Add ActionBarCompat sample (CL 1 of 2)

Change-Id: Ie41aee3fc805bf73ef0cd673049fcb608b59275c

samples/ActionBarCompat/src/com/example/android/actionbarcompat/ActionBarHelperHoneycomb.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2011 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.example.android.actionbarcompat;
+
+import android.app.Activity;
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+
+/**
+ * An extension of {@link ActionBarHelper} that provides Android 3.0-specific functionality for
+ * Honeycomb tablets. It thus requires API level 11.
+ */
+public class ActionBarHelperHoneycomb extends ActionBarHelper {
+    private Menu mOptionsMenu;
+    private View mRefreshIndeterminateProgressView = null;
+
+    protected ActionBarHelperHoneycomb(Activity activity) {
+        super(activity);
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        mOptionsMenu = menu;
+        return super.onCreateOptionsMenu(menu);
+    }
+
+    @Override
+    public void setRefreshActionItemState(boolean refreshing) {
+        // On Honeycomb, we can set the state of the refresh button by giving it a custom
+        // action view.
+        if (mOptionsMenu == null) {
+            return;
+        }
+
+        final MenuItem refreshItem = mOptionsMenu.findItem(R.id.menu_refresh);
+        if (refreshItem != null) {
+            if (refreshing) {
+                if (mRefreshIndeterminateProgressView == null) {
+                    LayoutInflater inflater = (LayoutInflater)
+                            getActionBarThemedContext().getSystemService(
+                                    Context.LAYOUT_INFLATER_SERVICE);
+                    mRefreshIndeterminateProgressView = inflater.inflate(
+                            R.layout.actionbar_indeterminate_progress, null);
+                }
+
+                refreshItem.setActionView(mRefreshIndeterminateProgressView);
+            } else {
+                refreshItem.setActionView(null);
+            }
+        }
+    }
+
+    /**
+     * Returns a {@link Context} suitable for inflating layouts for the action bar. The
+     * implementation for this method in {@link ActionBarHelperICS} asks the action bar for a
+     * themed context.
+     */
+    protected Context getActionBarThemedContext() {
+        return mActivity;
+    }
+}