| /* |
| * Copyright (C) 2012 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.supportv13.app; |
| |
| import java.util.ArrayList; |
| |
| import com.example.android.supportv13.R; |
| |
| import android.app.ActionBar; |
| import android.app.ActionBar.Tab; |
| import android.app.Activity; |
| import android.app.Fragment; |
| import android.app.FragmentTransaction; |
| import android.content.Context; |
| import android.os.Bundle; |
| import android.support.v13.app.FragmentPagerAdapter; |
| import android.support.v4.view.ViewPager; |
| |
| //BEGIN_INCLUDE(complete) |
| public class FragmentNestingPagerSupport extends Activity { |
| ViewPager mViewPager; |
| TabsAdapter mTabsAdapter; |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| mViewPager = new ViewPager(this); |
| mViewPager.setId(R.id.pager); |
| setContentView(mViewPager); |
| |
| final ActionBar bar = getActionBar(); |
| bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); |
| bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE); |
| |
| mTabsAdapter = new TabsAdapter(this, mViewPager); |
| mTabsAdapter.addTab(bar.newTab().setText("Simple"), |
| CountingFragment.class, null); |
| mTabsAdapter.addTab(bar.newTab().setText("List"), |
| FragmentPagerSupport.ArrayListFragment.class, null); |
| mTabsAdapter.addTab(bar.newTab().setText("Cursor"), |
| CursorFragment.class, null); |
| mTabsAdapter.addTab(bar.newTab().setText("Tabs"), |
| FragmentTabsFragment.class, null); |
| |
| if (savedInstanceState != null) { |
| bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0)); |
| } |
| } |
| |
| @Override |
| protected void onSaveInstanceState(Bundle outState) { |
| super.onSaveInstanceState(outState); |
| outState.putInt("tab", getActionBar().getSelectedNavigationIndex()); |
| } |
| |
| /** |
| * This is a helper class that implements the management of tabs and all |
| * details of connecting a ViewPager with associated TabHost. It relies on a |
| * trick. Normally a tab host has a simple API for supplying a View or |
| * Intent that each tab will show. This is not sufficient for switching |
| * between pages. So instead we make the content part of the tab host |
| * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy |
| * view to show as the tab content. It listens to changes in tabs, and takes |
| * care of switch to the correct paged in the ViewPager whenever the selected |
| * tab changes. |
| */ |
| public static class TabsAdapter extends FragmentPagerAdapter |
| implements ActionBar.TabListener, ViewPager.OnPageChangeListener { |
| private final Context mContext; |
| private final ActionBar mActionBar; |
| private final ViewPager mViewPager; |
| private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>(); |
| |
| static final class TabInfo { |
| private final Class<?> clss; |
| private final Bundle args; |
| |
| TabInfo(Class<?> _class, Bundle _args) { |
| clss = _class; |
| args = _args; |
| } |
| } |
| |
| public TabsAdapter(Activity activity, ViewPager pager) { |
| super(activity.getFragmentManager()); |
| mContext = activity; |
| mActionBar = activity.getActionBar(); |
| mViewPager = pager; |
| mViewPager.setAdapter(this); |
| mViewPager.setOnPageChangeListener(this); |
| } |
| |
| public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) { |
| TabInfo info = new TabInfo(clss, args); |
| tab.setTag(info); |
| tab.setTabListener(this); |
| mTabs.add(info); |
| mActionBar.addTab(tab); |
| notifyDataSetChanged(); |
| } |
| |
| @Override |
| public int getCount() { |
| return mTabs.size(); |
| } |
| |
| @Override |
| public Fragment getItem(int position) { |
| TabInfo info = mTabs.get(position); |
| return Fragment.instantiate(mContext, info.clss.getName(), info.args); |
| } |
| |
| @Override |
| public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { |
| } |
| |
| @Override |
| public void onPageSelected(int position) { |
| mActionBar.setSelectedNavigationItem(position); |
| } |
| |
| @Override |
| public void onPageScrollStateChanged(int state) { |
| } |
| |
| @Override |
| public void onTabSelected(Tab tab, FragmentTransaction ft) { |
| Object tag = tab.getTag(); |
| for (int i=0; i<mTabs.size(); i++) { |
| if (mTabs.get(i) == tag) { |
| mViewPager.setCurrentItem(i); |
| } |
| } |
| } |
| |
| @Override |
| public void onTabUnselected(Tab tab, FragmentTransaction ft) { |
| } |
| |
| @Override |
| public void onTabReselected(Tab tab, FragmentTransaction ft) { |
| } |
| } |
| } |
| //END_INCLUDE(complete) |