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问题 I have an app that needs to get user's attention when user exit the app at least once. So I get the code below to show a messagebox. What I don't know is how do I really exit the app if user has read the message? Because it seems the back key event will always come to the call I setup (OnBackKeyPress) Or what is a good way to handle showing a messagebox without messing around overriding BackKey? Because if have another pop up on screen and user pressed back key, it seems I got some exception

问题 Let's say I have 4 activities in my app: A (main activity) B C D I would like that pressing back in Activity A always produce application exit. In my case if activity flow goes like this A > B > C > A, then if I push back button, I will go to activity C. I want, at that moment, my app to exit. I assume, app should somehow delete activity history when main activity is active. How is this to be done? Thanks 回答1: When you launch your home activity do so with the clear top flag set. This causes

问题 Let's say I have 4 activities in my app: A (main activity) B C D I would like that pressing back in Activity A always produce application exit. In my case if activity flow goes like this A > B > C > A, then if I push back button, I will go to activity C. I want, at that moment, my app to exit. I assume, app should somehow delete activity history when main activity is active. How is this to be done? Thanks 回答1: When you launch your home activity do so with the clear top flag set. This causes

问题 I'm trying to implement a custom back button for every ViewController in my app. I want it to have two actions. If the button gets tapped , it should behave normally and go up the navigation stack. If the button gets pressed longer it should go to a predefined ViewController. How can I achieve this for only the backbutton in swift? 回答1: You can hide your default navigation back button and add a custom button this way: import UIKit class SViewController: UIViewController { override func

问题 I have a weird error that I cant figure out how to fix . I have a video player - a simple videoview that plays a video. Now I ve implemented logic so that when the user presses the back button - it tells him to press the back button again to exit, and when he does it exits. But the problem is the first back press is not caught! I dont know what is causing this. I Press back once nothing happens, I press again and it shows me the toast that says "Please press back again to exit" and on

问题 I am having difficulty getting the back button to actually finish my activity when pressed. I am running a very simple videoview, using a progressdialog to show loading dialog and onpreparedlistener, etc etc. simple stuff. Anyways, currently when I press the back button, it will just cancel the progressdialog, and leave a black screen, and pressed again, the progressdialog restarts!!! and then when I click the back button again, it displays an alert dialog, "video cannot be played." very

问题 How to remove Angular template cache once user clicks on logout? We did thorough research and tried to implement most of the solutions available out there. we tried following HTML Meta Tags <meta http-equiv="Cache-Control" content="no-cache" /> <meta http-equiv="Pragma" content="no-cache" /> <meta http-equiv="Expires" content="0" /> Server side res.setHeader('cache-control', 'no-cache', 'no-store', 'must-revalidate'); Javascript We tried to delete browser history as specified on this blog

问题 I have a LinearLayout View in my activity. When I press back button I want LinearLayout's children to slide out. I have the following code which doesn't do anything: private void SlideOut() { LayoutAnimationController controller = AnimationUtils.loadLayoutAnimation(this, R.anim.layout_animation_row_slide_out); Animation animation=controller.getAnimation(); animation.setFillAfter(true); LinearLayout menuLayout =((LinearLayout)findViewById(R.id.menuLayout)); menuLayout.setLayoutAnimation

问题 I have a LinearLayout View in my activity. When I press back button I want LinearLayout's children to slide out. I have the following code which doesn't do anything: private void SlideOut() { LayoutAnimationController controller = AnimationUtils.loadLayoutAnimation(this, R.anim.layout_animation_row_slide_out); Animation animation=controller.getAnimation(); animation.setFillAfter(true); LinearLayout menuLayout =((LinearLayout)findViewById(R.id.menuLayout)); menuLayout.setLayoutAnimation

问题 I was reading through a lot of topics today regarding this. However, all the solutions that I had seen, failed to be a solution for me. I am new in Android development. My problem is that I had two buttons in my main page - namely PlayGame and Help. The PlayGame onClicked() will direct the user to the "difficulty page" where the user can choose Easy, Medium or Hard mode. What I want is that when the user pressed the Android back button in the "difficulty page", it will go back to the main