用MediaRecoder类进行录制视频

与音频的不同点是在视频录制中需要定义一个额外的SurfaceView组件，以捕获摄像头采集的数据。

（1）主程序

publicclass MyMediaRecorderDemo extends Activity {

private ImageButton record = null;

private ImageButton stop = null;

private ImageButton browser = null;

private TextView info = null;

private MediaRecorder mediaRecorder = null;

private boolean sdcardExists = false; // SD卡存在的标记

private File recordVideoSaveFileDir = null;

private File recordVideoSaveFile = null;

private String recordVideoSaveFileName =null;

private String recDir ="mldnvideo";

private boolean isRecord = false;

private SurfaceView surface = null;

@Override

public void onCreate(BundlesavedInstanceState) {

super.onCreate(savedInstanceState);

super.requestWindowFeature(Window.FEATURE_NO_TITLE);//
不显示标题

super.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

WindowManager.LayoutParams.FLAG_FULLSCREEN);

super.getWindow().addFlags(

WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//
高亮的风格显示

super.setContentView(R.layout.main);

this.record = (ImageButton)super.findViewById(R.id.record);

this.stop = (ImageButton) super.findViewById(R.id.stop);

this.browser = (ImageButton)super.findViewById(R.id.browser);

this.info = (TextView)super.findViewById(R.id.info);

this.surface = (SurfaceView)super.findViewById(R.id.surface);

this.surface.getHolder().setType(

SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

this.surface.getHolder().setFixedSize(480,800);

if ((this.sdcardExists =Environment.getExternalStorageState().equals(

Environment.MEDIA_MOUNTED))) {

this.recordVideoSaveFileDir = newFile(Environment

.getExternalStorageDirectory().toString()

+ File.separator

+MyMediaRecorderDemo.this.recDir + File.separator); //
保存文件夹

if(!this.recordVideoSaveFileDir.exists()) {

this.recordVideoSaveFileDir.mkdirs();//
创建文件夹

}

}

this.record.setOnClickListener(newRecordOnClickListenerImpl()) ;

this.stop.setOnClickListener(newStopOnClickListenerImpl()) ;

this.browser.setOnClickListener(newBrowserOnClickListenerImpl()) ;

this.stop.setEnabled(false) ; // 停止录象的按钮暂时不可用

}

private class RecordOnClickListenerImplimplements OnClickListener {

@Override

public void onClick(View v) {

if(MyMediaRecorderDemo.this.sdcardExists){ // sd卡存在

MyMediaRecorderDemo.this.recordVideoSaveFileName= MyMediaRecorderDemo.this.recordVideoSaveFileDir

.toString()

+ File.separator

+ "MLDNVideo_"

+System.currentTimeMillis() + ".3gp";//
文件的路径名称

MyMediaRecorderDemo.this.recordVideoSaveFile= new File(

MyMediaRecorderDemo.this.recordVideoSaveFileName);//文件路径

MyMediaRecorderDemo.this.mediaRecorder= new MediaRecorder() ;

MyMediaRecorderDemo.this.mediaRecorder.reset();//
重置

MyMediaRecorderDemo.this.mediaRecorder

.setAudioSource(MediaRecorder.AudioSource.MIC);

MyMediaRecorderDemo.this.mediaRecorder

.setVideoSource(MediaRecorder.VideoSource.CAMERA);

MyMediaRecorderDemo.this.mediaRecorder

.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

MyMediaRecorderDemo.this.mediaRecorder

.setVideoEncoder(MediaRecorder.VideoEncoder.H263);//定义视频编码

MyMediaRecorderDemo.this.mediaRecorder

.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//定义音频编码

MyMediaRecorderDemo.this.mediaRecorder

.setOutputFile(MyMediaRecorderDemo.this.recordVideoSaveFileName);//定义输出文件

MyMediaRecorderDemo.this.mediaRecorder.setVideoSize(320,240) ;

MyMediaRecorderDemo.this.mediaRecorder.setVideoFrameRate(10);//每秒10帧

MyMediaRecorderDemo.this.mediaRecorder

.setPreviewDisplay(MyMediaRecorderDemo.this.surface

.getHolder().getSurface());//定义视频显示

try {

MyMediaRecorderDemo.this.mediaRecorder.prepare();

} catch (Exception e) {

Log.i("MyMediaRecorderDemo",e.toString()) ;

}

MyMediaRecorderDemo.this.mediaRecorder.start();

MyMediaRecorderDemo.this.info.setText("正在录象中...") ;

MyMediaRecorderDemo.this.stop.setEnabled(true);

MyMediaRecorderDemo.this.record.setEnabled(false);

MyMediaRecorderDemo.this.isRecord= true ;

}

}

}

private class StopOnClickListenerImplimplements OnClickListener {

@Override

public void onClick(View v) {

if(MyMediaRecorderDemo.this.isRecord){

MyMediaRecorderDemo.this.mediaRecorder.stop();

MyMediaRecorderDemo.this.mediaRecorder.release();

MyMediaRecorderDemo.this.stop.setEnabled(false);

MyMediaRecorderDemo.this.record.setEnabled(true);

MyMediaRecorderDemo.this.info.setText("录象结束，文件路径为："

+MyMediaRecorderDemo.this.recordVideoSaveFile);

}

}

}

private class BrowserOnClickListenerImplimplements OnClickListener {

@Override

public void onClick(View v) {

Intent it = newIntent(MyMediaRecorderDemo.this,BroswerActivity.class) ;

MyMediaRecorderDemo.this.startActivity(it);

}

}

@Override

public boolean onKeyDown(int keyCode,KeyEvent event) {

if(keyCode == KeyEvent.KEYCODE_BACK) {//如果是手机上的返回键

super.finish() ;//程序结束

}

return false ;

}

}

（2）定义BrowserActivity程序完成ListView列表显示

public class BroswerActivity extends Activity {

private ImageButton back = null ;

private ListView videolist = null ;

private SimpleAdapter recordSimpleAdapter =null ;

private List<Map<String,Object>>recordFiles = null ;

private String recDir ="mldnvideo";

private File recordVideoSaveFileDir = null;

private boolean sdcardExists = false;

@Override

public void onCreate(Bundle savedInstanceState){

super.onCreate(savedInstanceState);

super.requestWindowFeature(Window.FEATURE_NO_TITLE);//
不显示标题

super.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

WindowManager.LayoutParams.FLAG_FULLSCREEN);

super.getWindow().addFlags(

WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//
高亮的风格显示

super.setContentView(R.layout.broswer);

if ((this.sdcardExists =Environment.getExternalStorageState().equals(

Environment.MEDIA_MOUNTED))) {

this.recordVideoSaveFileDir = newFile(Environment

.getExternalStorageDirectory().toString()

+ File.separator

+BroswerActivity.this.recDir + File.separator); //
保存文件夹

if(!this.recordVideoSaveFileDir.exists()) {

this.recordVideoSaveFileDir.mkdirs();//
创建文件夹

}

}

this.back = (ImageButton)super.findViewById(R.id.back) ;

this.videolist = (ListView)super.findViewById(R.id.videolist) ;

this.back.setOnClickListener(newBackOnClickListenerImpl()) ;

this.getRecordFiles() ;

this.videolist.setOnItemClickListener(newOnItemClickListenerImpl()) ;

}

private void getRecordFiles() {

this.recordFiles = newArrayList<Map<String, Object>>();

if(this.sdcardExists){

File files [] =this.recordVideoSaveFileDir.listFiles() ;

for (int x = 0; x < files.length;x++) {

Map<String, Object>fileInfo = new HashMap<String, Object>();

fileInfo.put("filename",files[x].getName()) ;

this.recordFiles.add(fileInfo) ;

}

this.recordSimpleAdapter = newSimpleAdapter(this,

this.recordFiles,R.layout.recordfiles,

new String[] {"filename" }, new int[] { R.id.filename });

this.videolist.setAdapter(this.recordSimpleAdapter);

}

}

private class BackOnClickListenerImplimplements OnClickListener {

@Override

public void onClick(View v) {

Intent it = newIntent(BroswerActivity.this,MyMediaRecorderDemo.class) ;

BroswerActivity.this.startActivity(it);

}

}

private class OnItemClickListenerImplimplements OnItemClickListener {

@Override

public voidonItemClick(AdapterView<?> adapter, View view, int position,

long id) {

if(BroswerActivity.this.recordSimpleAdapter.getItem(position) instanceof Map) {

Map<?, ?> map = (Map<?,?>) BroswerActivity.this.recordSimpleAdapter

.getItem(position);

Intent intent = new Intent(BroswerActivity.this,PlayVideoActivity.class);

intent.putExtra("filepath",

BroswerActivity.this.recordVideoSaveFileDir.toString()

+ File.separator

+map.get("filename").toString());

BroswerActivity.this.startActivity(intent);

}

}

}

}

（3）视频播放程序

publicclass PlayVideoActivity extends Activity {

private ImageButton play = null;

private ImageButton stop = null;

private ImageButton back = null;

private MediaPlayer media = null;

private SurfaceView sufaceView = null;

private SurfaceHolder surfaceHolder = null;

private String filepath = null;

@Override

public void onCreate(BundlesavedInstanceState) {

super.onCreate(savedInstanceState);

super.requestWindowFeature(Window.FEATURE_NO_TITLE);//
不显示标题

super.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

WindowManager.LayoutParams.FLAG_FULLSCREEN);

super.getWindow().addFlags(

WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//
高亮的风格显示

super.setContentView(R.layout.play);

this.filepath =super.getIntent().getStringExtra("filepath") ;

this.play = (ImageButton)super.findViewById(R.id.play);

this.stop = (ImageButton)super.findViewById(R.id.stop);

this.back = (ImageButton)super.findViewById(R.id.back);

this.sufaceView = (SurfaceView)super.findViewById(R.id.surfaceView) ;

this.surfaceHolder =this.sufaceView.getHolder() ;

this.surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

this.media = new MediaPlayer() ;

this.media.reset() ;

try {

this.media.setDataSource(this.filepath);

} catch (Exception e) {

}

this.play.setOnClickListener(newPlayOnClickListenerImpl());

this.stop.setOnClickListener(newStopOnClickListenerImpl());

this.back.setOnClickListener(newBackOnClickListenerImpl());

}

private class PlayOnClickListenerImplimplements OnClickListener {

@Override

public void onClick(View v) {

PlayVideoActivity.this.media.setAudioStreamType(AudioManager.STREAM_MUSIC);

PlayVideoActivity.this.media.setDisplay(PlayVideoActivity.this.surfaceHolder);

try {

PlayVideoActivity.this.media.prepare();

PlayVideoActivity.this.media.start();

} catch (Exception e) {

}

}

}

private class StopOnClickListenerImplimplements OnClickListener {

@Override

public void onClick(View v) {

PlayVideoActivity.this.media.stop();

}

}

private class BackOnClickListenerImplimplements OnClickListener {

@Override

public void onClick(View v) {

Intent it = newIntent(PlayVideoActivity.this, BroswerActivity.class);

PlayVideoActivity.this.startActivity(it);

}

}

@Override

public boolean onKeyDown(int keyCode,KeyEvent event) {

if(keyCode == KeyEvent.KEYCODE_BACK) {

this.media.stop() ;

this.media.release() ;

super.finish() ;

}

return false ;

}

}

（4）定义BrowserActivity程序进行ListView显示时的布局管理器---recordfiles.xml

<?xmlversion="1.0" encoding="utf-8"?>

<TableLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TableRow>

<ImageView

android:id="@+id/icon"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:src="@drawable/file_icon"/>

<TextView

android:id="@+id/filename"

android:textSize="25px"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

</TableRow>

</TableLayout>

(5)定义BrowserActivity程序的布局管理器---browser.xml

<?xmlversion="1.0" encoding="utf-8"?>

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="horizontal"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center">

<TextView

android:id="@+id/info"

android:textSize="25px"

android:gravity="center"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="视频文件列表" />

<ImageButton

android:id="@+id/back"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/back"/>

</LinearLayout>

<ListView

android:id="@+id/videolist"

android:layout_width="fill_parent"

android:layout_height="fill_parent"/>

</LinearLayout>

(6)定义视频播放程序PlayVideoActivity的布局管理器---play.xml

<?xmlversion="1.0" encoding="utf-8"?>

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="horizontal"

android:layout_width="wrap_content"

android:layout_height="wrap_content">

<ImageButton

android:id="@+id/play"

android:layout_width="wrap_content"

android:layout_height="fill_parent"

android:src="@drawable/play"/>

<ImageButton

android:id="@+id/stop"

android:layout_width="wrap_content"

android:layout_height="fill_parent"

android:src="@drawable/stop"/>

<ImageButton

android:id="@+id/back"

android:layout_width="wrap_content"

android:layout_height="fill_parent"

android:src="@drawable/back"/>

</LinearLayout>

<SurfaceView

android:id="@+id/surfaceView"

android:layout_width="fill_parent"

android:layout_height="fill_parent"/>

</LinearLayout>

(7)配置权限文件

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

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

<uses-permissionandroid:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

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