public class MyViewModel extends ViewModel {
private MutableLiveData<String> data;
public LiveData<String> getData() {
if (data == null) {
data = new MutableLiveData<>();
loadData();
}
return data;
}
private void loadData() {
new Thread(new Runnable() {
@Override
public void run() {
String newData = "Hello, LiveData!";
data.setValue(newData);
}
}).start();
}
}
public class MainActivity extends AppCompatActivity {
private MyViewModel viewModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewModel = ViewModelProviders.of(this).get(MyViewModel.class);
final TextView textView = findViewById(R.id.text_view);
viewModel.getData().observe(this, new Observer<String>() {
@Override
public void onChanged(String newData) {
textView.setText(newData);
}
});
}
}
