Listener for Gridview

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="androiindians.listview.MainActivity">


    <GridView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/grid"/>
</LinearLayout>

Custom.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:textColor="@color/colorAccent"
    android:textSize="20sp"
    android:layout_height="match_parent">
</TextView>

String.xml

<resources>
    <string name="app_name">ListView</string>

    <string-array name="aaa">
        <item>BBB</item>
        <item>CCCC</item>
        <item>DDDD</item>
        <item>EEEE</item>
    </string-array>
</resources>

MainActivity.java

package androiindians.listview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    GridView gridview;
    String[] Courses={"Android","CoreJava","Adv Java"};
    ArrayAdapter adp;

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

        String[] bbb=getResources().getStringArray(R.array.aaa);

        gridview = (GridView) findViewById(R.id.grid);

        adp=new ArrayAdapter(MainActivity.this,
                R.layout.custom,bbb);
        gridview.setAdapter(adp);

        gridview.setOnItemClickListener(
                new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(
                    AdapterView<?> parent, View view, int position, long id) {

                Toast.makeText(MainActivity.this,"position="+position+" "+"id"+id,Toast.LENGTH_LONG).show();

            }
        });

        /* either you can use above or this
gridview.setOnItemSelectedListener(
                new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(
                    AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(
                        MainActivity.this,
                        "position="+position+" "+"id"+id,Toast.LENGTH_LONG).show();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });*/
    }