friend request update issue. fix #153

Author: imndx

chat/src/main/java/cn/wildfire/chat/kit/WfcUIKit.java

@@ -68,7 +68,6 @@ public void onForeground() {
             @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
             public void onBackground() {
                 isBackground = true;
-                viewModelStore.clear();
             }
         });
 

chat/src/main/java/cn/wildfire/chat/kit/contact/ContactListFragment.java

@@ -66,8 +66,8 @@ private void loadContacts() {
     public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
         View view = super.onCreateView(inflater, container, savedInstanceState);
 
-        contactViewModel.contactListUpdatedLiveData().observeForever(contactListUpdateLiveDataObserver);
-        contactViewModel.friendRequestUpdatedLiveData().observeForever(friendRequestUpdateLiveDataObserver);
+        contactViewModel.contactListUpdatedLiveData().observe(this, contactListUpdateLiveDataObserver);
+        contactViewModel.friendRequestUpdatedLiveData().observe(this, friendRequestUpdateLiveDataObserver);
 
         userViewModel = WfcUIKit.getAppScopeViewModel(UserViewModel.class);
         userViewModel.userInfoLiveData().observeForever(userInfoLiveDataObserver);
@@ -77,8 +77,6 @@ public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup c
     @Override
     public void onDestroyView() {
         super.onDestroyView();
-        contactViewModel.contactListUpdatedLiveData().removeObserver(contactListUpdateLiveDataObserver);
-        contactViewModel.friendRequestUpdatedLiveData().removeObserver(friendRequestUpdateLiveDataObserver);
         userViewModel.userInfoLiveData().removeObserver(userInfoLiveDataObserver);
     }
 

chat/src/main/java/cn/wildfire/chat/kit/contact/newfriend/FriendRequestListFragment.java

@@ -9,7 +9,6 @@
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
-import androidx.lifecycle.ViewModelProviders;
 import androidx.recyclerview.widget.DividerItemDecoration;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
@@ -45,7 +44,7 @@ public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup c
     }
 
     private void init() {
-        contactViewModel = ViewModelProviders.of(this).get(ContactViewModel.class);
+        contactViewModel = WfcUIKit.getAppScopeViewModel(ContactViewModel.class);
         UserViewModel userViewModel = WfcUIKit.getAppScopeViewModel(UserViewModel.class);
         userViewModel.userInfoLiveData().observe(this, userInfos -> {
             if (adapter != null) {