本文将记录如何一步一步做TabHost的,最终实现效果如下图
下面具体讲解如何一步一步做出来这个效果的!
1:创建工程和类如下图所示
2: 编写ic_tab_artists.xml
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <!-- When selected, use grey --> <item android:drawable="@drawable/ic_tab_artists_grey" android:state_selected="true" /> <!-- When not selected, use white--> <item android:drawable="@drawable/ic_tab_artists_white" /> </selector>作用: 这个选择器适用于当tab在不同之间切换的时候选择不同的图片,可以通过state_selected来设置
3: 编写main.xml
<?xml version="1.0" encoding="utf-8"?> <TabHost xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent"> <RelativeLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="5dp"> <TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" /> <FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="5dp" /> </RelativeLayout> </TabHost>作用:一个TabHost的配置文件 android:layout_alignParentBottom="true" 指明tab的方向(默认在上方,我这个例子实现的是放在下方) 其中 : TabWidget 指明的是tab
FrameLayout 指明的是content
4:为每个tab编写类容
public class AlbumsActivity extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView textview = new TextView(this); textview.setText("This is the Albums tab"); setContentView(textview); } }
作用:显示content的区域,这里只是简单的使用了一个TextView 来进行显示区域里面的数据(其他几个类似)
5: 编写HelloTabWidget
public class HelloTabWidget extends TabActivity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Resources res = getResources(); // Resource object to get Drawables TabHost tabHost = getTabHost(); // The activity TabHost TabHost.TabSpec spec; // Resusable TabSpec for each tab Intent intent; // Reusable Intent for each tab // Create an Intent to launch an Activity for the tab (to be reused) intent = new Intent().setClass(this, ArtistsActivity.class); // Initialize a TabSpec for each tab and add it to the TabHost spec = tabHost.newTabSpec("artists").setIndicator("Artists", res.getDrawable(R.drawable.ic_tab_artists)) .setContent(intent); tabHost.addTab(spec); // Do the same for the other tabs intent = new Intent().setClass(this, AlbumsActivity.class); spec = tabHost.newTabSpec("albums").setIndicator("Albums", res.getDrawable(R.drawable.ic_tab_artists)) .setContent(intent); tabHost.addTab(spec); intent = new Intent().setClass(this, SongsActivity.class); spec = tabHost.newTabSpec("songs").setIndicator("Songs", res.getDrawable(R.drawable.ic_tab_artists)) .setContent(intent); tabHost.addTab(spec); intent = new Intent().setClass(this, newAddActivity.class); // Initialize a TabSpec for each tab and add it to the TabHost spec = tabHost.newTabSpec("add").setIndicator("Add", res.getDrawable(R.drawable.ic_tab_artists)) .setContent(intent); tabHost.addTab(spec); tabHost.setCurrentTab(2); //处理tabId tabHost.setOnTabChangedListener(new OnTabChangeListener() { public void onTabChanged(String tabId) { Log.i("HelloTabWidget", tabId) ; } }); }
作用: 实现了TabActivity 并添加了一个新的newAddActivity ,如果你要实现TabChanged后的逻辑可以实现OnTabChangeListener这个接口
这里具体讲解一下如何实现的过程:
①:TabHost tabHost = getTabHost(); 获得TabHost根标签
②:spec = tabHost.newTabSpec("artists").setIndicator("Artists", res.getDrawable(R.drawable.ic_tab_artists)) .setContent(intent); 实例化一个具体的tab,并设置图标和类容
③:tabHost.addTab(spec); 添加到TabHost 中
④:tabHost.setCurrentTab(2); 默认选择卡
本例的下载源码: http://download.youkuaiyun.com/source/3576083