1. @2011 Mihail L. Sichitiu1 Android Introduction GUI Menu Many thanks to Jun Bum Lim for his help with this tutorial.

2. @2011 Mihail L. Sichitiu2 Goal  Create an application that supports options/sub/context menus Automatically fill “Hi!” in the EditText Plus menu will also open a sub-menu Display messages when a menu clicked

3. @2011 Mihail L. Sichitiu3 Menu Composition Plus Home Pre Next Sub1 Sub2 Hi Hola Hello Long press in EditText

4. @2011 Mihail L. Sichitiu4 Create HelloMenu Project  Create the two TextViews and an EditText  Create “menu” folder in res/  Create menu.xml in res/menu/ (New > Other > Android XML File)  Create context_menu.xml in res/menu/

5. @2011 Mihail L. Sichitiu5 res/menu/menu.xml <menu xmlns:android="http://schemas.android.com/apk/res/android"> Sub-menu items Option menu items  Define Option menu and sub-menu

6. @2011 Mihail L. Sichitiu6 res/menu/context.xml <menu xmlns:android="http://schemas.android.com/apk/res/android">  Define context menu for EditText

7. @2011 Mihail L. Sichitiu7 res/values/strings.xml Click Menu Button ! Android Menu Example Plus Pre Next Home Sub1 Sub2 Hi ! Hola ! Hello !  Define constant strings used in the application

8. @2011 Mihail L. Sichitiu8 icons  Place icons used in menu.xml in res/drawable/ icons  Download icons at: http://www4.ncsu.edu/~mlsichit/UCAB/resources.html

9. @2011 Mihail L. Sichitiu9 Inflating a option menu resource  Inflating a menu resource (menu.xml) by adding onCreateOptionsMenu(Menu menu) in the main Activity.  Menu items in menu.xml will appear when the user touches the MENU button public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu, menu); return true; } public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu, menu); return true; }

10. @2011 Mihail L. Sichitiu10 Response to user action  Response to menu click events by overriding onOptionsItemSelected(Menu menu) in the main Activity. @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menuItemPlus: Toast.makeText(this, "Plus Button Clicked !", Toast.LENGTH_SHORT).show(); Log.i(TAG,"menuItemPlus"); return true; : case R.id.menuItemNext: Toast.makeText(this, "Next Button Clicked !", Toast.LENGTH_SHORT).show(); Log.i(TAG,"menuItemNext"); return true; } return false; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menuItemPlus: Toast.makeText(this, "Plus Button Clicked !", Toast.LENGTH_SHORT).show(); Log.i(TAG,"menuItemPlus"); return true; : case R.id.menuItemNext: Toast.makeText(this, "Next Button Clicked !", Toast.LENGTH_SHORT).show(); Log.i(TAG,"menuItemNext"); return true; } return false; }

11. @2011 Mihail L. Sichitiu11 Register View for a context menu  By calling registerForContextMenu() and passing it a View (an EditText in this example) you assign it a context menu.  When this View (EditText) receives a long-press, it displays a context menu. public class AndroidMenuExampleActivity extends Activity { private EditText mOutEditText; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mOutEditText = (EditText) findViewById(R.id.editText); registerForContextMenu(mOutEditText); } : public class AndroidMenuExampleActivity extends Activity { private EditText mOutEditText; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mOutEditText = (EditText) findViewById(R.id.editText); registerForContextMenu(mOutEditText); } :

12. @2011 Mihail L. Sichitiu12 Define context menu’s appearance  By overriding the activity's context menu create callback method, onCreateContextMenu(). @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.context_menu, menu); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.context_menu, menu); }

13. @2011 Mihail L. Sichitiu13 Define context menu’s behavior  By overriding your activity's menu selection callback method for context menu, onContextItemSelected(). @Override public boolean onContextItemSelected(MenuItem item) { Log.i(TAG,"ContextItem selected"); AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); switch (item.getItemId()) { case R.id.menuItemHi: mOutEditText.setText( this.getResources().getText( R.string.hi_msg) ); return true; case R.id.menuItemHola: : default: return super.onContextItemSelected(item); } @Override public boolean onContextItemSelected(MenuItem item) { Log.i(TAG,"ContextItem selected"); AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); switch (item.getItemId()) { case R.id.menuItemHi: mOutEditText.setText( this.getResources().getText( R.string.hi_msg) ); return true; case R.id.menuItemHola: : default: return super.onContextItemSelected(item); }