Android上的麦克风如何使用

Question

I have just started to develop my first Android app, and I am having a hard time figuring out how to start the microphone and have it listen, which is a main feature of my app.

I've searched the Android docs and I can't find much info on this.

Thanks in advance.

Answer 1

Maybe this can help (actually from the Android docs):
Audio Capture

1. Create a new instance of android.media.MediaRecorder .
2. Set the audio source using MediaRecorder.setAudioSource() . You will probably want to use MediaRecorder.AudioSource.MIC .
3. Set output file format using MediaRecorder.setOutputFormat() .
4. Set output file name using MediaRecorder.setOutputFile() .
5. Set the audio encoder using MediaRecorder.setAudioEncoder() .
6. Call MediaRecorder.prepare() on the MediaRecorder instance.
7. To start audio capture, call MediaRecorder.start() .
8. To stop audio capture, call MediaRecorder.stop() .
9. When you are done with the MediaRecorder instance, call MediaRecorder.release() on it. Calling MediaRecorder.release() is always recommended to free the resource immediately.

or:
Android Audio Recording Tutorial

Answer 2

You can use custom recorder:

 final static int RQS_RECORDING = 1; 
 Uri savedUri; 
 Button buttonRecord;

 @Override public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_test);
    buttonRecord = (Button) findViewById(R.id.record);
    buttonRecord.setOnClickListener(new Button.OnClickListener() {
         @Override
         public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(
                        MediaStore.Audio.Media.RECORD_SOUND_ACTION);
                startActivityForResult(intent, RQS_RECORDING);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    if (requestCode == RQS_RECORDING) {
         savedUri = data.getData();
         Toast.makeText(MainActivity.this,
         "Saved: " + savedUri.getPath(), Toast.LENGTH_LONG).show();
       }
    }