Android Open Source - audio Main Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package edu.cs4730.AudioRecord;
//w  w w .jav a 2  s.  co  m
import java.io.IOException;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

public class MainActivity extends FragmentActivity {
  String TAG = "MainActivity";
   private static String mFileName = null;
   private MediaRecorder mRecorder = null;
   private MediaPlayer mPlayer = null;
   
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    if (savedInstanceState == null) {
      getSupportFragmentManager().beginTransaction()
          .add(R.id.container, new MainFragment()).commit();
    }
    //setup the filename to record to / play from.  Assumes /sdcard exists I think.
     mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
     mFileName += "/audiorecordtest.3gp";
  }

  /*
   * A very simple implementation of get the get the player,
   * set the data source, prepare and then start playing.
   *    call stopPlaying to stop if before end audio.
   */
  private void startPlaying() {
    mPlayer = new MediaPlayer();
    try {
      mPlayer.setDataSource(mFileName);
      mPlayer.prepare();
      mPlayer.start();
    } catch (IOException e) {
      Log.e(TAG, "prepare() failed");
    }
  }
  
  /*
   * simple piece of code to stop and release the player.
   *   if you want to continue it later, don't release, so audio play example.
   */
  private void stopPlaying() {
    mPlayer.stop();  //maybe not be needed, since just releasing anyway.
    mPlayer.release();
    mPlayer = null;
  }
  
  /*
   * start to record from the mic, in the mobile format (not mp3), 3gg format.  may need vlc to play on windows if you copy the file
   * over.
   * 
   * Note, you have to set a file name that it will start into, since you can't store just in memory.
   * 
   */
  private void startRecording() {
    mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mRecorder.setOutputFile(mFileName);
    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    try {
      mRecorder.prepare();
    } catch (IOException e) {
      Log.e(TAG, "prepare() failed");
    }
    mRecorder.start();
  }
  
  /*
   * stop the recording and clears up.
   *   Note if you want to stop and then continue again, you would need to stop, but not release (and then only start() again).
   */
  private void stopRecording() {
    mRecorder.stop();
    mRecorder.release();
    mRecorder = null;
  }

  
  /*
   * clean up and make sure I have released the player and recorder.
   * 
   * (non-Javadoc)
   * @see android.support.v4.app.FragmentActivity#onPause()
   */
  
  @Override
  public void onPause() {
    super.onPause();
    if (mRecorder != null) {
      mRecorder.release();
      mRecorder = null;
    }
    if (mPlayer != null) {
      mPlayer.release();
      mPlayer = null;
    }
  }
  
  
  /**
   * A placeholder fragment containing a simple view.
   */
  public class MainFragment extends Fragment implements Button.OnClickListener{
    String TAG = "MainFragment";
    Boolean recording, playing;
    Button btn_play, btn_record;
    public MainFragment() {
      recording = true;
      playing = true;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
      View myView = inflater.inflate(R.layout.fragment_main, container,  false);
      
      btn_play = (Button) myView.findViewById(R.id.btn_play);
      btn_play.setOnClickListener(this);
      btn_record = (Button) myView.findViewById(R.id.btn_record);
      btn_record.setOnClickListener(this);
      return myView;
    }

    @Override
    public void onClick(View v) {
      if (v == btn_play) {
        if (playing) { // start playing the sound
           btn_play.setText("Stop playing");
           startPlaying();
        } else {
          btn_play.setText("Start playing");
          stopPlaying();
        }
        playing = !playing;
      } else if (v == btn_record) {
        if (recording) { // start recording
          btn_record.setText("Stop recording");
          startRecording();
        } else {
          stopRecording();
          btn_record.setText("Start recording");
        }
        recording = !recording;
      }
      
    }
  }
}

Java Source Code List

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