为什么MediaRecorder的start()方法抛出IllegalStateException? [英] Why does the start() method of MediaRecorder throw an IllegalStateException?

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问题描述

我正在尝试录制音频,但是 MediaRecorder 类的 start()方法抛出 IllegalStateException .我使用以下代码:

I am trying to record audio but the start() method of MediaRecorder class throws an IllegalStateException. I use the following code:

MediaRecorder recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile("/sdcard/");
try {
    recorder.prepare();
} catch (IllegalStateException e) {

// TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
Log.i("Try","Exception");
recorder.start(); 

并获得许可

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

推荐答案

维杰,recorder.setOutputFile("/sdcard/");正在设置目录,而不是文件.替换为:

Vijay, recorder.setOutputFile("/sdcard/"); is setting a directory, not a file. Replace that with:

mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
mFileName += "/youraudiofile.3gp";

使用"/sdcard"硬编码一条易碎的路径,因此请使用上面的

Using "/sdcard" hard codes a path which is fragile, so use the above

此外,要使其正常工作,您必须添加

Also, for this to work you must add

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

到您的AndroidManifext.xml

to your AndroidManifext.xml

这篇关于为什么MediaRecorder的start()方法抛出IllegalStateException?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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