我正在尝试使用媒体录制器录制语音。 现在我创建了新的媒体记录器然后我尝试使用准备并开始无济于事，我总是收到以下错误：
09-04 09:27:36.335: E/MediaRecorder(26320): prepare failed: -17
09-04 09:27:36.335: W/System.err(26320): java.io.IOException: prepare failed.
09-04 09:27:36.350: W/System.err(26320): at android.media.MediaRecorder._prepare(Native Method)
09-04 09:27:36.350: W/System.err(26320): at android.media.MediaRecorder.prepare(MediaRecorder.java:595)
09-04 09:27:36.350: W/System.err(26320): at com.abg.quickies.AudioRecorder.start(AudioRecorder.java:57)
09-04 09:27:36.350: W/System.err(26320): at com.abg.quickies.ServiceFloatingButton.recordCall(ServiceFloatingButton.java:321)
09-04 09:27:36.350: W/System.err(26320): at com.abg.quickies.ServiceFloatingButton.handlePressAction(ServiceFloatingButton.java:254)
09-04 09:27:36.350: W/System.err(26320): at com.abg.quickies.ServiceFloatingButton.access$1(ServiceFloatingButton.java:217)
09-04 09:27:36.350: W/System.err(26320): at com.abg.quickies.ServiceFloatingButton$1.onTouch(ServiceFloatingButton.java:173)
09-04 09:27:36.350: W/System.err(26320): at android.view.View.dispatchTouchEvent(View.java:3934)
09-04 09:27:36.355: W/System.err(26320): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
09-04 09:27:36.355: W/System.err(26320): at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2218)
09-04 09:27:36.355: W/System.err(26320): at android.view.ViewRoot.handleMessage(ViewRoot.java:1889)
09-04 09:27:36.360: W/System.err(26320): at android.os.Handler.dispatchMessage(Handler.java:99)
09-04 09:27:36.360: W/System.err(26320): at android.os.Looper.loop(Looper.java:123)
09-04 09:27:36.360: W/System.err(26320): at android.app.ActivityThread.main(ActivityThread.java:3691)
09-04 09:27:36.360: W/System.err(26320): at java.lang.reflect.Method.invokeNative(Native Method)
09-04 09:27:36.365: W/System.err(26320): at java.lang.reflect.Method.invoke(Method.java:507)
09-04 09:27:36.365: W/System.err(26320): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
09-04 09:27:36.365: W/System.err(26320): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
09-04 09:27:36.370: W/System.err(26320): at dalvik.system.NativeStart.main(Native Method)
代码如下：
private void recordCall()
{
Parameters params=getMyApplication().get_parameters();
Date date=new Date();
SimpleDateFormat formater=new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
String fileName=formater.format(date);
String path=params.getRecordsPath()+fileName;
//record
set_recorder(new AudioRecorder(path));
try {
get_recorder().start();
set_isRecording(true);
showRecorderNotification();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
录音机：
public class AudioRecorder {
final MediaRecorder recorder = new MediaRecorder();
final String path;
private int _audioSource;
/**
* Creates a new audio recording at the given path (relative to root of SD card).
* default audio source is voicecall
*/
public AudioRecorder(String path) {
this.path = sanitizePath(path);
set_audioSource(MediaRecorder.AudioSource.VOICE_CALL);
}
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 {
Log.i("GABI", "AudioRecorder- start()");
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.setAudioSource(get_audioSource());
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(path);
recorder.prepare();
recorder.start();
}
/**
* Stops a recording that has been previously started.
*/
public void stop() throws IOException {
Log.i("GABI", "AudioRecorder- stop()");
recorder.stop();
recorder.reset();
recorder.release();
}
public int get_audioSource() {
return _audioSource;
}
public void set_audioSource(int _audioSource) {
this._audioSource = _audioSource;
}
}
为什么会这样？
答案 0 :(得分：0)
尝试将VOICE_CALL更改为MIC。此外，如果它不起作用，您可以检查这部分代码。经过测试和运作。
/*
* The application needs to have the permission to write to external storage
* if the output file is written to the external storage, and also the
* permission to record audio. These permissions must be set in the
* application's AndroidManifest.xml file, with something like:
*
* <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
* <uses-permission android:name="android.permission.RECORD_AUDIO" />
*
*/
package com.android.audiorecordtest;
import android.app.Activity;
import android.widget.LinearLayout;
import android.os.Bundle;
import android.os.Environment;
import android.view.ViewGroup;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.Context;
import android.util.Log;
import android.media.MediaRecorder;
import android.media.MediaPlayer;
import java.io.IOException;
public class AudioRecordTest extends Activity
{
private static final String LOG_TAG = "AudioRecordTest";
private static String mFileName = null;
private RecordButton mRecordButton = null;
private MediaRecorder mRecorder = null;
private PlayButton mPlayButton = null;
private MediaPlayer mPlayer = null;
private void onRecord(boolean start) {
if (start) {
startRecording();
} else {
stopRecording();
}
}
private void onPlay(boolean start) {
if (start) {
startPlaying();
} else {
stopPlaying();
}
}
private void startPlaying() {
mPlayer = new MediaPlayer();
try {
mPlayer.setDataSource(mFileName);
mPlayer.prepare();
mPlayer.start();
} catch (IOException e) {
Log.e(LOG_TAG, "prepare() failed");
}
}
private void stopPlaying() {
mPlayer.release();
mPlayer = null;
}
private void startRecording() {
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mRecorder.setOutputFile(mFileName);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
try {
mRecorder.prepare();
} catch (IOException e) {
Log.e(LOG_TAG, "prepare() failed");
}
mRecorder.start();
}
private void stopRecording() {
mRecorder.stop();
mRecorder.release();
mRecorder = null;
}
class RecordButton extends Button {
boolean mStartRecording = true;
OnClickListener clicker = new OnClickListener() {
public void onClick(View v) {
onRecord(mStartRecording);
if (mStartRecording) {
setText("Stop recording");
} else {
setText("Start recording");
}
mStartRecording = !mStartRecording;
}
};
public RecordButton(Context ctx) {
super(ctx);
setText("Start recording");
setOnClickListener(clicker);
}
}
class PlayButton extends Button {
boolean mStartPlaying = true;
OnClickListener clicker = new OnClickListener() {
public void onClick(View v) {
onPlay(mStartPlaying);
if (mStartPlaying) {
setText("Stop playing");
} else {
setText("Start playing");
}
mStartPlaying = !mStartPlaying;
}
};
public PlayButton(Context ctx) {
super(ctx);
setText("Start playing");
setOnClickListener(clicker);
}
}
public AudioRecordTest() {
mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
mFileName += "/audiorecordtest.3gp";
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
LinearLayout ll = new LinearLayout(this);
mRecordButton = new RecordButton(this);
ll.addView(mRecordButton,
new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT,
0));
mPlayButton = new PlayButton(this);
ll.addView(mPlayButton,
new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT,
0));
setContentView(ll);
}
@Override
public void onPause() {
super.onPause();
if (mRecorder != null) {
mRecorder.release();
mRecorder = null;
}
if (mPlayer != null) {
mPlayer.release();
mPlayer = null;
}
}
}