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" >

    <SurfaceView
        android: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;
    @Override
    protected 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;
        }
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if(event.getAction() == MotionEvent.ACTION_DOWN){
            layout.setVisibility(ViewGroup.VISIBLE);
        }
        return super.onTouchEvent(event);
    }
    @Override
    public 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;
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.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"/>