Question

我有问题，但我没有找到任何解决方案，所以我正在写。我正在尝试创建一个从波兰股票下载和解析数据的应用程序。我想每隔30秒更新一次公司的价值，我这样做但是我无法刷新当前标签，如果我想看到新值我如何切换标签两次然后再回来，然后我可以看到新值。我想在不切换标签的情况下更新数据。

MainActivity

    pobieranie_wartosci.start();
//this starts Thread for updating data  


    // init tabhost
    this.initializeTabHost(savedInstanceState);

    // init ViewPager
    this.initializeViewPager();

}


private void initializeViewPager() {
    List<Fragment> fragments = new Vector<Fragment>();

    fragments.add(new Tab1Fragment());
    fragments.add(new Tab2Fragment());
    fragments.add(new Tab1Fragment());
    fragments.add(new Tab1Fragment());
    fragments.add(new Tab3Fragment());
    fragments.add(new Tab1Fragment());


    this.myViewPagerAdapter = new MyFragmentPagerAdapter(
            getSupportFragmentManager(), fragments);
    this.viewPager = (ViewPager) super.findViewById(R.id.viewPager);
    this.viewPager.setAdapter(this.myViewPagerAdapter);
    this.viewPager.setOnPageChangeListener(this);

    onRestart();

}

我也在这里放置我更新数据的线程

Thread pobieranie_wartosci = new Thread()
{
    public void run()
    {
        while(true)
        {

            int r = zmienne.lista_moich_spolek.size()-1;
            for(int i =0; i<=r;i++){
                try 
                {
                    zmienne.lista_moich_spolek.get(i).transformacja_ceny(new Cena().execute(zmienne.lista_moich_spolek.get(i).numer).get());
                } catch (InterruptedException e) 
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (ExecutionException e) 
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }



                zmienne.lista_moich_spolek.get(0).cena_kupna++;

                System.out.println("cena :" + zmienne.lista_moich_spolek.get(0).cena_kupna);
            }

        try {
            Thread.sleep(1500);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }   
        }
    }

};

最后可能有用的是MyPageAdapter

public class MyFragmentPagerAdapter extends FragmentPagerAdapter {

List<Fragment> fragments;

public MyFragmentPagerAdapter(FragmentManager fm, List<Fragment> fragments) {
    super(fm);
    this.fragments = fragments;
}

@Override
public Fragment getItem(int position) {
    return this.fragments.get(position);
}

@Override
public int getCount() {

    return fragments.size();
}

}

Android每隔30秒刷新一次ListView片段

0 个答案: