Android音视频录制类MediaRecorder用法举例

转自：http://blog.csdn.net/ameyume/article/details/7884118

MediaRecorder可以实现录音和录像。

MediaRecorder官方说明：

http://developer.android.com/reference/android/media/MediaRecorder.html

使用MediaRecorder录音录像时需要严格遵守API说明中的函数调用先后顺序，否则不能成功执行。

下面是MediaRecorder实现录像的例子。

此程序在高通MSM7225平台的华为U8500 2.2版本上可以正常录像。但在MTK MT6575平台的联想A750上不能正常运行，无法实现录像。

在展讯8810 2.3.5平台可以实现录像，但播放没有声音，通过mediaInfo查看，已经有视频数据了，但是无法播放，在PC上也不能播放，可能是录制的时候出现了问题。

可见，通过camera录像的程序对平台和硬件的依赖性很强，同样的程序在不同的手机上表现差别很大。

1.Activity类

 public class MainActivity extends Activity implements SurfaceHolder.Callback {

     private static final String TAG = "MainActivity";
     private SurfaceView mSurfaceview;
     private Button mBtnStartStop;
     private boolean mStartedFlg = false;
     private MediaRecorder mRecorder;
     private SurfaceHolder mSurfaceHolder;

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉标题栏
         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                 WindowManager.LayoutParams.FLAG_FULLSCREEN);// 设置全屏

         // 设置横屏显示
         setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

         // 选择支持半透明模式,在有surfaceview的activity中使用。
         getWindow().setFormat(PixelFormat.TRANSLUCENT);

         setContentView(R.layout.activity_main);

         mSurfaceview  = (SurfaceView)findViewById(R.id.surfaceview);
         mBtnStartStop = (Button)findViewById(R.id.btnStartStop);
         mBtnStartStop.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 if (!mStartedFlg) {
                     // Start
                     if (mRecorder == null) {
                         mRecorder = new MediaRecorder(); // Create MediaRecorder
                     }
                     try {

                         // Set audio and video source and encoder
                         // 这两项需要放在setOutputFormat之前
                         mRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
                         mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

                         // Set output file format
                         mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

                         // 这两项需要放在setOutputFormat之后
                         mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                         mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);

                         mRecorder.setVideoSize(320, 240);
                         mRecorder.setVideoFrameRate(20);
                         mRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());

                         // Set output file path
                         String path = getSDPath();
                         if (path != null) {

                             File dir = new File(path + "/recordtest");
                             if (!dir.exists()) {
                                 dir.mkdir();
                             }
                             path = dir + "/" + getDate() + ".3gp";
                             mRecorder.setOutputFile(path);
                             Log.d(TAG, "bf mRecorder.prepare()");
                             mRecorder.prepare();
                             Log.d(TAG, "af mRecorder.prepare()");
                             Log.d(TAG, "bf mRecorder.start()");
                             mRecorder.start();   // Recording is now started
                             Log.d(TAG, "af mRecorder.start()");
                             mStartedFlg = true;
                             mBtnStartStop.setText("Stop");
                             Log.d(TAG, "Start recording ...");
                         }
                     } catch (Exception e) {
                         e.printStackTrace();
                     }
                 } else {
                     // stop
                     if (mStartedFlg) {
                         try {
                             Log.d(TAG, "Stop recording ...");
                             Log.d(TAG, "bf mRecorder.stop(");
                             mRecorder.stop();
                             Log.d(TAG, "af mRecorder.stop(");
                             mRecorder.reset();   // You can reuse the object by going back to setAudioSource() step
                             mBtnStartStop.setText("Start");
                         } catch (Exception e) {
                             e.printStackTrace();
                         }
                     }
                     mStartedFlg = false; // Set button status flag
                 }
             }

         });

         SurfaceHolder holder = mSurfaceview.getHolder();// 取得holder

         holder.addCallback(this); // holder加入回调接口

         // setType必须设置，要不出错.
         holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

     }

     /**
      * 获取系统时间
      * @return
      */
     public static String getDate(){
         Calendar ca = Calendar.getInstance();
         int year = ca.get(Calendar.YEAR);           // 获取年份
         int month = ca.get(Calendar.MONTH);         // 获取月份
         int day = ca.get(Calendar.DATE);            // 获取日
         int minute = ca.get(Calendar.MINUTE);       // 分
         int hour = ca.get(Calendar.HOUR);           // 小时
         int second = ca.get(Calendar.SECOND);       // 秒

         String date = "" + year + (month + 1 )+ day + hour + minute + second;
         Log.d(TAG, "date:" + date);

         return date;
     }

     /**
      * 获取SD path
      * @return
      */
     public String getSDPath(){
         File sdDir = null;
         boolean sdCardExist = Environment.getExternalStorageState()
                 .equals(android.os.Environment.MEDIA_MOUNTED); // 判断sd卡是否存在
         if (sdCardExist)
         {
             sdDir = Environment.getExternalStorageDirectory();// 获取跟目录
             return sdDir.toString();
         }

         return null;
     }

     @Override
     public void surfaceChanged(SurfaceHolder holder, int format, int width,
             int height) {
         // TODO Auto-generated method stub
         // 将holder，这个holder为开始在onCreate里面取得的holder，将它赋给mSurfaceHolder
         mSurfaceHolder = holder;
         Log.d(TAG, "surfaceChanged 1");
     }

     @Override
     public void surfaceCreated(SurfaceHolder holder) {
         // TODO Auto-generated method stub
         // 将holder，这个holder为开始在onCreate里面取得的holder，将它赋给mSurfaceHolder
         mSurfaceHolder = holder;
         Log.d(TAG, "surfaceChanged 2");
     }

     @Override
     public void surfaceDestroyed(SurfaceHolder holder) {
         // TODO Auto-generated method stub
         // surfaceDestroyed的时候同时对象设置为null
         mSurfaceview = null;
         mSurfaceHolder = null;
         if (mRecorder != null) {
             mRecorder.release(); // Now the object cannot be reused
             mRecorder = null;
             Log.d(TAG, "surfaceDestroyed release mRecorder");
         }
     }
 }

2. Layout文件

布局文件只有一个Surface用于显示录制的视频和一个按钮用于控制开始和结束。

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="horizontal">

     <SurfaceView
          android:id="@+id/surfaceview"
          android:layout_weight="1"
          android:layout_width="0dip"
          android:layout_height="fill_parent" />

     <Button
         android:id="@+id/btnStartStop"
         android:layout_width="55dip"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
         android:text="Start"
         tools:context=".MainActivity" />

 </LinearLayout>

3.Manifest文件增加权限

需要增加使用Camera，Mic，Sd卡的权限，代码如下：

 <uses-permission android:name="android.permission.CAMERA" >
 </uses-permission>
 <uses-permission android:name="android.permission.RECORD_AUDIO" >
 </uses-permission>
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >
 </uses-permission>