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;    }  }}