Android：如何在SD卡中存储录制的音频

Question

我正在尝试使用以下代码录制音频。

public static final int CAPTURE_AUDIO = 0;
      ....
      ....

点击按钮，我有以下代码。

Intent intent = new Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION);
startActivityForResult(intent,CAPTURE_AUDIO);

因此它打开默认音频播放器并录制音频并存储在SD卡默认录制文件夹中。

所以一切都很顺利，但问题是我想把这个录音只存储在SD卡中，但是有一些其他的名字和其他文件夹，如

文件夹名称为 AudioRecording ，录制名称为 audio.mp3 ，我该怎么办呢。

我尝试了一些解决方案，但它对我不起作用。我知道这是一件容易的事，但有些我怎么也搞不清楚。任何建议都将受到高度赞赏..提前谢谢。

Answer 1

这里我添加了呼叫记录器示例源代码。请尝试让我知道。

<强> RecordService.java

import java.io.File;
import java.io.IOException;
import java.lang.Exception;
import java.util.Date;
import java.text.SimpleDateFormat;
import android.os.IBinder;
import android.app.Service;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.preference.PreferenceManager;
import android.content.SharedPreferences;
import android.content.Context;
import android.content.Intent;
import android.media.MediaRecorder;
import android.widget.Toast;
import android.util.Log;
import java.io.InputStream;
import java.io.FileInputStream;
import java.util.Iterator;

public class RecordService 
extends Service
implements MediaRecorder.OnInfoListener, MediaRecorder.OnErrorListener
{
private static final String TAG = "CallRecorder";

public static final String DEFAULT_STORAGE_LOCATION = "/sdcard/AudioRecording";
private static final int RECORDING_NOTIFICATION_ID = 1;
private MediaRecorder recorder = null;
private boolean isRecording = false;
private File recording = null;;
private final int audioformat = 3;


private File makeOutputFile (SharedPreferences prefs)
{
File dir = new File(DEFAULT_STORAGE_LOCATION);

// test dir for existence and writeability
if (!dir.exists()) {
    try {
        dir.mkdirs();
    } catch (Exception e) {
        Log.e("CallRecorder", "RecordService::makeOutputFile unable to create directory " + dir + ": " + e);
        Toast t = Toast.makeText(getApplicationContext(), "CallRecorder was unable to create the directory " + dir + " to store recordings: " + e, Toast.LENGTH_LONG);
        t.show();
        return null;
    }
} else {
    if (!dir.canWrite()) {
        Log.e(TAG, "RecordService::makeOutputFile does not have write permission for directory: " + dir);
        Toast t = Toast.makeText(getApplicationContext(), "CallRecorder does not have write permission for the directory directory " + dir + " to store recordings", Toast.LENGTH_LONG);
        t.show();
        return null;
    }
}

// test size

// create filename based on call data
String prefix = "call";
//SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd_HH:MM:SS");
//prefix = sdf.format(new Date()) + "-callrecording";

// add info to file name about what audio channel we were recording
prefix += "-channel" + 1 + "-";

// create suffix based on format
String suffix = "";
switch (audioformat) {
case MediaRecorder.OutputFormat.THREE_GPP:
    suffix = ".3gpp";
    break;
case MediaRecorder.OutputFormat.MPEG_4:
    suffix = ".mpg";
    break;
case MediaRecorder.OutputFormat.RAW_AMR:
    suffix = ".amr";
    break;
}

try {
    return File.createTempFile(prefix, suffix, dir);
} catch (IOException e) {
    Log.e("CallRecorder", "RecordService::makeOutputFile unable to create temp file in " + dir + ": " + e);
    Toast t = Toast.makeText(getApplicationContext(), "CallRecorder was unable to create temp file in " + dir + ": " + e, Toast.LENGTH_LONG);
    t.show();
    return null;
}
}

public void onCreate()
{
super.onCreate();
recorder = new MediaRecorder();
Log.i("CallRecorder", "onCreate created MediaRecorder object");
}

public void onStart(Intent intent, int startId) {
Log.i("CallRecorder", "RecordService::onStartCommand called while isRecording:" + isRecording);

if (isRecording) return;

Context c = getApplicationContext();
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(c);

Boolean shouldRecord = prefs.getBoolean(Preferences.PREF_RECORD_CALLS, false);
if (!shouldRecord) {
    Log.i("CallRecord", "RecordService::onStartCommand with PREF_RECORD_CALLS false, not recording");
    //return START_STICKY;
    return;
}
recording = makeOutputFile(prefs);
if (recording == null) {
    recorder = null;
    return; //return 0;
}

   try {
    // These calls will throw exceptions unless you set the 
    // android.permission.RECORD_AUDIO permission for your app
    recorder.reset();
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(audioformat);
    Log.d("CallRecorder", "set output " + audioformat);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
    Log.d("CallRecorder", "set encoder default");
    recorder.setOutputFile(recording.getAbsolutePath());
    Log.d("CallRecorder", "set file: " + recording);
    //recorder.setMaxDuration(msDuration); //1000); // 1 seconds
    //recorder.setMaxFileSize(bytesMax); //1024*1024); // 1KB

    recorder.setOnInfoListener(this);
    recorder.setOnErrorListener(this);

    try {
        recorder.prepare();
    } catch (java.io.IOException e) {
        Log.e("CallRecorder", "RecordService::onStart() IOException attempting recorder.prepare()\n");
        Toast t = Toast.makeText(getApplicationContext(), "CallRecorder was unable to start recording: " + e, Toast.LENGTH_LONG);
        t.show();
        recorder = null;
        return; //return 0; //START_STICKY;
    }
    Log.d("CallRecorder", "recorder.prepare() returned");

    recorder.start();
    isRecording = true;
    Log.i("CallRecorder", "recorder.start() returned");
    updateNotification(true);
} catch (java.lang.Exception e) {
    Toast t = Toast.makeText(getApplicationContext(), "CallRecorder was unable to start recording: " + e, Toast.LENGTH_LONG);
    t.show();

    Log.e("CallRecorder", "RecordService::onStart caught unexpected exception", e);
    recorder = null;
}

return; //return 0; //return START_STICKY;
}

public void onDestroy()
{
super.onDestroy();

if (null != recorder) {
    Log.i("CallRecorder", "RecordService::onDestroy calling recorder.release()");
    isRecording = false;
    recorder.release();
    Toast t = Toast.makeText(getApplicationContext(), "CallRecorder finished recording call to " + recording, Toast.LENGTH_LONG);
    t.show();
}

updateNotification(false);
}


// methods to handle binding the service

public IBinder onBind(Intent intent)
{
return null;
}

public boolean onUnbind(Intent intent)
{
return false;
}

public void onRebind(Intent intent)
{
}


private void updateNotification(Boolean status)
{
Context c = getApplicationContext();
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(c);

String ns = Context.NOTIFICATION_SERVICE;
NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);

if (status) {
    int icon = R.drawable.rec;
    CharSequence tickerText = "Recording call from channel " + prefs.getString(Preferences.PREF_AUDIO_SOURCE, "1");
    long when = System.currentTimeMillis();

    Notification notification = new Notification(icon, tickerText, when);

    Context context = getApplicationContext();
    CharSequence contentTitle = "CallRecorder Status";
    CharSequence contentText = "Recording call from channel...";
    Intent notificationIntent = new Intent(this, RecordService.class);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

    notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
    mNotificationManager.notify(RECORDING_NOTIFICATION_ID, notification);
} else {
    mNotificationManager.cancel(RECORDING_NOTIFICATION_ID);
}
}

// MediaRecorder.OnInfoListener
public void onInfo(MediaRecorder mr, int what, int extra)
{
Log.i("CallRecorder", "RecordService got MediaRecorder onInfo callback with what: " + what + " extra: " + extra);
isRecording = false;
}

// MediaRecorder.OnErrorListener
public void onError(MediaRecorder mr, int what, int extra) 
{
Log.e("CallRecorder", "RecordService got MediaRecorder onError callback with what: " + what + " extra: " + extra);
isRecording = false;
mr.release();
}
}

<强> PhoneListener.java

import android.content.Intent;
import android.content.Context;
import android.content.ComponentName;
import android.telephony.TelephonyManager;
import android.telephony.PhoneStateListener;
import android.util.Log;

public class PhoneListener extends PhoneStateListener
{
private Context context;

public PhoneListener(Context c) {
Log.i("CallRecorder", "PhoneListener constructor");
context = c;
}

public void onCallStateChanged (int state, String incomingNumber)
{
Log.d("CallRecorder", "PhoneListener::onCallStateChanged state:" + state + " incomingNumber:" + incomingNumber);

switch (state) {
case TelephonyManager.CALL_STATE_IDLE:
    Log.d("CallRecorder", "CALL_STATE_IDLE, stoping recording");
    Boolean stopped = context.stopService(new Intent(context, RecordService.class));
    Log.i("CallRecorder", "stopService for RecordService returned " + stopped);
    break;
case TelephonyManager.CALL_STATE_RINGING:
    Log.d("CallRecorder", "CALL_STATE_RINGING");
    break;
case TelephonyManager.CALL_STATE_OFFHOOK:
    Log.d("CallRecorder", "CALL_STATE_OFFHOOK starting recording");
    Intent callIntent = new Intent(context, RecordService.class);
    ComponentName name = context.startService(callIntent);
    if (null == name) {
        Log.e("CallRecorder", "startService for RecordService returned null ComponentName");
    } else {
        Log.i("CallRecorder", "startService returned " + name.flattenToString());
    }
    break;
}
}
}

希望它对你有用。它对我来说很好。请尝试让我知道。欲了解更多信息，请下载示例代码表

Call Recorder

Answer 2

我认为实现此目的的最佳方法是将该音频转换为byte[]数组。假设你已经这样做了，这应该有效：

final File soundFile = new File("/sdcard/AudioRecording/");
soundFile.mkdirs();
final File outFile = new File(soundFile, 'audiofile.mp3');

try {
  final FileOutputStream output = new FileOutputStream(outFile);
  output.write(yourByteArrayWithYourAudioFileConverted);
  output.close();
} catch (FileNotFoundException e) {
  e.printStackTrace();
} catch (IOException e) {
  e.printStackTrace();
}

可能不是你的情况，但mkdirs()方法会尝试构建所有父目录，如果它们丢失了。在您的情况下，您可能确保用户有外部卡，这不是必需的（因为根目录是/sdcard），但如果您计划将文件存储在更高的目录深度中所以它会自动创建所有层次结构。