camera preview showing blank screen - android-camera

Question

public class cameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
private Activity act;
private int currentCameraId;
private boolean cameraFront;
private boolean InPreview;
//private SurfaceView SV;
public cameraPreview(Context context, Activity A, SurfaceView SFV) {
super(context);
mCamera = null;
mHolder = null;
InPreview = false;
act = A;
mHolder = SFV.getHolder();
mHolder.addCallback(this);
initialzeCamera();
}
private void initialzeCamera()
{
initializeCameraBool();
OpenCamera();
}
public void OpenCamera()
{
if(mCamera==null)
{
Log.e("open", "sesami");
if(cameraFront)
mCamera.open(cameraPreview.findFrontFacingCamera());
else
mCamera.open(cameraPreview.findBackFacingCamera());
}
//StartPreview();
}
private void StartPreview()
{
if (mHolder.getSurface() == null || mCamera == null){
Log.e("Stop", "in the name of the law");
return;
}
Log.e("Started", "from the bottom");
if(InPreview)
{
mCamera.stopPreview();
InPreview = false;
}
setCameraDisplayOrientation();
if(!InPreview)
{
try {
mCamera.setPreviewDisplay(mHolder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mCamera.startPreview();
InPreview = true;
}
}
public void releaseCamera()
{
if (mCamera != null) {
if(InPreview)
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
}
public void surfaceCreated(SurfaceHolder holder) {
StartPreview();
}
public void surfaceDestroyed(SurfaceHolder holder) {
releaseCamera();
}
public void setCameraDisplayOrientation() {
android.hardware.Camera.CameraInfo info =
new android.hardware.Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(currentCameraId, info);
int rotation = act.getWindowManager().getDefaultDisplay()
.getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0: degrees = 0; break;
case Surface.ROTATION_90: degrees = 90; break;
case Surface.ROTATION_180: degrees = 180; break;
case Surface.ROTATION_270: degrees = 270; break;
}
int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else { // back-facing
result = (info.orientation - degrees + 360) % 360;
}
if(mCamera!=null)
mCamera.setDisplayOrientation(result);
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
{
StartPreview();
}
public static int findBackFacingCamera() {
int cameraId = -1;
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_BACK) {
cameraId = i;
break;
}
}
return cameraId;
}
public static int findFrontFacingCamera() {
int cameraId = -1;
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
cameraId = i;
break;
}
}
return cameraId;
}
private void initializeCameraBool()
{
if(cameraPreview.findBackFacingCamera()>=0)
cameraFront = false;
else
cameraFront = true;
}
}
So the surfaceview that I pass in comes from the main activity and it's getting it from the layout. The layout is just a surfaceview. When I launch it though it only shows a black screen. I don't understand why this is happening. It should be launching the preview display but for some reason it doesn't show it.