How to blur background images in Android

Question

What is the best way to blur background images like the image below? I saw some code and libraries but their are a couple of years old or like BlurBehind library, but it doe

Answer 1

Try below code.. Put This Code in On Create..

 if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy =
                    new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }
       Url="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTIur0ueOsmVmFVmAA-SxcCT7bTodZb3eCNbiShIiP9qWCWk3mDfw";
//        Picasso.with(getContext()).load(Url).into(img_profile);
//        Picasso.with(getContext()).load(Url).into(img_c_profile);

        bitmap=getBitmapFromURL(Url);
        Bitmap blurred = blurRenderScript(bitmap, 12);//second parametre is radius
        img_profile.setImageBitmap(blurred);

Create Below Methods.. Just Copy Past..

 public static Bitmap getBitmapFromURL(String src) {
        try {
            URL url = new URL(src);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream input = connection.getInputStream();
            Bitmap myBitmap = BitmapFactory.decodeStream(input);
            return myBitmap;
        } catch (IOException e) {
            // Log exception
            return null;
        }
    }
    @SuppressLint("NewApi")
    private Bitmap blurRenderScript(Bitmap smallBitmap, int radius) {

        try {
            smallBitmap = RGB565toARGB888(smallBitmap);
        } catch (Exception e) {
            e.printStackTrace();
        }


        Bitmap bitmap = Bitmap.createBitmap(
                smallBitmap.getWidth(), smallBitmap.getHeight(),
                Bitmap.Config.ARGB_8888);

        RenderScript renderScript = RenderScript.create(getActivity());

        Allocation blurInput = Allocation.createFromBitmap(renderScript, smallBitmap);
        Allocation blurOutput = Allocation.createFromBitmap(renderScript, bitmap);

        ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(renderScript,
                Element.U8_4(renderScript));
        blur.setInput(blurInput);
        blur.setRadius(radius); // radius must be 0 < r <= 25
        blur.forEach(blurOutput);

        blurOutput.copyTo(bitmap);
        renderScript.destroy();

        return bitmap;

    }

    private Bitmap RGB565toARGB888(Bitmap img) throws Exception {
        int numPixels = img.getWidth() * img.getHeight();
        int[] pixels = new int[numPixels];

        //Get JPEG pixels.  Each int is the color values for one pixel.
        img.getPixels(pixels, 0, img.getWidth(), 0, 0, img.getWidth(), img.getHeight());

        //Create a Bitmap of the appropriate format.
        Bitmap result = Bitmap.createBitmap(img.getWidth(), img.getHeight(), Bitmap.Config.ARGB_8888);

        //Set RGB pixels.
        result.setPixels(pixels, 0, result.getWidth(), 0, 0, result.getWidth(), result.getHeight());
        return result;
    }