I made a Handler and a Runnable to wait 2 seconds until an animation starts but if I will leave the application in this time or if i will open another Fragment it crashes with the exception fragment not attached to context because of Handler.
What can I do? I tried many solution from the web but nothing worked for me and no using the startoffset method of the animation isn't a solution.
Thanks for your help.
(If I leave the Handler and the Runnable out of the code it works fine)
Handler handler=new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
float dip = 20f;
Resources r = getResources();
float px = TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP,
dip,
r.getDisplayMetrics()
);
Animation outtoRight = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, 0,
Animation.RELATIVE_TO_PARENT, 0,
Animation.RELATIVE_TO_PARENT, 0,
Animation.ABSOLUTE, -(willkommen.getHeight() + px));
outtoRight.setDuration(300);
outtoRight.setAnimationListener(new Animation.AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
}
#Override
public void onAnimationEnd(Animation animation) {
willkommen.setLayoutParams(params);
firstlaunchueberblick=true;
}
#Override
public void onAnimationRepeat(Animation animation) {
}
});
grid.startAnimation(outtoRight);
willkommen.startAnimation(outtoRight);
}
},2000);
That's my code inside the Fragment.
handler.removeCallbacks(myRunnable);
That's the solution. I read that i can also pass null as paramter to remove all Callbacks but that doesn't work;
Related
I have a small javafx application using scene builder which on a button click should read a string from COM port at regular intervals and update in a text field.
But now it only shows the last string if I use a for loop, and nothing if i put the code in infinite loop (That's my temporary requirement).
Can anyone help me so that at each read from COM port the new string is updated in the text field.
Here is the code I used for both the cases :
Note : In both cases in controller class, I'm getting perfect output on console.
public class Main extends Application
{
#Override
public void start(Stage primaryStage)
{
try
{
Parent root = FXMLLoader.load(getClass().getResource("test.fxml"));
Scene scene = new Scene(root);
//scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
primaryStage.setTitle("test");
primaryStage.setScene(scene);
primaryStage.show();
}
catch(Exception e)
{
e.printStackTrace();
}
}
public static void main(String[] args)
{
launch(args);
}
}
Here is the Controller class :
// In this case it shows only the last string in the text field.
public class Controller implements Initializable
{
#FXML
private Button sayHelloButton;
#FXML
private TextField helloField;
#Override
public void initialize(URL arg0, ResourceBundle arg1)
{
}
#FXML
public void printHello(ActionEvent event)
{
if(event.getSource() == sayHelloButton)
{
SerialPort serialPort = new SerialPort("COM22");
for(int i=0;i<5;i++)
{
try
{
if(!serialPort.isOpened())
{
serialPort.openPort();
serialPort.setParams(9600, 8, 1, 0);
}
String str = serialPort.readString(10,3000);
System.out.println(str);
helloField.clear();
helloField.setText(str);
}
catch(Exception e)
{
helloField.setText(e.toString());
}
}
}
}
}
Here is the method with infinite loop :
//this shows nothing in the text field
#FXML
public void printHello(ActionEvent event)
{
if(event.getSource() == sayHelloButton)
{
SerialPort serialPort = new SerialPort("COM22");
while(true)
{
try
{
if(!serialPort.isOpened())
{
serialPort.openPort();
serialPort.setParams(9600, 8, 1, 0);
}
String str = serialPort.readString(10,3000);
System.out.println(str);
helloField.clear();
helloField.setText(str);
}
catch(Exception e)
{
helloField.setText(e.toString());
}
}
}
}
There are a couple things happening here. In your first example, you state that the console output is correct but the TextField only shows the last result.
This is expected if the loop executes quickly. The TextField is being updated, but it happens so quickly that you can't see it until the loop ends and the last result is still being displayed. Even if you have a delay built into the loop, this could still block the UI from being updated until the loop is completed.
With your infinite loop, the issue is that the loop is being run on the JavaFX Application Thread (JFXAT). This blocks any updates to the GUI until the loop is finished, which is never is.
You will need to move the infinite loop to a new background thread. From there, you can update the GUI using the Platform.runLater() method.
SerialPort serialPort = new SerialPort("COM22");
new Thread(() -> {
while(true)
{
try
{
if(!serialPort.isOpened())
{
serialPort.openPort();
serialPort.setParams(9600, 8, 1, 0);
}
String str = serialPort.readString(10,3000);
System.out.println(str);
// Update the UI on the JavaFX Application Thread
Platform.runLater(() -> {
helloField.clear();
helloField.setText(str);
});
}
catch(Exception e)
{
Platform.runLater(() -> helloField.setText(e.toString()));
}
}
}).start();
This allows your UI to continually update as the background thread sends it new information.
Do you know how to wait for the user's input in a for loop? I don't mean the showAndWait() method, because I am not opening a new dialogue stage for the user. So for example, each round of the for loop should be waiting for the user to push a button before going ahead with the next round.
How is it possible? Many thanks!
UPDATE:
Now it came to my mind, that it would work with a while(buttonNotPressed){} but is it a good solution? I mean the while loop is running in this case as crazy until the user won't push the button. Or doest it work somehow similarly with wait methods?
Imagine it as a session:
User starts session with handleStart() You give the user 5 questions, one after one. In every iteration, the user can answer the upcoming question and he can save or submit the answer by handleSaveButton() You process the answer as you want, and go ahead with the next iteration. The point is, that the iteration must stop, until the save button hasn't been pressed.
Don't do it like that. The FX toolkit, like any event-driven GUI toolkit, already implements a loop for the purposes of rendering the scene graph and processing user input each iteration.
Just register a listener with the button, and do whatever you need to do when the button is pressed:
button.setOnAction(event -> {
// your code here...
});
If you want the action to change, just change the state of some variable each time the action is performed:
private int round = 0 ;
// ...
button.setOnAction(event -> {
if (round < 5) {
System.out.println("Round "+round);
System.out.println("User's input: "+textArea.getText());
round++ ;
}
});
I recently ran into a similar problem where I wanted something to be executed with an interval (if that's what you mean), until the user fired an event. I found 3 ways to do this:
UPDATE
You should use the stop/cancel method for the custom runnable and timer or else the thread will still be running when you exit the application. Timeline seems do it by itself.
Using a Timer:
Timer timer = new Timer();
TimerTask task = new TimerTask() {
#Override
public void run() {
System.out.println("Printed every second.");
}
};
timer.scheduleAtFixedRate(task, 0, 1000);
//timer.cancel();
With a TimeLine:
Timeline tl = new Timeline(new KeyFrame(Duration.millis(1000), e -> {
System.out.println("Timeline");
}));
tl.setCycleCount(Timeline.INDEFINITE);
tl.play();
//tl.stop();
Or making your own runnable class:
public class Runner implements Runnable {
private final Thread thread = new Thread(this);
private boolean run;
#Override
public void run() {
while(run) {
try {
System.out.println("Printed from loop");
Thread.sleep(1000);
} catch (InterruptedException e) {
run = false;
}
}
}
public void start() {
run = true;
thread.start();
}
public void stop() {
if(run) {
thread.interrupt();
System.out.print("Thread has stopped.");
}
}
}
And then when a person clicks fx. a button the event would stop using the example James_D posted:
Button btn = new Button("Button");
btn.setOnAction(e -> {
timer.cancel();
tl.stop();
runner.stop();
});
In my case, for inside for, had to create 2 index in class, use:
//start method
Timer timer = new Timer();
TimerTask task = new TimerTask()
{
public void run()
{
Platform.runLater(()->{
//... code to run after time, calling the same mehtod, with condition to stop
});
}
};
timer.schedule(task, time);
//end method
Had to use recursive method, incrementing the index with conditions, cause the tasks were been schedule all at the same time, without wait time.
I do not know if it is rigth, but was the solution that i found.
Hope it helps.
ALTERNATIVE SOLUTION W/O PAUSING:
I'm creating a game where I want the user to pick the game difficulty before the game starts. Instead of trying to pause the program midway through, I just put the next step of the code in a separate method which you call once a button is clicked:
private static difficulty;
public static void main(String[] args) {
try {
Application.launch(args);
} catch (UnsupportedOperationException e) {
}
}
public void start(Stage startStage) {
HBox buttons = new HBox();
Button easyButton = new Button("Easy");
Button mediumButton = new Button("Medium");
Button hardButton = new Button("Hard");
buttons.getChildren().addAll(easyButton, mediumButton, hardButton);
buttons.setAlignment(Pos.CENTER);
hbox.getChildren().addAll(buttons);
Scene startScene = new Scene(buttons, 200, 200);
startStage.setScene(startScene);
startStage.show(); // MENU
EventHandler<ActionEvent> playEasy = new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent actionEvent) {
difficulty = 1; // SET DIFFICULTY
startStage.close(); // CLOSE MENU
play(); // RUN GAME ON EASY
}
};
EventHandler<ActionEvent> playMedium = new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent actionEvent) {
difficulty = 2; // SET DIFFICULTY
startStage.close(); // CLOSE MENU
play(); // RUN GAME ON MEDIUM
}
};
EventHandler<ActionEvent> playHard = new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent actionEvent) {
difficulty = 3; // SET DIFFICULTY
startStage.close(); // CLOSE MENU
play(); // RUN GAME ON HARD
}
};
easyButton.setOnAction(playEasy);
mediumButton.setOnAction(playMedium);
hardButton.setOnAction(playHard);
}
public void play() {
// WRITE GAME CODE HERE
}
To solve your specific problem, you could probably pass the startStage into the play method and then just update the scene there...but regardless I do hope this helps someone whos having trouble on how to use buttons! :)
I am working on creating a small game.
I use scene switching (scene with a main game's screen and scene with some Help information). So, I decided to use HashMap scenes and set all scenes there. And clicking the button "Help" causes the scene switching.
But I have an issue. I want to stop all animations on non-active scene and currently I just set scene as NULL. I know that it is very bad realization.
Could somebody help me and also explain how to pause or stop all animations on scene?
Setting scene on primaryStage:
public static void setSceneToStage(String sceneId, Stage stage) {
SceneCollection.instance().clearCurrentActiveScene();
SceneCollection.instance().setNewActiveScene(sceneId);
stage.setScene(SceneCollection.instance().getScene(sceneId));
stage.setTitle(sceneId);
}
Clearing non-active scene:
public void clearCurrentActiveScene() {
if(activeScene != null) {
scenes.get(activeScene).clearScene();
}
}
public void clearScene() {
scene = null;
}
Initialize new scene:
public void setNewActiveScene(String sceneId) {
activeScene = sceneId;
scenes.get(sceneId).init();
}
public void init() {
scene = new Scene(new Pane(), 300, 300);
}
I think your program has to have a structure that you can have access to all transitions at time, for example you can have ''TransitonManager Class'' and in that class you have a arraylist of transitions and then you can add this transitions to that in their constructors and then when ever you want , you can have access to all transitions and stop them.
class TransitionManger{
public static ArrayList<Transition> transitions = new ArrayList<>();
}
class CustomTransition extends Transition{
CustomTransition(){
TransitionManger.transitions.add(this);
}
#Override
protected void interpolate(double v) {
//todo do what you want
}
}
you can also use singleton design pattern for TransitionManger for better encapsulation.
Since I couldn't find any specific place to discuss this, I thought I'd post here...
I'm using graphstream 1.1 (http://graphstream-project.org/), a graph visualization library for java, to develop a data visualization tool. I'm needing to retrieve mouseclicks on nodes to display related data, but after following the library tutorial, it's still not clear for me how to do this. Does anyone that used this could help me out here with a more straightfoward answer? The tutorial I'm following is at:
http://graphstream-project.org/doc/Tutorials/Graph-Visualisation_1.0/#retrieving-mouse-clicks-on-the-viewer
public class Clicks implements ViewerListener {
protected boolean loop;
public static void main(String args[]) {
new Clicks();
}
public Clicks() {
// We do as usual to display a graph. This
// connect the graph outputs to the viewer.
// The viewer is a sink of the graph.
Graph graph = new SingleGraph("Clicks");
Viewer viewer = graph.display();
// The default action when closing the view is to quit
// the program.
viewer.setCloseFramePolicy(Viewer.CloseFramePolicy.HIDE_ONLY);
// We connect back the viewer to the graph,
// the graph becomes a sink for the viewer.
// We also install us as a viewer listener to
// intercept the graphic events.
ViewerPipe fromViewer = viewer.newViewerPipe();
fromViewer.addViewerListener(this);
fromViewer.addSink(graph);
// Then we need a loop to wait for events.
// In this loop we will need to call the
// pump() method to copy back events that have
// already occured in the viewer thread inside
// our thread.
while(loop) {
fromViewer.pump();
}
}
viewClosed(String id) {
loop = false;
}
buttonPushed(String id) {
System.out.println("Button pushed on node "+id);
}
buttonReleased(String id) {
System.out.println("Button released on node "+id);
}
}
Just got it solved! I sent an e-mail to their mailing group. The tutorial code on the website was lacking some information. Those three functions need to be public void, and other 'imports' must be added:
import org.graphstream.ui.swingViewer.Viewer;
import org.graphstream.ui.swingViewer.ViewerListener;
import org.graphstream.ui.swingViewer.ViewerPipe;
Here a simple code to show you how to add click event to the nodes of a given graph in graphstream library. This code show how you can change the node's background by clicking on it. The colors are choosen randomly:
public class TutoMouseClicked{
Graph graph;
public TutoMouseClicked(){
}
public void run(){
//Build a simple graph with one node
graph = new SingleGraph("TutoMouseClicked", false, true);
graph.setAttribute("ui.quality");
graph.setAttribute("ui.antialias");
Node n1 = graph.addNode("n1");
n1.setAttribute("ui.style", "size: 100px;");
Viewer viewer = graph.display();
viewer.getDefaultView().setMouseManager(new TutoMouseManage());
}
public static void main(String args[]) {
new TutoMouseClicked().run();
}
}
And the class TutoMouseManage that implements MouseManager interface:
public class TutoMouseManage implements MouseManager{
/**
* The view this manager operates upon.
*/
protected View view;
/**
* The graph to modify according to the view actions.
*/
protected GraphicGraph graph;
protected GraphicElement element;
#Override
public void init(GraphicGraph gg, View view) {
this.graph = gg;
this.view = view;
view.addMouseListener(this);
view.addMouseMotionListener(this);
}
#Override
public void release() {
view.removeMouseListener(this);
view.removeMouseMotionListener(this);
}
#Override
public void mouseClicked(MouseEvent me) {
element = view.findNodeOrSpriteAt(me.getX(), me.getY());
if(element != null){
Random r = new Random();
element.setAttribute("ui.style", "fill-color: rgb("+r.nextInt(256)+","+r.nextInt(256)+","+r.nextInt(256)+");");
}
}
#Override
public void mousePressed(MouseEvent me) {
}
#Override
public void mouseReleased(MouseEvent me) {
}
#Override
public void mouseEntered(MouseEvent me) {
}
#Override
public void mouseExited(MouseEvent me) {
}
#Override
public void mouseDragged(MouseEvent me) {
}
#Override
public void mouseMoved(MouseEvent me) {
}
}
you can adapt this code to get what you need, add any other mouse event you want: mouse released, mouse pressed, mouse dragged and all mouse events.
I want to know whether how to capture the button clicked with AspectJ and get its parameter (eg. button name). I think for having more generalized capturing with AspectJ, it shoudl be used MouseListener so it can capture other UI elements in general!
Example:
In a GUI example I have defined 2 buttons that take some actions
public JButton btn1 = new JButton("Test1");
public JButton btn2 = new JButton("Test2");
btn1.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
//take some actions
}
}
btn2.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
//take some actions
}
}
How to capture these buttons with AspectJ, and get their parameters (eg. name)?
It is possible. I have provided two examples. The first that prints out for every JButton that has an ActionListener. The other example only prints out if a specific buttons is clicked.
Prints the text for every JButton clicked with an ActionListener:
#Pointcut("execution(* *.actionPerformed(*)) && args(actionEvent)")
public void buttonPointcut(ActionEvent actionEvent) {}
#Before("buttonPointcut(actionEvent)")
public void beforeButtonPointcut(ActionEvent actionEvent) {
if (actionEvent.getSource() instanceof JButton) {
JButton clickedButton = (JButton) actionEvent.getSource();
System.out.println("Button name: " + clickedButton.getText());
}
}
Prints the text for a specific JButton:
public static JButton j1;
#Pointcut("execution(* *.actionPerformed(*)) && args(actionEvent) && if()")
public static boolean button1Pointcut(ActionEvent actionEvent) {
return (actionEvent.getSource() == j1);
}
#Before("button1Pointcut(actionEvent)")
public void beforeButton1Pointcut(ActionEvent actionEvent) {
// logic before the actionPerformed() method is executed for the j1 button..
}
UPDATED:
You can do this in many different ways. For example add your buttons to the aspect directly. But I prefere to use a enum object between (ButtonManager in this case), so the code does not know about the aspect. And since the ButtonManager is an enum object, it is easy for the aspect to retrieve values from it.
I just tested it with a Swing button class from Oracle and it works. In the Swing class:
b1 = new JButton("Disable middle button", leftButtonIcon);
ButtonManager.addJButton(b1);
AspectJ is extremely powerful when it comes to manipulating classes, but it can not weave advises into specific objects since objects is not created at the time of weaving. So you can only work with objects at runtime and that is why I have added the addJButton(..) method above. That enables the aspect to check the advised button against a list of registered buttons.
The ButtonManager class:
public enum ButtonManager {
;
private static Collection<JButton> buttonList = new LinkedList<JButton>();
public static void addJButton(JButton jButton) {
buttonList.add(jButton);
}
public static Collection<JButton> getButtonList() {
return buttonList;
}
}
Modified pointcut and advice to only print the name of the buttons registered in the ButtonManager:
#Pointcut("execution(* *.actionPerformed(*)) && args(actionEvent) && if()")
public static boolean buttonListPointcut(ActionEvent actionEvent) {
Collection<JButton> buttonList = ButtonManager.getButtonList();
JButton registeredButton = null;
for (JButton jButton : buttonList) {
if (actionEvent.getSource() == jButton) {
registeredButton = jButton;
}
}
return registeredButton != null;
}
#Before("buttonListPointcut(actionEvent)")
public void beforeButtonListPointcut(ActionEvent actionEvent) {
JButton clickedButton = (JButton) actionEvent.getSource();
System.out.println("Registered button name: " + clickedButton.getText());
}
UPDATED 2
Okay, I believe I understand what you want. You want to listen to mouse events. That is possible. The downside is that you have to register all your GUI components that you want to listen for clicks with a mouse listener. It is not enough to register the JPanel of the JFrame with a MouseListener. So if you only have registered an ActionListener for your buttons, you also have to add a mouse listener.
I have created a quick solution that works for me. It only shows that it works. I have not tried to make the solution generic with many different GUI objects. But that should be quite easy to refactor in when you have got the basics to work.
In the Swing class:
private class MouseListener extends MouseInputAdapter {
public void mouseClicked(MouseEvent e) {}
}
In the init method of the Swing class:
MouseListener myListener = new MouseListener();
btn1.addMouseListener(myListener);
btn2.addMouseListener(myListener);
In the Aspect class:
#Pointcut("execution(* *.mouseClicked(*)) && args(mouseEvent)")
public void mouseEventPointcut(MouseEvent mouseEvent) {}
#Before("mouseEventPointcut(mouseEvent)")
public void beforeMouseEventPointcut(MouseEvent mouseEvent) {
if (mouseEvent.getSource() instanceof JButton) {
JButton clickedButton = (JButton) mouseEvent.getSource();
System.out.println("aspectJ --> mouseClicked: " + clickedButton.getText());
}
}
This results in the following output in the console:
aspectJ --> mouseClicked: Test1
I hope it helps!