lifecycle

Cancel All Subscriptions and Asyncs in the componentWillUnmount Method, how?

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You can use isMounted React pattern to avoid memory leaks here. In your constructor: constructor(props) { super(props); this._isMounted = false; // rest of your code } componentDidMount() { this._isMounted = true; this._isMounted && this.getImage(this.props.item.image); } in your componentWillUnmount componentWillUnmount() { this._isMounted = false; } While in you getImage() async getImage(img) { let imgUri = await … Read more

onResume() and onPause() for widgets on Flutter

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There is an abstract class caller WidgetsBindingObserver https://docs.flutter.io/flutter/widgets/WidgetsBindingObserver-class.html in @override void didChangeAppLifecycleState(AppLifecycleState state) { setState(() { _notification = state; }); } there is the “state”, can be manage as switch(state) { case AppLifecycleState.resumed: // Handle this case break; case AppLifecycleState.inactive: // Handle this case break; case AppLifecycleState.paused: // Handle this case break; case AppLifecycleState.suspending: // … Read more

JSF skip Required-Validation without immediate=true

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Each Button creates an entry inside the Param-List as long as it’s member of the form. So I simple applied a check for the presence of that entry to the “required” parameter: <h:form id=”form” prependId=”true”> … <p:inputText id=”someId” required=”#{param[‘form:save’]==null}” … /> … <p:commandButton id=”save” value=”Save” /> <p:commandButton id=”submit” value=”Submit” /> <p:commandButton id=”cancel” value=”Cancel” immediate=”true” /> … Read more

Videoview Pausing and resuming

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You can use this @Override public void onPause() { Log.d(TAG, “onPause called”); super.onPause(); stopPosition = videoView.getCurrentPosition(); //stopPosition is an int videoView.pause(); } @Override public void onResume() { super.onResume(); Log.d(TAG, “onResume called”); videoView.seekTo(stopPosition); videoView.start(); //Or use resume() if it doesn’t work. I’m not sure } original post

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