtain();
myMsg.what = index;
handler.sendMessage(myMsg);
}
}
當handler收到消息後,往下播放語音消息,小紅點消失,未讀狀态置為已讀,并且把該消息狀态寫進資料庫:
private Handler handler = new Handler(Looper.getMainLooper()) {
@Override
public void handleMessage(Message msg) {
int index = msg.what;
View childView = mAdapter.getView(index, null, mListView);
AudioMessage message = (AudioMessage) childView.getTag();
ContentValues values = new ContentValues();
values.put(Provider.MessageColumns._MESSAGE_READ, Provider.MessageColumns.READ_AUDIO);
context.getApplicationContext().getContentResolver().update(Provider.MessageColumns.CONTENT_URI, values, Provider.MessageColumns._ID + "=?",
new String[]{message.getId() + ""});
mAdapter.notifyDataSetChanged();
childView.invalidate();
playAudio((ImageView) childView.findViewById(R.id.iv_audio), message);
}
};
錄音過程中,使用者可能又不想發送了,那麼應該提供取消錄音操作。這個可以在onTouchListener監聽器的onTouch方法裡設定,如果event.getAction() == MotionEvent.ACTION_MOVE,并且檢測到手勢是往上滑動,執行取消操作:
v.setPressed(true);
if (event.getY() < 0) {
// 上滑
notShowTip = true;
recordingHint.setText(getString(R.string.msg_voice_do_cancel_send_2));
recordingHint.setBackgroundResource(R.drawable.recording_text_hint_bg);
} else {
notShowTip = false;
if (VoiceRecorder.MAX_DURATION - voiceRecorder.voice_duration > VoiceRecorder.TIME_TO_COUNT_DOWN) {
recordingHint.setText(getString(R.string.msg_voice_do_cancel_send_1));
recordingHint.setBackgroundColor(Color.TRANSPARENT);
}
}
return true;<pre name="code" class="java">
當Activity失去焦點,回調onPause方法時,如果正在播放語音消息,應該暫停播放,如果正在錄音也應該暫停錄音:
@Override
protected void onPause() {
super.onPause();
audioPresenter.onPauseAudio();
try {
// 停止錄音
if (voiceRecorder.isRecording()) {
voiceRecorder.discardRecording();
recordingContainer.setVisibility(View.INVISIBLE);
}
} catch (Exception e) {
e.printStackTrace();
}
}
相關的權限:
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
好了,語音消息從錄音到發送再到接收播放的過程介紹完了。希望大家閱讀過後,對android系統的語音相關操作有更深刻了解與認識。如果有什麼問題,大家可以提出來互相探讨。下次對音頻管理器作進一步介紹,敬請期待。