录制视频？

Question

我正在尝试制作一个应用程序，记录视频并将文件存储在表视图中。我希望能够看到每个单元格上的预览，当我按下一个单元格时，先前录制并存储在此处的视频开始播放。做这件事的最好方法是什么?如果有任何教程或视频教程，有人能把我转到那里吗？

Answer 1

视频录制代码如下：

package milos.stackVideo;



import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.media.CamcorderProfile;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.provider.Settings;
import android.util.Log;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.Menu;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class EnregistrementVideoStackActivity extends Activity implements Callback {
private SurfaceHolder surfaceHolder;
private SurfaceView surfaceView;
public MediaRecorder mrec = new MediaRecorder();
private Button startRecording = null;
//private Button stopRecording = null;
File video;
private Camera mCamera;


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.camera_surface);
    Log.i(null , "Video starting");
    startRecording = (Button)findViewById(R.id.buttonstart);
    mCamera = Camera.open();
    surfaceView = (SurfaceView) findViewById(R.id.surface_camera);
    surfaceHolder = surfaceView.getHolder();
    surfaceHolder.addCallback(this);
    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}




@Override
public boolean onCreateOptionsMenu(Menu menu)
{
menu.add(0, 0, 0, "StartRecording");
menu.add(0, 1, 0, "StopRecording");
return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case 0:
try {

startRecording();

} catch (Exception e) {
String message = e.getMessage();
Log.i(null, "Problem Start"+message);
mrec.release();
}
break;

case 1: //GoToAllNotes
mrec.stop();
mrec.release();
mrec = null;
break;

default:
break;
}
return super.onOptionsItemSelected(item);
}



protected void startRecording() throws IOException 
{


    mrec = new MediaRecorder();  // Works well
    mCamera.unlock();

    mrec.setCamera(mCamera);

    mrec.setPreviewDisplay(surfaceHolder.getSurface());
    mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    mrec.setAudioSource(MediaRecorder.AudioSource.MIC); 

    mrec.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
    mrec.setPreviewDisplay(surfaceHolder.getSurface());
    mrec.setOutputFile("/sdcard/zzzz.3gp"); 

    mrec.prepare();
    mrec.start();

}

protected void stopRecording() {
    mrec.stop();
    mrec.release();
    mCamera.release();
  }

private void releaseMediaRecorder(){
    if (mrec != null) {
        mrec.reset();   // clear recorder configuration
        mrec.release(); // release the recorder object
        mrec = null;
        mCamera.lock();           // lock camera for later use
    }
}

private void releaseCamera(){
    if (mCamera != null){
        mCamera.release();        // release the camera for other applications
        mCamera = null;
    }
}


@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {

    // TODO Auto-generated method stub

}


@Override
public void surfaceCreated(SurfaceHolder holder) {
    // TODO Auto-generated method stub

    if (mCamera != null){
        Parameters params = mCamera.getParameters();
        mCamera.setParameters(params);
    }
    else {
        Toast.makeText(getApplicationContext(), "Camera not available!", Toast.LENGTH_LONG).show();
        finish();
    }

}


@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    mCamera.stopPreview();
    mCamera.release();
    // TODO Auto-generated method stub

}


}

这对某些人来说是有用的。