FadeInNetworkImageView.java

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.*;
import android.util.AttributeSet;

import com.android.volley.toolbox.NetworkImageView;

public class FadeInNetworkImageView extends NetworkImageView {

    private static final int FADE_TRANSITION_MILLISECONDS = 500;

    private static ColorDrawable cd = new ColorDrawable(android.R.color.transparent);
 
    public FadingNetworkImageView(Context context) {
        super(context);
    }
 
    public FadingNetworkImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
 
    public FadingNetworkImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }
 
    @Override
    public void setImageBitmap(Bitmap bitmap) {
        TransitionDrawable transitionDrawable = new TransitionDrawable(new Drawable[]{
                cd,
                new BitmapDrawable(getContext().getResources(),bitmap)
        });
        transitionDrawable.setCrossFadeEnabled(true);
        setImageDrawable(transitionDrawable);
        transitionDrawable.startTransition(FADE_TRANSITION_MILLISECONDS);
    }

}