From eda1e89e3e96ada13eee71f9d4905fbca7ce3811 Mon Sep 17 00:00:00 2001
From: Eric House <xwords@eehouse.org>
Date: Mon, 4 Jan 2016 20:40:47 -0800
Subject: [PATCH] replace empty-list-explanation functionality that went away
 when I stopped inheriting from ListActivity.

---
 .../eehouse/android/xw4/InviteDelegate.java   | 35 ++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/xwords4/android/XWords4/src/org/eehouse/android/xw4/InviteDelegate.java b/xwords4/android/XWords4/src/org/eehouse/android/xw4/InviteDelegate.java
index 251118d3c..284df01c7 100644
--- a/xwords4/android/XWords4/src/org/eehouse/android/xw4/InviteDelegate.java
+++ b/xwords4/android/XWords4/src/org/eehouse/android/xw4/InviteDelegate.java
@@ -27,12 +27,15 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
+import android.widget.ListView;
 import android.widget.TextView;
+import android.view.ViewGroup;
 
 import junit.framework.Assert;
 
 abstract class InviteDelegate extends ListDelegateBase
-    implements View.OnClickListener {
+    implements View.OnClickListener,
+               ViewGroup.OnHierarchyChangeListener {
 
     public static final String DEVS = "DEVS";
     public static final String COUNTS = "COUNTS";
@@ -43,6 +46,8 @@ abstract class InviteDelegate extends ListDelegateBase
     protected Button m_rescanButton;
     protected Button m_clearButton;
     private Activity m_activity;
+    private ListView m_lv;
+    private View m_ev;
 
     public InviteDelegate( Delegator delegator, Bundle savedInstanceState,
                            int layoutID )
@@ -66,9 +71,19 @@ abstract class InviteDelegate extends ListDelegateBase
         TextView descView = (TextView)findViewById( desc_id );
         descView.setText( descTxt );
 
+        m_lv = (ListView)findViewById( android.R.id.list );
+        m_ev = findViewById( android.R.id.empty );
+        if ( null != m_lv && null != m_ev ) {
+            m_lv.setOnHierarchyChangeListener( this );
+            showEmptyIfEmpty();
+        }
+
         tryEnable();
     }
 
+    ////////////////////////////////////////
+    // View.OnClickListener
+    ////////////////////////////////////////
     public void onClick( View view ) 
     {
         if ( m_okButton == view ) {
@@ -87,6 +102,24 @@ abstract class InviteDelegate extends ListDelegateBase
         }
     }
 
+    ////////////////////////////////////////
+    // ViewGroup.OnHierarchyChangeListener
+    ////////////////////////////////////////
+    public void onChildViewAdded( View parent, View child )
+    {
+        showEmptyIfEmpty();
+    }
+    public void onChildViewRemoved( View parent, View child )
+    {
+        showEmptyIfEmpty();
+    }
+
+    private void showEmptyIfEmpty()
+    {
+        m_ev.setVisibility( 0 == m_lv.getChildCount()
+                            ? View.VISIBLE : View.GONE );
+    }
+
     abstract void tryEnable() ;
     abstract void listSelected( String[][] devsP, int[][] countsP );
     abstract void scan();