addHeaderView in RecyclerView

As we all know there is addHeaderView in ListView to add header item. But there is no equivalent to this in RecyclerView. Here i am sharing short demo for addHeaderView in RecyclerView.

add dependency in build.gradle

compile 'com.android.support:recyclerview-v7:23.1.1'

1	compile 'com.android.support:recyclerview-v7:23.1.1'

add RecyclerView in your main xml

<android.support.v7.widget.RecyclerView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/list_recylclerview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<android.support.v7.widget.RecyclerView

xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/list_recylclerview"

android:layout_width="match_parent"

android:layout_height="match_parent" />

row_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#E5E5E5"
    android:padding="20dp">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Android Gig"
        android:textSize="18dp" />

    <TextView
        android:id="@+id/decription"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/title"
        android:textSize="14dp" />
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="#E5E5E5"

android:padding="20dp">

<TextView

android:id="@+id/title"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Android Gig"

android:textSize="18dp" />

<TextView

android:id="@+id/decription"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@id/title"

android:textSize="14dp" />

</RelativeLayout>

header.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/header_photo"
        android:src="@drawable/ic_launcher"
        android:layout_centerHorizontal="true"/>

    <TextView android:layout_below="@+id/header_photo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Android Gig"
        android:layout_marginTop="5dp"
        android:layout_centerHorizontal="true"
        android:textStyle="bold"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical" android:layout_width="match_parent"

android:layout_height="match_parent"

android:padding="10dp">

<ImageView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/header_photo"

android:src="@drawable/ic_launcher"

android:layout_centerHorizontal="true"/>

<TextView android:layout_below="@+id/header_photo"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Android Gig"

android:layout_marginTop="5dp"

android:layout_centerHorizontal="true"

android:textStyle="bold"

android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

Here is the code for your adapter class

public class CommentAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private static final int TYPE_HEADER = 0;
    private static final int TYPE_ITEM = 1;
    String[] data;

    public CommentAdapter(String[] data) {
        this.data = data;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == TYPE_ITEM) {
            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_layout, parent, false);
            return new VHItem(v);
        } else if (viewType == TYPE_HEADER) {
            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.header, parent, false);
            return new VHHeader(v);
        }

        throw new RuntimeException("there is no type that matches the type " + viewType + " + make sure your using types correctly");
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof VHItem) {
            String dataItem = getItem(position);
            //cast holder to VHItem and set data
            ((VHItem) holder).description.setText(dataItem);
        } else if (holder instanceof VHHeader) {
            //cast holder to VHHeader and set data for header.
        }
    }

    @Override
    public int getItemCount() {
        return data.length + 1;
    }

    @Override
    public int getItemViewType(int position) {
        if (isPositionHeader(position))
            return TYPE_HEADER;

        return TYPE_ITEM;
    }

    private boolean isPositionHeader(int position) {
        return position == 0;
    }

    private String getItem(int position) {
        return data[position - 1];
    }

    class VHItem extends RecyclerView.ViewHolder {
        TextView description;

        public VHItem(View itemView) {
            super(itemView);
            description=(TextView)itemView.findViewById(R.id.decription);
        }
    }

    class VHHeader extends RecyclerView.ViewHolder {

        public VHHeader(View itemView) {
            super(itemView);
        }
    }
}

public class CommentAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

private static final int TYPE_HEADER = 0;

private static final int TYPE_ITEM = 1;

String[] data;

public CommentAdapter(String[] data) {

this.data = data;

}

@Override

public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

if (viewType == TYPE_ITEM) {

View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_layout, parent, false);

return new VHItem(v);

} else if (viewType == TYPE_HEADER) {

View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.header, parent, false);

return new VHHeader(v);

}

throw new RuntimeException("there is no type that matches the type " + viewType + " + make sure your using types correctly");

}

@Override

public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

if (holder instanceof VHItem) {

String dataItem = getItem(position);

//cast holder to VHItem and set data

((VHItem) holder).description.setText(dataItem);

} else if (holder instanceof VHHeader) {

//cast holder to VHHeader and set data for header.

}

@Override

public int getItemCount() {

return data.length + 1;

}

@Override

public int getItemViewType(int position) {

if (isPositionHeader(position))

return TYPE_HEADER;

return TYPE_ITEM;

}

private boolean isPositionHeader(int position) {

return position == 0;

}

private String getItem(int position) {

return data[position - 1];

}

class VHItem extends RecyclerView.ViewHolder {

TextView description;

public VHItem(View itemView) {

super(itemView);

description=(TextView)itemView.findViewById(R.id.decription);

}

class VHHeader extends RecyclerView.ViewHolder {

public VHHeader(View itemView) {

super(itemView);

}

ItemDecoration.java for adding divider in RecyclerView

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private Drawable mDivider;

    public DividerItemDecoration(Context context) {
        mDivider = context.getResources().getDrawable(R.drawable.line_divider);
    }

    @Override
    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int left = parent.getPaddingLeft();
        int right = parent.getWidth() - parent.getPaddingRight();

        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = parent.getChildAt(i);

            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

            int top = child.getBottom() + params.bottomMargin;
            int bottom = top + mDivider.getIntrinsicHeight();

            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }
}

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

private Drawable mDivider;

public DividerItemDecoration(Context context) {

mDivider = context.getResources().getDrawable(R.drawable.line_divider);

}

@Override

public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {

int left = parent.getPaddingLeft();

int right = parent.getWidth() - parent.getPaddingRight();

int childCount = parent.getChildCount();

for (int i = 0; i < childCount; i++) {

View child = parent.getChildAt(i);

RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

int top = child.getBottom() + params.bottomMargin;

int bottom = top + mDivider.getIntrinsicHeight();

mDivider.setBounds(left, top, right, bottom);

mDivider.draw(c);

}

line_divider.xml for custom divider of RecyclerView

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <size
        android:width="0dp"
        android:height="10dp" />

    <solid android:color="@android:color/white" />

</shape>

<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android"

android:shape="rectangle">

<size

android:width="0dp"

android:height="10dp" />

</shape>

Finally initialize RecyclerView in your MainActivity and set adapter for it.

RecyclerView mRecyclerView = (RecyclerView)findViewById(R.id.list_recylclerview);
mRecyclerView.addItemDecoration(new DividerItemDecoration(this));

LinearLayoutManager mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());

String comments[]=new String[6];
comments[0]="Android Runtime Permission";
comments[1]="Inbox Style Notification Like Whatsapp";
comments[2]="Part of TextView clickable";
comments[3]="YouTube Integration with Android Studio";
comments[4]="Floting Labels : Text Input Layout";
comments[5]="Snackbar, Bye Bye Toast!";

CommentAdapter mAdapter = new CommentAdapter(comments);
mRecyclerView.setAdapter(mAdapter);

RecyclerView mRecyclerView = (RecyclerView)findViewById(R.id.list_recylclerview);

mRecyclerView.addItemDecoration(new DividerItemDecoration(this));

LinearLayoutManager mLayoutManager = new LinearLayoutManager(this);

mRecyclerView.setLayoutManager(mLayoutManager);

mRecyclerView.setItemAnimator(new DefaultItemAnimator());

String comments[]=new String[6];

comments[0]="Android Runtime Permission";

comments[1]="Inbox Style Notification Like Whatsapp";

comments[2]="Part of TextView clickable";

comments[3]="YouTube Integration with Android Studio";

comments[4]="Floting Labels : Text Input Layout";

comments[5]="Snackbar, Bye Bye Toast!";

CommentAdapter mAdapter = new CommentAdapter(comments);

mRecyclerView.setAdapter(mAdapter);

addHeaderView in RecyclerView

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Ravi Rupareliya

He loves to explore new technologies and have worked on Android, React Native, Action on Google and Flutter.

addHeaderView in RecyclerView

Ravi Rupareliya

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