How can I dynamically create menu items?

Question

I am creating an Android application and I am trying to create a user management system where users can log in, log out, etc. I want to display the logon menu item if the user is logged out and the 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 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 (ie 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 the MENU_LOGOUT option if the user is logged on.

  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 is all that is needed.

Answer 2

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

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

Answer 3

you can call invalidateOptionsMenu () (note: you must use a compatibility library, such as actionBarSherlock, to access if you need to maintain a low version API), and then update the menu items according to the status.

there you can hide the login action element and show the logout action element.

You can also try updating the icon itself, but I have never tried it.