這是Logcat里的信息

這是啥原因啊

7-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: MediaRecorder prepare ? CallingPid = ?25327 ?Callinguid= ?10144

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: java.lang.Throwable

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.media.MediaRecorder.prepare(MediaRecorder.java:792)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at com.example.wayhow.myrecorder.view.AudioManager.prepareAudio(AudioManager.java:72)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at com.example.wayhow.myrecorder.view.AudioRecorderButton$1.onLongClick(AudioRecorderButton.java:53)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.view.View.performLongClick(View.java:4947)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.widget.TextView.performLongClick(TextView.java:9081)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.view.View$CheckForLongPress.run(View.java:20345)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.os.Handler.handleCallback(Handler.java:815)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.os.Handler.dispatchMessage(Handler.java:104)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.os.Looper.loop(Looper.java:194)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.app.ActivityThread.main(ActivityThread.java:5691)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at java.lang.reflect.Method.invoke(Native Method)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at java.lang.reflect.Method.invoke(Method.java:372)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)

07-03 17:23:23.013 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: MediaRecorder start mz ? CallingPid = ?25327 ?Callinguid= ?10144 mPath = /storage/emulated/0/wayhow_recorder_audios/03436a23-f9c2-4dc1-a16e-3f5862566add.amr

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: java.lang.Throwable

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.media.MediaRecorder.start(MediaRecorder.java:851)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at com.example.wayhow.myrecorder.view.AudioManager.prepareAudio(AudioManager.java:73)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at com.example.wayhow.myrecorder.view.AudioRecorderButton$1.onLongClick(AudioRecorderButton.java:53)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.view.View.performLongClick(View.java:4947)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.widget.TextView.performLongClick(TextView.java:9081)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.view.View$CheckForLongPress.run(View.java:20345)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.os.Handler.handleCallback(Handler.java:815)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.os.Handler.dispatchMessage(Handler.java:104)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.os.Looper.loop(Looper.java:194)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at android.app.ActivityThread.main(ActivityThread.java:5691)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at java.lang.reflect.Method.invoke(Native Method)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at java.lang.reflect.Method.invoke(Method.java:372)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)

07-03 17:23:23.023 25327-25327/com.example.wayhow.myrecorder E/MediaRecorder: ? ? at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)