Android TabHost详解及事例（选项卡）

Android TabHost的写法基本是固定的，注意：id必须是固定的，是死的，不然异常。

TabHost分三部分：

1.Tabhost android:id=”@android:id/tabhost”
2.TabWidget android:id=”@android:id/tabs”
3.FrameLayout android:id=”@android:id/tabcontent”

好了，思想+代码。

layout代码：

<TabHost  android:id="@android:id/tabhost" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white">
            <LinearLayout  android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">
                <TabWidget  android:id="@android:id/tabs" android:layout_width="match_parent" android:layout_height="wrap_content"/>
                <FrameLayout  android:id="@android:id/tabcontent" android:layout_width="match_parent" android:layout_height="match_parent">
                    <LinearLayout  android:id="@+id/now_update" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/red_hot">
                    </LinearLayout>
                    <LinearLayout  android:id="@+id/today_choose" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/red_hot">
                    </LinearLayout>
                    <LinearLayout  android:id="@+id/good_choose" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/red_hot">
                    </LinearLayout>
                </FrameLayout>
            </LinearLayout>
        </TabHost>

Activity代码：

public class StoryHallActivity extends TabActivity {
    private TabHost tabHost;
    private TabWidget tabWidget;
    private TabHostSettingsClass tabHostSettingsClass；
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_story_hall);
        findView();
        initView();
    }

    private void findView() {
        tabHost= (TabHost) findViewById(android.R.id.tabhost);
        tabWidget= (TabWidget) findViewById(android.R.id.tabs);
    }

    private void initView() {
        TabHostClass tabHostClass=new TabHostClass(tabHost,R.id.now_update,R.id.today_choose,R.id.good_choose,"最新更新","今日推荐","精彩推荐");
        tabHostClass.setTabHost();
        tabHostSettingsClass=new TabHostSettingsClass(StoryHallActivity.this,tabHost,tabWidget);
        tabHostSettingsClass.setChangeTabSetting();
        tabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() {
            @Override
            public void onTabChanged(String s) {
                tabHostSettingsClass.setChangeTabSetting();
            }
        });
    }
}

TabHost添加代码：

public class TabHostClass {
    private TabHost tabHost;
    private String one;
    private String two;
    private String three;
    private int v1;
    private int v2;
    private int v3;
    public TabHostClass(TabHost tabHost,int v1,int v2,int v3,String one,String two ,String three) {
        this.tabHost=tabHost;
        this.one=one;
        this.two=two;
        this.three=three;
        this.v1=v1;
        this.v2=v2;
        this.v3=v3;
    }

    public  void setTabHost(){
        tabHost.setup();
        tabHost.addTab(tabHost.newTabSpec("one").setContent(v1).setIndicator(one));
        tabHost.addTab(tabHost.newTabSpec("two").setContent(v2).setIndicator(two));
        tabHost.addTab(tabHost.newTabSpec("three").setContent(v3).setIndicator(three));
    }
}

注意：封装TabHost类

设置选中不选中时的字体颜色和背景代码：

public class TabHostSettingsClass {
    private TabHost tabHost;
    private TabWidget tabWidget;
    private Context context;
    public TabHostSettingsClass(Context context,TabHost tabHost,TabWidget tabWidget) {
        this.context=context;
        this.tabHost=tabHost;
        this.tabWidget=tabWidget;
    }
    public void setChangeTabSetting(){
        for (int i = 0; i < tabWidget.getChildCount(); i++) {
            TextView tView = (TextView) tabWidget.getChildAt(i).findViewById(
                    android.R.id.title);
            //修改背景
            tabWidget.getChildAt(i).setBackgroundResource(
                    R.drawable.tabhost_bg);
            tView.setTextSize(16);
            //字体
            tView.setTypeface(Typeface.DEFAULT);
            if (tabHost.getCurrentTab() == i) {
                tView.setTextColor(context.getResources().getColorStateList(
                        android.R.color.holo_red_light));
            } else {
                tView.setTextColor(context.getResources().getColorStateList(
                        android.R.color.darker_gray));
            }
        }
    }
}

注意：上面的是封装的选中不选中的字体和背景的方法

background（背景）代码：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- Non focused states -->
    <item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@android:color/white" />
    <item android:state_focused="false" android:state_selected="true" android:state_pressed="false" android:drawable="@android:color/white" />

    <!-- Focused states -->
    <item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@android:color/white" />
    <item android:state_focused="true" android:state_selected="true" android:state_pressed="false" android:drawable="@android:color/white" />

    <!-- Pressed -->
    <!-- Non focused states -->
    <item android:state_focused="false" android:state_selected="false" android:state_pressed="true" android:drawable="@android:color/white" />
    <item android:state_focused="false" android:state_selected="true" android:state_pressed="true" android:drawable="@android:color/white" />

    <!-- Focused states -->
    <item android:state_focused="true" android:state_selected="false" android:state_pressed="true" android:drawable="@android:color/white" />
    <item android:state_focused="true" android:state_selected="true" android:state_pressed="true" android:drawable="@android:color/white" />
</selector>

注意：自己修改即可

关于在TabHost下面的页面，可在layout中的3个LinearLayout下添加。

方法1.直接写（不建议，太多乱）

方法2.include引用进来（独立）