android option menu

activity_main.xml

1. <?xml version="1.0" encoding="utf-8"?>  
2. <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     xmlns:app="http://schemas.android.com/apk/res-auto"  
4.     xmlns:tools="http://schemas.android.com/tools"  
5.     android:layout_width="match_parent"  
6.     android:layout_height="match_parent"  
7.     tools:context="example.javatpoint.com.optionmenu.MainActivity">  
8.   
9.     <android.support.design.widget.AppBarLayout  
10.         android:layout_width="match_parent"  
11.         android:layout_height="wrap_content"  
12.         android:theme="@style/AppTheme.AppBarOverlay">  
13.   
14.         <android.support.v7.widget.Toolbar  
15.             android:id="@+id/toolbar"  
16.             android:layout_width="match_parent"  
17.             android:layout_height="?attr/actionBarSize"  
18.             android:background="?attr/colorPrimary"  
19.             app:popupTheme="@style/AppTheme.PopupOverlay" />  
20.   
21.     </android.support.design.widget.AppBarLayout>  
22.   
23.     <include layout="@layout/content_main" />  
24.   
25. </android.support.design.widget.CoordinatorLayout>  

context_main.xml

1. <?xml version="1.0" encoding="utf-8"?>  
2. <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     xmlns:app="http://schemas.android.com/apk/res-auto"  
4.     xmlns:tools="http://schemas.android.com/tools"  
5.     android:layout_width="match_parent"  
6.     android:layout_height="match_parent"  
7.     app:layout_behavior="@string/appbar_scrolling_view_behavior"  
8.     tools:context="example.javatpoint.com.optionmenu.MainActivity"  
9.     tools:showIn="@layout/activity_main">  
10.   
11.     <TextView  
12.         android:layout_width="wrap_content"  
13.         android:layout_height="wrap_content"  
14.         android:text="Hello World!"  
15.         app:layout_constraintBottom_toBottomOf="parent"  
16.         app:layout_constraintLeft_toLeftOf="parent"  
17.         app:layout_constraintRight_toRightOf="parent"  
18.         app:layout_constraintTop_toTopOf="parent" />  
19.   
20. </android.support.constraint.ConstraintLayout>  

menu_main.xml

1. <menu xmlns:android="http://schemas.android.com/apk/res/android"  
2.     xmlns:app="http://schemas.android.com/apk/res-auto"  
3.     xmlns:tools="http://schemas.android.com/tools"  
4.     tools:context="example.javatpoint.com.optionmenu.MainActivity">  
5.   
6.     <item  android:id="@+id/item1"  
7.         android:title="Item 1"/>  
8.     <item  android:id="@+id/item2"  
9.         android:title="Item 2"/>  
10.     <item  android:id="@+id/item3"  
11.         android:title="Item 3"  
12.         app:showAsAction="withText"/>  
13. </menu> 

1. public class MainActivity extends AppCompatActivity {  
2.   
3.     @Override  
4.     protected void onCreate(Bundle savedInstanceState) {  
5.         super.onCreate(savedInstanceState);  
6.         setContentView(R.layout.activity_main);  
7.         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);  
8.         setSupportActionBar(toolbar);  
9.     }  
10.   
11.     @Override  
12.     public boolean onCreateOptionsMenu(Menu menu) {  
13.         // Inflate the menu; this adds items to the action bar if it is present.  
14.         getMenuInflater().inflate(R.menu.menu_main, menu);  
15.         return true;  
16.     }  
17.   
18.     @Override  
19.     public boolean onOptionsItemSelected(MenuItem item) {  
20.        int id = item.getItemId();  
21.         switch (id){  
22.             case R.id.item1:  
23.                 Toast.makeText(getApplicationContext(),"Item 1 Selected",Toast.LENGTH_LONG).show();  
24.                 return true;  
25.             case R.id.item2:  
26.                 Toast.makeText(getApplicationContext(),"Item 2 Selected",Toast.LENGTH_LONG).show();  
27.                 return true;  
28.             case R.id.item3:  
29.                 Toast.makeText(getApplicationContext(),"Item 3 Selected",Toast.LENGTH_LONG).show();  
30.                 return true;  
31.             default:  
32.                 return super.onOptionsItemSelected(item);  
33.         }  
34.     }  
35. }