kwyjibo's profile - activity

So, here is what I did, not a real solution, but it may point someone where the real problem is. As I commented, it seems obvious that you can't draw on the same surface used for the camera preview...

I modified SampleViewBase.java in the Tutorial 0 this way to have it working:

public SampleViewBase(Context context) {
[...]
mHolder.setType( SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS );

}

public void setPreview() throws IOException { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) mCamera.setPreviewTexture( new SurfaceTexture(10) ); else mCamera.setPreviewDisplay(mHolder); }

public void surfaceCreated(SurfaceHolder holder) { Log.i(TAG, "surfaceCreated"); mHolder = holder; (new Thread(this)).start(); }

public void run() { [...] while (mThreadRun) { [...]

    if (bmp != null) {
        /*
        Canvas canvas = mHolder.lockCanvas();
        if (canvas != null) {
            canvas.drawBitmap(bmp, (canvas.getWidth() - getFrameWidth()) / 2, (canvas.getHeight() - getFrameHeight()) / 2, null);
            mHolder.unlockCanvasAndPost(canvas);
        }
        */
    }
}

}

I managed somehow to solve this. The main problem was I can't draw on the same surface the camera is using for preview. I just disabled the lock on the holder, thus disabling what OpenCV may be drawing, but I can live with this, as the data is far more important than the preview. I suppose there is a better way to solve this, as this is not necessary in my other test device, and HTC One S. I'll add the code I modified in the SampleViewBase.java in the Tutorial 0 sample.

It's seems to be something related with the camera interface, both native and not native camera access samples don't work. And that means that app shows up, but only a black screen in showed.

Native camera throws some errors like this:

12-10 16:10:24.179: E/OpenCV::camera(2647): calling (*pGetPropertyC)(0x29c8a8, 2)

A simple example like this (http://marakana.com/forums/android/examples/39.html) works, but I don't see what is the problem. Maybe the surface created?

Here is the software versions I'm working with:

• Android 2.3.6
• Android OpenCV SDK 2.4.2
• OpenCV Manager 2.3
• OCV 2.4 armeabi-v7a with NEON 2.4.3 rev 3