Failed to get frames from camera of htc one s, How to get them?

Question

I'm new in Android programming. I have done a project on android phone. It works well on my HTC desire a8181. Because I want my software works faster, I get a htc one s. Then the program cannot get frames from the camera.Did someone used to meet such problems before? Please help me. (I used onPreviewFrame to get the frame in my software. )

public class CopyOfCameraPreview extends SurfaceView implements
    SurfaceHolder.Callback, PreviewCallback {
private SurfaceHolder mHolder;
private Camera mCamera;
private boolean preview = false;
public static int w, h, l;

public CopyOfCameraPreview1(Context context) {
    super(context);
    mCamera = getCameraInstance();  
    mHolder = getHolder();
    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}



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


    if (mHolder.getSurface() == null) {

        return;
    }

    try {
        mCamera.stopPreview();
        preview = false;
    } catch (Exception e) {

    }

    try {
        mCamera.setPreviewDisplay(mHolder);
        mCamera.startPreview();
        preview = false;

    } catch (Exception e) {
        Log.d(TAG, "Error starting camera preview: " + e.getMessage());
    }
}


public void surfaceCreated(SurfaceHolder holder) {

    try {
        mCamera.setPreviewDisplay(holder);
        Camera.Parameters parameters = mCamera.getParameters();
        parameters.setPreviewSize(960, 544);
        parameters.setPreviewFormat(PixelFormat.YCbCr_420_SP);

        mCamera.setParameters(parameters);
        mCamera.setPreviewCallback(this);

        mCamera.startPreview();
        preview = true;
    } catch (IOException e) {
        Log.d(TAG, "Error setting camera preview: " + e.getMessage());
    }

}


public void surfaceDestroyed(SurfaceHolder holder) {
    if (mCamera != null) {

        if (preview) {
            mCamera.stopPreview();
            preview = false;

        }
        mCamera.release();
        mCamera = null;

    }

}

public static Camera getCameraInstance() {
    Camera c = null;
    try {
        c = Camera.open();
    } catch (Exception e) {

    }
    return c; 
}

@Override
public void onPreviewFrame(byte[] data, Camera camera) {
    camera.setPreviewCallback(null);
    if (data != null) {
        Camera.Parameters parameters = mCamera.getParameters();
        int imageFormat = parameters.getPreviewFormat();
        if (imageFormat == ImageFormat.NV21) {
            // Bitmap image = null;
            w = parameters.getPreviewSize().width;
            h = parameters.getPreviewSize().height;
            l = data.length;
            decodeYUV420SP(data, w, h);
        }

    }

    camera.setPreviewCallback(this);
}

}

06-22 17:41:51.159: I/QCameraHWI(191):  setPreviewWindow : X, mPreviewState = 0
06-22 17:41:51.159: I/CameraService(191): Destroying camera 0
06-22 17:41:51.159: I/QualcommCamera(191): Qint android::close_camera_device(hw_device_t*): device =0x14e1270 E
06-22 17:41:51.159: I/QCameraHWI(191): ~QCameraHardwareInterface: E
06-22 17:41:51.169: I/drawView(16359): Drwaed
06-22 17:41:51.169: E/mm_camera_poll_thread(191): mm_camera_poll_thread_release: err, poll thread of channel  0s not running. cam_id=0
06-22 17:41:51.169: E/mm_camera_poll_thread(191): mm_camera_poll_thread_release: err,   poll thread of channel  1s not running. cam_id=0
06-22 17:41:51.169: E/mm_camera_poll_thread(191): mm_camera_poll_thread_release: err, poll thread of channel  2s not running. cam_id=0
06-22 17:41:51.169: E/mm_camera_poll_thread(191): mm_camera_poll_thread_release: err, poll thread of channel  3s not running. cam_id=0
06-22 17:41:51.169: E/mm-camera(206): config_shutdown_pp Camera not in streaming mode. Returning. 
06-22 17:41:51.169: E/mm-camera(206): mctl_pp_read_pipe Got EXIT 
06-22 17:41:51.169: E/mm-camera(206): mctl_pp_clear_buf: E
06-22 17:41:51.169: E/mm-camera(206): mctl_pp_clear_buf: Check for image mode 0 num 0 count = 0 data = 0x0
06-22 17:41:51.169: E/mm-camera(206): mctl_pp_clear_buf: Check for image mode 1 num -1 count = -1 data = 0x0
06-22 17:41:51.169: E/mm-camera(206): mctl_pp_clear_buf: Check for image mode 2 num 0 count = 0 data = 0x0
06-22 17:41:51.169: E/mm-camera(206): mctl_pp_clear_buf: Check for image mode 3 num 0 count = 0 data = 0x0
06-22 17:41:51.169: E/mm-camera(206): mctl_pp_clear_buf: Check for image mode 4 num 0 count = 0 data = 0x0
06-22 17:41:51.169: E/mm-camera(206): mctl_pp_clear_buf: Check for image mode 5 num 0 count = 0 data = 0x0
06-22 17:41:51.169: E/mm-camera(206): mctl_pp_clear_buf: X

Answer 1

Camera preview management is kind of tricky - surface view is available for camera preview only after it has been created and surfaceChanged() was called. You shall also keep in mind to stop preview and release camera on activity onPause() / onResume() lifecycle. That's why it is better to couple camera management to activity and not to view class.

Nd there is no need to query camera parameters in onPreviewFrame() callback - they are not going to change as you application has camera exclusively.

You may look at samples in this project, how it is supposed to work:

http://sourceforge.net/projects/javaocr/

( check out the sources and look into demos subdirectory - unless you are interested in image processing stuff )