android-architecture-components

问题 I want to execute some code by the end of an animation that I've set to an action, is there some way to add a listener to navigation controller action animation? 来源： https://stackoverflow.com/questions/55341088/how-to-add-listener-to-android-navigation-architecture-component-action-animatio

问题 I'm building a location app where I display background locations from a Room database in my MainActivity. I can get a ViewModel by calling locationViewModel = ViewModelProviders.of(this).get(LocationViewModel.class); locationViewModel.getLocations().observe(this, this); Periodic background locations should be saved to the Room database when I receive location updates via a BroadCastReceiver. They should be saved by calling locationViewModel.getLocations().setValue() public class

问题 I'm building a location app where I display background locations from a Room database in my MainActivity. I can get a ViewModel by calling locationViewModel = ViewModelProviders.of(this).get(LocationViewModel.class); locationViewModel.getLocations().observe(this, this); Periodic background locations should be saved to the Room database when I receive location updates via a BroadCastReceiver. They should be saved by calling locationViewModel.getLocations().setValue() public class

问题 Consider I have 3 classes User, Address, Location class Address { public String street; public String state; public String city; @ColumnInfo(name = "post_code") public int postCode; @Embedded(prefix = "home_") public Location homeLocation; @Embedded(prefix = "office_") public Location officeLocation; } class Location{ public long lat; public long lng; } @Entity class User { @PrimaryKey public int id; public String firstName; @Embedded(prefix = "addr_") public Address address; } How should i

问题 I have one case and wish to implement it by arch navigation component. For example I have 2 Nav Graphs (main and nested). Can I call main graph from nested and how? example 回答1: The point is to get the right NavController to navigate in the right graph. Let's take this scenario as an example: MainActivity |- MainNavHost |- NavBarFragment | |- NestedNavHost | | |-NestedContentFragment1 | | |-NestedContentFragment2 | | | |- BottomNavigationView | |- LoginFragment The main graph and the nested

问题 I'm using Paging library to paginate a list of items I'm retrieving from my server. Initially, when my fragment is loaded, it returns an empty list. But after changing fragments and going back to that fragment, I can see the list loaded. After debugging I saw that data was actually being fetched, but an empty list was passed to my fragment. ItemDataSource: @Override public void loadInitial(@NonNull LoadInitialParams<Integer> params, @NonNull LoadInitialCallback<Integer, Item> callback) {

问题 I am using Navigation component, and I have a bottom navigation view in the main activity. when I tap the tab in that bottom navigation view, it seems that there is a fade in animation when the fragment appear. I don't think I manually set the animation, it seems that the animation will be there by default. I want to remove that animation. here is the code I use in my Main Activity. class MainActivity : AppCompatActivity(), NavController.OnDestinationChangedListener { private lateinit var

问题 I am using Navigation component, and I have a bottom navigation view in the main activity. when I tap the tab in that bottom navigation view, it seems that there is a fade in animation when the fragment appear. I don't think I manually set the animation, it seems that the animation will be there by default. I want to remove that animation. here is the code I use in my Main Activity. class MainActivity : AppCompatActivity(), NavController.OnDestinationChangedListener { private lateinit var

问题 When I'm trying to break query for better readability/comprehension it stops being checked by IDE. This occurs on Android Studio 3.2 canary 16 and 3.1.2 stable, kotlin version 1.2.41. When Room DAO is java class/interface everything works fine. Is it possible to have the same checking/highlighting for 2+ rows queries in kotlin as in java? 回答1: This is supposed to be resolved in AS 3.6, but, for now, the workaround noted at https://issuetracker.google.com/issues/130141151#comment3 does the

问题 I am following this tutorial to learn ViewModel and LiveData. In my case, instead of getting data from network, I am simply generating random string on button click and trying to update a textview. The problem is that the textview does not get updated when the data is changed by button click, but only gets updated when orientation is toggled. Activity Class (extends LifecycleActivity) public class PScreen extends BaseActivity { @Override protected void onCreate(@Nullable Bundle