Android ViewModelProvider.of() 找不到符号

Question

I tried to get my custom ViewModel 'ViewModelSavegame' with the ViewModelProvider to set a Observer.

viewModelSavegame = ViewModelProvider.of(this).get(ViewModelSavegame.class);
        viewModelSavegame.GetSavegameName().observe(this, new Observer<String>()
        {
            @Override
            public void onChanged(String s)
            {
                TextView title = (TextView) findViewById(R.id.textViewTitel);
                title.setText(s);
            }
        });

In the Gradle build (module:app) I have dependencies

implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation "androidx.lifecycle:lifecycle-viewmodel:2.2.0"
implementation "androidx.lifecycle:lifecycle-livedata:2.2.0"
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

But ViewModelProvider. of () create the error:

error: cannot find symbol viewModelSavegame = ViewModelProvider.of(this).get(ViewModelSavegame.class); ^ symbol: method of(SavegameTabbedActivity)

Did I missed something maybe a dependencie?

Answer 1

将代码从 ViewModelProvider.of(this).get(ViewModelSavegame.class) 更改为 ViewModelProvider(this).get(ViewModelSavegame.class)。

Answer 2

Solution:

Use
viewModelSavegame = ViewModelProvider.AndroidViewModelFactory.getInstance(getApplication()).create(ViewModelSavegame.class);

Maybe someone can provide further information, but of() seems to be replaced with getInstance(). I hope this is the correct way to use this in an TabbedActivity and their fragments to provide the same view model, but at least it works, without crashing the app.