I have a listener on the whole app for the back button press event in android to override the default behaviour of back button(exit the app).
Also in some component i have override it too if i want the back button to be disabled or do something else.
The problem is when i open a react-native-picker, the picker stays on the screen ignoring the back button press.
I want it to first close (on the first back button press) and only then do what the higher component ordered to do when back button is pressed.
so i can't override the the higher component back button handling
i thought maybe to add the picker as a screen in the navigator and instead of planting it as a component, navigate to it, so it will be added to the stack navigator.
then by default it will first pop it of the stack when pressing back.
how can i add the picker component as a screen to navigate to, or is there a better way to do that?
By default the back behavior collapses or closes the picker on Android (depending on the mode you have chosen). You can see a working example here.
Related
I wanna make an application that has multiple screens (screen1, screen2, and screen3), and for navigating between screens I wanna use bottom navigation bar. I wanna make it like Instagram app that can navigate back to the previous screen when the back button is pressed. I have made an app with navbar but when I press the back button the application is closed directly even after I navigate to other screen.
Override the onBackPressed() method of your activity, and write back button logic on it.
I am developing a custom launcher/home-screen, thus I am able to hand home-press events.
Sometimes I want it to intercept Home-presses without affecting the visible activity-stack so to speak. When I press home, however, I get to the launcher stack I suppose, but what I want to do then is get back to the last visited activity stack that was shown right before I pressed home. How can I do that?
How can I retrieve and show the activity that was visible right before I pressed home?
I'm doing an appication under phonegap (more specific in android). How can I disable the home, menu and back buttons in the screen, the idea is when i press any of the buttons, show a verification dialog, if the answer is correct, close the app. When i assign the function button doesn't show the dialog
For the home menu remove the onCreateOptionsMenu() function and also you wouldn't need the onOptionsItemSelected() function, so to hide the menu remove these two.
For the back buttons there are two of them:
The hard button in device that navigates in the app until it hits the main activity then pops out of the app, can be controlled by overriding this method onBackPressed()
And the one in the action bar that navigates all inside the app itself but never pops the user out of the app, can be set by setDisplayHomeAsUpEnabled() which takes a Boolean true to make it working, false to disable it.
When keyboard is open, the icon of the back button is changed to indicate that clicking it will close the keyboard instead of going back.
Back button:
Close button:
Is there a way how to switch from the back icon to close icon programmatically without actually opening the keyboard? We are using a custom keyboard implementation and would like to have the similar behaviour to the native one.
I am very new developer for Android application so please ignore if there is some technical mistakes in my question.
I have five screen (Home, SR-1, SR-2,SR-3,SR-4 ) in my Android application and I can switch any screen at give time.
When we are pressing device back button it will take we to the previous screen where I was lastly.
But whenever I am pressing Home it will take me to landing screen If in this state I am pressing device back button I will take me to previous view but I want to remove this state maintenance.
(i.e. : When I am coming to Home and I pressed back button It will exit from my application)
Thank you
for each activity: you can add in AndroidManifest.xml
<activity android:name="nameofActivity"
android:noHistory="true"></activity>
From android pressing back button should exit the app :
Immediately after you start a new activity, using startActivity, make sure you call finish() so that the current activity is not stacked behind the new one.