Merge "Add support for FragmentTabHost from the support library"

2 files changed, 59 insertions, 1 deletions

diff --git a/bridge/src/com/android/layoutlib/bridge/android/support/FragmentTabHostUtil.java b/bridge/src/com/android/layoutlib/bridge/android/support/FragmentTabHostUtil.java
new file mode 100644
index 0000000000..730ac1300e
--- /dev/null
+++ b/bridge/src/com/android/layoutlib/bridge/android/support/FragmentTabHostUtil.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.layoutlib.bridge.android.support;
+
+import com.android.ide.common.rendering.api.LayoutLog;
+import com.android.layoutlib.bridge.Bridge;
+import com.android.layoutlib.bridge.util.ReflectionUtils.ReflectionException;
+
+import android.content.Context;
+import android.widget.TabHost;
+
+import static com.android.layoutlib.bridge.util.ReflectionUtils.getCause;
+import static com.android.layoutlib.bridge.util.ReflectionUtils.getMethod;
+import static com.android.layoutlib.bridge.util.ReflectionUtils.invoke;
+
+/**
+ * Utility class for working with android.support.v4.app.FragmentTabHost
+ */
+public class FragmentTabHostUtil {
+
+    public static final String CN_FRAGMENT_TAB_HOST = "android.support.v4.app.FragmentTabHost";
+
+    /**
+     * Calls the setup method for the FragmentTabHost tabHost
+     */
+    public static void setup(TabHost tabHost, Context context) {
+        try {
+            invoke(getMethod(tabHost.getClass(), "setup", Context.class,
+                    Class.forName("android.support.v4.app.FragmentManager", true,
+                            tabHost.getClass().getClassLoader()), int.class), tabHost, context, null,
+                    android.R.id.tabcontent);
+        } catch (ReflectionException | ClassNotFoundException e) {
+            Throwable cause = getCause(e);
+            Bridge.getLog().error(LayoutLog.TAG_BROKEN,
+                    "Error occurred while trying to setup FragmentTabHost.", cause, null);
+        }
+    }
+}
diff --git a/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java b/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java
index a1d614da2a..5adba23b2a 100644
--- a/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java
+++ b/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java
@@ -41,9 +41,11 @@ import com.android.layoutlib.bridge.android.BridgeXmlBlockParser;
 import com.android.layoutlib.bridge.android.RenderParamsFlags;
 import com.android.layoutlib.bridge.android.graphics.NopCanvas;
 import com.android.layoutlib.bridge.android.support.DesignLibUtil;
+import com.android.layoutlib.bridge.android.support.FragmentTabHostUtil;
 import com.android.layoutlib.bridge.android.support.SupportPreferencesUtil;
 import com.android.layoutlib.bridge.impl.binding.FakeAdapter;
 import com.android.layoutlib.bridge.impl.binding.FakeExpandableAdapter;
+import com.android.layoutlib.bridge.util.ReflectionUtils;
 import com.android.resources.ResourceType;
 import com.android.tools.layoutlib.java.System_Delegate;
 import com.android.util.Pair;
@@ -828,7 +830,11 @@ public class RenderSessionImpl extends RenderAction<SessionParams> {
 
         // this must be called before addTab() so that the TabHost searches its TabWidget
         // and FrameLayout.
-        tabHost.setup();
+        if (ReflectionUtils.isInstanceOf(tabHost, FragmentTabHostUtil.CN_FRAGMENT_TAB_HOST)) {
+            FragmentTabHostUtil.setup(tabHost, getContext());
+        } else {
+            tabHost.setup();
+        }
 
         if (count == 0) {
             // Create a dummy child to get a single tab