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| 一、问题描述 |
在上次博文中，我们使用RadioGroup+ViewPage+Fragmen实现了顶部滑动导航（查看文章：http://www.cnblogs.com/jerehedu/p/4607599.html#dxjmsj ），接下来我们使用FragmentTabHost+Fragment实现底部tab切换，效果如图所示
| 二、案例主要组件 |
把整个Activity分成两部TabHost和TabContent，TabHost包含各个tab，tab之间切换将在TabContent所关联的FrameLayout区域中显示各自板块的内容
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity" > <FrameLayout android:id="@+id/contentLayout" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"> </FrameLayout> <android.support.v4.app.FragmentTabHost android:id="@android:id/tabhost" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#F6F6F6" > <FrameLayout android:id="@android:id/tabcontent" android:layout_height="0dp" android:layout_width="0dp" /> </android.support.v4.app.FragmentTabHost> </LinearLayout>
public class MainActivity extends FragmentActivity implements OnTabChangeListener{ private FragmentTabHost tabHost; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tabHost=(FragmentTabHost)super.findViewById(android.R.id.tabhost); tabHost.setup(this,super.getSupportFragmentManager() ,R.id.contentLayout); tabHost.getTabWidget().setDividerDrawable(null); tabHost.setOnTabChangedListener(this); initTab(); } private void initTab(){ String tabs[]=TabDb.getTabsTxt(); for(int i=0;i<tabs.length;i++){ TabSpec tabSpec=tabHost.newTabSpec(tabs[i]).setIndicator(getTabView(i)); tabHost.addTab(tabSpec,TabDb.getFragments()[i],null); tabHost.setTag(i); } } private View getTabView(int idx){ View view=LayoutInflater.from(this).inflate(R.layout.footer_tabs,null); ((TextView)view.findViewById(R.id.tvTab)).setText(TabDb.getTabsTxt()[idx]); if(idx==0){ ((TextView)view.findViewById(R.id.tvTab)).setTextColor(Color.RED); ((ImageView)view.findViewById(R.id.ivImg)).setImageResource(TabDb.getTabsImgLight()[idx]); }else{ ((ImageView)view.findViewById(R.id.ivImg)).setImageResource(TabDb.getTabsImg()[idx]); } return view; } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public void onTabChanged(String tabId) { // TODO Auto-generated method stub updateTab(); } private void updateTab(){ TabWidget tabw=tabHost.getTabWidget(); for(int i=0;i<tabw.getChildCount();i++){ View view=tabw.getChildAt(i); ImageView iv=(ImageView)view.findViewById(R.id.ivImg); if(i==tabHost.getCurrentTab()){ ((TextView)view.findViewById(R.id.tvTab)).setTextColor(Color.RED); iv.setImageResource(TabDb.getTabsImgLight()[i]); }else{ ((TextView)view.findViewById(R.id.tvTab)).setTextColor(getResources().getColor(R.color.foot_txt_gray)); iv.setImageResource(TabDb.getTabsImg()[i]); } } } }
提供界面设计所需的tab文本、tab图片和Fragment类型数据
public class TabDb { public static String[] getTabsTxt(){ String[] tabs={"新闻","阅读","试听","发现"," 我"}; return tabs; } public static int[] getTabsImg(){ int[] ids={R.drawable.foot_news_normal,R.drawable.foot_read_normal,R.drawable.foot_vdio_normal,R.drawable.foot_fond_normal,R.drawable.foot_out_normal}; return ids; } public static int[] getTabsImgLight(){ int[] ids={R.drawable.foot_news_light,R.drawable.foot_read_light,R.drawable.foot_vdio_light,R.drawable.foot_found_light,R.drawable.foot_out_light}; return ids; } public static Class[] getFragments(){ Class[] clz={NewsFragment.class,ReadFragment.class,VideoFragment.class,FoundFragment.class,OwnerFragment.class}; return clz; } }
共5个Fragment为NewsFragment、ReadFragment、FoundFragment、OwnerFragment、VideoFragment,根据不同板块各自设计界面，这里重点是如何实现底部tab切换，简单布局一下即可，以NewsFragment为例代码如下：
public class NewsFragment extends Fragment { @Override public void onAttach(Activity activity) { // TODO Auto-generated method stub super.onAttach(activity); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub TextView tvTitle=new TextView(super.getActivity()); tvTitle.setText("新闻"); tvTitle.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); tvTitle.setGravity(Gravity.CENTER); tvTitle.setTextSize(30); return tvTitle; } @Override public void setArguments(Bundle args) { // TODO Auto-generated method stub super.setArguments(args); } }
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:padding="5dp" android:background="#F6F6F6" > <ImageView android:id="@+id/ivImg" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" /> <TextView android:id="@+id/tvTab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/ivImg" android:textColor="#AEAEAE" android:text="新闻" android:layout_marginTop="2dp"/>
想要了解更多内容的小伙伴，可以点击查看源码，亲自运行测试。
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Android典型界面设计——FragmentTabHost+Fragment实现底部tab切换
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原文地址：http://www.cnblogs.com/jerehedu/p/4663494.html
