android:layout_gravity="center"
android:src="@drawable/help"/>

Activity文件 TabDemo.java

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.TabHost;
import android.widget.Toast;
import android.widget.TabHost.OnTabChangeListener;

import com.kf.samples5.R;

public class TabDemo extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.tab);
TabHost host = (TabHost)findViewById(R.id.tabhost);
host.setup();

TabHost.TabSpec homeSpec = host.newTabSpec("Home"); //This

param will be used as tabId.
homeSpec.setIndicator(null, //This param will diplay as title.
getResources().getDrawable(R.drawable.home_normal));
homeSpec.setContent(R.id.tab1);
host.addTab(homeSpec);

TabHost.TabSpec garbageSpec = host.newTabSpec("Garbage");
garbageSpec.setIndicator(null, getResources().getDrawable

(R.drawable.garbage_normal));
garbageSpec.setContent(R.id.tab2);
host.addTab(garbageSpec);

TabHost.TabSpec maybeSpec = host.newTabSpec("Help");
maybeSpec.setIndicator(null, getResources().getDrawable

(R.drawable.help_normal));
maybeSpec.setContent(R.id.tab3);
host.addTab(maybeSpec);

host.setOnTabChangedListener(new OnTabChangeListener() {

@Override
public void onTabChanged(String tabId) {
// TODO Auto-generated method stub
Toast toast = Toast.makeText(TabDemo.this, tabId, Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER_HORIZONTAL, 0, 50);
toast.show();
}
});

// host.setCurrentTabByTag("Home");
Toast toast = Toast.makeText(TabDemo.this, "Home",

Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER_HORIZONTAL, 0, 50);
toast.show();
}
}