settext

I have an almost completely Vanilla App. All I'm trying to do is change the text of a textView, but it gives me a NullPointerException. I have no XML configuration, no added methods, nothing special. I checked my class, and it's pointing to the correct XML, and the XML does have a textView element in it with the correct id. I have also tried creating the textView instance outside of onCreate() on the class level, and the app just fails to start no matter what. I'm sure I'm overlooking simple, but I can't find the answer. Thanks for the help. EDIT: I realize that I need to move this code so

I try to show some text in my JTextArea in runtime. But when I use a loop of setText to show text in order, it only show the text of the last loop Here is my code: private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { for (int i=0;i<10;i++) jTextArea1.setText("Example "+i); } I want it to show "Example 1", "Example 2",..,"Example 9" . But it only show one time " Example 9 " Anyone can explain it for me?? setText does just that, it "sets the text" of field to the value your provide, removing all previous content. What you want is JTextArea#append If you're using Java 8, another

I'm developing an android application which contains an EditText . I control what is written in the editText by calling et.addTextChangedListener(new TextWatcher() { public void afterTextChanged(Editable s) { String message = et.getText().toString(); if(s.toString().compareTo(before)!=0){ et.setText(message); et.setSelection(et.getText().length()); } } public void beforeTextChanged(CharSequence s, int start, int count, int after) { before = et.getText().toString(); System.out.println("After"); } public void onTextChanged(CharSequence s, int start, int before, int count) { System.out.println(

Im trying to implement an activity that uses ExpandableListView and I have gotten so far but now I have found some strange behavior. My activity is meant to record food intake as specified by the user. they have a choice of menus (breakfast, lunch and dinner - the outer group) which expand to show their contents. when a user clicks on an inner menu item a dialog appears asking them for the qty. once they enter a qty and dismiss the dialog the text on the menu item changes to reflect the quantity of that item that has been consumed The above image shows the list in a closed state. below is the

I'm trying to make input nameField appear in a Label called label1 after a Button called button1 is clicked. Right now it says: 'txt' and I understand why. But I don't know how I can use the string! Can anyone explain me what I'm doing wrong and how to use this string properly? import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; public class thisismytest2 { public static void main(String[] args) { final

Following iOS 8 code is called every second: - (void)appendString(NSString *)newString toTextView:(UITextView *)textView { textView.scrollEnabled = NO; textView.text = [NSString stringWithFormat:@"%@%@%@", textView.text, newString, @"\n"]; textView.scrollEnabled = YES; [textView scrollRangeToVisible:NSMakeRange(textView.text.length, 0)]; } The goal is to have the same scrolling down behaviour as the XCode console when the text starts running off the bottom. Unfortunately, setText causes the view to reset to the top before I can scroll down again with scrollRangeToVisible. This was solved in

//search files and directories public void getFile1(String directoryName) throws Exception { File directory = new File(directoryName); String str = directory.getName(); File[] fList = directory.listFiles(); if (fList != null) { for (File file : fList) { { if (file.isFile()) { st = (file.toString()); System.out.println(st); jLable1.setText(st);//jLable1 is not updating. String fileName = file.getName(); String strvirusCount=Integer.toString(virusCount); } else if (file.isDirectory()) { getFile1(file.getAbsolutePath()); } globalCount++; } } //while retrieving all files and folder unable to

Hi first time here but here goes: I have a JavaFX application that changes the FXML UI labels dynamically and the data is pulled from a Player class. The two classes in question are Player.java and InterfaceHandler.java . The player class stores player details and I want to pass the details to the Interface class which sets the text on the labels. As a test my FXML UI just has a button and two labels. If it click the button it calls the handleButton method it sets locationLabel to "Town" fine. However if I call the locationLabel() method in my Player class I get a NullPointerException when