android - why i can't see the Tab of the tabHost? -


i did same code on googles example - , want see tab can click on them , switch between tabs.

i can't see tabs ..

the code: 

<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"           tools:context=".mainactivity">  <tabhost     android:layout_width="match_parent"     android:layout_height="match_parent"     android:layout_alignparenttop="true"     android:layout_centerhorizontal="true">      <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/action"                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:orientation="vertical"                 android:background="@android:color/black">                  <textview                     android:layout_width="match_parent"                     android:layout_height="match_parent"                     android:text="this tab 1" />               </linearlayout>              <linearlayout                 android:id="@+id/memo"                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:orientation="vertical"                 android:background="@android:color/holo_red_dark">                   <textview                     android:layout_width="match_parent"                     android:layout_height="match_parent"                     android:text="this tab 2" />              </linearlayout>              <linearlayout                 android:id="@+id/settings"                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:orientation="vertical"                 android:background="@android:color/holo_blue_light">                   <textview                     android:layout_width="match_parent"                     android:layout_height="match_parent"                     android:text="this tab 3" />              </linearlayout>         </framelayout>      </linearlayout>  </tabhost>  </linearlayout>

try this.

  1. add tabhost id in xml code

    android:id="@+id/tabhost"

  2. add tabhost initialization information in oncreate() method

    @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_tab_host);      tabhost mtabhost = (tabhost) findviewbyid(r.id.tabhost);     mtabhost.setup();     mtabhost.addtab(mtabhost.newtabspec("action").setindicator("title1", null).setcontent(r.id.action));     mtabhost.addtab(mtabhost.newtabspec("memo").setindicator("title2", null).setcontent(r.id.memo));    mtabhost.addtab(mtabhost.newtabspec("settings").setindicator("title3", null).setcontent(r.id.settings)); }

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