Apps MediaRecorder`s Exception!help me.

[tommylion]

I use MediaRecorder to record the sound.I writed source is belows:

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recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
// recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

try {
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
// recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(Environment
.getExternalStorageDirectory().getAbsolutePath()
+ "/test.mp4");
recorder.prepare();
recorder.start();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(CaptureVideoDemo.this, e.toString(),
Toast.LENGTH_LONG).show();
recorder = new MediaRecorder();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(CaptureVideoDemo.this, e.toString(),
Toast.LENGTH_LONG).show();
recorder = new MediaRecorder();
}
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when I test the source by emulator,
I used android sdk1.5.
the exception is belows,please tell me what the wrong.

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08-07 02:38:08.261: DEBUG/CameraService(556): Connect E from ICameraClient 0x157b4
08-07 02:38:08.271: DEBUG/CameraService(556): Client E constructor
08-07 02:38:08.281: DEBUG/CameraHardwareStub(556): initHeapLocked: preview size=176x144
08-07 02:38:08.301: ERROR/MediaPlayer(556): Unable to to create media player
08-07 02:38:08.310: ERROR/CameraService(556): Failed to load CameraService sounds.
08-07 02:38:08.321: ERROR/MediaPlayer(556): Unable to to create media player
08-07 02:38:08.331: ERROR/CameraService(556): Failed to load CameraService sounds.
08-07 02:38:08.331: DEBUG/CameraService(556): Client X constructor
08-07 02:38:08.340: DEBUG/CameraService(556): Connect X
08-07 02:38:08.340: ERROR/CameraInput(556): No surface is available for display
08-07 02:38:08.350: ERROR/MediaRecorder(751): prepare failed: -2147483648
08-07 02:38:08.350: WARN/System.err(751): java.io.IOException: prepare failed.
08-07 02:38:08.391: WARN/System.err(751): at android.media.MediaRecorder._prepare(Native Method)
08-07 02:38:08.401: WARN/System.err(751): at android.media.MediaRecorder.prepare(MediaRecorder.java:375)
08-07 02:38:08.401: WARN/System.err(751): at com.example.android.apis.media.CaptureVideoDemo$1.onClick(CaptureVideoDemo.java:124)
08-07 02:38:08.411: WARN/System.err(751): at android.view.View.performClick(View.java:2179)
08-07 02:38:08.411: WARN/System.err(751): at android.view.View.onKeyUp(View.java:3634)
08-07 02:38:08.430: WARN/System.err(751): at android.widget.TextView.onKeyUp(TextView.java:4233)
08-07 02:38:08.430: WARN/System.err(751): at android.view.KeyEvent.dispatch(KeyEvent.java:895)
08-07 02:38:08.440: WARN/System.err(751): at android.view.View.dispatchKeyEvent(View.java:3343)
08-07 02:38:08.440: WARN/System.err(751): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:727)
08-07 02:38:08.451: WARN/System.err(751): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:727)
08-07 02:38:08.460: WARN/System.err(751): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:727)
08-07 02:38:08.460: WARN/System.err(751): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:727)
08-07 02:38:08.460: WARN/System.err(751): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1703)
08-07 02:38:08.472: WARN/System.err(751): at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1192)
08-07 02:38:08.472: WARN/System.err(751): at android.app.Activity.dispatchKeyEvent(Activity.java:1973)
08-07 02:38:08.481: WARN/System.err(751): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1679)
08-07 02:38:08.491: WARN/System.err(751): at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2188)
08-07 02:38:08.491: WARN/System.err(751): at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2158)
08-07 02:38:08.501: WARN/System.err(751): at android.view.ViewRoot.handleMessage(ViewRoot.java:1490)
08-07 02:38:08.501: WARN/System.err(751): at android.os.Handler.dispatchMessage(Handler.java:99)
08-07 02:38:08.501: WARN/System.err(751): at android.os.Looper.loop(Looper.java:123)
08-07 02:38:08.501: WARN/System.err(751): at android.app.ActivityThread.main(ActivityThread.java:3948)
08-07 02:38:08.501: WARN/System.err(751): at java.lang.reflect.Method.invokeNative(Native Method)
08-07 02:38:08.501: WARN/System.err(751): at java.lang.reflect.Method.invoke(Method.java:521)
08-07 02:38:08.501: WARN/System.err(751): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782)
08-07 02:38:08.501: WARN/System.err(751): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
08-07 02:38:08.501: WARN/System.err(751): at dalvik.system.NativeStart.main(Native Method)
08-07 02:38:08.520: INFO/NotificationService(585): enqueueToast pkg=com.example.android.apis callback=android.app.ITransientNotification$Stub$Proxy@437469b8 duration=1
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[tommylion]

the source like this:

recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(Environment
.getExternalStorageDirectory().getAbsolutePath()
+ "/test.3gp");

goog lucy,everyone