From 796992a942f3508a15ee62d34d6c7ec5de045d83 Mon Sep 17 00:00:00 2001
From: Tor Norbye <tnorbye@google.com>
Date: Mon, 17 Jan 2011 21:55:18 -0800
Subject: [PATCH] Allow TabHosts to have no children in the tabcontent widget

Replace the code which throws an exception if there are no children in
the FrameLayout that is the tabcontent, with code to add a single
dummy tab.

This makes the TabHost renderable in those scenarios where the real
tabs are added dynamically rather than via XML.

Change-Id: I72442bd7d40eddd875b3507585c1f372fcae3329
---
 .../bridge/impl/RenderSessionImpl.java        | 46 +++++++++++--------
 1 file changed, 28 insertions(+), 18 deletions(-)

diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java
index e5951f6a23f0d..c14647161f0da 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java
@@ -67,8 +67,10 @@ import android.view.View.AttachInfo;
 import android.view.View.MeasureSpec;
 import android.view.ViewGroup.LayoutParams;
 import android.widget.FrameLayout;
+import android.widget.LinearLayout;
 import android.widget.TabHost;
 import android.widget.TabWidget;
+import android.widget.TabHost.TabSpec;
 
 import java.awt.Color;
 import java.awt.Graphics2D;
@@ -918,7 +920,7 @@ public class RenderSessionImpl extends FrameworkResourceIdProvider {
     /**
      * Returns the top screen offset. This depends on whether the current theme defines the user
      * of the title and status bars.
-     * @param resolver The {@link ResourceResolver}
+     * @param resolver The {@link RenderResources}
      * @param metrics The display metrics
      * @return the pixel height offset
      */
@@ -1047,28 +1049,36 @@ public class RenderSessionImpl extends FrameworkResourceIdProvider {
         // now process the content of the framelayout and dynamically create tabs for it.
         final int count = content.getChildCount();
 
-        if (count == 0) {
-            throw new PostInflateException(
-                    "The FrameLayout for the TabHost has no content. Rendering failed.\n");
-        }
-
         // this must be called before addTab() so that the TabHost searches its TabWidget
         // and FrameLayout.
         tabHost.setup();
 
-        // for each child of the framelayout, add a new TabSpec
-        for (int i = 0 ; i < count ; i++) {
-            View child = content.getChildAt(i);
-            String tabSpec = String.format("tab_spec%d", i+1);
-            int id = child.getId();
-            String[] resource = projectCallback.resolveResourceValue(id);
-            String name;
-            if (resource != null) {
-                name = resource[0]; // 0 is resource name, 1 is resource type.
-            } else {
-                name = String.format("Tab %d", i+1); // default name if id is unresolved.
+        if (count == 0) {
+            // Create a dummy child to get a single tab
+            TabSpec spec = tabHost.newTabSpec("tag").setIndicator("Tab Label",
+                    tabHost.getResources().getDrawable(android.R.drawable.ic_menu_info_details))
+                    .setContent(new TabHost.TabContentFactory() {
+                        public View createTabContent(String tag) {
+                            return new LinearLayout(mContext);
+                        }
+                    });
+            tabHost.addTab(spec);
+            return;
+        } else {
+            // for each child of the framelayout, add a new TabSpec
+            for (int i = 0 ; i < count ; i++) {
+                View child = content.getChildAt(i);
+                String tabSpec = String.format("tab_spec%d", i+1);
+                int id = child.getId();
+                String[] resource = projectCallback.resolveResourceValue(id);
+                String name;
+                if (resource != null) {
+                    name = resource[0]; // 0 is resource name, 1 is resource type.
+                } else {
+                    name = String.format("Tab %d", i+1); // default name if id is unresolved.
+                }
+                tabHost.addTab(tabHost.newTabSpec(tabSpec).setIndicator(name).setContent(id));
             }
-            tabHost.addTab(tabHost.newTabSpec(tabSpec).setIndicator(name).setContent(id));
         }
     }