Android编程开发录音和播放录音简单示例

/*
 * The application needs to have the permission to write to external storage
 * if the output file is written to the external storage, and also the
 * permission to record audio. These permissions must be set in the
 * application's AndroidManifest.xml file, with something like:
 *
 * <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 * <uses-permission android:name="android.permission.RECORD_AUDIO" />
 *
 */
package com.android.audiorecordtest;
import android.app.Activity;
import android.widget.LinearLayout;
import android.os.Bundle;
import android.os.Environment;
import android.view.ViewGroup;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.Context;
import android.util.Log;
import android.media.MediaRecorder;
import android.media.MediaPlayer;
import java.io.IOException;
public class AudioRecordTest extends Activity
{
  private static final String LOG_TAG = "AudioRecordTest";
  private static String mFileName = null;
  private RecordButton mRecordButton = null;
  private MediaRecorder mRecorder = null;
  private PlayButton  mPlayButton = null;
  private MediaPlayer  mPlayer = null;
  private void onRecord(boolean start) {
    if (start) {
      startRecording();
    } else {
      stopRecording();
    }
  }
  private void onPlay(boolean start) {
    if (start) {
      startPlaying();
    } else {
      stopPlaying();
    }
  }
  private void startPlaying() {
    mPlayer = new MediaPlayer();
    try {
      mPlayer.setDataSource(mFileName);
      mPlayer.prepare();
      mPlayer.start();
    } catch (IOException e) {
      Log.e(LOG_TAG, "prepare() failed");
    }
  }
  private void stopPlaying() {
    mPlayer.release();
    mPlayer = null;
  }
  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(LOG_TAG, "prepare() failed");
    }
    mRecorder.start();
  }
  private void stopRecording() {
    mRecorder.stop();
    mRecorder.release();
    mRecorder = null;
  }
  class RecordButton extends Button {
    boolean mStartRecording = true;
    OnClickListener clicker = new OnClickListener() {
      public void onClick(View v) {
        onRecord(mStartRecording);
        if (mStartRecording) {
          setText("Stop recording");
        } else {
          setText("Start recording");
        }
        mStartRecording = !mStartRecording;
      }
    };
    public RecordButton(Context ctx) {
      super(ctx);
      setText("Start recording");
      setOnClickListener(clicker);
    }
  }
  class PlayButton extends Button {
    boolean mStartPlaying = true;
    OnClickListener clicker = new OnClickListener() {
      public void onClick(View v) {
        onPlay(mStartPlaying);
        if (mStartPlaying) {
          setText("Stop playing");
        } else {
          setText("Start playing");
        }
        mStartPlaying = !mStartPlaying;
      }
    };
    public PlayButton(Context ctx) {
      super(ctx);
      setText("Start playing");
      setOnClickListener(clicker);
    }
  }
  public AudioRecordTest() {
    mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
    mFileName += "/audiorecordtest.3gp";
  }
  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    LinearLayout ll = new LinearLayout(this);
    mRecordButton = new RecordButton(this);
    ll.addView(mRecordButton,
      new LinearLayout.LayoutParams(
        ViewGroup.LayoutParams.WRAP_CONTENT,
        ViewGroup.LayoutParams.WRAP_CONTENT,
        0));
    mPlayButton = new PlayButton(this);
    ll.addView(mPlayButton,
      new LinearLayout.LayoutParams(
        ViewGroup.LayoutParams.WRAP_CONTENT,
        ViewGroup.LayoutParams.WRAP_CONTENT,
        0));
    setContentView(ll);
  }
  @Override
  public void onPause() {
    super.onPause();
    if (mRecorder != null) {
      mRecorder.release();
      mRecorder = null;
    }
    if (mPlayer != null) {
      mPlayer.release();
      mPlayer = null;
    }
  }
}