I followed your instructure but I get this error
Attempt to invoke virtual method 'void androidx.lifecycle.MutableLiveData.postValue(java.lang.Object)' on a null object reference
I checked everything but I couldn't find the problem

my code
`

class NewsViewModel(
private val newsRepository: NewsRepository
) : ViewModel() {

val breakingNews: MutableLiveData<Resource<NewsResponse>> = MutableLiveData()
private var breakingNewsPage = 1

init {
    getBreakingNews("us")
}

private fun getBreakingNews(countryCode: String) = viewModelScope.launch {
    breakingNews.postValue(Resource.Loading())
    val response = newsRepository.getBreakingNews(countryCode, breakingNewsPage)
    breakingNews.postValue(handleBreakingNewsResponse(response))
}

private fun handleBreakingNewsResponse(response: Response<NewsResponse>) : Resource<NewsResponse> {
    if(response.isSuccessful) {
        response.body()?.let { resultResponse ->
            return Resource.Success(resultResponse)
        }
    }
    return Resource.Error(response.message())
}

}

`

Internet permission is given, API key is generated but still getting the error

HTTP FAILED: java.net.UnknownHostException: Unable to resolve host "newsapi.org": No address associated with hostname

Though the link gets called successfully (receives required data) in the browser but in the android studio, it throws the above error

I am getting this error, Checked on Stackoverflow but didn't get any solution for it.
My files

NewsResponse.kt

package com.androiddevs.mvvmnewsapp.ui.pojo

data class NewsResponse(
    val articles: List<Article>,
    val status: String,
    val totalResults: Int
)

Article.kt

package com.androiddevs.mvvmnewsapp.ui.pojo

import androidx.room.Entity
import androidx.room.PrimaryKey


@Entity(
    tableName = "articles"
)
data class Article(
    @PrimaryKey(autoGenerate = true)
    var id: Int? = null,
    val author: String,
    val content: String,
    val description: String,
    val publishedAt: String,
    val source: Source,
    val title: String,
    val url: String,
    val urlToImage: String
)

Getting this error when Navigating from breaking news screen to article screen

Press the save button as many times as the news goes to the saves page. Once pressed it shouldn't be over and over again. Help please

Compiler giving " Inheritance from an interface with '@JvmDefault' members is only allowed with -Xjvm-default option " error
to NewsViewModelProviderFactory class

im getting

Caused by: android.view.InflateException: Binary XML file line #25 in com.androiddevs.mvvmnewsapp:layout/activity_news: Binary XML file line #25 in com.androiddevs.mvvmnewsapp:layout/activity_news: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #25 in com.androiddevs.mvvmnewsapp:layout/activity_news: Error inflating class fragment
Caused by: kotlin.UninitializedPropertyAccessException: lateinit property viewModel has not been initialized
at com.androiddevs.mvvmnewsapp.ui.NewsActivity.getViewModel(NewsActivity.kt:15)
at com.androiddevs.mvvmnewsapp.ui.fragments.BreakingNewsFragment.onViewCreated(BreakingNewsFragment.kt:25)

and app crashes

I followed your instructure but I get this error
Attempt to invoke virtual method 'void androidx.lifecycle.MutableLiveData.postValue(java.lang.Object)' on a null object reference
I checked everything but I couldn't find the problem

my code
`

class NewsViewModel(
private val newsRepository: NewsRepository
) : ViewModel() {

val breakingNews: MutableLiveData<Resource<NewsResponse>> = MutableLiveData()
private var breakingNewsPage = 1

init {
    getBreakingNews("us")
}

private fun getBreakingNews(countryCode: String) = viewModelScope.launch {
    breakingNews.postValue(Resource.Loading())
    val response = newsRepository.getBreakingNews(countryCode, breakingNewsPage)
    breakingNews.postValue(handleBreakingNewsResponse(response))
}

private fun handleBreakingNewsResponse(response: Response<NewsResponse>) : Resource<NewsResponse> {
    if(response.isSuccessful) {
        response.body()?.let { resultResponse ->
            return Resource.Success(resultResponse)
        }
    }
    return Resource.Error(response.message())
}

}

`

When the internet was down, and after it comes back, there is no way to refresh the empty recycler view.

Where I get an error

Architectural Skeleton - MVVM News App Around 4:00

NewsActivity.kt. (onCreate function.)

override fun onCreate(SavedInstanceState: Bundle?){

......

val repository = NewsRepository(ArticleDatabase(this)
# In this line following error occured.
/*
Error
Type mismatch. 
Required: ArticleDatabase
Found:Unit
*/
}

I changed 'invoke' function in ArticleDatabase.kt as follows and it seems works without snag(I don't know it is right way or not though....)

operator fun invoke (context:Context) : ArticleDatabase {
return instance ?: synchronized(LOCK){
instance ?: createDatabase(context).also{ instance = it }
}

Thank you for your awesome videos and great instruction!!

After I search once, I enter a new query, and new articles load at the end of the previous search results.

Hi Philipp,

not really an issue but sth that I do not really understand. I'd like to use view bindings instead of the kotlin android extensions. When I try to transfer the example, I have issues to integrate the bindings into the fragments. Do you have a tutorial to look at?

Thank you for your great work btw!