android: how do I check if dialogfragment is showing
AndroidAndroid LayoutAndroid FragmentsAndroid DialogfragmentAndroid Problem Overview
I launch my dialog fragment using
FragmentTransaction ft =
getFragmentManager().beginTransaction();
MyDialogFragment dialog = new MyDialogFragment()
dialog.show(ft, "dialog");
then to get a handle on it I do
Fragment prev = getFragmentManager().findFragmentByTag("dialog");
but once I get prev
, how do I check if it is showing?
Back Story
My problem is that my looping code keeps launching the dialog again and again. But if the dialog is already showing, I don't want it to launch again. This back story is just for context. The answer I seek is not: "move it out of the loop."
Android Solutions
Solution 1 - Android
if (dialogFragment != null
&& dialogFragment.getDialog() != null
&& dialogFragment.getDialog().isShowing()
&& !dialogFragment.isRemoving()) {
//dialog is showing so do something
} else {
//dialog is not showing
}
UPDATE: team can you also try the below call, i think it will work logically:
dialogFragment.isResumed
that should mean its in the foreground displaying if im not mistaken.
Solution 2 - Android
I added this to be inside my custom dialog fragment, so I don't have to worry about any logic on the outside. Override the show()
and onDismiss()
methods, with a boolean shown
field:
private static boolean shown = false;
@Override
public void show(FragmentManager manager, String tag) {
if (shown) return;
super.show(manager, tag);
shown = true;
}
@Override
public void onDismiss(DialogInterface dialog) {
shown = false;
super.onDismiss(dialog);
}
If you want to check whether it is shown or not, you can create a getter for the shown
boolean.
Solution 3 - Android
simply check if it's null
if(prev == null)
//There is no active fragment with tag "dialog"
else
//There is an active fragment with tag "dialog" and "prev" variable holds a reference to it.
Alternatively, you could check the activity the fragment prev
is currently associated with, however, make sure you ask that after you make sure it's not null or you'll get a NullPointerException. Like this:
if(prev == null)
//There is no active fragment with tag "dialog"
else
if(prev.getActivity() != this) //additional check
//There is a fragment with tag "dialog", but it is not active (shown) which means it was found on device's back stack.
else
//There is an active fragment with tag "dialog"
Solution 4 - Android
100% Uptime
class ProgressDialogFragment : DialogFragment() {
companion object {
private val TAG = this::class.simpleName
}
lateinit var dialogFragmentManager: FragmentManager
fun showDialog() {
dialogFragmentManager.apply {
if (findFragmentByTag(TAG) == null) show(this, TAG) else return
}
}
}
lateinit var progressDialog: ProgressDialogFragment
Init:
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
initProgressDialog(supportFragmentManager)
}
fun initProgressDialog(fragmentManager: FragmentManager){
progressDialog = ProgressDialogFragment().apply {
dialogFragmentManager = fragmentManager
}
}
Use { progressDialog.showDialog() } everywhere
Solution 5 - Android
Kotlin style:
private fun showDialog(dialogFragment: DialogFragment, tag: String) {
supportFragmentManager.findFragmentByTag(tag).let { fragment ->
fragment ?: let {
supportFragmentManager.beginTransaction().let { transition ->
dialogFragment.show(transition, tag)
}
}
}
}