how to call an Activity through TabBars

I'm making an application in which m using Tab Bars. Now what i need to know is, how to open other Tab through setOn开发者_StackOverflow中文版TabChangedListener() in my code

for example. i am currently in tab and when i click on the 2nd tab it should call the activity of 2nd tab.

see the below code

 TabHost tabHost = getTabHost(); // The activity TabHost
        TabHost.TabSpec spec; // Reusable TabSpec for each tab
        Intent intent; // Reusable Intent for each tab

        // Create an Intent to launch an Activity for the Movies tab.
        intent = new Intent().setClass(this, BarActivity.class);
        // Initialise a TabSpec for the Movies tab and add it to the TabHost.
        spec = tabHost.newTabSpec("Nights").setIndicator("Nights").setContent(intent);
        tabHost.addTab(spec);

        // Do the same things for the Theatres tab.
        intent = new Intent().setClass(this, BarActivity.class);
        spec = tabHost.newTabSpec("Weeks").setIndicator("Weeks").setContent(intent);
        tabHost.addTab(spec);