How to set a blurimage Library

I am trying to set a blur image library from https://github.com/Cutta/Simple-Image-Blur/blob/master/app/src/main/java/com/example/cunoraz/ViewPagerAdapter.java here I am just making one image blur from the image view I set the image in src but I am getting a run time error here is my java code

public class MainActivity extends AppCompatActivity {
Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
   ImageView imageview = (ImageView) findViewById(R.id.imageView);


    BitmapDrawable drawable = (BitmapDrawable) imageview.getDrawable();
    Bitmap bitmap = drawable.getBitmap();

    Bitmap blurred = blurRenderScript(bitmap, 25);//second parametre is radius
    imageview.setImageBitmap(blurred);

}
@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(context);

    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();

    retu 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());
    retu result;
}
}

But as per my knowledge the problem is in

RenderScript renderScript = RenderScript.create(context);

line But I dont know how to fix this