Glide支持通过url加载本地图标

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

GlideIcon

package com.zhuguohui.app.lib.glide;

import android.util.Log;

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

/**
 * 
 * Created by zhuguohui
 * Date: 2024/6/5
 * Time: 13:43
 * Desc:
 * 
 */
 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;

/**
 * 
 * Created by zhuguohui
 * Date: 2024/6/5
 * Time: 13:38
 * Desc:
 * 
 */
 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;

/**
 * 
 * Created by zhuguohui
 * Date: 2024/6/5
 * Time: 11:22
 * Desc:
 * 
 */
 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;

/**
 * 
 * Created by zhuguohui
 * Date: 2024/6/5
 * Time: 11:11
 * Desc:
 * 
 */
 @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);
经过检测上面的bug是因为使用了第三方库
 CircleImageView