How can I dynamically create menu items?

Question

I'm building an Android application and I'm trying to build a user management system where users can login, logout, etc. I want to display a login menu item if the user is logged out and a logout button if the user is logged in. How can I do this dynamically?

This is the layout file right now:

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android">   <item android:id="@+id/add" android:title="Add" android:icon="@drawable/ic_menu_add"/>   <item android:id="@+id/list" android:title="List" android:icon="@drawable/ic_menu_list"/>   <item android:id="@+id/refresh" android:title="Refresh" android:icon="@drawable/ic_menu_refresh"/>   <item android:id="@+id/login" android:title="Login" android:icon="@drawable/ic_menu_login"/> </menu> 

This is my Java right now:

@Override public boolean onCreateOptionsMenu(Menu menu) {     new MenuInflater(this).inflate(R.menu.activity_main, menu);     return(super.onCreateOptionsMenu(menu)); }  @Override public boolean onOptionsItemSelected(MenuItem item)  {     System.out.println(item.getItemId()==R.id.add);     if (item.getItemId()==R.id.add)     {         //Cannot add spot unless we have obtained the users current location.          if((currentLat != 0) && (currentLng != 0))         {              System.out.println("loggedin? : "  + auth.isLoggedIn());             if(!auth.isLoggedIn())             {                 Toast.makeText(MainActivity.this, "You must be logged in to add a new spot",                         Toast.LENGTH_LONG).show();             }             else             {                   Intent addIntent = new Intent(MainActivity.this, AddSpot.class);                 Bundle b = new Bundle();                 b.putDouble("currentLat", currentLat);                 b.putDouble("currentLng", currentLng);                 addIntent.putExtras(b);                 startActivity(addIntent);                 return(true);             }         }     }        else if(item.getItemId()==R.id.list)     {         //Pointless showing them a blank screen if nothing is retrieved from the server         if(list != null)         {             Intent listIntent = new Intent(MainActivity.this, ListLocations.class);             listIntent.putExtra("list", list);             startActivity(listIntent);             return(true);         }     }      if(item.getItemId()==R.id.refresh)     {         finish();         startActivity(getIntent());         return(true);            }      if(item.getItemId()==R.id.login)     {         Intent loginIntent = new Intent(MainActivity.this, LoginActivity.class);         startActivity(loginIntent);         return(true);        }      return(super.onOptionsItemSelected(item)); } 

Answer 1

How to Dynamically Add Menu Items to an Android Activity

public class yourActivity extends Activity {     ...     private static final int MENU_ADD = Menu.FIRST;     private static final int MENU_LIST = MENU.FIRST + 1;     private static final int MENU_REFRESH = MENU.FIRST + 2;     private static final int MENU_LOGIN = MENU.FIRST + 3;      /**      * Use if your menu is static (i.e. unchanging)      */     /*     @Override     public boolean onCreateOptionsMenu(Menu menu) {         super.onCreateOptionsMenu(menu);         menu.add(0, MENU_ADD, Menu.NONE, R.string.your-add-text).setIcon(R.drawable.your-add-icon);         menu.add(0, MENU_LIST, Menu.NONE, R.string.your-list-text).setIcon(R.drawable.your-list-icon);         menu.add(0, MENU_REFRESH, Menu.NONE, R.string.your-refresh-text).setIcon(R.drawable.your-refresh-icon);         menu.add(0, MENU_LOGIN, Menu.NONE, R.string.your-login-text).setIcon(R.drawable.your-login-icon);         return true;     }     */      /**      * Gets called every time the user presses the menu button.      * Use if your menu is dynamic.      */     @Override     public boolean onPrepareOptionsMenu(Menu menu) {         menu.clear();         if(enableAdd)             menu.add(0, MENU_ADD, Menu.NONE, R.string.your-add-text).setIcon(R.drawable.your-add-icon);         if(enableList)             menu.add(0, MENU_LIST, Menu.NONE, R.string.your-list-text).setIcon(R.drawable.your-list-icon);         if(enableRefresh)             menu.add(0, MENU_REFRESH, Menu.NONE, R.string.your-refresh-text).setIcon(R.drawable.your-refresh-icon);         if(enableLogin)             menu.add(0, MENU_LOGIN, Menu.NONE, R.string.your-login-text).setIcon(R.drawable.your-login-icon);         return super.onPrepareOptionsMenu(menu);     }      @Override     public boolean onOptionsItemSelected(MenuItem item) {         super.onOptionsItemSelected(item);          switch (item.getItemId()) {         case MENU_ADD: doAddStuff(); break;         case MENU_LIST: doListStuff(); break;         case MENU_REFRESH: doRefreshStuff(); break;         case MENU_LOGIN: doLoginStuff(); break;         }         return false;     } 

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The following specific example adds a MENU_LOGOUT option if the user is logged in.

    private static final int MENU_LOGOUT = MENU.FIRST + 4;      public boolean onPrepareOptionsMenu(Menu menu) {         ...         if(auth.isLoggedIn()) {             menu.add(0, MENU_LOGOUT, Menu.NONE, R.string.your-logout-text).setIcon(R.drawable.your-logout-icon);         }         ...     }      public boolean onOptionsItemSelected(MenuItem item) {         ...         case MENU_LOGOUT:             if(auth.isLoggedIn()) {                 doLogout();             } else {                 Toast.makeText(this, "You must have somehow been logged out between the time the menu button was pressed and now.", Toast.DURATION_LONG).show();             }             break;         ...     } 

That's all there is to it.

Answer 2

In my case the menu items are in the ArrayList , - try this Hope it will help u :)

public void onClick(View v) {     PopupMenu menu = new PopupMenu(DialogCheckBox.this, v);     for (String s : limits) { // "limits" its an arraylist           menu.getMenu().add(s);     }     menu.show(); }