I've written a little program (see below) to record audio using
MediaRecorder. While everything works fine in the emulator (SDK1r2),
the program does not work on the real phone (HTC G1). On the phone,
after pressing the start button, the audio file is created, but no
content is written to it (i.e. the file size remains 0). Also, no
exception is shown in logcat, and no AudioStreamInGeneric events are
generated (such events are generated when running the program on the
emulator).

Is there maybe a setting on the phone that I have to turn on (or off)?
Or am I missing something else?

I've set the permission to record audio in the android-manifest.xml
file using
<uses-permission android:name="android.permission.RECORD_AUDIO"></uses-
permission>

Thanks for any help!

Michael
------------------------------
My program code:

package ch.ethz.dcg.mictest;

import android.app.Activity;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MicTest extends Activity {

        private final static String TAG = MicTest.class.getSimpleName();

        private MediaRecorder recorder;
        private Button button;

        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);

                recorder = new MediaRecorder();

                button = (Button)findViewById(R.id.button);
                button.setText("start");
                button.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                                        buttonClicked();
                        }
                });
        }

        private void buttonClicked() {
                if (button.getText().equals("start")) {
                        try {
                                recorder = new MediaRecorder();
                                String path = "/sdcard/test.3gpp";

                                recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
                                recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
                                recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                                recorder.setOutputFile(path);

                                recorder.prepare();
                                recorder.start();
                                button.setText("stop");
                        } catch (Exception e) {
                                Log.w(TAG, e);
                        }
                } else {
                        try {
                                recorder.stop();
                                recorder.release(); // Now the object cannot be reused
                                button.setEnabled(false);
                        } catch (Exception e) {
                                Log.w(TAG, e);
                        }
                }
        }

Run adb bugreport and take a look at the kernel log. You should see
something like this:

<6>[  820.265000] adsp: opening module AUDPREPROCTASK
<6>[  820.265488] audmgr_rpc_thread() start
<6>[  820.266281] adsp: module AUDPREPROCTASK has been registered
<6>[  820.266586] adsp: opening module AUDRECTASK
<6>[  820.267838] adsp: module AUDRECTASK has been registered
<6>[  820.268326] snd_set_device 256 1 0
<6>[  820.280289] audmgr: rpc_reply status 0
<6>[  820.291489] audmgr: rpc READY handle=0x00000000
<6>[  820.355332] audmgr: rpc CODEC_CONFIG volume=0x00002ff4
<6>[  820.355759] msm_adsp_enable() 'AUDPREPROCTASK'
<6>[  820.357468] adsp: rpc event=0, proc_id=2, module=14, image=0
<6>[  820.357926] adsp: module AUDPREPROCTASK: READY
<6>[  820.358688] msm_adsp_enable() 'AUDRECTASK'
<6>[  820.359909] adsp: rpc event=0, proc_id=2, module=13, image=0
<6>[  820.360825] adsp: module AUDRECTASK: READY
<6>[  820.362259] audpre: CFG ENABLED
<6>[  820.363663] audrec: PARAM CFG DONE
<6>[  822.417343] audrec: CFG SLEEP
<6>[  822.417801] msm_adsp_disable() 'AUDRECTASK'
<6>[  822.420151] msm_adsp_disable() 'AUDPREPROCTASK'
<6>[  822.423081] adsp: closing module AUDRECTASK
<6>[  822.423508] adsp: closing module AUDPREPROCTASK
<6>[  822.423843] adsp: disable interrupt
<6>[  822.424667] snd_set_device 256 1 1
<6>[  822.428391] audmgr: rpc_reply status 0
<3>[  822.458450] audmgr: DISABLED

If so, then we know that the audio input driver is being opened
correctly.

On Feb 11, 7:02 am, michael <kuh...@gmail.com> wrote: