Grayscale + CircularNetworkImageView

GrayscaleNetworkImageView.java

package com.wantedlab.android.wanted.helpers;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;

import com.android.volley.toolbox.NetworkImageView;

public class GrayscaleNetworkImageView extends NetworkImageView {
    Context mContext;

    public GrayscaleNetworkImageView(Context context) {
        super(context);
        mContext = context;
    }

    public GrayscaleNetworkImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
        mContext = context;
    }

    public GrayscaleNetworkImageView(Context context, AttributeSet attrs,
                                     int defStyle) {
        super(context, attrs, defStyle);
        mContext = context;
    }

    @Override
    public void setImageBitmap(Bitmap bm) {
        if(bm==null) return;
        setImageDrawable(new BitmapDrawable(mContext.getResources(),
                getGrayscaleBitmap(bm)));
    }

    /**
     * Creates a circular bitmap and uses whichever dimension is smaller to determine the width
     * <br/>Also constrains the circle to the leftmost part of the image
     *
     * @param bitmap
     * @return bitmap
     */
    public Bitmap getGrayscaleBitmap(Bitmap bitmap) {
        CircularNetworkImageView giv = new CircularNetworkImageView(mContext);
        Bitmap rounded = giv.getCircularBitmap(bitmap);

        Bitmap output = Bitmap.createBitmap(rounded.getWidth(), rounded.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        Paint paint = new Paint();
        ColorMatrix cm = new ColorMatrix();

        cm.setSaturation(0);

        ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);

        paint.setColorFilter(f);

        canvas.drawBitmap(rounded, 0,0, paint);

        return output;
    }

}

Requires CircularNetworkImageView https://gist.github.com/rghwang/13db490a07112cc99fa1