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 It is used to provide navigation on Android Application

OptionMenuActivity.Java 

package com.example.customdrawer;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class OptionMenuActivity extends AppCompatActivity {

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

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.home) {
Toast.makeText(getApplicationContext(),"home",Toast.LENGTH_LONG).show();
}
else if (id == R.id.about) {
Toast.makeText(getApplicationContext(),"about us",Toast.LENGTH_LONG).show();
}
else if (id == R.id.contact) {
Toast.makeText(getApplicationContext(),"contact us",Toast.LENGTH_LONG).show();
}
return super.onOptionsItemSelected(item);
}
}


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"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.myapplication.MainActivity">
<item
android:id="@+id/home"
android:orderInCategory="100"
android:title="HOME"
app:showAsAction="never" />

<item
android:id="@+id/about"
android:orderInCategory="100"
android:title="About US"
app:showAsAction="never" />

<item
android:id="@+id/contact"
android:orderInCategory="100"
android:title="Contact US"
app:showAsAction="never" />
</menu>


POPUPMENU:-
package com.example.customdrawer;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.PopupMenu;
import android.widget.Toast;

public class Popupmenuactivity extends AppCompatActivity {

Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_popupmenuactivity);
btn = findViewById(R.id.btnpopmenu);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
PopupMenu popup = new PopupMenu(Popupmenuactivity.this, btn);
popup.getMenuInflater().inflate(R.menu.menu, popup.getMenu());
popup.show();
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
Toast.makeText(getApplicationContext(),"You Clicked : " + item.getTitle(), Toast.LENGTH_SHORT).show();
return true;

}
});
}
});

}
}

XML FILE:-
<?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=".Popupmenuactivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnpopmenu"
android:text="Click"></Button>

</LinearLayout>

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"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.myapplication.MainActivity">
<item
android:id="@+id/home"
android:orderInCategory="100"
android:title="HOME"
app:showAsAction="never" />

<item
android:id="@+id/about"
android:orderInCategory="100"
android:title="About US"
app:showAsAction="never" />

<item
android:id="@+id/contact"
android:orderInCategory="100"
android:title="Contact US"
app:showAsAction="never" />
</menu>






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