序言

glide可以在load的时候传入一个资源id来加载本地图标，但是在开发过程中。还得区分数据类型来分别处理。这样的使用成本比较大。希望通过自定义ModelLoader实现通过自定义的url来加载Drawab。降低使用成本

实现

一共四个类

类名	作用
GlideIcon	通过自定义url的编码和提取值的作用
GlideIconModelLoader	自定义的ModelLocader实现自定义的url到drawable的获取过程
LocalFetcher	获取drawab
MyGlideModule	用来注册自定义的配置

GlideIcon

package com.zhuguohui.app.lib.glide;

import android.util.Log;

import com.zhuguohui.app.lib.app.BaseApp;

/**
 * <pre>
 * Created by zhuguohui
 * Date: 2024/6/5
 * Time: 13:43
 * Desc:
 * </pre>
 */
public class GlideIcon {

    static String ICON_START = "GlideIcon://";

    public static boolean isIcon(String url) {
        return url != null && url.startsWith(ICON_START);
    }

    public static String get(int drawableId) {

        return ICON_START + drawableId;
    }

    public static int getValue(String url) throws Exception {
        if (isIcon(url)) {

            String resourceName = url.substring(ICON_START.length());
            return Integer.parseInt(resourceName);

        }
        throw new IllegalArgumentException(url + " is not a glideIcon");
    }
}

GlideIconModeLoader

package com.zhuguohui.app.lib.glide;

import android.graphics.drawable.Drawable;

import com.bumptech.glide.load.Key;
import com.bumptech.glide.load.Options;
import com.bumptech.glide.load.model.ModelLoader;
import com.bumptech.glide.load.model.ModelLoaderFactory;
import com.bumptech.glide.load.model.MultiModelLoaderFactory;

import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;

/**
 * <pre>
 * Created by zhuguohui
 * Date: 2024/6/5
 * Time: 13:38
 * Desc:
 * </pre>
 */
public class GlideIconModeLoader implements ModelLoader<String, Drawable> {
    static class KeyImpl implements Key {

        String url;

        public KeyImpl(String url) {
            this.url = url;
        }

        @Override
        public void updateDiskCacheKey(MessageDigest messageDigest) {
            messageDigest.update(url.getBytes(StandardCharsets.UTF_8));
        }
    }

    @Override
    public LoadData<Drawable> buildLoadData(String s, int width, int height, Options options) {
        return new LoadData<>(new KeyImpl(s), new LocalFetcher(s));
    }



    @Override
    public boolean handles(String s) {
        return GlideIcon.isIcon(s);
    }

    public static ModelLoaderFactory<String, Drawable> factory=new ModelLoaderFactory<String, Drawable>() {
        @Override
        public ModelLoader<String, Drawable> build(MultiModelLoaderFactory multiFactory) {
            return new GlideIconModeLoader();
        }

        @Override
        public void teardown() {

        }
    };
}

LocalFetcher

package com.zhuguohui.app.lib.glide;

import android.graphics.drawable.Drawable;

import com.bumptech.glide.Priority;
import com.bumptech.glide.load.DataSource;
import com.bumptech.glide.load.data.DataFetcher;
import com.zhuguohui.app.lib.app.BaseApp;

import java.io.InputStream;
import java.util.BitSet;

/**
 * <pre>
 * Created by zhuguohui
 * Date: 2024/6/5
 * Time: 11:22
 * Desc:
 * </pre>
 */
public class LocalFetcher implements DataFetcher<Drawable> {

    String url;

    public LocalFetcher(String url) {
        this.url = url;
    }

    @Override
    public void loadData(Priority priority, DataCallback<? super Drawable> callback) {

        try {
            int id = GlideIcon.getValue(url);
            callback.onDataReady(BaseApp.app().getResources().getDrawable(id));

        } catch (Exception e) {
            callback.onLoadFailed(e);
        }


    }

    @Override
    public void cleanup() {

    }

    @Override
    public void cancel() {

    }

    @Override
    public Class<Drawable> getDataClass() {
        return Drawable.class;
    }

    @Override
    public DataSource getDataSource() {
        return DataSource.MEMORY_CACHE;
    }
}

MyGlideModule

package com.zhuguohui.app.lib.glide;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.Log;

import com.bumptech.glide.Glide;
import com.bumptech.glide.Registry;
import com.bumptech.glide.annotation.GlideModule;
import com.bumptech.glide.module.AppGlideModule;

import java.io.InputStream;

/**
 * <pre>
 * Created by zhuguohui
 * Date: 2024/6/5
 * Time: 11:11
 * Desc:
 * </pre>
 */
@GlideModule
public class MyGlideModule extends AppGlideModule {



    @Override
    public void registerComponents(Context context, Glide glide, Registry registry) {
        super.registerComponents(context, glide, registry);
        registry.prepend(String.class, Drawable.class, GlideIconModeLoader.factory);

    }


}

使用

注册

需要再gralde中导入下面两个依赖, 特别是 注解处理器没有这个无法注册

    //glide --start

    api 'com.github.bumptech.glide:glide:4.16.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
    //glide --end

代码中

直接这样用就行了

  String imageUrl = GlideIcon.get(R.mipmap.icon_xiaoxi_xitong);
                

位置

MyGlideModule 这个类可以在lib module中。

注意

bug

在使用 .transition(DrawableTransitionOptions.with(factory)) 实现淡入淡出的过程中发现第一次显示的时候无法显示本地图片。后来查了一下这是glide的bug。后面有空再来处理。

        Glide.with(getContext())
                .load(url)
//                .transition(DrawableTransitionOptions.with(factory))
                .apply(options)
                .into(imageView);