我尝试了很多例子，但我没有得到任何输出。 请告诉我将摄像机视图从后到前，从前到后更改。我不知道怎么做这件事。
My Codings如下所示
我的VideoActivity
public class VideoView extends Activity implements OnClickListener {
private Camera cameraObject;
private MyCameraSurfaceView myCameraSurfaceView;
private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 100;
private static final int CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE = 200;
private static final String IMAGE_DIRECTORY_NAME = "VideoView";
protected static final String TAG = null;
public static final int MEDIA_TYPE_VIDEO = 2;
static Uri fileUri;
SurfaceHolder surfaceHolder;
static String picture, video, timestamp, Title;
static String play = "video";
private static int RESULT_LOAD_IMAGE = 1;
private MediaRecorder mMediaRecorder;
boolean isRecording;
static ArrayList<String> userlist;
Context context;
private long startTime = 0L;
private Handler customHandler = new Handler();;
long timeInMilliseconds = 0L;
long timeSwapBuff = 0L;
long updatedTime = 0L;
TextView clicked, gallary, takephoto, camerafront, cameraback, videoview,
audioview, tbtn, capturecamera, timerValue, cam;
FrameLayout preview;
RatingBar ratings;
AlertDialog.Builder builder1;
private Runnable updateTimerThread = new Runnable() {
public void run() {
timeInMilliseconds = SystemClock.uptimeMillis() - startTime;
updatedTime = timeSwapBuff + timeInMilliseconds;
int secs = (int) (updatedTime / 1000);
int mins = secs / 60;
secs = secs % 60;
int milliseconds = (int) (updatedTime % 1000);
timerValue.setText("" + mins + ":" + String.format("%02d", secs)
+ ":" + String.format("%03d", milliseconds));
customHandler.postDelayed(this, 0);
}
};
static boolean val = false;
public static Camera isCameraAvailiable() {
Camera object = null;
try {
object = Camera.open();// default back facing camera
System.out.println("Camera object default back facing camera");
} catch (Exception e) {
e.printStackTrace();
System.out.println("Camera object");
}
return object;
}
/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
isRecording = false;
setContentView(R.layout.activity_video_view);
cameraObject = isCameraAvailiable();
preview = (FrameLayout) findViewById(R.id.imageview);
clicked = (TextView) findViewById(R.id.done);
gallary = (TextView) findViewById(R.id.image);
capturecamera = (TextView) findViewById(R.id.camera);
camerafront = (TextView) findViewById(R.id.fonrt);
cameraback = (TextView) findViewById(R.id.back);
videoview = (TextView) findViewById(R.id.video);
audioview = (TextView) findViewById(R.id.audio);
tbtn = (TextView) findViewById(R.id.t);
ratings = (RatingBar) findViewById(R.id.ratingBar1);
timerValue = (TextView) findViewById(R.id.timerValue);
cam = (TextView) findViewById(R.id.flipcam);
// cameraObject = isCameraAvailiable();
// mMediaRecorder = new MediaRecorder();
myCameraSurfaceView = new MyCameraSurfaceView(this, cameraObject);
// showCamera = new ShowCamera(this, cameraObject);
preview.addView(myCameraSurfaceView);
tbtn.setOnClickListener(this);
userlist = new ArrayList<String>();
// showCamera = new ShowCamera(this, cameraObject);
// preview.addView(showCamera);
videoview.setOnClickListener(this);
capturecamera.setOnClickListener(this);
cam.setOnClickListener(this);
}
@SuppressLint("NewApi") @Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch (arg0.getId()) {
case R.id.video:
System.out.println("video ### prepareVideoRecorder***");
if (isRecording) {
// stop recording and release camera
mMediaRecorder.stop();
timeSwapBuff += timeInMilliseconds;
customHandler.removeCallbacks(updateTimerThread);// stop the
// recording
releaseMediaRecorder(); // release the MediaRecorder object
// cameraObject.lock(); // take camera access back from
// MediaRecorder
System.out.println("-----isRecording----");
// inform the user that recording has stopped
// setText("Capture");
Toast.makeText(getApplicationContext(), "Capture",
Toast.LENGTH_SHORT).show();
isRecording = false;
} else {
// initialize video camera
releaseCamera();
if (!prepareVideoRecorder()) {
// Camera is available and unlocked, MediaRecorder is
// prepared,
// now you can start recording
finish();
System.out
.println(" ### if (prepareVideoRecorder()now you can start recording)***");
// inform the user that recording has started
// setCaptureButtonText("Stop");
Toast.makeText(getApplicationContext(), "Stop",
Toast.LENGTH_SHORT).show();
isRecording = true;
System.out.println("-----prepareVideoRecorder----");
} /*
* else { // prepare didn't work, release the camera
* releaseMediaRecorder();
*/
mMediaRecorder.start();
startTime = SystemClock.uptimeMillis();
customHandler.postDelayed(updateTimerThread, 0);
isRecording = true;
// videoview.setText("STOP");
Toast.makeText(getApplicationContext(), "recording started",
Toast.LENGTH_SHORT).show();
System.out.println("----- mMediaRecorder.start();----");
// inform user
}
case R.id.flipcam: {
try {
cameraObject.stopPreview();
preview.removeView(myCameraSurfaceView);
cameraObject.release();
cameraObject = Camera.open(1);
myCameraSurfaceView = new MyCameraSurfaceView(VideoView.this,
cameraObject);
preview.addView(myCameraSurfaceView);
} catch (Exception e) {
e.printStackTrace();
}
}
default:
break;
}
}
/** A safe way to get an instance of the Camera object. */
private boolean prepareVideoRecorder() {
System.out.println(" ###method prepareVideoRecorder***");
cameraObject = isCameraAvailiable();
mMediaRecorder = new MediaRecorder();
cameraObject.unlock();
mMediaRecorder.setCamera(cameraObject);
// Step 2: Set sources
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
System.out.println("Step 2: Set sources");
// Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
mMediaRecorder.setProfile(CamcorderProfile
.get(CamcorderProfile.QUALITY_HIGH));
// mMediaRecorder.setOutputFile("/sdcard/Pictures/BusinessCard/BusinessCard.mp4");
System.out
.println("Step 3: Set a CamcorderProfile (requires API Level 8 or higher)");
// Step 4: Set output file
mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO)
.toString());
System.out.println("Step 4: Set output file");
// Step 5: Set the preview output
mMediaRecorder.setPreviewDisplay(myCameraSurfaceView.getHolder()
.getSurface());
System.out.println("Step 5: Set the preview output");
// Step 6: Prepare configured MediaRecorder
System.out.println("Step 6: Prepare configured MediaRecorder");
try {
mMediaRecorder.prepare();
System.out.println("mMediaRecorder.prepare");
} catch (IllegalStateException e) {
Log.d(TAG,
"IllegalStateException preparing MediaRecorder: "
+ e.getMessage());
releaseMediaRecorder();
return false;
} catch (IOException e) {
Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage());
releaseMediaRecorder();
return false;
}
System.out.println("return true in prepareVideoRecorder");
return true;
}
private static File getOutputMediaFile(int type) {
// TODO Auto-generated method stub
File mediastoredir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
IMAGE_DIRECTORY_NAME);
System.out.println(" ### Environment.DIRECTORY_DCIM" + " " + " "
+ Environment.DIRECTORY_PICTURES);
if (!mediastoredir.exists()) {
if (!mediastoredir.mkdir()) {
Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create "
+ IMAGE_DIRECTORY_NAME + " directory");
return null;
}
}
timestamp = new SimpleDateFormat("yyyyMMdd HHmmss", Locale.getDefault())
.format(new java.util.Date());
timestamp.split("");
System.out.println(" ### split" + timestamp);
File mediafile;
if (type == MEDIA_TYPE_VIDEO) {
mediafile = new File(mediastoredir.getPath() + File.separator
+ "VID_" + timestamp + ".mp4");
System.out.println(" Video path " + mediastoredir.getPath()
+ File.separator + "VID_" + timestamp + ".mp4");
// video path
video = mediastoredir.getPath() + File.separator + "VID_"
+ timestamp + ".mp4";
/*
* m.setsavepath(video); m.setobjecttype(play);
* c.setdatetime(timestamp); m.setdatetime(timestamp);
* //helper.adddetail(m);
*/
System.out.println(" ### IMAGE" + video);
System.out.println(" mediastoredir.getPath()"
+ mediastoredir.getPath());
System.out.println(" mediafile)" + mediafile);
System.out.println(" ### timestamp***" + timestamp);
} else {
return null;
}
return mediafile;
}
/*
* @Override protected void onActivityResult(int requestCode, int
* resultCode, Intent data) { if (requestCode ==
* CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) { if (resultCode == RESULT_OK) { //
* Image captured and saved to fileUri specified in the Intent
* Toast.makeText(this, "Image saved to:\n" + data.getData(),
* Toast.LENGTH_LONG).show(); } else if (resultCode == RESULT_CANCELED) { //
* User cancelled the image capture } else { // Image capture failed, advise
* user } }
*
* if (requestCode == CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE) { if (resultCode
* == RESULT_OK) { // Video captured and saved to fileUri specified in the
* Intent Toast.makeText(this, "Video saved to:\n" + data.getData(),
* Toast.LENGTH_LONG).show(); } else if (resultCode == RESULT_CANCELED) { //
* User cancelled the video capture } else { // Video capture failed, advise
* user } } }
*/
/*
* @Override protected void onResume() { super.onResume(); if (cameraObject
* == null) { cameraObject = isCameraAvailiable();
*
* // Step 1: Unlock and set camera to MediaRecorder System.out
* .println("onResume()----Step 1: Unlock and set camera to MediaRecorder;"
* ); mMediaRecorder.setCamera(cameraObject);
* System.out.println("onResume()----isCameraAvailiable();"); }
*
* if (showCamera == null) {
* System.out.println("cameraObject = isCameraAvailiable();"); showCamera =
* new ShowCamera(this, cameraObject);
*
* preview.addView(showCamera);
*
* System.out.println("onResume()----preview.addView(showCamera);"); }
* Toast.makeText(getApplicationContext(), "onResume()",
* Toast.LENGTH_SHORT).show(); }
*/
@Override
protected void onPause() {
super.onPause();
releaseMediaRecorder(); // if you are using MediaRecorder, release it
// first
releaseCamera(); // release the camera immediately on pause event
}
private void releaseCamera() {
if (cameraObject != null) {
cameraObject.release(); // release the camera for other applications
cameraObject = null;
}
}
private void releaseMediaRecorder() {
if (mMediaRecorder != null) {
mMediaRecorder.reset(); // clear recorder configuration
mMediaRecorder.release(); // release the recorder object
mMediaRecorder = null;
cameraObject.lock(); // lock camera for later use
}
}
public class MyCameraSurfaceView extends SurfaceView implements
SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
public MyCameraSurfaceView(Context context, Camera camera) {
super(context);
mCamera = camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format,
int weight, int height) {
// If your preview can change or rotate, take care of those events
// here.
// Make sure to stop the preview before resizing or reformatting it.
if (mHolder.getSurface() == null) {
// preview surface does not exist
return;
}
// stop preview before making changes
try {
mCamera.stopPreview();
} catch (Exception e) {
// ignore: tried to stop a non-existent preview
}
// make any resize, rotate or reformatting changes here
// start preview with new settings
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e) {
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
// The Surface has been created, now tell the camera where to draw
// the preview.
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-gene`enter code here`rated method stub
}
}
}
Here in flipcam i have change my camera view`enter code here`