Sectioned RecyclerView

Additional

Language
Java
Version
2.1.1 (Nov 17, 2016)
Created
Oct 4, 2016
Updated
Oct 12, 2017 (Retired)
Owner
Intruder Shanky (IntruderShanky)
Contributor
Intruder Shanky (IntruderShanky)
1
Activity
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Source code
APK file

Promotion

Sectioned-RecyclerView

Easy implementation of RecyclerView with headers and items

Demo App - IS Library

Demo

Usage

Step 1. Add the JitPack repository to your build file
Add it in your root build.gradle at the end of repositories:
allprojects {
   repositories {
 ...
 maven { url "https://jitpack.io" }
   }
}
Step 2. Add the dependency
dependencies {
   compile 'com.github.IntruderShanky:Sectioned-RecyclerView:2.1.1'
}

Implementation

There are very easy and simple steps to implement.

Step 1. Add RecyclerView in layout file:
<android.support.v7.widget.RecyclerView
   android:id="@+id/recycler_view"
   android:layout_width="match_parent"
   android:layout_height="wrap_content" />
Step 2. Create another layout file for Section Header:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="26dp"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:orientation="vertical">

    <TextView
        android:id="@+id/section"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="16sp"
        android:textSize="16sp"
        android:textStyle="bold"/>
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_marginTop="5dp"
        android:background="#88424242"/>
</LinearLayout>
Step 3. Create another layout file for Section Child:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="8dp"
    android:orientation="vertical">

    <TextView
        android:id="@+id/child"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="16sp"
        android:text="mc sjcnscdj "
        android:padding="8dp"
        android:fontFamily="sans-serif-condensed"/>

</LinearLayout>
Step 4. Create a class for Section Child and named it. Here "Child.java"
public class Child {

    String name;

    public Child(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}
Step 5. Create a class for Section Header and implement it with Section. Here "Section.java"
public class SectionHeader implements Section<Child> {

    List<Child> childList;
    String sectionText;

    public SectionHeader(List<Child> childList, String sectionText) {
        this.childList = childList;
        this.sectionText = sectionText;
    }

    @Override
    public List<Child> getChildItems() {
        return childList;
    }

    public String getSectionText() {
        return sectionText;
    }
}
Step 6. Create a two ViewHolder classes to hold the views of section and child.
public class SectionViewHolder extends RecyclerView.ViewHolder {

    TextView name;
    public SectionViewHolder(View itemView) {
        super(itemView);
         name = (TextView) itemView.findViewById(R.id.section);
    }
}
public class ChildViewHolder extends RecyclerView.ViewHolder {

    TextView name;
    public ChildViewHolder(View itemView) {
        super(itemView);
        name = (TextView) itemView.findViewById(R.id.child);
    }
}
Step 7. Create a Adater for RecyclerView. Here "AdapterSectionRecycler.java"
public class AdapterSectionRecycler extends SectionRecyclerViewAdapter<SectionHeader, Child, SectionViewHolder, ChildViewHolder> {

    Context context;

    public AdapterSectionRecycler(Context context, List<SectionHeader> sectionItemList) {
        super(context, sectionItemList);
        this.context = context;
    }

    @Override
    public SectionViewHolder onCreateSectionViewHolder(ViewGroup sectionViewGroup, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.section_item, sectionViewGroup, false);
        return new SectionViewHolder(view);
    }

    @Override
    public ChildViewHolder onCreateChildViewHolder(ViewGroup childViewGroup, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item_layout, childViewGroup, false);
        return new ChildViewHolder(view);
    }

    @Override
    public void onBindSectionViewHolder(SectionViewHolder sectionViewHolder, int sectionPosition, SectionHeader section) {
        sectionViewHolder.name.setText(section.sectionText);
    }

    @Override
    public void onBindChildViewHolder(ChildViewHolder childViewHolder, int sectionPosition, int childPosition, Child child) {
        childViewHolder.name.setText(child.getName());
    }
}
Step 8. Here complete code of your Activity Class, Here "MainActivity.java"
public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;
    AdapterSectionRecycler adapterRecycler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //initialize RecyclerView
        recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        //setLayout Manager
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setHasFixedSize(true);

        //Create a List of Child DataModel
        List<Child> childList = new ArrayList<>();
        childList.add(new Child("April"));
        childList.add(new Child("Austin"));
        childList.add(new Child("Alex"));
        childList.add(new Child("Aakash"));

        //Create a List of Section DataModel implements Section
        List<SectionHeader> sections = new ArrayList<>();
        sections.add(new SectionHeader(childList, "A"));

        childList = new ArrayList<>();
        childList.add(new Child("Bill Gates"));
        childList.add(new Child("Bob Proctor"));
        childList.add(new Child("Bryan Tracy"));
        sections.add(new SectionHeader(childList, "B"));

        childList = new ArrayList<>();
        childList.add(new Child("Intruder Shanky"));
        childList.add(new Child("Invincible Vinod"));
        sections.add(new SectionHeader(childList, "I"));

        childList = new ArrayList<>();
        childList.add(new Child("Jim Carry"));
        sections.add(new SectionHeader(childList, "J"));

        childList = new ArrayList<>();
        childList.add(new Child("Neil Patrick Harris"));
        sections.add(new SectionHeader(childList, "N"));

        childList = new ArrayList<>();
        childList.add(new Child("Orange"));
        childList.add(new Child("Olive"));
        sections.add(new SectionHeader(childList, "O"));

        adapterRecycler = new AdapterSectionRecycler(this, sections);
        recyclerView.setAdapter(adapterRecycler);
    }
}

Data Change Methods

insertNewSection(Section)
insertNewSection(Section, int)
removeSection(int)
insertNewChild(Object, int)
insertNewChild(Object, int, int)
removeChild(int, int)

/* To notify the adapter for data change 
 * call notifyDataChanged(List) instead of 
 * notiftDatasetChanged()
 */ 
notifyDataChanged(List)

Licence

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.