settext | 易学教程

Settext causing text to flicker irratically

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问题 I'm making an app which establishes USB communication between an Arduino UNO R3 and an android tablet. Arduino board is sending data correctly and it is even being received by tablet correctly and when tried to display, the text does get printed but with a rather continuous flicker. class MyThread extends Thread { @Override public void run() { mCallback = new UsbSerialInterface.UsbReadCallback() { //Defining a Callback which triggers whenever data is read. @Override public void onReceivedData

JLabel on JPanel doesn't update when setText from another method

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问题 Thank you for your help. I'm a newbie trying something quite simple. I want to have a window (panel) with a text (JLabel) that changes every few seconds. The whole application is working perfectly except for the JLabel that is being updated (the text does change), but it doesn't show on the window (panel). The window keeps the same text from beginning to end even though I have checkpoints that tell me that the text of the JLabel is being updated and changing. I've looked for the same issue

Why isn't setText updating the JLabel?

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问题 I've checked on the other threads here and haven't found a solution. 1) The JFrame is setVisible(true). 2) What does this mean: "I wonder if your problem is a concurrency issue, that you are doing a long-running process on the Swing event thread and that this is preventing your label from updating its text." I read that somewhere else. 3) I haven't initialized multiple times the JPanel that contains the label. EDIT: 4) updateTurn is called from the JPanel that contains TrackingPanel (i.e.

Cant set text in TextView - android

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问题 I checked every topic on stack about textView. I have problems with changing my content in TextView control. public Dialog onCreateDialog(Bundle savedInstanceState) { // Use the Builder class for convenient dialog construction super.onCreate(savedInstanceState); AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); final ViewPager mViewPager; mViewPager = (ViewPager) getActivity().findViewById(R.id.pager); LayoutInflater inflater = getActivity().getLayoutInflater(); builder

I can't set text to a label

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问题 Basically what I want to do is to display a text on a label when a button is clicked and it gives me a NullPointerException. I am using JavaFX. Here's the code itself(I deleted some of it because I don't think it's needed): package controller; import java.sql.*; import javafx.event.*; import javafx.fxml.FXML; import javafx.scene.control.*; public class LoginController { @FXML private TextField user; @FXML private PasswordField password; @FXML private Button loginButton; @FXML private Button

TextView setText and setVisibility not working in fragment

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问题 I have ControllerFragment which has 3 child fragments. Children fragments change are provided in the tabLayout via ViewPager. Unsend Apple and Banana badge count are computable variable values. unSendAppleCountTxtView and unSendBananaCountTxtView are changed according to these variable values. My function is running main Thread. Tried methods: I have controlled null check and textView isn't null setUnSendAppleCount function is taken in these threads (runOnUIThread, new Handler(), new Handler

How would i store a number/string into R.string.xx?

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问题 with this code, my program just force close(error) ***public View x = findViewById(R.string.nfoname);*** @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.information); //edittext ***final EditText infoname=(EditText)findViewById(R.id.infoname);*** //clear,confirm Button clear = (Button)findViewById(R.id.buttonclear); Button confirm = (Button)findViewById(R.id.buttonconfirm); //clear button clear.setOnClickListener(new View

Undo in JTextField and setText

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问题 JTextField has an undo support out of box. It works fine for user interacion, but unfortunately if method setText(String str) is called, that results two UndoableEdits instead of one. So this code looks and feels fine but does not work: UndoManager undoManager = new UndoManager(); JTextField tf = new JTextField(); tf.setText("initial value"); tf.getDocument().addUndoableEditListener(undoManager); tf.setText("new value"); undoManager.undo(); System.out.println(tf.getText()); // Prints empty

How to setText for QPlainTextEdit?

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问题 Qt5's documentation doesn't mention that QPlainTextEdit has setText(QString) like QTextEdit does. But, I don't think it's impossible. The only way I found is to use QTextDocument which can has setPlainText(const QString& text) . So I have to do this: plain_text_edit->setDocument(text_document); The problem is text_document should be a pointer. Not like QTextEdit 's setText which can take a local variable as it's parameter. So, is there anyway to do setText like to QPlainTextEdit ? 回答1: It's

How can a textfield from fxml file be updated by setText in java file?

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I am looking to update text in a textfield based on some value. In order to make this sample simpler I have made my program smaller. The problem seems to be when I put top.setText("This is my new Text"); I looked at this: how to change the text of TextField in java fx 2 but the answer does not seem to make sense. I don't know why you'd initialize a textfield that has already been implemented. Regardless it did not work. I have also looked at: NullPointerException (JavaFX Label.setText()) This seems to be the closest to what I think is the issue, but when I did the following I get an error.