android第二十步摄像

MediaRecorder摄像类

recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);音频取自麦克
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);视频取自摄像机
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);//格式3pg
recorder.setVideoSize(320, 240);视频尺寸
recorder.setVideoFrameRate(5);视频帧数
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);音频编码
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);视频编码
recorder.setOutputFile(file.getAbsolutePath());视频保存位置
recorder.setPreviewDisplay(view.getHolder().getSurface());显示在SurfaceView上
recorder.prepare();准备录制机开始捕获编码数据
recorder.start();开始

犯错记录：

错误

    super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

正确

   super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.activity_main);

布局

<FrameLayout 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"tools:context=".MainActivity" ><SurfaceViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:id="@+id/surfaceView"/><RelativeLayout android:id="@+id/layout"android:visibility="gone"android:layout_width="match_parent"android:layout_height="match_parent"><Button android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/recordbutton"android:id="@+id/recordbutton"android:layout_alignParentBottom="true"android:layout_alignParentRight="true"android:layout_marginRight="5dp"android:onClick="record"/><Button android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/stopbutton"android:id="@+id/stopbutton"android:layout_marginRight="30dp"android:layout_toLeftOf="@id/recordbutton"android:layout_alignTop="@id/recordbutton"android:onClick="record"android:enabled="false"/></RelativeLayout></FrameLayout>

程序

public class MainActivity extends Activity {private SurfaceView view;private RelativeLayout layout;private Button recordbutton;private Button stopbutton;private MediaRecorder recorder;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.activity_main);try{view = (SurfaceView)this.findViewById(R.id.surfaceView);view.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);view.getHolder().setFixedSize(176, 144);view.getHolder().setKeepScreenOn(true);layout = (RelativeLayout)this.findViewById(R.id.layout);recordbutton = (Button)this.findViewById(R.id.recordbutton);stopbutton = (Button)this.findViewById(R.id.stopbutton);}catch(Exception e){e.printStackTrace();}}public void record(View v){switch(v.getId()){case R.id.recordbutton:try{File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".3pg");recorder = new MediaRecorder();recorder.setAudioSource(MediaRecorder.AudioSource.MIC);recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);recorder.setVideoSize(320, 240);recorder.setVideoFrameRate(5);recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);recorder.setOutputFile(file.getAbsolutePath());recorder.setPreviewDisplay(view.getHolder().getSurface());recorder.prepare();recorder.start();recordbutton.setEnabled(false);stopbutton.setEnabled(true);}catch(Exception e){e.printStackTrace();}break;case R.id.stopbutton:if(recorder!=null){recorder.stop();recorder.release();recorder=null;}recordbutton.setEnabled(true);stopbutton.setEnabled(false);break;}}@Overridepublic boolean onTouchEvent(MotionEvent event) {if(event.getAction() == MotionEvent.ACTION_DOWN){layout.setVisibility(ViewGroup.VISIBLE);}return super.onTouchEvent(event);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);return true;}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();}}

权限

   <uses-permission android:name="android.permission.RECORD_AUDIO"/><uses-permission android:name="android.permission.CAMERA"/><!-- 在SDCard中创建与删除文件权限 --><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/><!-- SDCard写入数据权限 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>