Android音频操作：录音和播放

package fk.androiddemo_034; import android.app.Activity; import android.media.MediaPlayer; import android.media.MediaRecorder; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.View; import android.widget.Button; import java.io.IOException; public class MainActivity extends Activity { private static final String LOG_TAG = "AudioRecordTest"; //语音文件 private String FileName = null; //界面控件 private Button startRecord; private Button startPlay; private Button stopRecord; private Button stopPlay; //语音操作对象 private MediaPlayer mPlayer = null; private MediaRecorder mRecorder = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //开始录音 startRecord = (Button)findViewById(R.id.startRecord); startRecord.setOnClickListener(new startRecordListener()); //结束录音 stopRecord = (Button)findViewById(R.id.stopRecord); stopRecord.setOnClickListener(new stopRecordListener()); //开始播放 startPlay = (Button)findViewById(R.id.startPlay); startPlay.setOnClickListener(new startPlayListener()); //结束播放 stopPlay = (Button)findViewById(R.id.stopPlay); stopPlay.setOnClickListener(new stopPlayListener()); //设置sdcard的路径 FileName = Environment.getExternalStorageDirectory().getAbsolutePath(); FileName += "/FK_AudioTest.3gp";//会存放到手机外部存储最外层目录 } //开始录音 class startRecordListener implements View.OnClickListener { @Override public void onClick(View v) { // TODO Auto-generated method stub mRecorder = new MediaRecorder(); mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mRecorder.setOutputFile(FileName); mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); try { mRecorder.prepare(); } catch (IOException e) { Log.e(LOG_TAG, "prepare() failed"); } mRecorder.start(); } } //停止录音 class stopRecordListener implements View.OnClickListener { @Override public void onClick(View v) { // TODO Auto-generated method stub mRecorder.stop(); mRecorder.release(); mRecorder = null; } } //播放录音 class startPlayListener implements View.OnClickListener { @Override public void onClick(View v) { // TODO Auto-generated method stub mPlayer = new MediaPlayer(); try{ mPlayer.setDataSource(FileName); mPlayer.prepare(); mPlayer.start(); }catch(IOException e){ Log.e(LOG_TAG,"播放失败"); } } } //停止播放录音 class stopPlayListener implements View.OnClickListener { @Override public void onClick(View v) { // TODO Auto-generated method stub mPlayer.release(); mPlayer = null; } } }