Use gstreamer to record audio on android

[tham]

Trying to record audio on android with gstreamer(enable permission of audio
record already), I prefer gstreamer but not the java api because there are
more functions need to be added in the future, like convert the audio to
specific format(S16LE, channels=1, rate=16000 etc), encode as wav, separate
video/audio and so on

The pipeline I am using are

    openslessrc ! audioconvert ! wavenc ! fakesink

and

    openslessrc ! audioconvert ! wavenc ! openslessink location=\"%1\"

But both of them give me error message

*E IAudioFlinger: createRecord returned error -22
E AudioRecord: AudioFlinger could not create record track, status: -22
E libOpenSLES: android_audioRecorder_realize(0xcea58a00) error creating
AudioRecord object; status -22
W libOpenSLES: Leaving Object::Realize (SL_RESULT_CONTENT_UNSUPPORTED)*

Part of my  .pro <https://pastebin.com/k7ZC5f1D>   file


Initialization codes of gstreamer, in main.cpp
<https://pastebin.com/DcRQ5sSh>  
Thanks



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