从 url 获取图标和从 drawable 获取图标它仅从 drawable 获取

Question

我在 drawable 中添加了一些手动图标，对于某些手动数据，它必须使用 drawable，如果图标不在 drawable 中，则从 Glide.

我试过类似的东西，但只有它从 drawable 获取图标。

我想检查 drawable 处是否存在图标，如果 url 图标不在可绘制状态，则转到另一个语句并从 Glide 处获取.

下面是我的代码。
resID始终为0

String imageUrl = BASE_URL + arrayList.get(position).getSearchUrl() + "&size=32";

            int resID = context.getResources().getIdentifier("icon", "drawable",context.getPackageName());
            if (resID == 0) {
                Log.d("TAG", "onBindViewHolder: " + resID);
                viewHolder.tvIcon.setImageResource(arrayList.get(position).getIcon());
            } else {
                Log.d("TAG", "onBindViewHolder: Glide" + resID);
                Glide.with(context)
                        .load(imageUrl)
                        .apply(requestOptions
                                .placeholder(R.drawable.default_favicon)
                                .diskCacheStrategy(DiskCacheStrategy.ALL)
                                .fitCenter())
                        .into(viewHolder.tvIcon);
            }

Answer 1

int checkExistence = mContext.getResources().getIdentifier("my_resource_name", "drawable", mContext.getPackageName());

if ( `checkExistence != 0` ) {  // the resouce exists...
result = true;
}
else {  // checkExistence == 0  // the resouce does NOT exist!!
result = false;}

您正在使用resID == 0使用不等于零。checkExistence != 0

Answer 2

您需要在 context.getResources().getIdentifier()[= 中传递您的 arrayList.get(position).getIcon() 而不是 "icon" 18=]

另请阅读 getIdentifier() 的工作原理

Return a resource identifier for the given resource name. A fully qualified resource name is of the form "package:type/entry".

Returns : int The associated resource identifier. Returns 0 if no such resource was found. (0 is not a valid resource ID.)

试试这个方法

    int resID = context.getResources().getIdentifier(String.valueOf(arrayList.get(position).getIcon()), "drawable",context.getPackageName()); "drawable",context.getPackageName());
    // if resID == 0 means the icon is not available in drawable folder
    // so it will load icon from url using Glide
    if (resID == 0) {
        Log.d("TAG", "onBindViewHolder: Glide" + resID);
        Glide.with(context)
                .load(imageUrl)
                .apply(requestOptions
                        .placeholder(R.drawable.default_favicon)
                        .diskCacheStrategy(DiskCacheStrategy.ALL)
                        .fitCenter())
                .into(viewHolder.tvIcon);

    }
    // if resID != 0 means the icon is  available in drawable folder
    // so it will load icon from drawable folder
    else {
        Log.d("TAG", "onBindViewHolder: " + resID);
        viewHolder.tvIcon.setImageResource(resID);
    }

从 url 获取图标和从 drawable 获取图标它仅从 drawable 获取

Getting icon from url and icon from drawable it is taking only from drawable

android

android-adapter

android-glide