问题
- I have a parsed
XMLwhich I have read data from there. I have manually declared some data and the other data will be saved by the user. - I have declared with glide but it is not getting the right icon or when there is no internet the icons are hidden.
- The declared the xml they have the icons at the drawable and when I parse they are readable and I can show.
What I want is there any option to take the favicon and save to drawable or to an internal storage or cache so I can read even if I dont have internet. The items which are declared manually and parsed for them take the icon from drawable but for the others take the favicon from url.
Here is what I have tried so far.
The Pojo.class
public class Bookmark implements Parcelable, Comparable {
String name, id, nativeUrl, searchUrl;
long db_id;
int icon;
int viewType;
// Constructor, getters, setters & other default functions are omitted for simplicity.
}
The Adapter.class
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
ArrayList<Bookmark> arrayList;
BookmarkDB bookmarkDB;
public static final int ITEM_TYPE_ONE = 0;
public static final int ITEM_TYPE_TWO = 1;
boolean connected = false;
String BASE_URL = "https://besticon-demo.herokuapp.com/icon?url=";
public MyAdapter(Context context, ArrayList<Bookmark> arrayList) {
this.context = context;
this.arrayList = arrayList;
}
private boolean switchOnOff;
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = null;
if (viewType == ITEM_TYPE_ONE) {
view = LayoutInflater.from(context).inflate(R.layout.grid_item, parent, false);
return new ViewHolder(view);
} else if (viewType == ITEM_TYPE_TWO) {
view = LayoutInflater.from(context).inflate(R.layout.add_bookmark, parent, false);
return new ButtonViewHolder(view);
} else {
return null;
}
}
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, final int position) {
final int itemType = getItemViewType(position);
if (itemType == ITEM_TYPE_ONE) {
final ViewHolder viewHolder = (ViewHolder) holder;
viewHolder.tvName.setText(arrayList.get(position).getName());
RequestOptions requestOptions = new RequestOptions();
bookmarkDB = new BookmarkDB(context);
viewHolder.tvIcon.setImageResource(arrayList.get(position).getIcon());
Glide.with(context)
.load(BASE_URL+arrayList.get(position).getSearchUrl() + "&size=32;")
.apply(requestOptions)
.into(viewHolder.tvIcon);
viewHolder.tvIcon.setImageResource(arrayList.get(position).getIcon());
viewHolder.tvId.setText(arrayList.get(position).getId());
viewHolder.tvSearchUrl.setText(arrayList.get(position).getSearchUrl());
} else if (itemType == ITEM_TYPE_TWO) {
ButtonViewHolder buttonViewHolder = (ButtonViewHolder) holder;
buttonViewHolder.imgButton.setImageResource(arrayList.get(position).getIcon());
}
}
@Override
public int getItemViewType(int position) {
// Based on you list you will return the ViewType
if (arrayList.get(position).getViewType() == 0) return ITEM_TYPE_ONE;
else return ITEM_TYPE_TWO;
}
}
Ass you can see at the Adapter.class
// This get the icon from drawable and it sets to parsed array.
viewHolder.tvIcon.setImageResource(arrayList.get(position).getIcon());
// This gets the icon from URL and sets it to the parsed array but only when the user has internet.
Glide.with(context)
.load(BASE_URL+arrayList.get(position).getSearchUrl() + &size=32;")
.apply(requestOptions)
.into(viewHolder.tvIcon);
This is the declared XML which I have parsed, the file it is declared under res/xml/bookmarks.xml
<Bookmarks>
<Bookmark name="Bing" hidden="" icon="bing" id="0" nativeUrl="" searchUrl="https://www.bing.com" />
<Bookmark name="Google" hidden="" icon="google" id="1" nativeUrl="" searchUrl="https://www.google.com" />
<Bookmark name="Youtube" hidden="" icon="youtube" id="2" nativeUrl="" searchUrl="http://m.youtube.com" />
</Bookmarks>
回答1:
So if I have understood correctly, you have two problems.
- The default icon is not showing (i.e. hidden) when there is no internet.
- You want to show the images once loaded even if there is no internet.
Both of these two can be achieved using Glide with minimal change in your code. Just change the image loading portion of your code using Glide like the following.
String imageUrl = BASE_URL + arrayList.get(position).getSearchUrl() + "&size=32";
Glide.with(context)
.load(imageUrl)
.diskCacheStrategy(DiskCacheStrategy.ALL)
.placeholder(R.drawable.placeholder)
.into(viewHolder.tvIcon);
DiskCacheStrategy.ALL manages the caching of your images and should load the images even if the device is offline. Setting the placeholder using the .placeholder(R.drawable.placeholder) can be used, when the images are not loaded for internet problem and hence you want to show a default image instead.
If you want to read more about the caching strategies, this link can help as well.
Update 1
Based on your comment, I think you should have an if statement here. When the drawable is available locally, then you will use the setImageResource function, else use Glide to load the image.
Update 2
You do not have to save the images locally if you are using Glide with DiskStrategy.ALL. It will cache the images and will show automatically when the internet connection is not available. I would like to suggest you to remove the manual setup.
Update 3
If you want to use some of the icons from your own drawable, then you might consider putting something like this.
if (theIconIsAvailableInDrawable) showThatFromDrawable();
else useGlideToShowTheIconFromUrlUsingDiskCacheStrategy();
Hope you get the idea.
来源：https://stackoverflow.com/questions/54536787/unable-to-get-favicon-from-url-when-mobile-does-not-have-any-internet-or-is-it-p