Cannot resolve symbol ViewModelProviders on AppCompatActivity

Hey I'm trying to get my ViewModel working, but no luck so far.
Android Studio shows error Cannot resolve symbol 'ViewModelProviders'.

Cannot resolve symbol 'ViewModelProviders'

Every other question I found on this topic was correcting extends Activity to extends AppCompatActivity, but I am extending the right one. Not sure what I'm missing...

My code is based on This YouTube video

extends Activity

extends AppCompatActivity

MainActivity.java

public class MainActivity extends AppCompatActivity implements
TileAdapter.TileAdapterOnClickHandler {


private BaseViewModel viewModel;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//set Toolbar
Toolbar myToolbar = findViewById(R.id.toolbar);
setSupportActionBar(myToolbar);


//initialize viewModel
viewModel = ViewModelProviders.of(this).get(BaseViewModel.class);


BaseViewModel.java

public class BaseViewModel extends ViewModel {

private Movie mMovie;

public void init (Movie movies)
this.mMovie = movies;


public Movie getMovie()
return mMovie;



import

ViewModel

6 Answers
6

I didn't have both dependencies in my build, hence the problem.

implementation "android.arch.lifecycle:extensions:1.1.0"
implementation "android.arch.lifecycle:viewmodel:1.1.0"


Thanks @Muthukrishnan Rajendran

If you are using androidx you need this:

androidx

implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0-rc01'


If you are using compiled sdk version 28 or higher you only need to add single dependecy to get ViewModel and LiveData

ViewModel

LiveData

dependencies
//...
def lifecycle_version = "1.1.1"

// ViewModel and LiveData
implementation "android.arch.lifecycle:extensions:$lifecycle_version"



In the build.gradle file, add these lines in the dependencies block

dependencies
...
def lifecycle_version = "1.1.1"
// ViewModel and LiveData
implementation "android.arch.lifecycle:extensions:$lifecycle_version"
//if not using java 8,use the following line
annotationProcessor "android.arch.lifecycle:compiler:$lifecycle_version"
//if using java 8,ignore above line and add the following line
implementation "android.arch.lifecycle:common-java8:$lifecycle_version"
...



you should add library in your project's build.gradle

def lifecycle_version = "2.0.0"

// ViewModel and LiveData
implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"


Use androix libraries

androix

Change

implementation 'com.android.support:appcompat-v7:28.0.0'

implementation 'com.android.support:appcompat-v7:28.0.0'

to

implementation 'androidx.appcompat:appcompat:1.1.0-alpha03'

implementation 'androidx.appcompat:appcompat:1.1.0-alpha03'

You can use

Refactor>Migrate to AndroidX


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