java.lang.RuntimeException: stop failed. when use MediaRecord#stop
<p>here is my <a href="https://gist.github.com/618198030c2ad459ad85f8961d59b6b1" rel="nofollow">full code</a>, here is <a href="https://github.com/roroco/adr-try/tree/MediaRecorder#stop-faield" rel="nofollow">my project</a>, when i use MediaRecorder#stop in #onCreate, it raise</p>

<pre><code>java.lang.RuntimeException: stop failed.
at android.media.MediaRecorder.stop(Native Method)
at ro.rotry.TestMr.onCreate(TestMr.java:39)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
at android.app.ActivityThread.-wrap11(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
</code></pre>

<p>so how to fix it?</p>