| /* |
| * Copyright (C) 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.supportv4.app; |
| |
| import com.example.android.supportv4.R; |
| |
| import android.content.Context; |
| import android.os.Bundle; |
| import android.support.v4.app.Fragment; |
| import android.support.v4.app.FragmentActivity; |
| import android.support.v4.app.FragmentPagerAdapter; |
| import android.support.v4.view.ViewPager; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.TabHost; |
| import android.widget.TabWidget; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * Demonstrates combining a TabHost with a ViewPager to implement a tab UI |
| * that switches between tabs and also allows the user to perform horizontal |
| * flicks to move between the tabs. |
| */ |
| public class FragmentTabsPager extends FragmentActivity { |
| TabHost mTabHost; |
| ViewPager mViewPager; |
| TabsAdapter mTabsAdapter; |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| setContentView(R.layout.fragment_tabs_pager); |
| mTabHost = (TabHost)findViewById(android.R.id.tabhost); |
| mTabHost.setup(); |
| |
| mViewPager = (ViewPager)findViewById(R.id.pager); |
| |
| mTabsAdapter = new TabsAdapter(this, mTabHost, mViewPager); |
| |
| mTabsAdapter.addTab(mTabHost.newTabSpec("simple").setIndicator("Simple"), |
| FragmentStackSupport.CountingFragment.class, null); |
| mTabsAdapter.addTab(mTabHost.newTabSpec("contacts").setIndicator("Contacts"), |
| LoaderCursorSupport.CursorLoaderListFragment.class, null); |
| mTabsAdapter.addTab(mTabHost.newTabSpec("custom").setIndicator("Custom"), |
| LoaderCustomSupport.AppListFragment.class, null); |
| mTabsAdapter.addTab(mTabHost.newTabSpec("throttle").setIndicator("Throttle"), |
| LoaderThrottleSupport.ThrottledLoaderListFragment.class, null); |
| |
| if (savedInstanceState != null) { |
| mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab")); |
| } |
| } |
| |
| @Override |
| protected void onSaveInstanceState(Bundle outState) { |
| super.onSaveInstanceState(outState); |
| outState.putString("tab", mTabHost.getCurrentTabTag()); |
| } |
| |
| /** |
| * 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 TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener { |
| private final Context mContext; |
| private final TabHost mTabHost; |
| private final ViewPager mViewPager; |
| private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>(); |
| |
| static final class TabInfo { |
| private final String tag; |
| private final Class<?> clss; |
| private final Bundle args; |
| |
| TabInfo(String _tag, Class<?> _class, Bundle _args) { |
| tag = _tag; |
| clss = _class; |
| args = _args; |
| } |
| } |
| |
| static class DummyTabFactory implements TabHost.TabContentFactory { |
| private final Context mContext; |
| |
| public DummyTabFactory(Context context) { |
| mContext = context; |
| } |
| |
| @Override |
| public View createTabContent(String tag) { |
| View v = new View(mContext); |
| v.setMinimumWidth(0); |
| v.setMinimumHeight(0); |
| return v; |
| } |
| } |
| |
| public TabsAdapter(FragmentActivity activity, TabHost tabHost, ViewPager pager) { |
| super(activity.getSupportFragmentManager()); |
| mContext = activity; |
| mTabHost = tabHost; |
| mViewPager = pager; |
| mTabHost.setOnTabChangedListener(this); |
| mViewPager.setAdapter(this); |
| mViewPager.addOnPageChangeListener(this); |
| } |
| |
| public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) { |
| tabSpec.setContent(new DummyTabFactory(mContext)); |
| String tag = tabSpec.getTag(); |
| |
| TabInfo info = new TabInfo(tag, clss, args); |
| mTabs.add(info); |
| mTabHost.addTab(tabSpec); |
| 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 onTabChanged(String tabId) { |
| int position = mTabHost.getCurrentTab(); |
| mViewPager.setCurrentItem(position); |
| } |
| |
| @Override |
| public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { |
| } |
| |
| @Override |
| public void onPageSelected(int position) { |
| // Unfortunately when TabHost changes the current tab, it kindly |
| // also takes care of putting focus on it when not in touch mode. |
| // The jerk. |
| // This hack tries to prevent this from pulling focus out of our |
| // ViewPager. |
| TabWidget widget = mTabHost.getTabWidget(); |
| int oldFocusability = widget.getDescendantFocusability(); |
| widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS); |
| mTabHost.setCurrentTab(position); |
| widget.setDescendantFocusability(oldFocusability); |
| } |
| |
| @Override |
| public void onPageScrollStateChanged(int state) { |
| } |
| } |
| } |