EffectBlur Picasso

EffectBlur

import android.content.Context;
import android.graphics.Bitmap;
import android.support.v8.renderscript.Allocation;
import android.support.v8.renderscript.Element;
import android.support.v8.renderscript.RenderScript;
import android.support.v8.renderscript.ScriptIntrinsicBlur;

import com.squareup.picasso.Transformation;

/*This code was not written by me but is really good,I found the way to do Compatible with sdkVersion 15!
 You can use this form
 1-  add dependece  compile 'com.squareup.picasso:picasso:2.5.2'
 2-  defaultConfig {
        applicationId ...
        minSdkVersion 15  // This code can be used with API 15
        targetSdkVersion 22
        renderscriptTargetApi 19
        renderscriptSupportModeEnabled true
        versionCode ...
        versionName ...
    }
 3-   Picasso.with(context).load("url").transform(new EffectBlur(context, radiusBlur)).into(ImageView); 
 
 */

public class EffectBlur implements Transformation {

    protected static final int UP_LIMIT = 25;
    protected static final int LOW_LIMIT = 1;
    protected final Context context;
    protected final int blurRadius;


    public EffectBlur(Context context, int radius) {
        this.context = context;

        if(radius<LOW_LIMIT){
            this.blurRadius = LOW_LIMIT;
        }else if(radius>UP_LIMIT){
            this.blurRadius = UP_LIMIT;
        }else
            this.blurRadius = radius;
    }

    @Override
    public Bitmap transform(Bitmap source) {
        Bitmap sourceBitmap = source;

        Bitmap blurredBitmap;
        blurredBitmap = Bitmap.createBitmap(sourceBitmap);

        RenderScript renderScript = RenderScript.create(context);

        Allocation input = Allocation.createFromBitmap(renderScript,
                sourceBitmap,
                Allocation.MipmapControl.MIPMAP_FULL,
                Allocation.USAGE_SCRIPT);



        Allocation output = Allocation.createTyped(renderScript, input.getType());

        ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(renderScript,
                Element.U8_4(renderScript));

        script.setInput(input);
        script.setRadius(blurRadius);

        script.forEach(output);
        output.copyTo(blurredBitmap);

        return blurredBitmap;
    }

    @Override
    public String key() {
        return "blurred";
    }
}