• Android TabHost的使用 .


    1. 最简单的TabHost,Tab来自于layout下的元素 (只从1个Layout中取数据)

    (1)效果图

    (2)代码

    1)tab_demo.xml

    <?xml version="1.0" encoding="utf-8"?>  
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
        android:orientation="vertical"  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        >  
        <TextView android:id="@+id/tab_demo_tv1"  
            android:layout_width="fill_parent"   
            android:layout_height="fill_parent"   
            android:text="tab_demo_tv1"  
        />  
        <TextView android:id="@+id/tab_demo_tv2"  
            android:layout_width="fill_parent"   
            android:layout_height="fill_parent"   
            android:text="tab_demo_tv2"  
        />  
        <TextView android:id="@+id/tab_demo_tv3"  
            android:layout_width="fill_parent"   
            android:layout_height="fill_parent"   
            android:text="tab_demo_tv3"  
        />  
    </FrameLayout> 

    2)TabDemo.java

    public class TabDemo extends TabActivity {  
        private TabHost tabHost;  
          
        public void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            tabHost = getTabHost();  
              
            LayoutInflater.from(this).inflate(R.layout.tab_demo, tabHost.getTabContentView(), true);  
            tabHost.addTab(tabHost.newTabSpec("tab1").setIndicator("Tab1", null).setContent(R.id.tab_demo_tv1)); 
            tabHost.addTab(tabHost.newTabSpec("tab2").setIndicator("Tab2", null).setContent(R.id.tab_demo_tv2)); 
            tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("Tab3", null).setContent(R.id.tab_demo_tv3)); 
              
            setContentView(tabHost);  
        }  
    }  

    2. TabHost绑定动态View(从2个Layout中取数据)

    (1)效果图

    (2)代码

    1)tab_map.xml

    <?xml version="1.0" encoding="utf-8"?>  
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
        android:orientation="vertical"  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        android:id="@+id/tab_map_id"  
        >  
    </FrameLayout> 

    2)tab_hs.xml

    <?xml version="1.0" encoding="utf-8"?>  
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        android:id="@+id/tab_hs_id"  
        >  
        <TextView android:id="@+id/tab_hs_tv"  
            android:layout_width="fill_parent"  
            android:layout_height="fill_parent"  
        />  
    </FrameLayout> 

    3)MapView.java

    public class MapView extends View {  
        public MapView(Context context) {  
            super(context);  
        }  
        protected void onDraw(Canvas canvas) {  
            Paint p = new Paint();  
            canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.icon), 0, 0, p);
        }  
    }  

    4)TabDemo.java

    public class TabDemo extends TabActivity {  
        private TabHost tabHost;  
          
        public void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            tabHost = getTabHost();  
              
            createTabSpec_map();  
            createTabSpec_hs();  
              
            setContentView(tabHost);  
        }  
          
        private void createTabSpec_map() {  
            LayoutInflater inflater_tab1 = LayoutInflater.from(this);  
            inflater_tab1.inflate(R.layout.tab_map, tabHost.getTabContentView());  
              
            /* 
             * R.layout.tab_demo已被LayoutInflater注册,所以这个可以通过findViewById获得其对象 
             */  
            FrameLayout frameLayout = (FrameLayout) findViewById(R.id.tab_map_id);  
            MapView mv = new MapView(this);  
            frameLayout.addView(mv);  
              
            TabHost.TabSpec tabSpec_map = tabHost.newTabSpec("map view");  
            tabSpec_map.setIndicator("map view", null);  
            tabSpec_map.setContent(R.id.tab_map_id); // 动态绑定基于图片的View(通过一个Layout绑定)  
            tabHost.addTab(tabSpec_map);  
        }  
        private void createTabSpec_hs() {  
            LayoutInflater inflater_tab2 = LayoutInflater.from(this);  
            inflater_tab2.inflate(R.layout.tab_hs, tabHost.getTabContentView());  
              
            TabHost.TabSpec tabSpec_hs = tabHost.newTabSpec("hs view");  
            tabSpec_hs.setIndicator("hs view");  
            tabSpec_hs.setContent(R.id.tab_hs_id); // 绑定一个新的Layout  
            tabHost.addTab(tabSpec_hs);  
              
            /* 
             * 这个绑定View的操作必须要重新使用一个新方法来完成,因为Tab的生成是在onCreate()中完成的,onCreate()只被调用一次, 
             * 但是数据更新操作是需要反复进行的,如果反复调用createTabSpec_hs()则会生成多个tab页,这是我们不希望的,所以单独把 
             * updata分离出来,数据更新时单独调用此方法就可以了。 
             */  
            updateTabSpec_hs();  
        }  
        private void updateTabSpec_hs() {  
            TextView tv = (TextView) findViewById(R.id.tab_hs_tv);  
            tv.setText("This is tab2");  
        }  
    }  
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  • 原文地址:https://www.cnblogs.com/vip-ygh/p/3569623.html
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