public class MyLiveData extends LifecycleLiveData<String> {
private String data;
@Override
protected void onActive() {
data = "Hello, Lifecycle LiveData!";
postValue(data);
}
@Override
protected void onInactive() {
data = null;
}
}
public class MainActivity extends AppCompatActivity {
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = findViewById(R.id.textView);
MyLiveData myLiveData = new MyLiveData();
myLiveData.observe(this, new Observer<String>() {
@Override
public void onChanged(String s) {
textView.setText(s);
}
});
}
}
