android-architecture-components

问题 I have been try to implemented the Paging Library with Room provided by google in Android Architecture Component.But its showing compile time error in my UserDao Class Here is the Error: Error:(22, 42) error: Not sure how to convert a Cursor to this method's return type My Question is what return Type ? UserDao.java @Dao public interface UserDao { @Query("SELECT * FROM user") LiveData<List<User>> getAll(); //Compile Error is here : Not sure how to convert a Cursor to this method's return type

问题 My question is how to update item in PagedList? In my case, there are ListActivity and DetailsActivity. List activity is using Paging component to get posts from network(only) and shows it in recycler view using paged adapter. When user is pressing on some post, I need to get post details and show it at the DetailsActivity. I am making another request to the server and it returns me post details. After that call, server increases viewsCount value of that post and when user returns to the

问题 I am actually not sure, how the correct way or the best practice to set different toolbar using navigation controller component in my app. I want to set 2 different toolbars. green toolbar red toolbar two toolbars with different colour. this is just to simplify the case, actually I have multiple toolbars I am using navigation controller component. and currently on my Main Activity as the host, I set the green toolbar in my main activity using this code setSupportActionBar(green_toolbar)

问题 According to the official Design docs for Action Chips, we are supposed to be able to add a progress state to chips. Sadly, the Development docs don't mention this at all. Has anyone managed to figure out how to achieve the effect shown here? 回答1: It is possible to implement this behavior using the chipIcon attribute and androidx.swiperefreshlayout.widget.CircularProgressDrawable . xml app:chipIconWithProgress="@{viewModel.taskIsStarting ? null : @drawable/ic_play_arrow}" and BindingAdapter

问题 Over the past days I have been getting comfortable with Android Architecture Components and I've been mostly interested in the Paging Library for handling and displaying lists of data from a remote source. For the best UX it is better to load data first into the database, in this case Room then display it in a recyclerview using the pagingLibrary and adapters. My concern is this, lets say an api has 1000s of records or a twitter feed even and all this data has to pass through the db then to

问题 Over the past days I have been getting comfortable with Android Architecture Components and I've been mostly interested in the Paging Library for handling and displaying lists of data from a remote source. For the best UX it is better to load data first into the database, in this case Room then display it in a recyclerview using the pagingLibrary and adapters. My concern is this, lets say an api has 1000s of records or a twitter feed even and all this data has to pass through the db then to

问题 I am using Navigation Component in my app , recently it was working correctly but after updating project to AndroidX I am getting error navigation destination DESTINATION_NAME is unknown to this NavController only if that destination(Which I'm going to open) is previously closed from itself using navController.popBackStack() . Also, There is no error if I close DESTINATION fragment from MainActivity , But Error only Occurs fragment is closed from itself using popBackStack . like below

问题 Having app using LiveData with ViewModel for UI to observe the data update in the repository. It is working fine. Now someone brought it up the "LiveData has not been well adopted, maybe it should be switch to use coroutines' channel". First of all not sure the statement about LiveData is accurate or not. I am sure with coroutines' feature it could be done without LiveData. But I feel every one has its targeted task, and from the speech/sample of Google the LiveData is built with Android

问题 Having app using LiveData with ViewModel for UI to observe the data update in the repository. It is working fine. Now someone brought it up the "LiveData has not been well adopted, maybe it should be switch to use coroutines' channel". First of all not sure the statement about LiveData is accurate or not. I am sure with coroutines' feature it could be done without LiveData. But I feel every one has its targeted task, and from the speech/sample of Google the LiveData is built with Android

问题 I am trying to (at least partially) determine when an application gets closed by the user to release some connections, etc. To do this, I am using the ProcessLifecycleOwner with my application class implementing LifecycleObserver . Despite taking the starting code from tutorials and other helpful articles, it does not seem to detect any lifecycle events. Most of the code came from this example. My application class: public class App extends Application implements LifecycleObserver { @Override