Java 通过MediaRecorder录制音频

我试图通过MediaRecorder录制音频，但我遇到了一个错误，我试图更改所有内容，但没有任何效果。在过去的两个小时里，我试图找到这个错误，我也使用了Log类，我发现这个错误是在它调用recorder.start（）方法时发生的。有什么问题吗

public class AudioRecorderActivity extends Activity {

MediaRecorder recorder;
File audioFile = null;
private static final String TAG = "AudioRecorderActivity";
private View startButton;
private View stopButton;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    startButton = findViewById(R.id.start);
    stopButton = findViewById(R.id.stop);

    setContentView(R.layout.main);
}

public void startRecording(View view) throws IOException{

    startButton.setEnabled(false);
    stopButton.setEnabled(true);

    File sampleDir = Environment.getExternalStorageDirectory();

    try{
        audioFile = File.createTempFile("sound", ".3gp", sampleDir);
    }catch(IOException e){
        Toast.makeText(getApplicationContext(), "SD Card Access Error", Toast.LENGTH_LONG).show();
        Log.e(TAG, "Sdcard access error");
        return;
    }

    recorder = new MediaRecorder();
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    recorder.setAudioEncodingBitRate(16);
    recorder.setAudioSamplingRate(44100);
    recorder.setOutputFile(audioFile.getAbsolutePath());
    recorder.prepare();
    recorder.start();
}

public void stopRecording(View view){
    startButton.setEnabled(true);
    stopButton.setEnabled(false);
    recorder.stop();
    recorder.release();
    addRecordingToMediaLibrary();
}

protected void addRecordingToMediaLibrary(){
    ContentValues values = new ContentValues(4);
    long current = System.currentTimeMillis();
    values.put(MediaStore.Audio.Media.TITLE, "audio" + audioFile.getName());
    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();

    Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    Uri newUri = contentResolver.insert(base, values);

    sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri));
    Toast.makeText(this, "Added File" + newUri, Toast.LENGTH_LONG).show();
    }

} 

这里是xml布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/RelativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
    android:id="@+id/start"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="146dp"
    android:onClick="startRecording"
    android:text="Start Recording" />

<Button
    android:id="@+id/stop"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/start"
    android:layout_below="@+id/start"
    android:layout_marginTop="41dp"
    android:enabled="false"
    android:onClick="stopRecording"
    android:text="Stop Recording" />

 </RelativeLayout>

我需要录制高质量的音频

---

谢谢

我没有花时间对您的代码进行bug搜索，但这段代码很有效：

public class ExampleActivity extends Activity implements OnClickListener {
private Button startButton;
private Button stopButton;
private MediaRecorder mediaRecorder;
private File audioFile;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_layout);
    startButton = (Button) findViewById(R.id.button1);
    startButton.setOnClickListener(this);
    startButton.setText("start");

    stopButton = (Button) findViewById(R.id.button2);
    stopButton.setOnClickListener(this);
    stopButton.setEnabled(false);
    stopButton.setText("stop");

    audioFile = new File(Environment.getExternalStorageDirectory(),
            "audio_test4.3gp");
}

// this process must be done prior to the start of recording
private void resetRecorder() {
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    mediaRecorder.setAudioEncodingBitRate(16);
    mediaRecorder.setAudioSamplingRate(44100);
    mediaRecorder.setOutputFile(audioFile.getAbsolutePath());

    try {
        mediaRecorder.prepare();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.button1:
        mediaRecorder = new MediaRecorder();
        resetRecorder();
        mediaRecorder.start();

        startButton.setEnabled(false);
        stopButton.setEnabled(true);
        break;
    case R.id.button2:
        mediaRecorder.stop();
        mediaRecorder.release();
        mediaRecorder = null;

        startButton.setEnabled(true);
        stopButton.setEnabled(false);
        break;
    }
}

@Override
protected void onPause() {
    super.onPause();

    if (mediaRecorder != null) {
        mediaRecorder.stop();
        mediaRecorder.release();
        mediaRecorder = null;
    }
}
}

---

您能否在

findViewById（）

之后发布更多您正在调用的日志cat错误

setContentView（）

。你先说吧，因为你的观点还没有被夸大。如果你要否决投票，至少要有礼貌地说出原因。否则，谁又能从错误中吸取教训呢？

 06-11 18:27:44.548: E/AndroidRuntime(765): java.lang.IllegalStateException: Could not execute method of the activity
 06-11 18:27:44.548: E/AndroidRuntime(765):     at android.view.View$1.onClick(View.java:2072)

public class ExampleActivity extends Activity implements OnClickListener {
private Button startButton;
private Button stopButton;
private MediaRecorder mediaRecorder;
private File audioFile;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_layout);
    startButton = (Button) findViewById(R.id.button1);
    startButton.setOnClickListener(this);
    startButton.setText("start");

    stopButton = (Button) findViewById(R.id.button2);
    stopButton.setOnClickListener(this);
    stopButton.setEnabled(false);
    stopButton.setText("stop");

    audioFile = new File(Environment.getExternalStorageDirectory(),
            "audio_test4.3gp");
}

// this process must be done prior to the start of recording
private void resetRecorder() {
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    mediaRecorder.setAudioEncodingBitRate(16);
    mediaRecorder.setAudioSamplingRate(44100);
    mediaRecorder.setOutputFile(audioFile.getAbsolutePath());

    try {
        mediaRecorder.prepare();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.button1:
        mediaRecorder = new MediaRecorder();
        resetRecorder();
        mediaRecorder.start();

        startButton.setEnabled(false);
        stopButton.setEnabled(true);
        break;
    case R.id.button2:
        mediaRecorder.stop();
        mediaRecorder.release();
        mediaRecorder = null;

        startButton.setEnabled(true);
        stopButton.setEnabled(false);
        break;
    }
}

@Override
protected void onPause() {
    super.onPause();

    if (mediaRecorder != null) {
        mediaRecorder.stop();
        mediaRecorder.release();
        mediaRecorder = null;
    }
}
}