Android音視頻錄製類MediaRecorder用法舉例

MediaRecorder可以實現錄音和錄影。

MediaRecorder官方說明：

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

使用MediaRecorder錄音錄影時需要嚴格遵守API說明中的函數調用先後順序，否則不能成功執行。

下面是MediaRecorder實現錄影的例子。

此程式在高通MSM7225平台的華為U8500 2.2版本上可以正常錄影。但在MTK MT6575平台的聯想A750上不能正常運行，無法實現錄影。

在展訊8810 2.3.5平台可以實現錄影，但播放沒有聲音，通過mediaInfo查看，已經有視頻資料了，但是無法播放，在PC上也不能播放，可能是錄製的時候出現了問題。

可見，通過camera錄影的程式對平台和硬體的依賴性很強，同樣的程式在不同的手機上表現差別很大。

1.Activity類

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);// 去掉標題列         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,                 WindowManager.LayoutParams.FLAG_FULLSCREEN);// 設定全屏         // 設定橫屏顯示         setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);         // 選擇支援半透明模式,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() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (!mStartedFlg) {// Startif (mRecorder == null) {mRecorder = new MediaRecorder(); // Create MediaRecorder}try {// Set audio and video source and encoder// 這兩項需要放在setOutputFormat之前mRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);// Set output file formatmRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);// 這兩項需要放在setOutputFormat之後        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 {// stopif (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加入回調介面         // setType必須設定，要不出錯.         holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);     }/**       * 擷取系統時間       * @return       */   public static String getDate(){ Calendar ca = Calendar.getInstance();    int year = ca.get(Calendar.YEAR);// 擷取年份    int month = ca.get(Calendar.MONTH);// 擷取月份     int day = ca.get(Calendar.DATE);// 擷取日    int minute = ca.get(Calendar.MINUTE);// 分     int hour = ca.get(Calendar.HOUR);// 小時     int second = ca.get(Calendar.SECOND);// 秒         String date = "" + year + (month + 1 )+ day + hour + minute + second; Log.d(TAG, "date:" + date);         return date;             } /**       * 擷取SD path       * @return       */ public String getSDPath(){  File sdDir = null;  boolean sdCardExist = Environment.getExternalStorageState()  .equals(android.os.Environment.MEDIA_MOUNTED); // 判斷sd卡是否存在  if (sdCardExist)  {  sdDir = Environment.getExternalStorageDirectory();// 擷取跟目錄  return sdDir.toString();  }  return null; }@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stub// 將holder，這個holder為開始在onCreate裡面取得的holder，將它賦給mSurfaceHolder         mSurfaceHolder = holder;         Log.d(TAG, "surfaceChanged 1");}@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stub// 將holder，這個holder為開始在onCreate裡面取得的holder，將它賦給mSurfaceHolder         mSurfaceHolder = holder;        Log.d(TAG, "surfaceChanged 2");}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stub// surfaceDestroyed的時候同時對象設定為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檔案

布局檔案只有一個Surface用於顯示錄製的視頻和一個按鈕用於控制開始和結束。

<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檔案增加許可權

需要增加使用Camera，Mic，Sd卡的許可權，代碼如下：

    <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>