ViewPagerStyle1Activity.java

public class ViewPagerStyle1Activity extends FragmentActivity {
    private ViewPager _mViewPager;
    private ViewPagerAdapter _adapter;
    private Button _btn1,_btn2;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        setUpView();
        setTab();
    }
    private void setUpView(){
     _mViewPager = (ViewPager) findViewById(R.id.viewPager);
     _adapter = new ViewPagerAdapter(getApplicationContext(),getSupportFragmentManager());
     _mViewPager.setAdapter(_adapter);
     _mViewPager.setCurrentItem(0);
     initButton();
    }
    private void setTab(){
            _mViewPager.setOnPageChangeListener(new OnPageChangeListener(){
 
                        @Override
                        public void onPageScrollStateChanged(int position) {}
                        @Override
                        public void onPageScrolled(int arg0, float arg1, int arg2) {}
                        @Override
                        public void onPageSelected(int position) {
                            // TODO Auto-generated method stub
                            btnAction(position);
                        }
 
                    });
 
    }
    private void btnAction(int action){
        switch(action){
          case 0: setButton(_btn1,"1",40,40); setButton(_btn2,"",20,20);break;
 
          case 1: setButton(_btn2,"2",40,40); setButton(_btn1,"",20,20); break;
        }
    }
    private void initButton(){
        _btn1=(Button)findViewById(R.id.btn1);
        _btn2=(Button)findViewById(R.id.btn2);
        setButton(_btn1,"1",40,40);
        setButton(_btn2,"",20,20);
    }
    private void setButton(Button btn,String text,int h, int w){
        btn.setWidth(w);
        btn.setHeight(h);
        btn.setText(text);
    }
}