[英]How to refresh or update all fragment from the viewpager android
I have viewpager with tablayout, and have 3 fragment in it.我有带 tablayout 的 viewpager,里面有 3 个片段。 In my fragment 2 and 3 , I have swipe to refresh to update data from firebase database.
在我的片段 2 和 3 中,我通过滑动刷新来更新 firebase 数据库中的数据。
I want it refresh with 1 button in toolbar, and refresh all of the fragment inside it.我希望它用工具栏中的 1 个按钮刷新,并刷新其中的所有片段。
1 more problem is, i have to swipe refresh 2 times the fragment to update the recyclerview..... I dont know how to do it, please help还有一个问题是,我必须将片段刷新 2 次才能更新 recyclerview ..... 我不知道该怎么做,请帮忙
TwoFragment两个片段
public static final String TAG = "TWO_FRAGMENT";
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser) {
} else {
mAuth = FirebaseAuth.getInstance();
userRef = FirebaseDatabase.getInstance().getReference("user_course");
users = FirebaseAuth.getInstance().getCurrentUser();
daftarTugasRef = FirebaseDatabase.getInstance().getReference("tugas");
mTugasRef = FirebaseDatabase.getInstance().getReference("tugas_course");
mFlagTugas = FirebaseDatabase.getInstance().getReference("flag_tugas");
LoadData();
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
setHasOptionsMenu(true);
v = inflater.inflate(R.layout.fragment_two, container, false);
swipeLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
new Handler().postDelayed(new Runnable() {
@Override public void run() {
LoadData();
swipeLayout.setRefreshing(false);
listTugas.clear();
}
private void onLoaded() {
swipeLayout.setEnabled(true);
swipeLayout.setRefreshing(false);
}
}, 500);
}
});
MainActivity主要活动
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
viewPager = (ViewPager) findViewById(R.id.viewpager);
viewPager.setOffscreenPageLimit(3);
setupViewPager(viewPager);
viewPager.setCurrentItem(position);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
reloadFragment("TWO_FRAGMENT");
setupTabIcons();
}
private void setupViewPager(ViewPager viewPager) {
adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new OneFragment(), "ONE");
adapter.addFrag(new TwoFragment(), "TWO");
adapter.addFrag(new ThreeFragment(), "THREE");
viewPager.setAdapter(adapter);
viewPager.getAdapter().notifyDataSetChanged();
}
class ViewPagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public int getItemPosition(@NonNull Object object) {
return POSITION_NONE;
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
// viewPager.getAdapter().notifyDataSetChanged();
// adapter.notifyDataSetChanged();
}
@Override
public void onPageScrollStateChanged(int state) {
}
protected void reloadFragment(String TAG){
// Reload current fragment
Fragment frg = null;
frg = this.getSupportFragmentManager().findFragmentByTag(TAG);
FragmentTransaction ft =this.getSupportFragmentManager().beginTransaction();
ft.detach(frg);
ft.attach(frg);
ft.commit();
}
You can use EventBus , put this in all your fragments:您可以使用EventBus ,将其放入所有片段中:
@Override
public void onStart() {
super.onStart();
EventBus.getDefault().register(this);
}
@Override
public void onStop() {
super.onStop();
EventBus.getDefault().unregister(this);
}
@Subscribe(threadMode = ThreadMode.MAIN)
public void onEvent(ViewEvent viewEvent) {
if (viewEvent.getMessage().equals("updateViews")) {
updateView();
}
}
and when you want to update you can send an event like this:当您想要更新时,您可以发送这样的事件:
EventBus.getDefault().post(new ViewEvent("updateViews"));
PS : ViewEvent is an object that you must create with what to send to all suscribed fragments. PS :ViewEvent 是一个您必须创建的对象,其中包含要发送到所有订阅片段的内容。
public class ViewEvent {
private String message;
public ViewEvent( String message) {
this.message = message;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
Just call the following method on your button click to refresh the Fragments -只需在按钮单击上调用以下方法即可刷新片段 -
protected void reloadFragment(String TAG){
// Reload current fragment
Fragment frg = null;
frg = getActivity().getSupportFragmentManager().findFragmentByTag(TAG);
FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
ft.detach(frg);
ft.attach(frg);
ft.commit();
}
Declare your TAG variable inside the Fragment by the following line of code -通过以下代码行在 Fragment 中声明您的 TAG 变量 -
public static final String TAG = "HOME_FRAGMENT";
and whenever you are pushing the Fragment in your activity kindly use the same TAG like this -每当您在活动中推送 Fragment 时,请像这样使用相同的 TAG -
getSupportFragmentManager().beginTransaction().setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out, android.R.anim.fade_in, android.R.anim.fade_out).replace(container, fragment, tag).commit();
You just need to have a TAG for each of your Fragment.您只需要为每个 Fragment 设置一个 TAG。 Hope you will get the solution using this.
希望你能用这个得到解决方案。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.