MediaRecorder

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MediaRecorder

Used to record audio and video.用来音视频的录制与播放，状态图如下：

这里写图片描述

A common case of using MediaRecorder to record audio works as follows，使用流程如下：

 // initial MediaRecorder recorder = new MediaRecorder(); // initialized recorder.setAudioSource(MediaRecorder.AudioSource.MIC);    AudioSource        DEFAULT Default audio source        MIC Microphone audio source        REMOTE_SUBMIX   Audio source for a submix of audio streams to be presented remotely.        VOICE_CALL  Voice call uplink + downlink audio source        VOICE_COMMUNICATION Microphone audio source tuned for voice communications such as VoIP        VOICE_RECOGNITION   Microphone audio source tuned for voice recognition if available, behaves like DEFAULT otherwise. // config recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);        // 输出格式        AAC_ADTS    AAC ADTS file format        AMR_NB  AMR NB file format        AMR_WB  AMR WB file format        DEFAULT         MPEG_4  MPEG4 media file format        RAW_AMR This constant was deprecated in API level 16. Deprecated in favor of MediaRecorder.OutputFormat.AMR_NB        THREE_GPP   3GPP media file format        WEBM    VP8/VORBIS data in a WEBM container recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);    // 音频编码格式    AAC AAC Low Complexity (AAC-LC) audio codec    AAC_ELD Enhanced Low Delay AAC (AAC-ELD) audio codec    AMR_NB  AMR (Narrowband) audio codec    AMR_WB  AMR (Wideband) audio codec    DEFAULT HE_AAC  High Efficiency AAC (HE-AAC) audio codec    VORBIS  Ogg Vorbis audio codec recorder.setOutputFile(PATH_NAME); // prepare recorder.prepare(); // recording recorder.start();   // Recording is now started ... recorder.stop(); recorder.reset();   // You can reuse the object by going back to setAudioSource() step recorder.release(); // Now the object cannot be reused

使用的时候最好根据上图的流程，不然会报一些异常：

public void setAudioEncoder (int audio_encoder)Added in API level 1Sets the audio encoder to be used for recording. If this method is not called, the output file will not contain an audio track. Call this after setOutputFormat() but before prepare().Parametersaudio_encoder   the audio encoder to use.ThrowsIllegalStateException   if it is called before setOutputFormat() or after prepare().要注意调用顺序

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