How to use and customize tab(image, font)?

1. Create tabs

TabHost tabHost = getTabHost(); // The activity TabHost
TabHost.TabSpec spec; // Resusable TabSpec for each tab
Intent intent; // Reusable Intent for each tab
// Create an Intent to launch an Activity for the tab (to be reused)
intent = new Intent().setClass(this, TaskActivity.class);
// Initialize a TabSpec for each tab and add it to the TabHost
spec = tabHost.newTabSpec("task").setIndicator("Task", null).setContent(intent);
tabHost.addTab(spec); // Do the same for the other tabs
intent = new Intent().setClass(this, CalendarActivity.class);
spec = tabHost.newTabSpec("calendar").setIndicator("Calendar", null).setContent(intent);
tabHost.addTab(spec); 

2. Customize tabs

TabHost tabHost = getTabHost();
LinearLayout linearLayout = (LinearLayout) tabHost.getChildAt(0); 
TabWidget tw = (TabWidget) linearLayout .getChildAt(0);
RelativeLayoutfirstTabLayout = (RelativeLayout) tw.getChildAt(0); 
//First tab
TextViewtabHeader = (TextView) firstTabLayout .getChildAt(1); 
tabHeader .setTextSize(18); //Change text size
tabHost.getTabWidget().getChildAt(0).getLayoutParams().height = 36; 
//Change first tab header height
firstTabLayout.setBackgroundResource(R.drawable.group_background_overdue);
tabHeader.setText("Tab page 1");