AppIconDecoder.java

package com.pitchedapps.butler.iconrequest.glide;

import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

import com.bumptech.glide.load.ResourceDecoder;
import com.bumptech.glide.load.engine.Resource;
import com.bumptech.glide.load.resource.drawable.DrawableResource;
import com.bumptech.glide.util.Util;
import com.pitchedapps.butler.iconrequest.App;

import java.io.IOException;

/**
 * Created by Allan Wang on 2016-08-20.
 */
class AppIconDecoder implements ResourceDecoder<App, Drawable> {

    private final Context context;
    private final String mPkg;

    public AppIconDecoder(Context context, String pkg) {
        this.context = context;
        this.mPkg = pkg;
    }

    @Override
    public Resource<Drawable> decode(App source, int width, int height) throws IOException {
        final Drawable icon;
        try {
            icon = context.getPackageManager().getApplicationIcon(source.getPackage());
        } catch (PackageManager.NameNotFoundException e) {
            throw new IOException("Unable to load app icon for " + source.getPackage());
        }
        return new DrawableResource<Drawable>(icon) {
            @Override
            public int getSize() {
                if (drawable instanceof BitmapDrawable) {
                    return Util.getBitmapByteSize(((BitmapDrawable) drawable).getBitmap());
                } else {
                    return 1;
                }
            }

            @Override
            public void recycle() {
            }
        };
    }

    @Override
    public String getId() {
        return "ApplicationIconDecoder_" + mPkg;
    }
}