为什么在停止录制音频时出现IllegalStateException？

Question

我想用麦克风录制音频并保存音频文件。开始录制可以正常工作，但是当我尝试停止录制时，模拟器会给出强制关闭错误。堆栈跟踪：

01-09 18:16:59.075: E/AndroidRuntime(831): FATAL EXCEPTION: main
01-09 18:16:59.075: E/AndroidRuntime(831): java.lang.IllegalStateException
01-09 18:16:59.075: E/AndroidRuntime(831):  at android.media.MediaRecorder.stop(Native Method)
01-09 18:16:59.075: E/AndroidRuntime(831):  at com.example.voice.recorder.MainActivity.StopRecording(MainActivity.java:45)
01-09 18:16:59.075: E/AndroidRuntime(831):  at com.example.voice.recorder.MainActivity$1.onClick(MainActivity.java:76)
01-09 18:16:59.075: E/AndroidRuntime(831):  at android.view.View.performClick(View.java:3511)
01-09 18:16:59.075: E/AndroidRuntime(831):  at android.view.View$PerformClick.run(View.java:14105)
01-09 18:16:59.075: E/AndroidRuntime(831):  at android.os.Handler.handleCallback(Handler.java:605)
01-09 18:16:59.075: E/AndroidRuntime(831):  at android.os.Handler.dispatchMessage(Handler.java:92)
01-09 18:16:59.075: E/AndroidRuntime(831):  at android.os.Looper.loop(Looper.java:137)
01-09 18:16:59.075: E/AndroidRuntime(831):  at android.app.ActivityThread.main(ActivityThread.java:4424)
01-09 18:16:59.075: E/AndroidRuntime(831):  at java.lang.reflect.Method.invokeNative(Native Method)
01-09 18:16:59.075: E/AndroidRuntime(831):  at java.lang.reflect.Method.invoke(Method.java:511)
01-09 18:16:59.075: E/AndroidRuntime(831):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-09 18:16:59.075: E/AndroidRuntime(831):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-09 18:16:59.075: E/AndroidRuntime(831):  at dalvik.system.NativeStart.main(Native Method)

它在MediaRecorder.stop（）上显示错误；这是我尝试停止录制的方法：

public void StopRecording() throws IOException{
    recorder.stop();
    recorder.reset();
    recorder.release();
    recorder = null;
}

我如何开始记录：

public class MainActivity extends Activity {
    MediaRecorder recorder;
public void StartRecording(){
    recorder = new MediaRecorder();
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    recorder.setOutputFile("/sdcard/sample.3gp");
    try {
        recorder.prepare();
        recorder.start();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}   

以及我如何调用该方法：

            if (!tv.getText().equals("Recording...")){
                tv.setText("Recording...");
                tv.setTextColor(Color.RED);
                record.setImageResource(R.drawable.microphone_icon_pressed);
                StartRecording();

            }else{
                tv.setText("Click the button to start recording");
                record.setImageResource(R.drawable.microphone_icon);
                tv.setTextColor(Color.BLACK);
                try {
                    StopRecording();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

我在清单中拥有这2个权限：

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

因此开始录制可以正常工作，但是停止录制则不能。有人知道代码有什么问题吗？

Answer 1

您的记录器显然未处于记录状态。您应该确保它是否成功启动。因为在start（）之前调用stop（）时会发生IllegalStateException。并在您的stop（）块中添加RuntimeException（如果引发），然后删除输出文件。

请参见MediaRecorder.java

  /**
     * Stops recording. Call this after start(). Once recording is stopped,
     * you will have to configure it again as if it has just been constructed.
     * Note that a RuntimeException is intentionally thrown to the
     * application, if no valid audio/video data has been received when stop()
     * is called. This happens if stop() is called immediately after
     * start(). The failure lets the application take action accordingly to
     * clean up the output file (delete the output file, for instance), since
     * the output file is not properly constructed when this happens.
     *
     * @throws IllegalStateException if it is called before start()
     */
    public native void stop() throws IllegalStateException;

我还建议您在连续启动和停止应用程序之前，不要关闭记录器对象。根据以下流程，创建记录器onCreate（）/ onResume（）并释放onPause / onDestroy（）。