Menu of Android learning notes

1. Normal Menu
Let's take a look at how to implement the simplest Menu.
Override the onCreateOptionsMenu (Menu menu) method in the main Activity.
 
@ Override
Public boolean onCreateOptionsMenu (Menu menu ){
// TODO Auto-generated method stub
// Menu. add (0, 1, R. string. exit );
// Menu. add (0, 2, R. string. about );
Menu. add (0, 1, 1, "apple ");
Menu. add (0, 2, 2, "banana ");
Return super. onCreateOptionsMenu (menu );
}
 
 
In this way, two menu options are available. To add a click event, override the onOptionsItemSelected (MenuItem item) method.
 
@ Override
Public boolean onOptionsItemSelected (MenuItem item ){
If (item. getItemId () = 1 ){
Toast t = Toast. makeText (this, "you selected Apple", Toast. LENGTH_SHORT );
T. show ();
}
Else if (item. getItemId () = 2 ){
Toast t = Toast. makeText (this, "you selected bananas", Toast. LENGTH_SHORT );
T. show ();
}
Return super. onOptionsItemSelected (item );
}
 
 
Click Apple MenuItem
 
2 SubMenu
SubMenu creation is also simple. Add a few sentences to the onCreateOptionsMenu (Menu menu) method of the first code, as follows:
 
@ Override
Ublic boolean onCreateOptionsMenu (Menu menu ){
// TODO Auto-generated method stub
Menu. add (0, 1, 1, "apple ");
Menu. add (0, 2, 2, "banana ");
SubMenu subMenu = menu. addSubMenu (1,100,100, "Peach ");
SubMenu. add (2,101,101, "Peach ");
SubMenu. add (2,102,102, "Peach ");
Return super. onCreateOptionsMenu (menu );
 
 
After you click "Peach", the sub menu will appear. There are two sub options: "big peach" and "little peach ".





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