如何解决媒体记录器的声音质量较差
我想做的是在将声音上传到Firebase之后录制声音 然后检索到reciclerview我可以控制 播放/停止和进度。像whatsApp语音消息一样
在Main活动中通过按下a来调用AudioPlayer类 按钮并返回值以将文件上传到firebase中。 但音质非常差，只能在浏览器或 直接在源文件夹中，否则我无法以其他格式播放它 当我直接在源文件夹中播放THREE_GPP时。
public class StartRecordMessage extends AppCompatActivity implements Runnable {
private static String fileName = null;
private MediaRecorder myAudioRecorder;
private MediaPlayer player = null;
private boolean permissionToRecordAccepted = false;
private String[] permissions = {Manifest.permission.RECORD_AUDIO};
private final String TAG = "StartRecordMessageClass";
private String audioName = null;
private String externalStoragePath,externalOutputPath,storagePath;
public StartRecordMessage(MediaRecorder myAudioRecorder) {
this.myAudioRecorder = myAudioRecorder;
}
@Override
public void run() {
startRecording();
}
public String startRecording (){
myAudioRecorder = new MediaRecorder();
myAudioRecorder.reset();
myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
myAudioRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
{
externalStoragePath = Environment.getExternalStorageDirectory().getAbsolutePath();
externalOutputPath = externalStoragePath + File.separator + "/Android/data/test.mp3";
myAudioRecorder.setOutputFile(externalOutputPath);
}
else
{
storagePath = Environment.getDataDirectory().getAbsolutePath();
myAudioRecorder.setOutputFile(storagePath + "/Android/data/test.mp3");
}
try {
Log.i(TAG,"--------------recording started confirmed" + externalOutputPath + storagePath );
myAudioRecorder.prepare();
myAudioRecorder.start();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (externalOutputPath.isEmpty()){
return storagePath;
}else {
return externalOutputPath;
}
}
关注方法在主要活动中
@Override
public void onRecordingCompleted() {
Log.i(TAG,"---------completed");
startThread = new Thread(new StartRecordMessage(myAudioRecorder));
startThread.start();
startRecordMessage = new StartRecordMessage(myAudioRecorder);
audioMessage = startRecordMessage.startRecording();
Log.i(TAG,"recordingCompleted--------------" + audioMessage);
UploadSound(audioMessage);
}
messageListAdapter.notifyDataSetChanged();
}
AudioPlayerClass
public class AudioPlayer {
public static void play(Context ctx,String path) {
try {
final AudioManager audioManager = (AudioManager) ctx.getSystemService(Context.AUDIO_SERVICE);
final int currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
final MediaPlayer mediaPlayer = MediaPlayer.create(ctx,Uri.parse(path));
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
if (!audioManager.isWiredHeadsetOn()) {
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,currentVolume,AudioManager.FLAG_VIBRATE);
}
mp.release();
}
});
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
if (!audioManager.isWiredHeadsetOn()) {
int volume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC) / 2;
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,volume,AudioManager.FLAG_VIBRATE);
}
mp.start();
}
});
} catch(
Throwable e)
{
Log.i("AudioUtil","Unable to play: " + path,e);
}
}
}
AdapterClass
holder.playStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
clickCount++;
if (clickCount==1) {
isPlayng=true;
holder.playStop.setBackgroundResource(R.drawable.ic_pause);
Log.i(TAG,"audio url---------------" + audio);
audioPlayer = new AudioPlayer();
audioPlayer.play(context,audio);
Log.i(TAG,"Media player ------------"+ clickCount + " is play: " +isPlayng);
}
if (clickCount>1){
isPlayng=false;
clickCount=0;
holder.playStop.setBackgroundResource(R.drawable.ic_play);
Log.i(TAG,"Media player ------------" + clickCount + " is play: " + isPlayng);
}
}
});
当我想播放声音时，将触发跟随错误。班级 在Adapter类中调用了音频播放器类，但问题是 网址。
https://firebasestorage.googleapis.com/v0/b/chat-b18d3.appspot.com/o/Audio%....。 2020-11-12 22：59：44.739 2621-2621 I / AudioUtil：无法播放：https://firebasestorage.googleapis.com/v0/b/chat-b18d3.appspot.com/o/Audio%....。 java.lang.NullPointerException：尝试调用虚拟方法'java.lang.Object android.content.Context.getSystemService（java.lang.String）'上的null 对象参考 在com.example .... ChatRecord.AudioPlayer.play（AudioPlayer.java:13） 在com.example.chatMapOriginal.Profile.Chat.MyGroups.GroupChatAdapter $ 1.onClick（GroupChatAdapter.java:137） 在android.view.View.performClick（View.java:7192） 在android.view.View.performClickInternal（View.java:7166） 在android.view.View.access $ 3500（View.java:824） 在android.view.View $ PerformClick.run（View.java:27592） 在android.os.Handler.handleCallback（Handler.java:888） 在android.os.Handler.dispatchMessage（Handler.java:100） 在android.os.Looper.loop（Looper.java:213） 在android.app.ActivityThread.main（ActivityThread.java:8178） 在java.lang.reflect.Method.invoke（本机方法） 在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:513） 在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1101）
解决方法
尝试在媒体文件中添加值。
例如。
// Setup values for the media file
ContentValues values = new ContentValues(4);
long current = System.currentTimeMillis();
values.put(MediaStore.Audio.Media.TITLE,"audio file");
values.put(MediaStore.Audio.Media.DATE_ADDED,(int) (current / 1000));
values.put(MediaStore.Audio.Media.MIME_TYPE,"audio/3gpp");
values.put(MediaStore.Audio.Media.DATA,audiofile.getAbsolutePath());
ContentResolver contentResolver = getContentResolver();
// Construct uris
Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Uri newUri = contentResolver.insert(base,values);
// Trigger broadcast to add
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,newUri));
Toast.makeText(this,"Added File " + newUri,Toast.LENGTH_LONG).show();
此代码来自here
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