visibility

问题 Could someone explain me, why is it possible to do the following in PHP, but, for example, not in C# or Java: Class A { protected $a = 'Howdy!'; } Class B extends A { public function howdy() { $created = new A(); echo $created->a; <----- This is legal due to per-class visibility } } $b = new B(); echo $b->howdy(); <----- Hence, no fatal error here This behavior seems to be specified here, but I can't understand the fundamental reason behind this (to my mind, one can't simply implement the per

问题 How can I create a new checkbox every time I click a button and how do I hide a check box? Also, why doesn't checkbox.setVisibility(View.Gone); work the same way textview.setVisibility(View.Gone) worked? 回答1: LinearLayout my_layout = (LinearLayout)findViewById(R.id.my_layout); button.setOnClickListener(new onClickListener(){ void onClick(){ CheckBox checkBox = new CheckBox(this); checkBox.setText(Str_Array[i]); my_layout.addView(checkBox); } }); 回答2: Create the checkbox in the layout and set

问题 I have Dialog Fragment implemented like this public class SessionExpiredFragment extends DialogFragment { public interface SessionExpiredFragmentListener { public void onCancelLoginProcessPressed(DialogFragment dialog); // validValues = true if fields are not empty and email is a valid // email, // else validValues = false; public void onOKLoginProcessPressed(DialogFragment dialog, boolean validValues); } SessionExpiredFragmentListener mListener; @Override public void onAttach(Activity

问题 I have problem with RadioButton in xamarin. I would like to make my RadioButtons visible but I don't know how to do this. My RadioButtons are invisible in my xml file. I would like to make them visible from code. I need this because I want to make a list of the last logon users and when I choose one he fill my boxes. But on start I dont have 3 users but only 1 so I need to hide not used RadioButtons. So how can I change property of my RadioButtons? 回答1: To make a radio button visible:

问题 I have a class with a fields called "a". In the class I have a method and in the list of arguments of this method I also have "a". So, which "a" I will see inside of the method? Will it be the field or it will be the argument of the method? public class myClass { private String a; // Method which sets the value of the field "a". public void setA(String a) { a = a; } } By the way, there is a similar situation. A method has some local (for method) variables whose names coincide with the names

问题 Is there any way to keep a JToolTip visible while mouse is over the component who owns it, or the tooltip itself? 回答1: have you try using setToolTipText() method. Here btnNext is JButton. btnNext.setToolTipText("Next"); ToolTipManager.sharedInstance().setDismissDelay(Integer.MAX_VALUE); 来源： https://stackoverflow.com/questions/13750104/how-keep-visible-tooltip-while-mouse-is-over-it

问题 This question already has an answer here : How to use binding in the ListBox’s Items to the ViewModel’s properties (1 answer) Closed last year . I am using WPF Prism.Mvvm. I have a navigation bar on the side containing a Listview bound to an Itemssource. Those Items contain an image and the content. Now my goal is to collapse the content of the item so that my navigation control only shows the icons. I have defined a Visibility binding, using this on some image outside of my Listview which

问题 In my application got one sidebar, which is holding this two component : <Grid x:Name="AF" Visibility="Visibility"> <betata:AForm Height="508" VerticalAlignment="Top"/> </Grid> <Grid x:Name="AN" Visibility="Collapsed"> <betata:ANav Height="508" VerticalAlignment="Top"/> </Grid> in the AForm got hyperlink button with this method : private void HyperlinkButton_Click(object sender, RoutedEventArgs e) { Visibility = Visibility.Collapsed; Sidebar sb = new Sidebar(); sb.AN.Visibility = Visibility

问题 I have a issue that reprodusing only on Android 5.1.1 and few devices on 5.1. On the rest of versions works fine. Recycler view have onClick listener whereI try to update View Visibility from GONE to VISIBLE or conversely. After clicking on item nothing changes on UI. Note: If I close (BackButton) Fragment and open once again - UI will be updated. Even after pressing back button I see that UI updating for few milliseconds before destroing. I tryed to notify all adapter, current item,

问题 I am coming back to writing code in Java after a long gap - most of my coding work over the past few years has been in PHP & JavaScript - and am discovering that I have to work harder to satisfy the Java compiler which is far more rigorous about issues such as variable scope and exception handling. A piece of code that caused me some trouble is shown below File file = new File(path, fname); FileOutputStream stream = null; try { stream = new FileOutputStream(file); stream.write(tosave.getBytes