android - java.lang.RuntimeException : start failed 错误

Question

我正在尝试使用 MediaRecorder 在我的一项 Activity 中录制音频。部分代码如下所示。

File file = new File(AppConstants.MSGS_DIR, filename);
MediaRecorder recorder = new MediaRecorder();
recorder.setAudioSource(AudioSource.MIC);
recorder.setOutputFormat(OutputFormat.THREE_GPP);
recorder.setAudioEncoder(AudioEncoder.AMR_WB);
recorder.setOutputFile(file.getAbsolutePath());
try {
    recorder.prepare();
    recorder.start();
} catch (IOException e) {
    System.out.println("Exception: " + e.getMessage());
}

我已在 list 文件中授予以下权限。

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

但是在 recorder.start() 行我得到了运行时异常。 Logcat 显示以下错误消息。

09-23 15:47:54.462: E/AndroidRuntime(8697): FATAL EXCEPTION: main
09-23 15:47:54.462: E/AndroidRuntime(8697): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mypackage/com.mypackage.RecordingActivity}: java.lang.RuntimeException: start failed.
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2250)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2300)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.app.ActivityThread.access$600(ActivityThread.java:144)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1295)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.os.Looper.loop(Looper.java:150)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.app.ActivityThread.main(ActivityThread.java:5162)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at java.lang.reflect.Method.invokeNative(Native Method)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at java.lang.reflect.Method.invoke(Method.java:525)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:744)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at dalvik.system.NativeStart.main(Native Method)
09-23 15:47:54.462: E/AndroidRuntime(8697): Caused by: java.lang.RuntimeException: start failed.
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.media.MediaRecorder.start(Native Method)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at com.mypackage.RecordingActivity.startRecording(RecordingActivity.java:169)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at com.mypackage.RecordingActivity.onCreate(RecordingActivity.java:107)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.app.Activity.performCreate(Activity.java:5288)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
09-23 15:47:54.462: E/AndroidRuntime(8697):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2214)

尝试了与 stackoverflow 中的错误相对应的问题，但无法从中得出有效答案。请检查这个并帮助我在代码中出错。

仅供引用>这段代码仅在特定设备上失败。我是否缺少任何其他权限？

Answer 1

很少有设备不支持，因为它们不支持 3GP 格式以及 AudioEncoder.AMR_WB 编码。点击here检查支持的格式。

请使用下面的代码来支持最大数量的设备。

recorder.setOutputFormat(OutputFormat.MPEG_4);
recorder.setAudioEncoder(AudioEncoder.AAC);