Scroll, hide and show header in Android

The basic layout structure to make the scroll up and hide the header, scroll down and show the header. The header has to be AppBarLayout, the root view has to be CoordinatorLayout, the scroll view could be an RecyclerView or NestedScrollView or other scroll views. The child view in the AppBarLayout has to set app:layout_scrollFlags="scroll|enterAlways", and the scroll view has to set the layout behavior to app:layout_behavior="@string/appbar_scrolling_view_behavior"

The RecyclerView list item layout, list_item.xml

The layout file activity_scrolling.xml

The Activity class

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class ScrollingActivity extends AppCompatActivity {

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

        String [] numbers = {"One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};

        rvNumbers = (RecyclerView) findViewById(R.id.rv_numbers);
        rvNumbers.setLayoutManager(new LinearLayoutManager(this));
        rvNumbers.setAdapter(new RecyclerViewAdapter(numbers));
    }

    class RecyclerViewAdapter extends RecyclerView.Adapter {
        String listData[];

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

        @Override
        public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
            RecyclerViewAdapter.ViewHolder vh = new RecyclerViewAdapter.ViewHolder(v);
            return vh;
        }

        @Override
        public void onBindViewHolder(RecyclerViewAdapter.ViewHolder holder, int position) {
            holder.tvNumber.setText(listData[position]);
        }

        @Override
        public int getItemCount() {
            return listData.length;
        }

        class ViewHolder extends RecyclerView.ViewHolder {
            public TextView tvNumber;
            public ViewHolder(View v) {
                super(v);
                tvNumber = (TextView) v.findViewById(R.id.tv_number);
            }
        }
    }
}

Other Examples