remove a delegate's alerts when it stops

Fixing a crash when a game offers both to create a rematch and to delete
itself because its opponent has been deleted. Deleting and then hitting
rematch would crash because the rematch alert referred to a dead
game. Now onStop() for delegates removes any pending alerts. In
dual-pane mode only since when there's an activity going away the alerts
go automatically.

xwords4/android/XWords4/src/org/eehouse/android/xw4/DelegateBase.java

@@ -92,7 +92,6 @@ public class DelegateBase implements DlgClickNotify,
     protected void onCreateContextMenu( ContextMenu menu, View view,
                                         ContextMenuInfo menuInfo ) {}
     protected boolean onContextItemSelected( MenuItem item ) { return false; }
-    protected void onStop() {}
     protected void onDestroy() {}
     protected void onWindowFocusChanged( boolean hasFocus ) {}
     protected boolean handleBackPressed() { return false; }
@@ -142,6 +141,15 @@ public class DelegateBase implements DlgClickNotify,
         XWService.setListener( null );
     }
 
+    protected void onStop()
+    {
+        // Alerts disappear on their own if not in dualpane mode
+        if ( m_activity instanceof MainActivity
+             && ((MainActivity)m_activity).inDPMode() ) {
+            DlgDelegate.closeAlerts( m_activity, this );
+        }
+    }
+
     protected DelegateBase curThis()
     {
         DelegateBase result = null;

xwords4/android/XWords4/src/org/eehouse/android/xw4/DictsDelegate.java

@@ -552,9 +552,11 @@ public class DictsDelegate extends ListDelegateBase
         setTitleBar();
     }
 
+    @Override
     protected void onStop()
     {
         MountEventReceiver.unregister( this );
+        super.onStop();
     }
 
     public void onClick( View view )

xwords4/android/XWords4/src/org/eehouse/android/xw4/DlgDelegate.java

@@ -938,6 +938,24 @@ public class DlgDelegate {
         }
     }
 
+    protected static void closeAlerts( Activity activity, DelegateBase base )
+    {
+        DbgUtils.assertOnUIThread();
+        Iterator<DlgID> iter = s_pendings.keySet().iterator();
+        while ( iter.hasNext() ) {
+            DlgID dlgID = iter.next();
+            DelegateBase oneBase = s_pendings.get( dlgID ).get();
+            if ( null == oneBase ) {
+                iter.remove();  // no point in keeping it
+            } else if ( base.equals( oneBase ) ) {
+                DbgUtils.logdf( "removing alert %s for %s", dlgID.toString(),
+                                oneBase.toString() );
+                activity.removeDialog( dlgID.ordinal() );
+                iter.remove();  // no point in keeping this either
+            }
+        }
+    }
+
     private String getString( int id, Object... params )
     {
         return m_dlgt.getString( id, params );

xwords4/android/XWords4/src/org/eehouse/android/xw4/GamesListDelegate.java

@@ -1004,6 +1004,7 @@ public class GamesListDelegate extends ListDelegateBase
         return true;            // handled it
     }
 
+    @Override
     protected void onStop()
     {
         // TelephonyManager mgr =
@@ -1012,7 +1013,7 @@ public class GamesListDelegate extends ListDelegateBase
         // m_phoneStateListener = null;
         long[] positions = m_adapter.getGroupPositions();
         XWPrefs.setGroupPositions( m_activity, positions );
-        // super.onStop();
+        super.onStop();
     }
 
     protected void onDestroy()