When switching tabs in Android, what does it constitute?

Question

I have three tabs and each one is its own activity. When I switch tabs I want my Spinner to update but I don't know what method gets called on tab switch. Any help?

Answer 1

Hook up a listener to the TabHost.OnTabChangeListener. You main activity extends TabActivity and its onCreate method probably looks something like this:

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    TabHost tabHost = getTabHost();

    LayoutInflater.from(this).inflate(R.layout.tabs1, tabHost.getTabContentView(), true);

    tabHost.addTab(tabHost.newTabSpec("tab1")
            .setIndicator("tab1")
            .setContent(R.id.view1));
    tabHost.addTab(tabHost.newTabSpec("tab3")
            .setIndicator("tab2")
            .setContent(R.id.view2));
    tabHost.addTab(tabHost.newTabSpec("tab3")
            .setIndicator("tab3")
            .setContent(R.id.view3));
}

To hook up the listener, add the following code in your onCreate() method:

    tabHostt.setOnTabChangedListener(new OnTabChangeListener(){
    @Override
    public void onTabChanged(String tabId) {
        if(tabId.equals("tab1")) {
            //tab1
        }
        else if(tabId.equals("tab2")) {
            //tab2
        }
        else if(tabId.equals("tab3")) {
            //tab3
        }
    }
});

HTH

Answer 2

Something like this should work:

tabHost.setOnTabChangedListener(new OnTabChangeListener()
    {
        public void onTabChanged(String tabId)
        {
            //Do stuff in here
        }
    });