MultiType

An Android library to retrofit multiple item view types

English Version | 《Android 复杂的列表视图新写法 · 详解篇》

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.

sample screenshots(示例程序截图)

Getting started

In your build.gradle:

dependencies {
    compile 'me.drakeet.multitype:multitype:2.5.0'
}

NOTE: If you are updating from v2.4.0 to v2.5.0, note that the setItems(items) method has removed the notifyDataSetChanged() and you need to call it by yourself.

Usage

Step 1. Create a class, It would be your data model/Java bean, for example:

public class TextItem {

    @NonNull public String text;

    public TextItem(@NonNull final String text) {
        this.text = text;
    }
}

Step 2. Create a class extends ItemViewBinder<T, VH extends ViewHolder>, for example:

public class TextItemViewBinder
    extends ItemViewBinder<TextItem, TextItemViewBinder.TextHolder> {

    static class TextHolder extends RecyclerView.ViewHolder {
        @NonNull private final TextView text;

        TextHolder(@NonNull View itemView) {
            super(itemView);
            this.text = (TextView) itemView.findViewById(R.id.text);
        }
    }

    @NonNull @Override
    protected TextHolder onCreateViewHolder(
        @NonNull LayoutInflater inflater, @NonNull ViewGroup parent) {
        View root = inflater.inflate(R.layout.item_text, parent, false);
        return new TextHolder(root);
    }

    @Override
    protected void onBindViewHolder(@NonNull TextHolder holder, @NonNull TextItem textItem) {
        holder.text.setText("hello: " + textItem.text);
        Log.d("demo", "position: " + getPosition(holder));
        Log.d("demo", "adapter: " + getAdapter().toString());
    }
}

Step 3. You do not need to create another new class. Just register your types and add a RecyclerView and List<Object> to your Activity, for example:

public class NormalActivity extends AppCompatActivity {

    private MultiTypeAdapter adapter;

    @Override protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.list);

        adapter = new MultiTypeAdapter();
        adapter.register(TextItem.class, new TextItemViewBinder());
        adapter.register(ImageItem.class, new ImageItemViewBinder());
        adapter.register(RichItem.class, new RichItemViewBinder());
        recyclerView.setAdapter(adapter);

        TextItem textItem = new TextItem("world");
        ImageItem imageItem = new ImageItem(R.mipmap.ic_launcher);
        RichItem richItem = new RichItem("小艾大人赛高", R.mipmap.avatar);

        Items items = new Items();
        for (int i = 0; i < 20; i++) {
            items.add(textItem);
            items.add(imageItem);
            items.add(richItem);
        }
        adapter.setItems(items);
        adapter.notifyDataSetChanged();
    }
}

You're good to go!

Change Log

https://github.com/drakeet/MultiType/releases

Wiki

Android Studio Plugin

• drakeet/MultiTypeTemplates

An intellij idea plugin for Android to generate MultiType Item and ItemViewBinder easily.

Sample screenshots

You could check the sample module for more details and after running it will look like:

And it has been used in drakeet/TimeMachine:

Change logs & Releases

https://github.com/drakeet/MultiType/releases

License

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.