[Android] TabActivity

1. Documents
   
   • Reference
     http://developer.android.com/reference/android/app/TabActivity.html
     http://developer.android.com/reference/android/widget/TabHost.html
     
   • Samples
     
     • http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/Tabs1.html
     • http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/Tabs2.html
     • http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/Tabs3.html
   • xxx
     
2. TabHost
   
   • Get handle by invoking the method getTabHost() in subclass of TabActivity
   • Crate new tab by invoking TabHost.newTabSpec
   • Set string/image on tab bar by invoking TabHost.TabSpec.setIndicator (you can also customize tab bar)
   • Set contents in each tab by invoking TabHost.TabSpec.setContent
     In general, we use the following 3 methods to define the layout of each tab
     
     • Define layout of all tabs in one xml file
       (Plese refer to http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/Tabs1.html)
       
     • Define layout of each tab in ont xml file
       (Plese refer to http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/Tabs3.html)
       
     • Create layout of each tab in callback function
       (Plese refer to http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/Tabs2.html)
       
   • xxx
     
3. Change Text Color on Tab Indicator
1. 1st Way
   TextView v;
   int i;
   TabWidget tw = (getTabHost().getTabWidget();
   for (i = 0; i < tw.getChildCount();i++)
   {
       v = (TextView).getChildAt(i).findViewById(android.R.id.title));
       v.setTextColor(Color.WHITE);
   }
2. 2nd Way
• Create a new XML file in res/drawable/ named tab_indicator.xml with the following contents:
  
  
     
                android:state_selected="true" />
     
     
  
• Add table contents as following:
  spec = tabHost.newTabSpec("artists").setIndicator("Artists",
                        getResources().getDrawable(R.drawable.tab_indicator))
                    .setContent(intent);
   tabHost.addTab(spec);
  
• xxx
  
3. xxx
   
4. Samples:
• http://developer.android.com/resources/tutorials/views/hello-tabwidget.html
  
5. xxx