Android Simple Recycler view and cardView -android studio

using this code in

compile 'com.android.support:cardview-v7:25.0.0'

compile 'com.android.support:recyclerview-v7:25.0.0'

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'    })
    compile 'com.android.support:appcompat-v7:25.3.1'    
testCompile 'junit:junit:4.12'    
compile 'com.android.support:cardview-v7:25.0.0'    
compile 'com.android.support:recyclerview-v7:25.0.0'}



MainActivity.java

public class MainActivity extends AppCompatActivity {

    private ArrayList<String> names;
    private RecyclerView recyclerView;

    private RecyclerView.Adapter adapter;

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


        initView();
    }

    private void initView() {
        recyclerView = (RecyclerView) findViewById(R.id.recyid);
        recyclerView.setHasFixedSize(true);
        final RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.setLayoutManager(layoutManager);

        names = new ArrayList<>();
        for (int i = 1; i <= 50; i++) {
            names.add(i + " name");
        }
        adapter = new MyAdapter(names, this);
        recyclerView.setAdapter(adapter);
        recyclerView.setItemAnimator(new DefaultItemAnimator());

        recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {

            GestureDetector gestureDetector = new GestureDetector(getApplicationContext(), new GestureDetector.SimpleOnGestureListener() {

                @Override public boolean onSingleTapUp(MotionEvent e) {
                    return true;
                }

            });

            @Override            public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
                View child = rv.findChildViewUnder(e.getX(), e.getY());
                if(child != null && gestureDetector.onTouchEvent(e)) {
                    int position = rv.getChildAdapterPosition(child);
                    Toast.makeText(getApplicationContext(), names.get(position), Toast.LENGTH_SHORT).show();
                }
                return false;
            }

            @Override            public void onTouchEvent(RecyclerView rv, MotionEvent e) {

            }

            @Override            public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

            }
        });
    }




}



activity_main.xml


<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"
    tools:context="com.edupointbd.amirul.recyclercardviewdemo.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyid"        
        android:layout_width="wrap_content"       
      android:layout_height="wrap_content">
    </android.support.v7.widget.RecyclerView>
</LinearLayout>

cardviewrow.xml

--------------

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="wrap_content"    android:layout_height="wrap_content">

    <android.support.v7.widget.CardView        

android:id="@+id/cardid"        

android:layout_width="match_parent"       

 android:layout_height="wrap_content">

        <TextView            

android:id="@+id/txname"           

 android:textSize="30sp"            

android:text="hello"            

android:layout_width="match_parent"            

android:layout_height="wrap_content" />

    </android.support.v7.widget.CardView>
</LinearLayout>

MyAdapter.java

------------------

/** * Created by Amirul on 07-Oct-17. */
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {

    private ArrayList<String> names;
    private Context ct;

    MyAdapter(ArrayList<String> nana, Context context){
        names = nana;
        ct =context;
    }


    @Override    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardlayout,parent,false);

        return new ViewHolder(view);
    }

    @Override    public void onBindViewHolder(MyAdapter.ViewHolder holder, int position) {

        holder.textView.setText(names.get(position));

    }

    @Override    public int getItemCount() {
        return names.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView  textView;

        public ViewHolder(View itemView) {
            super(itemView);

            textView = (TextView)itemView.findViewById(R.id.txname);
        }
    }
}