Android 录音与播放功能的简单实例
最近在研究Android中一些常用的功能，像地图、拍照、录音和播放的实现等等，还有一些侧滑、动画等是如何实现的。
今天就把录音和播放的实现分享一下，录音和播放比较简单，利用android内部的类即可实现。
1、先看下运行后的界面：
以下三张图分别是进入、录音、播放时的。
2、Layout布局文件
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:background="@drawable/switcherbar_bg" android:gravity="center" android:text="@string/audio_record_title" android:textColor="#ffffff" android:textSize="16sp" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerInParent="true" android:orientation="vertical" android:paddingLeft="10dip" android:paddingRight="10dip" > <TextView android:id="@+id/audio_record_time" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="00:00" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dip" android:orientation="horizontal" > <Button android:id="@+id/audio_record_start" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:background="@drawable/searchbtn_normal" android:text="开始录音" android:textSize="14sp" /> <Button android:id="@+id/audio_record_stop" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_marginLeft="5dip" android:layout_weight="1" android:background="@drawable/searchbtn_bg" android:text="结束录音" android:textSize="14sp" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dip" android:orientation="horizontal" > <Button android:id="@+id/audio_record_play" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:background="@drawable/searchbtn_normal" android:text="播放录音" android:textSize="14sp" /> <Button android:id="@+id/audio_record_select" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_marginLeft="5dip" android:layout_weight="1" android:background="@drawable/searchbtn_bg" android:text="确定选择" android:textSize="14sp" /> </LinearLayout> </LinearLayout> </RelativeLayout>
3 Activity类
录音涉及到二个Activity，第一个Activity比较简单，我这里大概说下，其实就是有个按钮，点击后转移第二个Activity，录音返回后，在第一个Activity中获取录音的文件名、时长等。
第一个Activity部分代码：
// 录音事件 ksly_btn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(MaintainVisitEditActivity.this, AudioRecordActivity.class); intent.setAction(Intent.ACTION_VIEW); intent.putExtra("duration", entity.getVoiceDuration()); intent.putExtra("fileName", entity.getVoiceRecord()); startActivityForResult(intent, VOICE_RECODE); } }); @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == VOICE_RECODE && resultCode == AudioRecordActivity.SUCCESS) { entity.setVoiceDuration(data.getLongExtra("duration", 0));// 时长 entity.setVoiceRecord(data.getStringExtra("fileName"));// 文件名（绝对路径） ksly_time.setText(DateTimeUtils.formatToMillisecond(entity.getVoiceDuration())); } }
第二个Activity代码：
这里要注意一下，就是需要捕获返回键，处理一下，就是点击返回键时，也返回个状态码，以表示没有录音成功。
package com.whowii.ct.cm.activity; import java.io.File; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Timer; import java.util.TimerTask; import android.app.Activity; import android.content.Intent; import android.media.MediaPlayer; import android.media.MediaPlayer.OnCompletionListener; import android.media.MediaRecorder; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.KeyEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import com.whowii.ct.cm.R; import com.whowii.ct.cm.command.QueryParams; import com.whowii.ct.cm.utils.DateTimeUtils; import com.whowii.ct.cm.utils.SDCardUtils; /** * 录制音频 * * @author Administrator * */ public class AudioRecordActivity extends Activity { private TextView audio_record_time; private Button audio_record_start, audio_record_stop, audio_record_play, audio_record_select; private MediaRecorder mediaRecorder; private final String TAG = AudioRecordActivity.class.getSimpleName(); private boolean isIdle = true;// 当前是否空闲，false：表示正在录音 private long startTime = 0, stopTime = 0, duration = 0;// 开始时间、结束时间、录音时长 private String fileName = null;// 存储录音文件的路径 private Timer timer = null;// Timer计时器 public static final int SUCCESS = 1;// 录制成功; public static final int FAILURE = 0;// 录制失败 private MediaPlayer mediaPlayer; private TimerTask task = new TimerTask() { final Handler handler = new Handler() { public void handleMessage(Message message) { Bundle data = message.getData(); audio_record_time.setText(DateTimeUtils.formatToMillisecond(data.getLong("time"))); } }; public void run() { Message message = new Message(); long t = System.currentTimeMillis(); Bundle data = new Bundle(); data.putLong("time", t - startTime); message.setData(data); handler.sendMessage(message); } }; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); // 设置无标题栏 setContentView(R.layout.audio_record); mediaPlayer = new MediaPlayer(); initControl(); setListener(); timer = new Timer(true); fileName = getIntent().getStringExtra("fileName"); duration = getIntent().getLongExtra("duration", 0); } private void initControl() { audio_record_time = (TextView) findViewById(R.id.audio_record_time); audio_record_start = (Button) findViewById(R.id.audio_record_start); audio_record_stop = (Button) findViewById(R.id.audio_record_stop); audio_record_play = (Button) findViewById(R.id.audio_record_play); audio_record_select = (Button) findViewById(R.id.audio_record_select); } private void setListener() { // 播放完成事件 mediaPlayer.setOnCompletionListener(new OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { isIdle = true; audio_record_play.setText("播放录音"); audio_record_play.setBackgroundResource(R.drawable.searchinput_bg); } }); // 开始录音 audio_record_start.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (!isIdle) { return; } if (!SDCardUtils.sdCardExists()) { Toast.makeText(AudioRecordActivity.this, "缺少SD卡，请先插入后再操作！", Toast.LENGTH_LONG).show(); return; } audio_record_start.setText("开始录音"); audio_record_start.setEnabled(true); duration = 0; startTime = System.currentTimeMillis(); fileName = QueryParams.CACHE_AUDIO_PATH; fileName += new SimpleDateFormat("yyyyMMdd_hhmmss").format(new Date(startTime)) + ".amr"; File file = new File(fileName); mediaRecorder = new MediaRecorder(); mediaRecorder.setOutputFile(file.getAbsolutePath()); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); try { mediaRecorder.prepare(); mediaRecorder.start(); isIdle = false; audio_record_start.setBackgroundResource(R.drawable.searchbtn_pressed); timer.schedule(task, 0, 100); } catch (IOException e) { startTime = 0; Log.e(TAG, e.toString()); Toast.makeText(AudioRecordActivity.this, "录制时发生异常！", Toast.LENGTH_LONG).show(); } } }); // 结束录音 audio_record_stop.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (mediaRecorder != null) { stopTime = System.currentTimeMillis(); duration = stopTime - startTime; timer.cancel(); mediaRecorder.stop(); mediaRecorder.release(); mediaRecorder = null; audio_record_start.setBackgroundResource(R.drawable.searchbtn_normal); isIdle = true; } } }); // 播放录音 audio_record_play.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (!isIdle) { return; } if (audio_record_play.getText().equals("播放录音")) { if (fileName == null || fileName.equals("") || duration == 0) { Toast.makeText(AudioRecordActivity.this, "没有录音文件！", Toast.LENGTH_LONG).show(); return; } try { mediaPlayer.reset(); mediaPlayer.setDataSource(fileName); mediaPlayer.prepare(); mediaPlayer.start(); isIdle = false; audio_record_play.setText("终止播放"); audio_record_play.setBackgroundResource(R.drawable.searchbtn_pressed); } catch (Exception e) { e.printStackTrace(); Toast.makeText(AudioRecordActivity.this, "播放录音时遇到错误！", Toast.LENGTH_LONG).show(); } } else { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.stop(); isIdle = true; } audio_record_play.setText("播放录音"); audio_record_play.setBackgroundResource(R.drawable.searchinput_bg); } } }); // 确认选择 audio_record_select.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (fileName == null || fileName.equals("") || duration == 0) { Toast.makeText(AudioRecordActivity.this, "没有录音文件！", Toast.LENGTH_LONG).show(); return; } Intent intent = new Intent(); intent.putExtra("fileName", fileName); intent.putExtra("duration", duration); setResult(SUCCESS, intent);// 返回成功标识 isIdle = true; if (mediaPlayer != null) { if (mediaPlayer.isPlaying()) { mediaPlayer.stop(); } mediaPlayer = null; } finish();// 结束当前的activity,等于点击返回按钮 } }); } // 捕获返回键，关闭当前页面时返回失败标识 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { setResult(FAILURE); isIdle = true; if (mediaPlayer != null) { if (mediaPlayer.isPlaying()) { mediaPlayer.stop(); } mediaPlayer = null; } finish(); return true; } return super.onKeyDown(keyCode, event); } }
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