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问题 I was browsing thought GitHub today and noticed that the individual repository navigation doesn't use hash-bangs in the URL /#! or /# and the back button still works. How do you think they are accomplishing this? How does this affect search engine crawling from Googlebot? I know it looks for # in the url. I'm really quite curious as I know using /# is quite debatable. Here's an example: https://github.com/mirah/pindah Thanks! 回答1: They blogged about it a while back: https://github.com/blog

问题 I am now having an activity containing fragments [1] , [2] , [3] , [4] If pressing buttons , [3] , it can be redirected to [4] I would like to implement the back button as shown follow.. when pressing back at [4] , it return to [3] when pressing back at [3] , it return to [2] when pressing back at [1] , the activity finishes(); When it comes to the current implementation, it finish the activity instead of popping up the Fragment. Would you please tell me what I should do or keep in mind ?

问题 I got an Activity that when it starts, it loads an image from the internet. In an effort to save memory, when the Activity is left by the back button being pressed, I want the activity to dump all data, that is get rid of all the strings and images that are in it. I figured the best way to do this was to just kill the activity. Well, I can't seem to figure out the callback for when the Back button is pressed. So, I have been trying to use the onPause() and the onStop() callbacks for the task

问题 When the BACK button is pressed on the phone, I want to prevent a specific activity from returning to its previous one. Specifically, I have login and sign up screens, both start a new activity called HomeScreen when successful login/signup occurs. Once HomeScreen is started, I want to prevent the users from being able to return to the login or sign up screens by pressing the BACK key. I tried using Intent.FLAG_ACTIVITY_NO_HISTORY , but since the application has Facebook integration, when the

问题 When the BACK button is pressed on the phone, I want to prevent a specific activity from returning to its previous one. Specifically, I have login and sign up screens, both start a new activity called HomeScreen when successful login/signup occurs. Once HomeScreen is started, I want to prevent the users from being able to return to the login or sign up screens by pressing the BACK key. I tried using Intent.FLAG_ACTIVITY_NO_HISTORY , but since the application has Facebook integration, when the

问题 The title of this question kind of explains my question. How do I redirect the PHP page visitor back to their previous page with the header( "Location: URL of previous page" ); 回答1: try: header('Location: ' . $_SERVER['HTTP_REFERER']); Note that this may not work with secure pages (HTTPS) and it's a pretty bad idea overall as the header can be hijacked, sending the user to some other destination. The header may not even be sent by the browser. Ideally, you will want to either: Append the

问题 style/AppTheme: <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"> <item name="colorPrimary">@color/colorPrimary</item> <item name="colorPrimaryDark">@color/colorPrimaryDark</item> <item name="colorAccent">@color/colorAccent</item> <item name="android:windowBackground">@color/colorBackground</item> </style> style/ActivityCustomToolbarTheme: <style name="ActivityCustomToolbarTheme" parent="AppTheme"> <item name="windowActionBar">false</item> <item name="windowNoTitle">true<

问题 How can I handle a Up navigation like a Back navigation? Is there a method for the Up navigation like for the Back navigation ( onBackPressed() )? Or can I programm the finish() method, when I press the Up navigation? 回答1: Assuming by 'up navigation' you mean a tap on the app icon, you need to override onOptionsItemSelected() in your activity and handle it like so: @Override public boolean onOptionsItemSelected(MenuItem item) { // 'home' is the id for the icon click in the action bar (i.e. up

问题 I want to create a button which will run a previously ran function. ie i click buttonA to run Function A then click button B to run functionB i want to have a button which allows the user to go back to functionA by clicking a back button. i thought i could a global variable to hold previous statements but it would not work as every function ran would overwrite the stored statements. here is some psuodo code to kind of explain what i mean var globalvar; globalvar = functionA; function B { run

问题 I'm working on an Android application that starts from an activity that serves as the menu screen (I'll call this activity the menu activity). There is a button that moves the app to another activity where the user can enter their name (I'll call this activity the name activity), and then the app returns to the menu activity. After entering my name, (I have now gone like this: menu - name - menu) when I press the back button, it goes back to the name activity, with the name still present in