https://github.com/codepath/android_guides/wiki/Sliding-Tabs-with-PagerSlidingTabStrip
我使用滑动选项卡和ViewPager来获取导航选项卡。一切都正常工作,但是当我移动到其他选项卡时,列表不会得到更新。在调试时,OnResume()被调用,并且对象列表变量也得到了更新,但是列表在视觉上没有得到更新。以下是一些代码片段:
对于我的情况下的Tab1:即活动选项卡
@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上:这是存档选项卡。
@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();
}
}
});
}
}
同时,当我进行下拉刷新时,列表会得到更新。我现在完全困惑了为什么会出现这种行为。当我滑动选项卡时,调用的是同样的方法,但列表没有被更新,但当我进行下拉刷新时,它会被更新。
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);
}
}
}