每当按下开始按钮，我的应用程序就崩溃了。 Logcat说它因为启动方法失败了。我谷歌错误，但我没有找到任何东西。它在本机方法Start（v）;
中给出异常这是我的logcat：
08-22 18:44:23.420: E/MediaRecorder(3607): start failed: -2147483648
08-22 18:44:23.420: V/MediaRecorderJNI(3607): process_media_recorder_call
08-22 18:44:23.420: W/dalvikvm(3607): threadid=1: thread exiting with uncaught exception (group=0x41234438)
08-22 18:44:23.420: E/AndroidRuntime(3607): FATAL EXCEPTION: main
08-22 18:44:23.420: E/AndroidRuntime(3607): java.lang.RuntimeException: start failed.
这是我的代码：
import java.io.File;
import java.io.IOException;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.media.SoundPool;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private MediaRecorder myRecorder;
private MediaPlayer myPlayer;
private File outputFile = null;
private AudioTrack mAudioTrack;
private Button startBtn;
private Button stopBtn;
private Button playBtn;
private Button stopPlayBtn;
private Spinner sp;
private TextView text;
public SoundPool spl;
public int explosion = 0;
private Button playMod;
private int sampleRate = 8000;
private Uri newUri;
AudioManager audioManager;
int counter;
float actVolume, maxVolume, volume;
boolean loaded = false;
private static final String TAG = "SoundRecordingActivity";
String [] singers = {"Atif Aslam" , "Arijit Singh" , "Shreya Goshal"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (TextView) findViewById(R.id.text1);
sp = (Spinner)findViewById(R.id.spinner1);
ArrayAdapter<String> adp=new ArrayAdapter<String>(this,
android.R.layout.simple_dropdown_item_1line,singers);
adp.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
sp.setAdapter(adp);
// store it to sd card
//outFile = Environment.getExternalStorageDirectory().
// getAbsolutePath() + "/AudioRecord.3gpp";
File sampleDir = Environment.getExternalStorageDirectory();
try {
outputFile = File.createTempFile("sound", ".m4a", sampleDir);
} catch (IOException e) {
Toast.makeText(this, "No Memory Card Inserted", Toast.LENGTH_LONG).show();
Log.e(TAG, "sdcard access error");
return;
}
myRecorder = new MediaRecorder();
myRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
myRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
myRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
myRecorder.setOutputFile(outputFile.getAbsolutePath());
startBtn = (Button)findViewById(R.id.start);
startBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
start(v);
}
});
stopBtn = (Button)findViewById(R.id.stop);
stopBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
stop(v);
}
});
playBtn = (Button)findViewById(R.id.play);
playBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
play(v);
}
});
stopPlayBtn = (Button)findViewById(R.id.stopPlay);
stopPlayBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
stopPlay(v);
}
});
playMod = (Button)findViewById(R.id.button1);
playMod.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
playModified(v);
}
});
}
public void start(View view){
try {
myRecorder.prepare();
myRecorder.start();
} catch (IllegalStateException e) {
// start:it is called before prepare()
// prepare: it is called after start() or before setOutputFormat()
e.printStackTrace();
} catch (IOException e) {
// prepare() fails
e.printStackTrace();
}
text.setText("Recording Point: Recording");
startBtn.setEnabled(false);
stopBtn.setEnabled(true);
Toast.makeText(getApplicationContext(), "Start recording...",
Toast.LENGTH_SHORT).show();
}
public void stop(View view){
try {
myRecorder.stop();
myRecorder.release();
myRecorder = null;
stopBtn.setEnabled(false);
playBtn.setEnabled(true);
text.setText("Recording Point: Stop recording");
Toast.makeText(getApplicationContext(), "Stop recording...",
Toast.LENGTH_SHORT).show();
/////////////////////////////////////
// addRecordingToMediaLibrary();
//////////////////////////////////////
} catch (IllegalStateException e) {
// it is called before start()
e.printStackTrace();
} catch (RuntimeException e) {
// no valid audio/video data has been received
e.printStackTrace();
}
}
public void play(View view) {
try{
myPlayer = new MediaPlayer();
myPlayer.setDataSource(outputFile.getAbsolutePath());
myPlayer.prepare();
myPlayer.start();
playBtn.setEnabled(false);
stopPlayBtn.setEnabled(true);
text.setText("Recording Point: Playing");
Toast.makeText(getApplicationContext(), "Start play the recording...",
Toast.LENGTH_SHORT).show();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void stopPlay(View view) {
try {
if (myPlayer != null) {
myPlayer.stop();
myPlayer.release();
myPlayer = null;
playBtn.setEnabled(true);
stopPlayBtn.setEnabled(false);
text.setText("Recording Point: Stop playing");
Toast.makeText(getApplicationContext(), "Stop playing the recording...",
Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
将临时文件保存为类型m4a：
outputFile = File.createTempFile("sound", ".m4a", sampleDir);
但输出格式错误（3gp）：
myRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
<强>解决方案：
如果您想将录制的文件保存为3gp格式，则必须将文件另存为：
outputFile = File.createTempFile("sound", ".3gp", sampleDir);
否则，如果您想以m4a格式保存，则必须按如下方式更改输出格式：
myRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
这里有list个可用格式
答案 1 :(得分：0)
我有同样的问题。因为我也有MediaPlayer，所以可以通过以下代码解决此问题：
mediaPlayer.setAudioStreamType(AudioManager.ADJUST_LOWER);
这解决了我的问题。