setUserVisibleHint called before onCreateView in Fragment
Solution 1:
// create boolean for fetching data
private boolean isViewShown = false;
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (getView() != null) {
isViewShown = true;
// fetchdata() contains logic to show data when page is selected mostly asynctask to fill the data
fetchData();
} else {
isViewShown = false;
}
}
Use isViewShown
instance variable to decide whether to fetch data in onCreateView()
or in setUserVisibleHint()
.
Below code contains logic for onCreateView()
:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.main_layout, container, false);
// view initialization steps.......
if (!isViewShown) {
fetchData();
}
// do other stuff
}
This code will solve your problem. As It solved my problem. :)
This trick will fetch data in onCreateView()
for direct jumping from one page to another, whereas when you swipe the view it will fetch the data from setUserVisibleHint()
method. :)
Solution 2:
you can use this logic, also you can turn off viewDidAppear
any time by setting isVisible = false
public class MyFragment extends Fragment {
private Boolean isStarted = false;
private Boolean isVisible = false;
@Override
public void onStart() {
super.onStart();
isStarted = true;
if (isVisible && isStarted){
viewDidAppear();
}
}
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
isVisible = isVisibleToUser;
if (isStarted && isVisible) {
viewDidAppear();
}
}
public void viewDidAppear() {
// your logic
}
}
Solution 3:
I found the best solution
private boolean isVisible;
private boolean isStarted;
@Override
public void onStart() {
super.onStart();
isStarted = true;
if (isVisible)
sendRequest(); //your request method
}
@Override
public void onStop() {
super.onStop();
isStarted = false;
}
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
isVisible = isVisibleToUser;
if (isVisible && isStarted)
sendRequest(); //your request method
}
It's improved version of fareed namrouti's answer. I tested this on many conditions. It's safe.