我正在开发一个应用程序，我需要在我的应用程序中运行恒定的相机所以我有两件事要在这里实现，1. 捕获图像 2. 录制视频
我在录制视频以及停止和重置相机时遇到困难
以下是我的代码片段：-
import java.io.File;
import java.io.IOException;
import java.util.Date;
import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.media.MediaRecorder;
import android.media.MediaRecorder.OnInfoListener;
import android.os.Bundle;
import android.os.Environment;
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.widget.Toast;
public class Myvideo1 extends Activity implements SurfaceHolder.Callback {
@Override
protected void onDestroy() {
// stopRecording();
super.onDestroy();
}
private SurfaceHolder surfaceHolder;
private SurfaceView surfaceView;
public MediaRecorder mrec = new MediaRecorder();
private Camera mCamera;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
surfaceView = (SurfaceView) findViewById(R.id.videoview);
// if(mCamera==null)
// mCamera = Camera.open();
// Please maintain sequence of following code.
// If you change sequence it will not work.
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
try {
startRecording();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
menu.add(0, 0, 0, "Start");
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
if(item.getTitle().equals("Start"))
{
try {
startRecording();
// item.setTitle("Stop");
} catch (Exception e) {
String message = e.getMessage();
Log.i(null, "Problem " + message);
mrec.release();
}
}
else
// if(item.getTitle().equals("Stop"))
{
// mrec.stop();
// mrec.release();
// mrec = null;
// item.setTitle("Start");
}
return super.onOptionsItemSelected(item);
}
protected void startRecording() throws IOException
{
if(mCamera==null)
mCamera = Camera.open();
String filename;
String path;
path= Environment.getExternalStorageDirectory().getAbsolutePath().toString();
Date date=new Date();
filename="/rec"+date.toString().replace(" ", "_").replace(":", "_")+".mp4";
//create empty file it must use
File file=new File(path,filename);
mrec = new MediaRecorder();
mCamera.lock();
mCamera.unlock();
// Please maintain sequence of following code.
// If you change sequence it will not work.
mrec.setCamera(mCamera);
mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mrec.setAudioSource(MediaRecorder.AudioSource.MIC);
mrec.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mrec.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
mrec.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mrec.setPreviewDisplay(surfaceHolder.getSurface());
mrec.setOutputFile(path+filename);
mrec.setMaxDuration(10000); //10 sec
// }
mrec.setOnInfoListener(new OnInfoListener() {
@Override
public void onInfo(MediaRecorder mr, int what, int extra) {
if (what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED) {
onStop();
Toast.makeText(getApplicationContext(), "video of 10 sec is completed", Toast.LENGTH_SHORT).show();
}
}
}
);
}
public void preparerec()
{
try {
mrec.prepare();
mCamera.setPreviewDisplay(this.surfaceHolder);
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void startrec()
{
mrec.start();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(width, height);
mCamera.setParameters(parameters);
mCamera.startPreview();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
/* if (mCamera != null) {
Parameters params = mCamera.getParameters();
mCamera.setParameters(params);
Log.i("Surface", "Created");
}
else {
Toast.makeText(getApplicationContext(), "Camera not available!",
Toast.LENGTH_LONG).show();
finish();
}*/
try {
//Open the Camera in preview mode
mCamera = Camera.open();
preparerec();
//
}
catch(Exception ioe)
{
ioe.printStackTrace(System.out);
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.stopPreview();
mCamera.release();
}
public void onStop(){
mrec.stop();
mrec.release();
mrec = null;
// item.setTitle("Start");
}
}
当我开始录制时，三星 Galaxy s2 上的屏幕会闪烁并变绿，有什么解决方案吗？