MediaRecorder si arresta in modo anomalo quando si registra un secondo clip audio

Question

Sto provando a registrare clip audio con MediaRecorder, ma continuo a ricevere questi errori nel logcat quando avvio, interrompo e ricomincio; l'attività sarebbe anche vicino:

INFO/DEBUG(1285): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** 
INFO/DEBUG(1285): Build fingerprint: 'LGE/thunderg/thunderg/thunderg:2.2.1/FRG83/eng.nikech.choi.20110126.134422:user/release-keys' 
INFO/DEBUG(1285): signal 11 (SIGSEGV), fault addr 00000010 
INFO/DEBUG(1285): r0 00000000 r1 00000000 r2 a930cc98 r3 00000001 
…… 
INFO/DEBUG(1285):   #00 pc 00033c28 /system/lib/libmedia.so 
INFO/DEBUG(1285):   #01 pc 0000780e /system/lib/libmedia_jni.so 
…… 
INFO/DEBUG(1285): code around pc: 
INFO/DEBUG(1285): a9033c08 2001e001 1c1861a0 46c0bd70 00029a58 
…… 
INFO/DEBUG(1285): code around lr: 
INFO/DEBUG(1285): a93077f0 f7ffb510 bd10ffcf b082b570 ae011c05 
…… 
INFO/DEBUG(1285): stack: 
INFO/DEBUG(1285):  bef054d0 00000001 
…… 

Una clip audio viene registrato e possono essere riprodotti sul computer, ma se voglio registrare un altro, quanto sopra accade. Ho già chiesto il permesso nel manifesto:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission> 
<uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission> 

Ho usato questo codice da Ben McCann:

import java.io.File; 
import java.io.IOException; 

import android.media.MediaRecorder; 
import android.os.Environment; 

/** 
* @author <a href="http://www.benmccann.com">Ben McCann</a> 
*/ 

public class AudioRecorder { 

    final MediaRecorder recorder = new MediaRecorder(); 
    final String path; 

    /** 
    * Creates a new audio recording at the given path (relative to root of SD card). 
    */ 
    public AudioRecorder(String path) { 
    this.path = sanitizePath(path); 
    } 

    private String sanitizePath(String path) { 
    if (!path.startsWith("/")) { 
     path = "/" + path; 
    } 
    if (!path.contains(".")) { 
     path += ".3gp"; 
    } 
    return Environment.getExternalStorageDirectory().getAbsolutePath() + path; 
    } 

    /** 
    * Starts a new recording. 
    */ 
    public void start() throws IOException { 
    String state = android.os.Environment.getExternalStorageState(); 
    if(!state.equals(android.os.Environment.MEDIA_MOUNTED)) { 
     throw new IOException("SD Card is not mounted. It is " + state + "."); 
    } 

    // make sure the directory we plan to store the recording in exists 
    File directory = new File(path).getParentFile(); 
    if (!directory.exists() && !directory.mkdirs()) { 
     throw new IOException("Path to file could not be created."); 
    } 

    recorder.reset(); 
    System.out.println("reset"); 
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
    System.out.println("setAudioSource"); 
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
    System.out.println("setOutputFormat"); 
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 
    System.out.println("setAudioEncoder"); 
    recorder.setOutputFile(path); 
    System.out.println("setOutputFile"); 
    recorder.prepare(); 
    System.out.println("prepare"); 
    recorder.start(); 
    System.out.println("start"); 
    } 

    /** 
    * Stops a recording that has been previously started. 
    */ 
    public void stop() throws IOException { 
    recorder.stop(); 
    System.out.println("stopped"); 
    recorder.release(); 
    System.out.println("released"); 
    } 

} 

Il mio codice:

import java.io.IOException; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.Toast; 

public class TestActivity extends Activity implements OnClickListener { 

    private final String TAG = TestActivity.class.getSimpleName(); 

    Button startRecord; 
    Button stopRecord; 
    boolean recordStarted = false; 
    private static String fileName = "/Recordings/event.3gp"; 
    AudioRecorder audioRecorder; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.record); 

     startRecord = (Button)findViewById(R.id.buttonStartRecord); 
     stopRecord = (Button)findViewById(R.id.buttonStopRecord); 

     startRecord.setOnClickListener(this); 
     stopRecord.setOnClickListener(this); 
     audioRecorder = new AudioRecorder(fileName); 
    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     Log.d(TAG, "resumed"); 
    } 

    @Override 
    protected void onPause() { 
    super.onPause(); 
    Log.d(TAG, "paused"); 
    } 

    @Override 
    public void onClick(View v) { 
     if (v == startRecord){ 
      try { 
       audioRecorder.start(); 
       Toast.makeText(this, R.string.msgRecordSuccessful, 
        Toast.LENGTH_SHORT).show(); 
       recordStarted = true; 
       Log.e(TAG, String.format("recording: %s", recordStarted)); 
      } catch (IOException e) { 
       e.printStackTrace(); 
       Toast.makeText(this, R.string.msgRecordFail, Toast.LENGTH_SHORT).show(); 
      } 
     } else if (v == stopRecord){ 
      if (recordStarted == true) { 
       try { 
        audioRecorder.stop(); 
        recordStarted = false; 
        Log.e(TAG, String.format("recording: %s", recordStarted)); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 
      } else { 
       Toast.makeText(this, R.string.msgNotRecording, Toast.LENGTH_SHORT).show(); 
      } 
     } 
    } // end onClick 

} 

XML:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
    <Button android:layout_width="wrap_content" 
     android:layout_height="wrap_content" android:text="start" 
     android:id="@+id/buttonStartRecord"></Button> 
    <Button android:layout_width="wrap_content" 
     android:layout_height="wrap_content" android:id="@+id/buttonStopRecord" 
     android:text="Stop"></Button> 

</LinearLayout> 

Corde:

<string name="msgReset">reset</string> 
<string name="msgSetAudioSource">setAudioSource</string> 
<string name="msgSetOutputFormat">setOutputFormat</string> 
<string name="msgSetAudioEncoder">setAudioEncoder</string> 
<string name="msgSetOutputFile">setOutputFile</string> 
<string name="msgPrepare">prepare</string> 
<string name="msgStart">start</string> 

Non ho molta esperienza di programmazione e non ho idea di cosa significhi o di come sia possibile cercare questo problema in Google ... se qualcuno può indicarmi una direzione generale che sarebbe veramente bello: D

Grazie !!

aggiornamenti ------------ ---------------

@ Tim le poche righe dopo il blocco di debug da logcat:

INFO/ActivityManager(1362): Process com.bcit.chairlogger (pid 26461) has died. 
INFO/WindowManager(1362): WIN DEATH: Window{44f04e20 com.bcit.chairlogger/com.bcit.chairlogger.TestActivity paused=false} 
INFO/ActivityManager(1362): Displayed activity com.bcit.chairlogger/.TestActivity: 106629 ms (total 106629 ms) 
INFO/UsageStats(1362): Unexpected resume of com.lge.launcher while already resumed in com.bcit.chairlogger 
WARN/Flex(1456): getString FLEX_OPERATOR_CODE TLS 
WARN/Flex(1456): getString FLEX_OPERATOR_CODE TLS 
INFO/#LGIME(1442): #### onStartInput: restarting=false, fieldId=-1 
WARN/InputManagerService(1362): Got RemoteException sending setActive(false) notification to pid 26461 uid 10071 

Answer 1

Si è scoperto che era dovuto alla classe AudioRecorder. Poiché il nuovo oggetto MediaRecorder viene creato all'inizio della classe anziché nel metodo "start", l'oggetto viene rilasciato ogni volta nel metodo "stop", rendendolo inutilizzabile.

Answer 2

ho avuto lo stesso errore, soluzione che ha funzionato per me "E MediaRecorder recorder = new MediaRecorder(); all'inizio di start()" (Several audio recording in Android)

Answer 3

Ho risolto questo problema aggiungendo il registratore di funzionalità di arresto.

È necessario aggiungere questo codice a 4 righe all'interno stop() solo allora si può iniziare il secondo clip audio:

myRecorder = new MediaRecorder(); 
     myRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
     myRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
     myRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB); 
     myRecorder.setOutputFile(outputFile); 

riferimento sottostante Codice:

public void stop(View view) { 
    try { 
     myRecorder.stop(); 
     myRecorder.reset(); 
     myRecorder.release(); 

     stopBtn.setEnabled(false); 
     playBtn.setEnabled(true); 
     startBtn.setEnabled(true); 


     myRecorder = new MediaRecorder(); 
     myRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
     myRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
     myRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB); 
     myRecorder.setOutputFile(outputFile); 


    } catch (IllegalStateException e) { 
     // it is called before start() 
     e.printStackTrace(); 
    } catch (RuntimeException e) { 
     // no valid audio/video data has been received 
     e.printStackTrace(); 
    } 
}