Android音视频录制类MediaRecorder用法举例
分类：Android应用
MediaRecorder可以实现录音和录像。
MediaRecorder官方说明：
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;@Overridepublic 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() {@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// 这两项需要放在setOutputFormat之前mRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);// Set output file formatmRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);// 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 pathString 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 startedLog.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() stepmBtnStartStop.setText("Start");} catch (Exception e) {e.printStackTrace();}}mStartedFlg = false; // Set button status flag}}});SurfaceHolder holder = mSurfaceview.getHolder();// 取得holderholder.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; }@Overridepublic 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mSurfaceHoldermSurfaceHolder = holder;Log.d(TAG, "surfaceChanged 1");}@Overridepublic 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mSurfaceHoldermSurfaceHolder = holder;Log.d(TAG, "surfaceChanged 2");}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stub// surfaceDestroyed的时候同时对象设置为nullmSurfaceview = null;mSurfaceHolder = null;if (mRecorder != null) {mRecorder.release(); // Now the object cannot be reusedmRecorder = null;Log.d(TAG, "surfaceDestroyed release mRecorder");}}}
2.Layout文件
我不去想是否能够成功，既然选择了远方，便只顾风雨兼程！
