如何在视图寻呼机中更改选项卡时更新列表

Question

在我的应用程序中,我使用视图寻呼机的导航选项卡.我能够使用发布在上面的代码成功绘制标签:

https://github.com/codepath/android_guides/wiki/Sliding-Tabs-with-PagerSlidingTabStrip

在这里,我使用了Sliding选项卡和查看分页器来获取导航选项卡.一切正常,但是当我移动到另一个选项卡时列表没有得到更新.OnResume()被调用,即使对象列表变量也在调试时更新,但可视化列表没有得到更新.

这里我是代码的一些片段:

对于Tab1:在我的情况下是ACTIVE选项卡

 @Override
    public void onResume() {
        super.onResume();

        if(!internetUtil.isConnectedToInternet(getActivity())){
            mSwipeRefreshLayout.setEnabled(false);
        }else{
            mSwipeRefreshLayout.setEnabled(true);
            new GetUsersFromServerTask().execute();  // Here i am making the network calls 
        }
}

在Tab2:哪个是存档选项卡

 @Override
    public void onResume() {
        super.onResume();
        new GetUsersArchivedFromServerTask().execute(); // Network calls
    }

在MainActivity中:

public class MaterialTab extends FragmentActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.material_main_sample);
        ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
        viewPager.setAdapter(new SampleFragmentPagerAdapter(getSupportFragmentManager()));
        PagerSlidingTabStrip tabsStrip = (PagerSlidingTabStrip) findViewById(R.id.tabs);
        tabsStrip.setViewPager(viewPager);
        tabsStrip.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                if(position == 0){
                   ActiveFragment activeFragment = new ActiveFragment();
                    final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
                    ft.detach(activeFragment);
                    ft.attach(activeFragment);
                    ft.commit();
                } if(position == 1){
                    ArchiveFragment archiveFragment = new ArchiveFragment();
                    final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
                    ft.detach(archiveFragment);
                    ft.attach(archiveFragment);
                    ft.commit();
                }
            }
        });
    }
}

还有就是当我在做SwipeRefresh时,List正在更新.我现在完全糊涂了为什么这种行为.当我滑动选项卡时,相同的方法被调用,并且该列表没有得到更新,但是当我正在进行SwipeRefresh时,它正在被更新.

这是活动片段:

public class ActiveFragment extends Fragment {

public void updateFragment(){
        new GetUsersArchivedFromServerTask().execute();
    }

 public class GetUsersArchivedFromServerTask extends AsyncTask<User, Void, String> {
        @Override
        protected String doInBackground(Shipment... parmas) {
            // Log.d(TAG, String.valueOf(shipmentDbHandler.getAllActiveShipments().size()));
            _userList1 = userDbHandler.getAllActiveUserByToday(DateTimeUtil.getCurrentTime());
            return "";
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected void onPostExecute(String str) {
            // Set the refresh Listener to false after the list has been loaded with new set of data
            if (mSwipeRefreshLayout.isRefreshing()) {
                mSwipeRefreshLayout.setRefreshing(false);
            }

            if(_userList1.size() == 0){
                ViewGroup parentOne = (ViewGroup) viewOne.getParent();
                if(parentOne != null){
                    parentOne.removeView(viewOne);
                }
            }

            if(_shipmentList1.size() > 0 ){
                mShipmentAdapter = new ShipmentAdapter(getActivity(),_userList1,1); 
                shipmentListView1.setAdapter(mShipmentAdapter);
                setListViewHeightBasedOnChildren(shipmentListView1);
                ViewGroup parentOne = (ViewGroup) viewOne.getParent();
                if(parentOne == null){
                    mainLayoutOne.addView(viewOne);
                }

                mShipmentAdapter.notifyDataSetChanged();
            }
            mSwipeRefreshLayout.setClickable(true);
        }
    }
}   

Answer 1

请用于FragmentStatePagerAdapter此目的。