RSBlur.java

package com.example.gitnb.module.custom;

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

/**
 * Copyright (C) 2015 Wasabeef
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class RSBlur {

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
    public static Bitmap blur(Context context, Bitmap bitmap, int radius) throws RSRuntimeException {
        RenderScript rs = null;
        try {
            rs = RenderScript.create(context);
            Allocation input =
                    Allocation.createFromBitmap(rs, bitmap, Allocation.MipmapControl.MIPMAP_NONE,
                            Allocation.USAGE_SCRIPT);
            Allocation output = Allocation.createTyped(rs, input.getType());
            ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));

            blur.setInput(input);
            blur.setRadius(radius);
            blur.forEach(output);
            output.copyTo(bitmap);
        } finally {
            if (rs != null) {
                rs.destroy();
            }
        }

        return bitmap;
    }
}