case R.id.btn_luyin:
                                        File audioFile= new File(sdcard/aaa.amr);
Intent intent3 = new Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION); 
intent3.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(audioFile));
startActivityForResult(intent3, 3); 
break;


运行结果出错，错误原因：
09-18 09:53:41.501: D/Instrumentation(17888): checkStartActivityResult  :Intent { act=android.provider.MediaStore.RECORD_SOUND (has extras) }
09-18 09:53:41.501: D/Instrumentation(17888): checkStartActivityResult  inent is instance of inent:
09-18 09:53:41.501: D/AndroidRuntime(17888): Shutting down VM
09-18 09:53:41.506: W/dalvikvm(17888): threadid=1: thread exiting with uncaught exception (group=0x4173fc08)
09-18 09:53:41.506: E/AndroidRuntime(17888): FATAL EXCEPTION: main
09-18 09:53:41.506: E/AndroidRuntime(17888): Process: com.example.cameratest, PID: 17888
09-18 09:53:41.506: E/AndroidRuntime(17888): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.provider.MediaStore.RECORD_SOUND (has extras) }
09-18 09:53:41.506: E/AndroidRuntime(17888):  at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1660)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at android.app.Instrumentation.execStartActivity(Instrumentation.java:1430)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at android.app.Activity.startActivityForResult(Activity.java:3582)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at android.app.Activity.startActivityForResult(Activity.java:3543)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at com.example.cameratest.MainActivity$1.onClick(MainActivity.java:83)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at android.view.View.performClick(View.java:4652)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at android.view.View$PerformClick.run(View.java:19455)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at android.os.Handler.handleCallback(Handler.java:733)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at android.os.Handler.dispatchMessage(Handler.java:95)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at android.os.Looper.loop(Looper.java:146)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at android.app.ActivityThread.main(ActivityThread.java:5653)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at java.lang.reflect.Method.invokeNative(Native Method)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at java.lang.reflect.Method.invoke(Method.java:515)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
09-18 09:53:41.506: E/AndroidRuntime(17888):  at dalvik.system.NativeStart.main(Native Method)