MediaRecorder crash [android help]

MediaRecorder crash

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Very beginner in Android/Java, coming from C and Symbian, I started from the Hellworld example to try to display the sound level (the project is to record this level in a text file for hours). This code is written in the MainActivity file, as a method inside the MainActivity Class :

public void GetAFlevel(View view) throws IllegalStateException, IOException {
    float audiolevel = 0, maxal = 0;
    MediaRecorder mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    mRecorder.setOutputFile("/dev/null");
    mRecorder.prepare();
    mRecorder.start();
    for (int i = 0; i < 1000; i++) {
        audiolevel = mRecorder.getMaxAmplitude();
        if (audiolevel > maxal)
            maxal = audiolevel;
    }
    EditText editText1 = (EditText) findViewById(R.id.editText1);
    editText1.setText(String.valueOf(maxal));
    mRecorder.stop();
    mRecorder.release();
    mRecorder = null;
}

The result is a crash of the application on the target :

11-17 00:23:09.859: D/AndroidRuntime(22096): Shutting down VM

11-17 00:23:09.859: W/dalvikvm(22096): threadid=1: thread exiting with uncaught exception (group=0x40018578)

11-17 00:23:09.921: E/AndroidRuntime(22096): FATAL EXCEPTION: main

11-17 00:23:09.921: E/AndroidRuntime(22096): java.lang.IllegalStateException: Could not execute method of the activity

No crash if I remove the following MediaRecorder functions : setAudioSource, setOutputFormat, setAudioEncoder, setOutputFile, prepare, start and stop, but getMaxAmplitude returns 0, of course.

As soon as I add only setAudioSource (normaly the only necessary for getMaxAmplitude), crash !

Any idea ?

Thanks in advance.

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