An Android library to retrofit multiple item view types
Previously, when we need to develop a complex RecyclerView/ListView, it is a boring and troublesome work.
We should override the getItemViewType of RecyclerView.Adapter and add some types,
then we create some ViewHolder to relate the type, all of the process it is a very bad experience.
And once we need to add a new type, we have to go to the original Adapter and modify some old codes, so sad.
Today, I create a new graceful way to easily develop the complex RecyclerView/ListView, with my MultiType library, no matter how complex and how frequently changing list, we could insert a new type without changing the old codes.
In your build.gradle:
dependencies {
compile 'me.drakeet.multitype:multitype:1.1-beta2'
}public class TextItemContent implements ItemContent, Savable {
@NonNull public String text;
public TextItemContent(@NonNull String text) {
this.text = text;
}
public TextItemContent(@NonNull byte[] data) {
init(data);
}
@Override public void init(@NonNull byte[] data) {
String json = new String(data);
this.text = new Gson().fromJson(json, TextItemContent.class).text;
}
@NonNull @Override public byte[] toBytes() {
return new Gson().toJson(this).getBytes();
}
}public class TextItemViewProvider extends ItemViewProvider<TextItemContent> {
private static class ViewHolder extends ItemViewProvider.ViewHolder {
@NonNull final TextView text;
ViewHolder(@NonNull View itemView) {
super(itemView);
this.text = (TextView) itemView.findViewById(R.id.text);
}
}
@NonNull @Override
protected View onCreateView(@NonNull LayoutInflater inflater, @NonNull ViewGroup parent) {
View root = inflater.inflate(R.layout.item_text, parent, false);
ViewHolder holder = new ViewHolder(root);
root.setTag(holder);
return root;
}
@Override
protected void onBindView(
@NonNull View view, @NonNull TextItemContent content, @NonNull TypeItem typeItem) {
ViewHolder holder = (ViewHolder) view.getTag();
holder.text.setText("hello: " + content.text);
}
}Step 3. You do not need to create another new class. Just add a RecyclerView and List<TypeItem> to you Activity, for example:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.list);
itemFactory = new TypeItemFactory.Builder().build();
TypeItem textItem = itemFactory.newItem(new TextItemContent("world"));
TypeItem imageItem = itemFactory.newItem(new ImageItemContent(R.mipmap.ic_launcher));
TypeItem richItem = itemFactory.newItem(new RichItemContent("小艾大人赛高", R.mipmap.avatar));
List<TypeItem> typeItems = new ArrayList<>(80);
for (int i = 0; i < 20; i++) {
typeItems.add(textItem);
typeItems.add(imageItem);
typeItems.add(richItem);
}
/* register the types before setAdapter, that's all right */
ItemTypePool.register(TextItemContent.class, new TextItemViewProvider());
ItemTypePool.register(ImageItemContent.class, new ImageItemViewProvider());
ItemTypePool.register(RichItemContent.class, new RichItemViewProvider());
recyclerView.setAdapter(new TypeItemsAdapter(typeItems));
}You're good to go!
You could check the sample module for more details and after running it will look like:
Copyright 2016 drakeet.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.