BlurBuilder.java

package com.kgisl.sharetruck.hub.util;

import android.content.Context;
import android.graphics.Bitmap;
import android.os.Build;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicBlur;
import android.support.annotation.RequiresApi;

/**
 * Created by admin on 17-03-2017.
 */

public class BlurBuilder {
    private static final float BITMAP_SCALE = 0.4f;
    private static final float BLUR_RADIUS = 7.5f;

    private static final float BLUR_RADIUS_TWO = 25f;

    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
    public static Bitmap blur(Context context, Bitmap image) {
        int width = Math.round(image.getWidth() * BITMAP_SCALE);
        int height = Math.round(image.getHeight() * BITMAP_SCALE);

        Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false);
        Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);

        RenderScript rs = RenderScript.create(context);
        ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
        Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap);
        Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);
        theIntrinsic.setRadius(BLUR_RADIUS);
        theIntrinsic.setInput(tmpIn);
        theIntrinsic.forEach(tmpOut);
        tmpOut.copyTo(outputBitmap);

        return outputBitmap;
    }

    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
    public static Bitmap blurImage(Context context,Bitmap image) {
        Bitmap U8_4Bitmap;
        if(image.getConfig() == Bitmap.Config.ARGB_8888) {
            U8_4Bitmap = image;
        } else {
            U8_4Bitmap = image.copy(Bitmap.Config.ARGB_8888, true);
        }

        //==============================

        Bitmap bitmap = Bitmap.createBitmap(U8_4Bitmap.getWidth(), U8_4Bitmap.getHeight(), U8_4Bitmap.getConfig());

        final RenderScript rs = RenderScript.create(context);
        final Allocation input = Allocation.createFromBitmap(rs,
                U8_4Bitmap,
                Allocation.MipmapControl.MIPMAP_NONE,
                Allocation.USAGE_SCRIPT);

        final Allocation output = Allocation.createTyped(rs, input.getType());
        final ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, output.getElement());
        script.setRadius(BLUR_RADIUS_TWO);
        script.setInput(input);
        script.forEach(output);
        output.copyTo(bitmap);
        rs.destroy();
        return bitmap;
    }

}