onresume

问题 I have a WebView in my Android app, and I need to run a JavaScript function whenever the app/WebView is switched to (e.g. using the app switcher or tapping the icon from the home screen) the device wakes from sleep (with the app having still been on the screen when the device went to sleep). Using a visibilitychange event listener in my webpage javascript only works for case 1. Ideally I would like to trigger some kind of javascript event using the Android onResume() java function, but how?

问题 when is the "best moment" to load a new ad from AdMob? I'm programming a shopping list application that has an admob banner on its main screen. First I called m_AdView.loadAd(new AdRequest()); in the the onCreate() method. But so I always got displayed the same ad. Now I want to put the call into onResume(). But isn't there the chance to cause too much network traffic? 回答1: The best place to load the adMob is in the onCreate() . So, I would just leave it in the onCreate() method. Don't worry

问题 I hope I understand how didChangeAppLifecycleState worked correctly. I have page A and page B . When I click the back device button from page B ( Navigator.of(context).pop(); ), I expect didChangeAppLifecycleState in pageA will get called, but it doesn't. PageA class _ABCState extends State<ABCrList> with WidgetsBindingObserver { @override void initState() { super.initState(); WidgetsBinding.instance.addObserver(this); .... } @override void dispose() { WidgetsBinding.instance.removeObserver

问题 I hope I understand how didChangeAppLifecycleState worked correctly. I have page A and page B . When I click the back device button from page B ( Navigator.of(context).pop(); ), I expect didChangeAppLifecycleState in pageA will get called, but it doesn't. PageA class _ABCState extends State<ABCrList> with WidgetsBindingObserver { @override void initState() { super.initState(); WidgetsBinding.instance.addObserver(this); .... } @override void dispose() { WidgetsBinding.instance.removeObserver

问题 I hope I understand how didChangeAppLifecycleState worked correctly. I have page A and page B . When I click the back device button from page B ( Navigator.of(context).pop(); ), I expect didChangeAppLifecycleState in pageA will get called, but it doesn't. PageA class _ABCState extends State<ABCrList> with WidgetsBindingObserver { @override void initState() { super.initState(); WidgetsBinding.instance.addObserver(this); .... } @override void dispose() { WidgetsBinding.instance.removeObserver

问题 Following is My Log Repost Fatal Exception: java.lang.RuntimeException: Unable to resume activity {com.maruticourier.android/com.marutideliver.activity.MainActivity}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3069) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3098) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1350) at android.os

问题 I have InnerFragment containing RecyclerView, inside MainFragment which is added to ViewPager . When MainFragment gets created while swiping OnResume is called multiple times 1st time : OnResume called once in MainFragment and Once in InnerFragment 2n time : OnResume called once in MainFragment and Twice in InnerFragment 3rd time : OnResume called once in MainFragment and Thrice in InnerFragment Adding MainFragment in ViewPager //Assigning Adapter in ViewPager mViewPager.setAdapter(new

问题 I have InnerFragment containing RecyclerView, inside MainFragment which is added to ViewPager . When MainFragment gets created while swiping OnResume is called multiple times 1st time : OnResume called once in MainFragment and Once in InnerFragment 2n time : OnResume called once in MainFragment and Twice in InnerFragment 3rd time : OnResume called once in MainFragment and Thrice in InnerFragment Adding MainFragment in ViewPager //Assigning Adapter in ViewPager mViewPager.setAdapter(new

问题 How can I reload SharedPreferences when I resume from one activity to another? If I resume, it is possible that user has changed the settings. Is it possible to reload SharedPreferences or do I need to refresh/reload activity. And if, then how? 回答1: There is no difference in how you get and set SharedPreferences normally and from doing so in onResume . What you will need to do in addition to getting the most recent preferences, is update any objects you have in the Activity that use

问题 I am using several fragment s to be dynamically added into activity . Everything works fine, when I press back-button, the fragment s go to backstack . And when I resume it, it appears. But everytime on Resume , it is recreating the fragment and call onCreateView . I know it is a normal behavior of the fragment lifecycle. This is my onCreateView : @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate( R