Android 录音与播放功能的简单实例

 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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