cambiare lo sfondo Tab sulla selezione

Question

Ho bisogno di impostare diverse immagini come sfondo scheda su diversi stati. Ho impostato un'immagine come sfondo per impostazione predefinita, ma come passare ad altro, quando è selezionata la scheda. Qui di seguito è il mio codice.

public class HelloTabWidget extends  TabActivity {            

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Resources res = getResources(); // Resource object to get Drawables    
        TabHost tabHost = getTabHost();  // The activity TabHost    
        TabHost.TabSpec spec;  // Resusable TabSpec for each tab    
        Intent intent;  // Reusable Intent for each tab
        TabWidget tw = getTabWidget(); 


        for (int i = 0; i < tw.getChildCount(); i++) { 
                    View v = tw.getChildAt(i); 
                    v.setBackgroundDrawable(getResources().getDrawable 
        (R.drawable.tab_artist)); 
                  } 



        //First tab
        intent = new Intent().setClass(this, FirstActivity.class);    // Initialize a TabSpec for each tab and add it to the TabHost    
        spec = tabHost.newTabSpec("First").setIndicator("First")
        .setContent(intent);    
        tabHost.addTab(spec);
        getTabHost().getTabWidget().getChildAt(0).setBackgroundResource(R.drawable.tabselected);

         //Second tab
         intent = new Intent().setClass(this, SecondActivity.class);    // Initialize a TabSpec for each tab and add it to the TabHost    
            spec = tabHost.newTabSpec("Second").setIndicator("Second")
            .setContent(intent);    
            tabHost.addTab(spec);
             getTabHost().getTabWidget().getChildAt(1).setBackgroundResource(R.drawable.tabselected);

             //third
             intent = new Intent().setClass(this, ThirdActivity.class);    // Initialize a TabSpec for each tab and add it to the TabHost    
                spec = tabHost.newTabSpec("Third").setIndicator("Third")
                .setContent(intent);    
                tabHost.addTab(spec);
                getTabHost().getTabWidget().getChildAt(2).setBackgroundResource(R.drawable.tabselected);

    }
}

/ * tab_artist.xml * /

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">    
<!-- When selected, use grey -->    
<item android:background="@drawable/tabselected"  android:state_selected="true" />    
<!-- When not selected, use white-->    
<item android:background="@drawable/tabunselected" />
</selector>

Answer 1

public class HelloTabWidget extends  TabActivity implements OnTabChangeListener{  
.....

mTabHost. setOnTabChangedListener(this);

@Override
    public void onTabChanged(String tabId) {

              // Here in tabId you will get the name of the Tab from that you can check and set the background 
                // of the requirement tab according to need.
    }
}

Answer 2

Implementare onTabChangeListener() e ci modificare il loro background. Acclamazioni

http://developer.android.com/reference/android/ widget di / TabHost.OnTabChangeListener.html

Modifica: Utilizzare il tabHost per implementare il metodo. È possibile implementato dove vuoi. Diciamo che farlo dopo aver impostato tutti i TabWidgets. La sua buona pratica utilizzare gli ID della scheda come se li hai impostato "In primo luogo", "Secondo" ecc ecc.

 tabHost.setOnTabChangedListener(new OnTabChangeListener(){
          @Override
            public void onTabChanged(String tabId) {
                        if(tabId.equals("First"){
                                //do something
                        }else if(tabId.equals("Second"))
                        {
                            //do something
                        }// etc etc etc


                        }});

Answer 3

questo può aiutare

Tabhost.setOnTabChangedListener(new OnTabChangeListener(){
@Override
        public void onTabChanged(String tabId) {

            for(int i=0;i<tb.getTabWidget().getChildCount();i++)
            {
                   tb.getTabWidget().getChildAt(i).setBackgroundResource(R.drawable.tabunselected); //unselected
            }
            tb.getTabWidget().getChildAt(tb.getCurrentTab()).setBackgroundResource(R.drawable.tabselected); 
}});