android开发中语音采集为一个文件及播放MediaRecorder，MediaPlayer

package com.androidbook.multimedia; import android.app.Activity; import android.content.ContentValues; import android.content.Intent; import android.media.MediaPlayer; import android.media.MediaRecorder; import android.media.RingtoneManager; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.widget.Button; public class Audio extends Activity { final private static String RECORDED_FILE = "/audio.mp4"; MediaRecorder audioListener; MediaPlayer player; @Override protected void onPause() { if (audioListener != null) { audioListener.release(); audioListener = null; } if (player != null) { player.release(); player = null; } super.onPause(); } @Override protected void onResume() { super.onResume(); audioListener = new MediaRecorder(); player = new MediaPlayer(); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.audio); final Button record = (Button) findViewById(R.id.record); final Button stop = (Button) findViewById(R.id.stop); final Button stopPlayback = (Button) findViewById(R.id.stop_playback); final Button play = (Button) findViewById(R.id.play); // 语音采集 record.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { if (audioListener == null) { audioListener = new MediaRecorder(); } // Fully qualified path name. In this case, we use the Files // subdir String pathForAppFiles = getFilesDir().getAbsolutePath(); pathForAppFiles += RECORDED_FILE; Log.d("Audio filename:", pathForAppFiles); audioListener.setAudioSource(MediaRecorder.AudioSource.MIC); audioListener .setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); audioListener .setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); audioListener.setOutputFile(pathForAppFiles); try { audioListener.prepare(); audioListener.start(); } catch (Exception e) { Log.e("Audio", "Failed to prepare and start audio recording", e); } stop.setVisibility(View.VISIBLE); record.setVisibility(View.GONE); play.setVisibility(View.GONE); } }); // 语音采集停止 stop.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { if (audioListener == null) return; audioListener.stop(); audioListener.release(); audioListener = null; String pathForAppFiles = getFilesDir().getAbsolutePath(); pathForAppFiles += RECORDED_FILE; Log.d("Audio filename:", pathForAppFiles); ContentValues values = new ContentValues(10); values.put(MediaStore.MediaColumns.TITLE, "RecordedAudio"); values.put(MediaStore.Audio.Media.ALBUM, "Your Groundbreaking Album"); values.put(MediaStore.Audio.Media.ARTIST, "Your Name"); values.put(MediaStore.Audio.Media.DISPLAY_NAME, "The Audio File You Recorded In Media App"); values.put(MediaStore.Audio.Media.IS_RINGTONE, 1); values.put(MediaStore.Audio.Media.IS_MUSIC, 1); values.put(MediaStore.MediaColumns.TITLE, "RecordedAudio"); values.put(MediaStore.MediaColumns.DATE_ADDED, System.currentTimeMillis() / 1000); values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/mp4"); values.put(MediaStore.Audio.Media.DATA, pathForAppFiles); Uri audioUri = getContentResolver().insert( MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, values); if (audioUri == null) { Log.d("Audio", "Content resolver failed"); return; } // Force Media scanner to refresh now. Technically, this is // unnecessary, as the media scanner will run periodically but // helpful for testing. Log.d("Audio URI", "Path = " + audioUri.getPath()); sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, audioUri)); RingtoneManager.setActualDefaultRingtoneUri( getApplicationContext(), RingtoneManager.TYPE_RINGTONE, audioUri); stop.setVisibility(View.GONE); record.setVisibility(View.VISIBLE); play.setVisibility(View.VISIBLE); } }); // 语音播放 play.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { if (player == null) { player = new MediaPlayer(); } try { // Fully qualified path name. In this case, we use the Files // subdir String audioFilePath = getFilesDir().getAbsolutePath(); audioFilePath += RECORDED_FILE; Log.d("Audio filename:", audioFilePath); player.setDataSource(audioFilePath); player.prepare(); player.start(); } catch (Exception e) { Log.e("Audio", "Playback failed.", e); } stopPlayback.setVisibility(View.VISIBLE); record.setVisibility(View.GONE); play.setVisibility(View.GONE); } }); stopPlayback.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { if (player == null) return; player.stop(); player.release(); player = null; stopPlayback.setVisibility(View.GONE); record.setVisibility(View.VISIBLE); play.setVisibility(View.VISIBLE); } }); } }