Unsolved: Android audio recording using example from Google -

i'm learning how record audio using http://developer.android.com/guide/topics/media/audio-capture.html#example

everything works fine, want switch:

mfilename = environment.getexternalstoragedirectory().getabsolutepath(); mfilename += "/audiorecordtest.3gp"; 

to

mfilename = getfilesdir().getabsolutepath(); mfilename += "/audiorecordtest.3gp"; 

but error

08-19 15:51:44.212: e/mediaplayer(6654): error (1, -2147483648) 08-19 15:51:44.212: e/audiorecordtest(6654): prepare() failed 

i tried log new code (to make sure i'm using valid path).

note:

this works on samsung galaxy, doesn't work on nexus one. want work on 2.x, 3.x, , 4.x

update: added log in startrecording():

mrecorder.setoutputfile(mfilename);         log.e("log", mfilename); 

the output of log is:

08-22 12:28:40.112: e/log(9666): /data/data/com.example.testrecorder/files/audiorecordtest.3gp 

tried logging exception:

  private void startplaying() {         mplayer = new mediaplayer();         try {             mplayer.setdatasource(mfilename);             mplayer.prepare();             mplayer.start();         } catch (ioexception e) {             log.e(log_tag, "prepare() failed", e);         }     }  08-22 13:08:03.158: e/mediaplayer(10093): error (1, -2147483648) 08-22 13:08:03.168: e/audiorecordtest(10093): prepare() failed 08-22 13:08:03.168: e/audiorecordtest(10093): java.io.ioexception: prepare failed.: status=0x1 08-22 13:08:03.168: e/audiorecordtest(10093):   @ android.media.mediaplayer.prepare(native method) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ com.example.testrecorder.mainactivity.startplaying(mainactivity.java:51) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ com.example.testrecorder.mainactivity.onplay(mainactivity.java:41) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ com.example.testrecorder.mainactivity.access$1(mainactivity.java:39) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ com.example.testrecorder.mainactivity$playbutton$1.onclick(mainactivity.java:113) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ android.view.view.performclick(view.java:2532) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ android.view.view$performclick.run(view.java:9308) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ android.os.handler.handlecallback(handler.java:587) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ android.os.handler.dispatchmessage(handler.java:92) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ android.os.looper.loop(looper.java:150) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ android.app.activitythread.main(activitythread.java:4333) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ java.lang.reflect.method.invokenative(native method) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ java.lang.reflect.method.invoke(method.java:507) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:839) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ com.android.internal.os.zygoteinit.main(zygoteinit.java:597) 08-22 13:08:03.168: e/audiorecordtest(10093):   @ dalvik.system.nativestart.main(native method) 

when create new mediaplayer object, it's not part of your app, it's part of system. because true, can't read files in app's private directory unless world_readable. that's why works external directory , not internal one. yes, sounds ridiculous, agree.

you should able around creating filedescriptor , passing mediaplayer way:

fileinputstream fis = new fileinputstream(mfilename); mplayer.setdatasource(fis.getfd()); 

note: gtkandroid gives a more thorough explanation, found through bug tracker. if works you, i'd suggest upvote answer on other question well.