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Too much boilerplate and effort to implement a list using RecyclerView. But, most of them can be omitted.
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README.md

NoAdapter

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Too much boilerplate and effort to implement a list using RecyclerView. But, most of them can be omitted. This library will help you to focus on what should be display on the list instead of how.

  • Eliminate boilerplate code to create Adapter.
  • Eliminate boilerplate code to select view type and view holder.
  • Eliminate boilerplate code to calculate diff to update the list.
  • Diff calculation will be performed on background thread when list have more than 50 items.
  • And many more.

Table of contents

Demo

Sample app demo gif

Why NoAdapter

  • You'll never have to implement Adapter for RecyclerView anymore.
  • Never worry about notifyChanged anymore. We used DiffUtil to calculate and notify changes for you.

Single View Type

1. Implement ViewHolder

item_text.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="60dp"
  android:layout_margin="8dp"
  app:cardElevation="4dp">

  <TextView
    android:id="@+id/text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:textAppearance="@style/Base.TextAppearance.AppCompat.Body2"
  />
</android.support.v7.widget.CardView>

TextViewHolder.java

public class TextViewHolder extends AbsViewHolder {
  private final TextView text;

  private TextViewHolder(View view) {
    super(view);
    text = ((TextView) view.findViewById(R.id.text));
    // Set "this" to clickListener then it'll be delegated to Adapter
    view.setOnClickListener(this);
  }

  public static TextViewHolder create(ViewGroup parent) {
    final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    final View view = inflater.inflate(R.layout.item_text, parent, false);
    return new TextViewHolder(view);
  }

  @Override public void bind(Object item) {
    super.bind(item);
    text.setText((String) item);
  }
}

2. Setup Adapter

adapter = new OnlyAdapter.Builder()
    .viewHolderFactory(new ViewHolderFactory() {
      @Override public AbsViewHolder viewHolderForType(ViewGroup parent, int type) {
        return TextViewHolder.create(parent);
      }
    })
    .onItemClickListener(new OnItemClickListener() {
      @Override public void onItemClick(View view, Object item, int position) {
        Toast
            .makeText(MainActivity.this, "Clicked on item: " + item, Toast.LENGTH_SHORT)
            .show();
      }
    })
    .build();
rvList.setAdapter(adapter);

3. Bind data

final List<String> items = Arrays.asList(
    "Text #1",
    "Text #2",
    "Text #3",
    "Text #4",
    "Text #5"
);
adapter.setItems(items);

Multiple View Type

1. ViewHolder

1.1 Color item

item_color.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent" android:layout_height="60dp"
  android:layout_margin="8dp"
  app:cardElevation="4dp"/>

ColorViewHolder.java

public class ColorViewHolder extends AbsViewHolder {

  private ColorViewHolder(View view) {
    super(view);
    // Set "this" to clickListener then it'll delegate to Adapter
    view.setOnClickListener(this);
  }

  public static ColorViewHolder create(ViewGroup parent) {
    final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    final View view = inflater.inflate(R.layout.item_color, parent, false);
    return new ColorViewHolder(view);
  }

  @Override public void bind(Object item) {
    super.bind(item);
    // Set up display for data
    itemView.setBackgroundColor(((Color) item).getValue());
  }
}

1.2. Text item

item_text.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="60dp"
  android:layout_margin="8dp"
  app:cardElevation="4dp">

  <TextView
    android:id="@+id/text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:textAppearance="@style/Base.TextAppearance.AppCompat.Body2"
  />
</android.support.v7.widget.CardView>

TextViewHolder.java

public class TextViewHolder extends AbsViewHolder {
  private final TextView text;

  private TextViewHolder(View view) {
    super(view);
    text = ((TextView) view.findViewById(R.id.text));
    // Set "this" to clickListener then it'll be delegated to Adapter
    view.setOnClickListener(this);
  }

  public static TextViewHolder create(ViewGroup parent) {
    final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    final View view = inflater.inflate(R.layout.item_text, parent, false);
    return new TextViewHolder(view);
  }

  @Override public void bind(Object item) {
    super.bind(item);
    text.setText((String) item);
  }
}

2. Setup Adapter

adapter = new OnlyAdapter.Builder()
    .typeFactory(new TypeFactory() {
      @Override public int typeOf(Object item) {
        return item instanceof Color ? 1 : 0;
      }
    })
    .viewHolderFactory(new ViewHolderFactory() {
      @Override public AbsViewHolder viewHolderForType(ViewGroup parent, int type) {
        switch (type) {
          case 1:
            return ColorViewHolder.create(parent);
          default:
            return TextViewHolder.create(parent);
        }
      }
    })
    .onItemClickListener(new OnItemClickListener() {
      @Override public void onItemClick(View view, Object item, int position) {
        Toast
            .makeText(MainActivity.this, "Clicked on item: " + item, Toast.LENGTH_SHORT)
            .show();
      }
    })
    .diffCallback(new DiffCallback() {
      @Override public boolean areItemsTheSame(Object oldItem, Object newItem) {
        if (oldItem instanceof Color) {
          return newItem instanceof Color
              && ((Color) oldItem).getId() == ((Color) newItem).getId();
        } else {
          return oldItem.equals(newItem);
        }
      }

      @Override public boolean areContentsTheSame(Object oldItem, Object newItem) {
        return oldItem.equals(newItem);
      }
    })
    .build();
rvList.setAdapter(adapter);

3. Bind data

final List<Object> items = Arrays.asList(
    new Color(1, randomColor()),
    new Color(2, randomColor()),
    "Text #3",
    new Color(4, randomColor()),
    "Text #5"
);
adapter.setItems(items);

Use with Data Binding

1. Implement Layout + Binding

item_text.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>
<data>
  <variable
    name="item"
    type="java.lang.String"/>
  <variable
    name="onClick"
    type="android.view.View.OnClickListener"/>
</data>
<android.support.v7.widget.CardView
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="60dp"
  android:layout_margin="8dp"
  android:onClick="@{onClick}"
  app:cardElevation="4dp">

  <TextView
    android:id="@+id/text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:text="@{item}"
    android:textAppearance="@style/Base.TextAppearance.AppCompat.Body2"
  />
</android.support.v7.widget.CardView>
</layout>

NOTE:

  • item, onClick are predefined
  • item represented for data
  • onClick represented for onClickListener

2. Setup Adapter

adapter = new BindingBuilder()
        .layoutFactory(new LayoutFactory() {
          @Override public int layoutOf(Object item) {
            return R.layout.item_text;
          }
        })
        .onItemClickListener(new OnItemClickListener() {
          @Override public void onItemClick(View view, Object item, int position) {
            Toast
                .makeText(MainActivity.this, "Clicked on item: " + item, Toast.LENGTH_SHORT)
                .show();
          }
        })
        .build();
rvList.setAdapter(adapter);

3. Bind data

final List<String> items = Arrays.asList(
    "Text #1",
    "Text #2",
    "Text #3",
    "Text #4",
    "Text #5"
);
adapter.setItems(items);

See more in the sample

Download

Download the latest JAR or grab via Gradle:

compile 'vn.tiki.noadapter2:noadapter:2.0.2'
// Use with data binding
compile 'vn.tiki.noadapter2:noadapter-databinding:2.0.2'

Snapshots of the development version are available in Sonatype's snapshots repository.

ProGuard

No specific

License

Copyright 2016 Tiki Corp

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.
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