android-livedata

I am working on an app that queries the github api to get a list of user and i'm following the recommended android architecture component guide . Once the data is fetched from the network, I store it locally using Room DB and then display it on the UI using ViewModel that observes on the LiveData object (this works fine). However, I want to be able to have a button which when clicked would trigger a refresh action and perform a network request to get new data from the API if and only if there is a network connection. The issue is when I click the button, two network calls are triggered, one

I want to write a unit test. Therefore I need MutableLiveData. I started with a very basic test for setup but I cannot instantiate a MutableLiveData object. I is always null when I run the test. Do I have to mock anything? Any suggestions? @RunWith(MockitoJUnitRunner.class) public class DefaultLiveDataTest { private static final int EXPECTED = 5; private final MutableLiveData<Integer> underTest = new MutableLiveData<>(); @Test public void exampleTest() { underTest.setValue(EXPECTED); //underTest is Null assertEquals(underTest.getValue().intValue(), EXPECTED); } } java.lang.NullPointerException

I implemented caching with room but for some reason it got spoiled, either it does not insert or does not get the data, I've done lot of debugging though, but still no any clue... Can someone help with this? So, the picture is following: MainActivity: mArticleViewModel = ViewModelProviders.of(this).get(ArticleViewModel.class); mArticleViewModel.getArticleList(mPageNumber).observe(this, articles -> { /* doesn't matter */ }); ViewModel: public class ArticleViewModel extends AndroidViewModel { public static final String TAG = "ArticleViewModel"; private LiveData<List<Article>> articleList;

PagedList<Object> is used for Android's cool paging library. To make the question as minimal as possible : If i have a list of strings like List<String> stringList; // it consists of 200 strings I want to convert stringList to type PagedList<String> like PagedList<String> pagedStringList; And also if i have a PagedList<Object> how can convert it to a List<Object> ? I went through this for reference If i try the other way round .... How can I convert List<Object> into DataSource.Factory<Integer, Object> ..so that indirectly i can convert it into PagedList<> ? From DataSource.Factory<Integer,

I've added some code to make my question more clear. Retrofit interface: public interface JsonPlaceHolderAPI { public static final String BASE_URL = "https://jsonplaceholder.typicode.com/"; @GET("todos/{number}") Call<ResponseBody> getJsonResponse(@Path("number") String number); } The repository: --> fetchResponse() takes Viewmodel's MutableLiveData as parameter and uses it to update its value and then trigger View to change its UI. public class Repository { private final JsonPlaceHolderAPI api; public Repository() { Retrofit retrofit = new Retrofit.Builder() .baseUrl(BASE_URL) .build(); api =

Apparently, Room is not able to handle MutableLiveData and we have to stick to LiveData as it returns the following error: error: Not sure how to convert a Cursor to this method's return type I created a "custom" MutableLiveData in my DB helper this way: class ProfileRepository @Inject internal constructor(private val profileDao: ProfileDao): ProfileRepo{ override fun insertProfile(profile: Profile){ profileDao.insertProfile(profile) } val mutableLiveData by lazy { MutableProfileLiveData() } override fun loadMutableProfileLiveData(): MutableLiveData<Profile> = mutableLiveData inner class