How to update a menu item shown in the ActionBar in Android

In this android programming source code example, we are going to update a menu item shown in the ActionBar in Android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to update a menu item shown in the ActionBar in Android.

activity_main.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="#ededed">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Option Menu"
        android:gravity="center"
        android:textSize="20sp"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Update Menu"
        android:background="@color/colorAccent"
        android:textColor="#ffffff"
        android:onClick="updateMenu"
        android:layout_alignParentBottom="true"/>

</RelativeLayout>

MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;


public class MenuActivity4 extends AppCompatActivity {
    private String nameOption = "Home";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu4);
    }

    @Override
    public boolean onPrepareOptionsMenu(final Menu menu) {
        menu.findItem(R.id.action_home).setTitle(nameOption);
        return super.onPrepareOptionsMenu(menu);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        MenuInflater inflater = getMenuInflater();inflater.inflate(R.menu.option_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        super.onOptionsItemSelected(item);
        switch(item.getItemId()){
            case R.id.action_home:
                //
                return true;
        }

        return true;
    }

    public void updateMenu(View view){
        nameOption = "Home1";
        Toast.makeText(MenuActivity4.this,"Menu Option Change", Toast.LENGTH_LONG).show();
        invalidateOptionsMenu();
    }

}

menu\option_menu.xml

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

    <item
        android:id="@+id/action_home"
        android:title="@string/home"
        android:orderInCategory="100"
        app:showAsAction="never" />

    <item
        android:id="@+id/action_blog"
        android:title="@string/blog"
        android:orderInCategory="100"
        app:showAsAction="never" />

    <item
        android:id="@+id/action_App"
        android:title="@string/App"
        android:orderInCategory="100"
        app:showAsAction="never" />
</menu>

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