How to add an item to GridView dynamically in Android

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#71c6ab"     >     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Add Item : Itchweed"         />     <GridView         android:id="@+id/gv"         android:layout_width="675dp"         android:layout_height="wrap_content"         android:padding="5dp"         android:numColumns="3"         android:background="#e8ea63"         android:verticalSpacing="5dp"         android:horizontalSpacing="5dp"         android:gravity="left"         android:layout_below="@id/btn"         >     </GridView> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.GridView;  import java.util.ArrayList; import java.util.Arrays; import java.util.List;  import android.widget.Toast;   public class MainActivity extends Activity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         GridView gv = (GridView) findViewById(R.id.gv);         Button btn = (Button) findViewById(R.id.btn);          // Initializing a new String Array         String[] plants = new String[]{                 "Catalina ironwood",                 "Cabinet cherry",                 "Pale corydalis",                 "Pink corydalis",                 "Land cress",                 "Coast polypody",                 "Water fern"         };          // Populate a List from Array elements         selesai List<String> plantsList = new ArrayList<String>(Arrays.asList(plants));          // Create a new ArrayAdapter         selesai ArrayAdapter<String> gridViewArrayAdapter = new ArrayAdapter<String>                 (this,android.R.layout.simple_list_item_1, plantsList);          // Data bind GridView with ArrayAdapter (String Array elements)         gv.setAdapter(gridViewArrayAdapter);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Add/insert item to ArrayAdapter                 // Insert at the end of ArrayAdapter                 // ArrayAdapter is zero based index                 plantsList.add(plantsList.size(),"Itchweed");                  // Update the GridView                 gridViewArrayAdapter.notifyDataSetChanged();                  // Get the newly added item from ArrayAdapter                 String addedItemText = plantsList.get(plantsList.size()-1);                  // Confirm the addition                 Toast.makeText(getApplicationContext(),                         "Item added : " + addedItemText, Toast.LENGTH_SHORT).show();             }         });     } }
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