problems with initializing video preview and releasing resources on Android

Question

Hi,

I am trying to solve the problem with initializing video preview and releasing resources when the application exits.

in onResume() the following methods are executed:

holder.addCallback(surfaceCallback);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

and in onPause() the following method is called:

holder.removeCallback(surfaceCallback);

where

surfaceHolder is defined the following way:

SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
    public void surfaceCreated(SurfaceHolder holder) {
        Log.w("CapturePreview", "Surface Created!");

        initializeVideo(mCaptureMode);

    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        Log.w("CameraView", " surface changed!");
        if (mPausing) {
            return;
        }
        initializeVideo(mCaptureMode);
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        Log.w("CameraView", " surface destroyed!");

        try {
            recorder.stop();
        } catch (IllegalStateException e) {
            Log.w("CameraView", e.getMessage());
        }

        recorder.reset();
        recorder.release();
        Log.w("CameraView", " file size: " + sdFile.length());
    }
};

The described logic successfully initializes the video preview but the problem is if I close the application (press the home button) and try to run the original camera application. In this case the camera application displays an error and closes. Also if I try to run the developing application after a while the video preview doesn't start.

Does anyone know how to fix the described problem?

Thanks!

Answer 1

Does CameraPreview from ApiDemos have the same issue? Probably you can take initialization/releasing code from it.