camera startPreview failed

Question

I am creating a camera app but I have problems on startPreview, it sends me:

java.lang.RuntimeException: startPreview failed

h

Answer 1

Its late, but if someones looking for the answer

The variables w and h are not the optimal preview sizes . You can get optimal preview sizes using the function

public static Camera.Size getOptimalPreviewSize(List sizes, int w, int h) {
        final double ASPECT_TOLERANCE = 0.1;
        double targetRatio=(double)h / w;
        if (sizes == null) return null;

        Camera.Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;

        int targetHeight = h;

        for (Camera.Size size : sizes) {
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }

        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Camera.Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }

and you can call the function using

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
..
size=getOptimalPreviewSize(parameters.getSupportedPreviewSizes(), w, h);
 parameters.setPreviewSize(size.getWidth(), size.getHeight());
..

}