GlideImageGetter uses Glide Image Library to load GIFs/JPG/PNG in HTML <img> tags into TextView

GlideImageGetter

import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.text.Html;
import android.view.View;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import com.bumptech.glide.load.resource.drawable.GlideDrawable;
import com.bumptech.glide.request.Request;
import com.bumptech.glide.request.RequestListener;
import com.bumptech.glide.request.animation.GlideAnimation;
import com.bumptech.glide.request.target.Target;
import com.bumptech.glide.request.target.ViewTarget;

import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public final class GlideImageGetter implements Html.ImageGetter, Drawable.Callback {

    private final Context mContext;

    private final TextView mTextView;

    private final Set<ImageGetterViewTarget> mTargets;

    public static GlideImageGetter get(View view) {
        return (GlideImageGetter)view.getTag(R.id.drawable_callback_tag);
    }

    public void clear() {
        GlideImageGetter prev = get(mTextView);
        if (prev == null) return;

        for (ImageGetterViewTarget target : prev.mTargets) {
            Glide.clear(target);
        }
    }

    public GlideImageGetter(Context context, TextView textView) {
        this.mContext = context;
        this.mTextView = textView;
        
        clear();
        mTargets = new HashSet<>();
        mTextView.setTag(R.id.drawable_callback_tag, this);
    }
    
    @Override
    public Drawable getDrawable(String url) {
        final UrlDrawable urlDrawable = new UrlDrawable();

        
		System.out.println("Downloading from: " + url);
		Glide.with(mContext)
				.load(url)
				.diskCacheStrategy(DiskCacheStrategy.ALL)
				.into(new ImageGetterViewTarget(mTextView, urlDrawable));
	

        return urlDrawable;

    }

    @Override
    public void invalidateDrawable(Drawable who) {
        mTextView.invalidate();
    }

    @Override
    public void scheduleDrawable(Drawable who, Runnable what, long when) {

    }

    @Override
    public void unscheduleDrawable(Drawable who, Runnable what) {

    }

    private class ImageGetterViewTarget extends ViewTarget<TextView, GlideDrawable> {

        private final UrlDrawable mDrawable;

        private ImageGetterViewTarget(TextView view, UrlDrawable drawable) {
            super(view);
            mTargets.add(this);
            this.mDrawable = drawable;
        }

        @Override
        public void onResourceReady(GlideDrawable resource, GlideAnimation<? super GlideDrawable> glideAnimation) {
            Rect rect;
            if (resource.getIntrinsicWidth() > 100) {
                float width;
                float height;
                System.out.println("Image width is " + resource.getIntrinsicWidth());
                System.out.println("View width is " + view.getWidth());
                if (resource.getIntrinsicWidth() >= getView().getWidth()) {
                    float downScale = (float) resource.getIntrinsicWidth() / getView().getWidth();
                    width = (float) resource.getIntrinsicWidth() / (float) downScale;
                    height = (float) resource.getIntrinsicHeight() / (float) downScale;
                } else {
                    float multiplier = (float) getView().getWidth() / resource.getIntrinsicWidth();
                    width = (float) resource.getIntrinsicWidth() * (float) multiplier;
                    height = (float) resource.getIntrinsicHeight() * (float) multiplier;
                }
                System.out.println("New Image width is " + width);


                rect = new Rect(0, 0, Math.round(width), Math.round(height));
            } else {
                rect = new Rect(0, 0, resource.getIntrinsicWidth() * 2, resource.getIntrinsicHeight() * 2);
            }
            resource.setBounds(rect);

            mDrawable.setBounds(rect);
            mDrawable.setDrawable(resource);


            if (resource.isAnimated()) {
                mDrawable.setCallback(get(getView()));
                resource.setLoopCount(GlideDrawable.LOOP_FOREVER);
                resource.start();
            }

            getView().setText(getView().getText());
            getView().invalidate();
        }

        private Request request;
        @Override
        public Request getRequest() {
            return request;
        }

        @Override
        public void setRequest(Request request) {
            this.request = request;
        }
    }
}

ids.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <item type="id" name="drawable_callback_tag"/>
</resources>

UrlDrawable

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.drawable.Drawable;
import com.bumptech.glide.load.resource.drawable.GlideDrawable;
 
 
final class UrlDrawable extends Drawable implements Drawable.Callback {
 
 
    private GlideDrawable mDrawable;
 
 
    @Override 
    public void draw(Canvas canvas) {
        if (mDrawable != null) {
            mDrawable.draw(canvas);
        } 
    } 
 
 
    @Override 
    public void setAlpha(int alpha) {
        if (mDrawable != null) {
            mDrawable.setAlpha(alpha);
        } 
    } 
 
 
    @Override 
    public void setColorFilter(ColorFilter cf) {
        if (mDrawable != null) {
            mDrawable.setColorFilter(cf);
        } 
    } 
 
 
    @Override 
    public int getOpacity() { 
        if (mDrawable != null) {
            return mDrawable.getOpacity();
        } 
        return 0; 
    } 
 
 
    public void setDrawable(GlideDrawable drawable) {
        if (this.mDrawable != null) {
            this.mDrawable.setCallback(null);
        } 
        drawable.setCallback(this);
        this.mDrawable = drawable;
    } 
 
 
    @Override 
    public void invalidateDrawable(Drawable who) {
        if (getCallback() != null) {
            getCallback().invalidateDrawable(who);
        } 
    }

    @Override 
    public void scheduleDrawable(Drawable who, Runnable what, long when) {
        if (getCallback() != null) {
            getCallback().scheduleDrawable(who, what, when);
        }
    }
 
 
    @Override 
    public void unscheduleDrawable(Drawable who, Runnable what) {
        if (getCallback() != null) {
            getCallback().unscheduleDrawable(who, what);
        } 
    } 
}