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POHow can I refresh the ActionBar when onPrepareOptionsMenu switched menu entries?
 

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  1. POHow can I refresh the ActionBar when onPrepareOptionsMenu switched menu entries?
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    <p>Within my apps I often enable/disable menu entries and do make them visible from onPrepareOptionsMenu.</p> <p>Today I started to add the android:showAsAction menu attribute to some of my Android 2.x apps to show menu entries used most on the ActionBar.</p> <p>The ActionBar does not reflect the enable/disable and visibility immediately. I need to click on the menu dropdown on the right to see this change happen.</p> <p>Ok, I do understand that the menu fires onPrepareOptionsMenu. But what do I need to do to refresh the ActionBar? I think this change needs to be applied from within onOptionsItemSelected but I don't know what I should call.</p> <p>Here's the menu:</p> <pre><code>&lt;item android:icon="@drawable/ic_menu_mapmode" android:id="@+id/men_mapview" android:showAsAction="ifRoom|withText" android:title="@string/txt_mapview" /&gt; &lt;item android:icon="@drawable/ic_menu_mapmode" android:id="@+id/men_satelliteview" android:showAsAction="ifRoom|withText" android:title="@string/txt_satelliteview" /&gt; </code></pre> <p>Here's the onPrepareOptionsMenu:</p> <pre><code>@Override public boolean onPrepareOptionsMenu(final Menu menu) { MenuItem menuItemMapView = menu.findItem(R.id.men_mapview); MenuItem menuItemSatelliteView = menu.findItem(R.id.men_satelliteview); if (mapView.isSatellite()) { menuItemMapView.setEnabled(true).setVisible(true); menuItemmenuItemSatelliteView.setEnabled(false).setVisible(false); } else { menuItemMapView.setEnabled(false).setVisible(false); menuItemmenuItemSatelliteView.setEnabled(true).setVisible(true); } return super.onPrepareOptionsMenu(menu); } </code></pre> <p>Here's the onOptionsItemSelected</p> <pre><code>@Override public boolean onOptionsItemSelected(final MenuItem menuItem) { switch (menuItem.getItemId()) { case R.id.men_mapview: mapView.setSatellite(false); mapView.setStreetView(true); mapView.invalidate(); invalidateOptionsMenu(); // This works on Android 3.x devices only return true; case R.id.men_satelliteview: mapView.setSatellite(true); mapView.setStreetView(false); mapView.invalidate(); invalidateOptionsMenu(); // This works on Android 3.x devices only return true; } return super.onOptionsItemSelected(menuItem); } </code></pre> <p><strong>EDIT:</strong> If I add invalidateOptionsMenu this works on Android 3.x apps but crashes on Android 2.x devices because of a missing method. What's the recommended way to do it right?</p>
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