Add ActionBarTabs demo

Change-Id: I21087d63f78a4d35b249e7ffd92bf6823cf29b60

samples/ApiDemos/src/com/example/android/apis/app/ActionBarTabs.java

@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2010 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.apis.app;
+
+import com.example.android.apis.R;
+
+import android.app.ActionBar;
+import android.app.ActionBar.Tab;
+import android.app.Activity;
+import android.app.Fragment;
+import android.app.FragmentTransaction;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+import android.widget.Toast;
+
+/**
+ * This demonstrates the use of action bar tabs and how they interact
+ * with other action bar features.
+ */
+public class ActionBarTabs extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        setContentView(R.layout.action_bar_tabs);
+    }
+
+    public void onAddTab(View v) {
+        final ActionBar bar = getActionBar();
+        final int tabCount = bar.getTabCount();
+        final String text = "Tab " + tabCount;
+        bar.addTab(bar.newTab()
+                .setText(text)
+                .setTabListener(new TabListener(new TabContentFragment(text))));
+    }
+
+    public void onRemoveTab(View v) {
+        final ActionBar bar = getActionBar();
+        bar.removeTabAt(bar.getTabCount() - 1);
+    }
+
+    public void onToggleTabs(View v) {
+        final ActionBar bar = getActionBar();
+
+        if (bar.getNavigationMode() == ActionBar.NAVIGATION_MODE_TABS) {
+            bar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
+            bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_TITLE, ActionBar.DISPLAY_SHOW_TITLE);
+        } else {
+            bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
+            bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
+        }
+    }
+
+    public void onRemoveAllTabs(View v) {
+        getActionBar().removeAllTabs();
+    }
+
+    /**
+     * A TabListener receives event callbacks from the action bar as tabs
+     * are deselected, selected, and reselected. A FragmentTransaction
+     * is provided to each of these callbacks; if any operations are added
+     * to it, it will be committed at the end of the full tab switch operation.
+     * This lets tab switches be atomic without the app needing to track
+     * the interactions between different tabs.
+     */
+    private class TabListener implements ActionBar.TabListener {
+        private TabContentFragment mFragment;
+
+        public TabListener(TabContentFragment fragment) {
+            mFragment = fragment;
+        }
+
+        @Override
+        public void onTabSelected(Tab tab, FragmentTransaction ft) {
+            ft.add(R.id.fragment_content, mFragment, mFragment.getText());
+        }
+
+        @Override
+        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
+            ft.remove(mFragment);
+        }
+
+        @Override
+        public void onTabReselected(Tab tab, FragmentTransaction ft) {
+            Toast.makeText(ActionBarTabs.this, "Reselected!", Toast.LENGTH_SHORT).show();
+        }
+
+    }
+
+    private class TabContentFragment extends Fragment {
+        private String mText;
+
+        public TabContentFragment(String text) {
+            mText = text;
+        }
+
+        public String getText() {
+            return mText;
+        }
+
+        @Override
+        public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                Bundle savedInstanceState) {
+            View fragView = inflater.inflate(R.layout.action_bar_tab_content, container, false);
+
+            TextView text = (TextView) fragView.findViewById(R.id.text);
+            text.setText(mText);
+
+            return fragView;
+        }
+
+    }
+}