android 录音时报 MediaRecorder: setOutputFile called in an invalid state(1)

因为code是完全按照google的Demo写的，觉得比较奇怪。看描述是说setOutputFormat的时候，状态应该错乱了，最后又看了一下google文档，原因在于google对于设定MediaRecorder是有要求的，写代码的时候应该完全按照人家要求的设定顺序来写，具体如下：mCamera.unlock();    mProfile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);        //1st. Initial state    mMediaRecorder = new MediaRecorder();    mMediaRecorder.setCamera(mCamera);        //2st. Initialized state    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);        //3st. config        mMediaRecorder.setOutputFormat(mProfile.fileFormat);        mMediaRecorder.setAudioEncoder(mProfile.audioCodec);        mMediaRecorder.setVideoEncoder(mProfile.videoCodec);        mMediaRecorder.setOutputFile("/sdcard/FBVideo.3gp");        mMediaRecorder.setVideoSize(mProfile.videoFrameWidth, mProfile.videoFrameHeight);        mMediaRecorder.setVideoFrameRate(mProfile.videoFrameRate);        mMediaRecorder.setVideoEncodingBitRate(mProfile.videoBitRate);        mMediaRecorder.setAudioEncodingBitRate(mProfile.audioBitRate);        mMediaRecorder.setAudioChannels(mProfile.audioChannels);        mMediaRecorder.setAudioSamplingRate(mProfile.audioSampleRate);    mMediaRecorder.setPreviewDisplay(mHolder.getSurface());        try {mMediaRecorder.prepare();mMediaRecorder.start();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}