Add Tab to TabHost

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <TabHost android:id="@+id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TabWidget android:id="@android:id/tabs"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
    />
    <FrameLayout android:id="@android:id/tabcontent"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:paddingTop="62px">
      <Button android:id="@+id/buttontab"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="A semi-random button"
      />
    </FrameLayout>
  </TabHost>
</LinearLayout>

/***//  www  .j  ava2 s  .c om
  Copyright (c) 2008-2009 CommonsWare, LLC
  
  Licensed under the Apache License, Version 2.0 (the "License"); you may
  not use this file except in compliance with the License. You may obtain
  a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/


package com.java2s.myapplication3.app;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AnalogClock;
import android.widget.Button;
import android.widget.TabHost;

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.activity_main);

        final TabHost tabs=(TabHost)findViewById(R.id.tabhost);

        tabs.setup();

        TabHost.TabSpec spec=tabs.newTabSpec("buttontab");
        spec.setContent(R.id.buttontab);
        spec.setIndicator("Button");
        tabs.addTab(spec);

        tabs.setCurrentTab(0);

        Button btn=(Button)tabs.getCurrentView().findViewById(R.id.buttontab);

        btn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                TabHost.TabSpec spec=tabs.newTabSpec("tag1");

                spec.setContent(new TabHost.TabContentFactory() {
                    public View createTabContent(String tag) {
                        return(new AnalogClock(MainActivity.this));
                    }
                });
                spec.setIndicator("Clock");
                tabs.addTab(spec);
            }
        });
    }
}