Start Activity inside the TabActivity

To start the Activity inside the Tab Bar with out affect the Tab Bar, To perform multiple action inside a single Tab

 1.MainActivity.java

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

        // create the TabHost that will contain the Tabs
        TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);
        TabHost.TabSpec tab1 = tabHost.newTabSpec("First Tab");
        TabHost.TabSpec tab2 = tabHost.newTabSpec("Second Tab");
        TabHost.TabSpec tab3 = tabHost.newTabSpec("Third tab");

        // Set the Tab name and Activity
        // that will be opened when particular Tab will be selected
        tab1.setIndicator("Tab1");
        tab1.setContent(new Intent(this,Tab1Activity.class));

        tab2.setIndicator("Tab2");
        tab2.setContent(new Intent(this,Tab2Activity.class));

        tab3.setIndicator("Tab3");
        tab3.setContent(new Intent(this, Tab3Activity.class));

        /** Add the tabs  to the TabHost to display. */
        tabHost.addTab(tab1);
        tabHost.addTab(tab2);
        tabHost.addTab(tab3);
    }

Add Tabs in normal way to the TabHost

here

     Tab1Activity.class

     Tab2Activity.class

     Tab3Activity.class   

are extends the ActivityGroup class

Tab1Activity.java

 public class Tab1Activity extends ActivityGroup {

    protected static LocalActivityManager mLocalActivityManager;
    Button launchButton;
    /** Called when the activity is first created. */
    @Override public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_a);
        launchButton = (Button)findViewById(R.id.btn_a1);
        launchButton.setOnClickListener(new View.OnClickListener(){
            public void onClick(View v) {
                Intent activity3Intent = new Intent(v.getContext(), Tab11Activity.class);
                StringBuffer urlString = new StringBuffer();
                replaceContentView("activity3", activity3Intent);
            }
        });
    }

    public void replaceContentView(String id, Intent newIntent) {
        View view = getLocalActivityManager().startActivity(id,newIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)).getDecorView();
        this.setContentView(view);
    }
}

using ActivityManger i have start Tab11Activty inside the Tab1Activity that hole view incorporate inside the TabBar view, using this method we can perform multiple action inside the single TabBar