public class MyViewModel extends ViewModel {
private MutableLiveData<String> data;
public MutableLiveData<String> getData() {
if (data == null) {
data = new MutableLiveData<>();
}
return data;
}
@Override
protected void onCleared() {
super.onCleared();
}
}
public class MainActivity extends AppCompatActivity {
private MyViewModel viewModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewModel = new ViewModelProvider(this).get(MyViewModel.class);
viewModel.getData().observe(this, new Observer<String>() {
@Override
public void onChanged(String s) {
}
});
}
}
public class MyObserver implements LifecycleObserver {
@OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
public void onCreate() {
}
@OnLifecycleEvent(Lifecycle.Event.ON_START)
public void onStart() {
}
@OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
public void onResume() {
}
@OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
public void onPause() {
}
@OnLifecycleEvent(Lifecycle.Event.ON_STOP)
public void onStop() {
}
@OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
public void onDestroy() {
}
}
public class MainActivity extends AppCompatActivity implements LifecycleOwner {
private LifecycleRegistry lifecycleRegistry;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lifecycleRegistry = new LifecycleRegistry(this);
getLifecycle().addObserver(new MyObserver());
}
@NonNull
@Override
public Lifecycle getLifecycle() {
return lifecycleRegistry;
}
}
