自定义tabhost实现

tabhost在网上随便找一下很多，但是真正全的东西还是不多，这里总结下我的tabhost的实现的全过程。

1、定义tabhost的xml文件

<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" >    <LinearLayout         android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:orientation="vertical" >                 <FrameLayout            android:id="@android:id/tabcontent"            android:layout_width="fill_parent"            android:layout_height="0.0dip"            android:layout_weight="1.0" />                   <TabWidget            android:id="@android:id/tabs"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="0.0"            android:visibility="gone"            android:divider="@drawable/businessopp_line" />                    <RadioGroup            android:id="@+id/tabhost_radio"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_gravity="bottom"            android:gravity="center_vertical"            android:orientation="horizontal" >            <RadioButton                android:id="@+id/radio_button1"                style="@style/tab_style"                android:background="@drawable/style_tabhost_btn1"                android:tag="radio_button0" />            <RadioButton                android:id="@+id/radio_button2"                style="@style/tab_style"                android:background="@drawable/style_tabhost_btn2"                android:tag="radio_button1"/>            <RadioButton                android:id="@+id/radio_button3"                style="@style/tab_style"                android:background="@drawable/style_tabhost_btn3"                android:tag="radio_button2" />            <RadioButton                android:id="@+id/radio_button4"                style="@style/tab_style"                android:background="@drawable/style_tabhost_btn4"                android:tag="radio_button3" />            <RadioButton                android:id="@+id/radio_button5"                style="@style/tab_style"                android:background="@drawable/style_tabhost_btn5"                android:tag="radio_button4" />                    </RadioGroup>            </LinearLayout></TabHost>

特别注意要加几个id： tabhost中的android:id="@android :id/tabhost" FramFrameLayout中的android:id="@android :id/tabcontent" TabWidget中的android:id="@android :id/tabs"一定要添加，否则报错。还有个地方值得注意的，就是FramFrameLayout中的android:layout_weight="1.0"和TabWidget中的android:layout_weight="0.0"用来控制tabhost组件显示在屏幕最下方。

其中style/tab_style

<style name="tab_style">        <item name="android:button">@null</item>          <item name="android:ellipsize">marquee</item>        <item name="android:gravity">center_horizontal</item>          <item name="android:layout_width">wrap_content</item>        <item name="android:layout_height">wrap_content</item>        <item name="android:layout_weight">1.0</item>    </style>

2、写一个继承TabActivity的类,要写在onstart方法里

public class TabHostActivity extends TabActivity {private TabHost tabHost;public static final String TAB_ITEM_1 = "tabItem1";public static final String TAB_ITEM_2 = "tabItem2";public static final String TAB_ITEM_3 = "tabItem3";public static final String TAB_ITEM_4 = "tabItem4";public static final String TAB_ITEM_5 = "tabItem5";private RadioGroup radiogroup;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_tabhost);WelcomeActivity.myActivitiesList.add(this);radiogroup = (RadioGroup) findViewById(R.id.tabhost_radio);radiogroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {public void onCheckedChanged(RadioGroup group, int checkedId) {switch (checkedId) {case R.id.radio_button1:tabHost.setCurrentTabByTag(TAB_ITEM_1);break;case R.id.radio_button2:tabHost.setCurrentTabByTag(TAB_ITEM_2);break;case R.id.radio_button3:tabHost.setCurrentTabByTag(TAB_ITEM_3);break;case R.id.radio_button4:tabHost.setCurrentTabByTag(TAB_ITEM_4);break;case R.id.radio_button5:tabHost.setCurrentTabByTag(TAB_ITEM_5);break;default:break;}}});tabHost = getTabHost();}@Overrideprotected void onStart() {super.onStart();TabSpec tab1b = tabHost.newTabSpec(TAB_ITEM_1);TabSpec tab2b = tabHost.newTabSpec(TAB_ITEM_2);TabSpec tab3b = tabHost.newTabSpec(TAB_ITEM_3);TabSpec tab4b = tabHost.newTabSpec(TAB_ITEM_4);TabSpec tab5b = tabHost.newTabSpec(TAB_ITEM_5);tab1b.setIndicator(TAB_ITEM_1).setContent(new Intent(this, Test.class));tab2b.setIndicator(TAB_ITEM_2).setContent(new Intent(this, Test.class));tab3b.setIndicator(TAB_ITEM_3).setContent(new Intent(this, Test.class));tab4b.setIndicator(TAB_ITEM_4).setContent(new Intent(this, Test.class));tab5b.setIndicator(TAB_ITEM_5).setContent(new Intent(this, Test.class));tabHost.addTab(tab1b);tabHost.addTab(tab2b);tabHost.addTab(tab3b);tabHost.addTab(tab4b);tabHost.addTab(tab5b);}}

完成，一个自定义的tabhost完成

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