Android TabHost如何实现顶部选项卡

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<android.support.constraint.ConstraintLayout xmlns:android=\"http://schemas.android.com/apk/res/android\"
  xmlns:app=\"http://schemas.android.com/apk/res-auto\"
  xmlns:tools=\"http://schemas.android.com/tools\"
  android:layout_width=\"match_parent\"
  android:layout_height=\"match_parent\"
  tools:context=\".MainActivity\">

  <TabHost
    android:id=\"@+id/tabMenu\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"0dp\">

    <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/tab1\"
          android:layout_width=\"match_parent\"
          android:layout_height=\"match_parent\"
          android:orientation=\"vertical\">

        </LinearLayout>

        <LinearLayout
          android:id=\"@+id/tab2\"
          android:layout_width=\"match_parent\"
          android:layout_height=\"match_parent\"
          android:orientation=\"vertical\">

        </LinearLayout>

        <LinearLayout
          android:id=\"@+id/tab3\"
          android:layout_width=\"match_parent\"
          android:layout_height=\"match_parent\"
          android:orientation=\"vertical\">

        </LinearLayout>
      </FrameLayout>
    </LinearLayout>
  </TabHost>

</android.support.constraint.ConstraintLayout>

package action.sun.com.tabhost;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TabHost;

public class MainActivity extends AppCompatActivity {

  private TabHost tabhost;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //得到TabHost对象实例
    tabhost =(TabHost) findViewById(R.id.tabMenu);

    //调用 TabHost.setup()
    tabhost.setup();
    //创建Tab标签
    tabhost.addTab(tabhost.newTabSpec(\"one\").setIndicator(\"红色\").setContent(R.id.tab1));
    tabhost.addTab(tabhost.newTabSpec(\"two\").setIndicator(\"黄色\").setContent(R.id.tab2));
    tabhost.addTab(tabhost.newTabSpec(\"three\").setIndicator(\"黄色\").setContent(R.id.tab3));

    tabhost.setOnTabChangedListener(new TabHost.OnTabChangeListener() {
      @Override
      public void onTabChanged(String s) {
        Log.d(\"xxx\", \"onTabChanged: =\"+s);
        if (s.equals(\"one\")){
          //可是让viewpage的视图显示出来
          //viewPager.setCurrentItem(0);
        }else if (s.equals(\"two\")){
          ////可是让viewpage的视图显示出来
          // viewPager.setCurrentItem(1);
        }
      }
    });
  }
}