javaFX controllers doesn't communicate which each other -
i have problem javafx.i'm doing calculator , divide app between 3 fxml files(1 controller controlls numbers , operators, 2 controller textfield result field, , last 1 should let them communicate each other).
i can not manage how can write own method example put number "3" when press number 3 in textfield-which in other fxml , has own fxml file.there nullpointer exception suppose im not initializing textfield.please me problem.is there way write own method(in example wrote showdigit()) in maincontroller class - method should set text textfield after pressing button - example button 2 put "2" in textfield.
below i've pasted code.
package pl.calculator.controller; import java.net.url; import java.util.resourcebundle; import javafx.event.actionevent; import javafx.event.eventhandler; import javafx.fxml.fxml; import javafx.fxml.initializable; import javafx.scene.control.button; import javafx.scene.control.textfield; public class mainpanecontroller implements initializable { @fxml private textpanecontroller textpanecontroller; @fxml private calculatorpanecontroller calculatorpanecontroller; @override public void initialize(url location, resourcebundle resources) { /*calculatorpanecontroller.getbuttonzero().setonaction(new eventhandler<actionevent>() { @override public void handle(actionevent event) { textpanecontroller.gettextfieldexpression().settext("example"); } });*/ --- < works } } fxml maincontroller
<?xml version="1.0" encoding="utf-8"?> <?import java.lang.*?> <?import javafx.scene.layout.*?> <?import javafx.scene.layout.anchorpane?> <vbox xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="pl.calculator.controller.mainpanecontroller"> <children> <fx:include fx:id="textpane" source="textpane.fxml" /> <fx:include fx:id="calculatorpane" source="calculatorpane.fxml" /> </children> </vbox> number , operation controller:
import java.net.url; import java.util.resourcebundle; import javafx.event.actionevent; import javafx.fxml.fxml; import javafx.fxml.initializable; import javafx.scene.control.button; import javafx.scene.control.textfield; import javafx.scene.layout.gridpane; public class calculatorpanecontroller implements initializable { @fxml private button buttonfour; @fxml private button buttonsix; @fxml private button buttondivide; @fxml private button buttonone; @fxml private button buttonclosebracket; @fxml private button buttondot; @fxml private button buttonclear; @fxml private button buttontwo; @fxml private button buttonseven; @fxml private button buttonopenbracket; @fxml private button buttonthree; @fxml private button buttonmultiply; @fxml private button buttonsubtract; @fxml private button buttoneight; @fxml private button buttonequal; @fxml private button buttonnine; @fxml private button buttonzero; @fxml private button buttonmemory; @fxml private button buttonfive; @fxml private gridpane gridpane; @fxml private button buttonadd; @fxml private textpanecontroller textpanecontroller; @fxml private calculatorpanecontroller calculatorpanecontroller; @override public void initialize(url location, resourcebundle resources) { } @fxml private void showdigit(actionevent event) { textpanecontroller.gettextfieldexpression().settext("s"); } <---------this 1 doesnt work public button getbuttonfour() { return buttonfour; } public void setbuttonfour(button buttonfour) { this.buttonfour = buttonfour; } public button getbuttonsix() { return buttonsix; } public void setbuttonsix(button buttonsix) { this.buttonsix = buttonsix; } public button getbuttondivide() { return buttondivide; } public void setbuttondivide(button buttondivide) { this.buttondivide = buttondivide; } public button getbuttonone() { return buttonone; } public void setbuttonone(button buttonone) { this.buttonone = buttonone; } public button getbuttonclosebracket() { return buttonclosebracket; } public void setbuttonclosebracket(button buttonclosebracket) { this.buttonclosebracket = buttonclosebracket; } public button getbuttondot() { return buttondot; } public void setbuttondot(button buttondot) { this.buttondot = buttondot; } public button getbuttonclear() { return buttonclear; } public void setbuttonclear(button buttonclear) { this.buttonclear = buttonclear; } public button getbuttontwo() { return buttontwo; } public void setbuttontwo(button buttontwo) { this.buttontwo = buttontwo; } public button getbuttonseven() { return buttonseven; } public void setbuttonseven(button buttonseven) { this.buttonseven = buttonseven; } public button getbuttonopenbracket() { return buttonopenbracket; } public void setbuttonopenbracket(button buttonopenbracket) { this.buttonopenbracket = buttonopenbracket; } public button getbuttonthree() { return buttonthree; } public void setbuttonthree(button buttonthree) { this.buttonthree = buttonthree; } public button getbuttonmultiply() { return buttonmultiply; } public void setbuttonmultiply(button buttonmultiply) { this.buttonmultiply = buttonmultiply; } public button getbuttonsubtract() { return buttonsubtract; } public void setbuttonsubtract(button buttonsubtract) { this.buttonsubtract = buttonsubtract; } public button getbuttoneight() { return buttoneight; } public void setbuttoneight(button buttoneight) { this.buttoneight = buttoneight; } public button getbuttonequal() { return buttonequal; } public void setbuttonequal(button buttonequal) { this.buttonequal = buttonequal; } public button getbuttonnine() { return buttonnine; } public void setbuttonnine(button buttonnine) { this.buttonnine = buttonnine; } public button getbuttonzero() { return buttonzero; } public void setbuttonzero(button buttonzero) { this.buttonzero = buttonzero; } public button getbuttonmemory() { return buttonmemory; } public void setbuttonmemory(button buttonmemory) { this.buttonmemory = buttonmemory; } public button getbuttonfive() { return buttonfive; } public void setbuttonfive(button buttonfive) { this.buttonfive = buttonfive; } public gridpane getgridpane() { return gridpane; } public void setgridpane(gridpane gridpane) { this.gridpane = gridpane; } public button getbuttonadd() { return buttonadd; } public void setbuttonadd(button buttonadd) { this.buttonadd = buttonadd; } } fxml operation , number controller:
<?import java.lang.*?> <?import javafx.geometry.*?> <?import javafx.scene.control.*?> <?import javafx.scene.layout.*?> <gridpane fx:id="gridpane" prefheight="308.0" prefwidth="375.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="pl.calculator.controller.calculatorpanecontroller"> <children> <button fx:id="buttonone" minheight="40.0" minwidth="40.0" mnemonicparsing="false" onaction="#showdigit" text="1" /> <button fx:id="buttonfour" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="4" gridpane.rowindex="1" /> <button fx:id="buttontwo" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="2" gridpane.columnindex="1" /> <button fx:id="buttonseven" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="7" gridpane.rowindex="2" /> <button fx:id="buttonfive" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="5" gridpane.columnindex="1" gridpane.rowindex="1" /> <button fx:id="buttoneight" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="8" gridpane.columnindex="1" gridpane.rowindex="2" /> <button fx:id="buttonthree" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="3" gridpane.columnindex="2" /> <button fx:id="buttonsix" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="6" gridpane.columnindex="2" gridpane.rowindex="1" /> <button fx:id="buttonnine" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="9" gridpane.columnindex="2" gridpane.rowindex="2" /> <button fx:id="buttonzero" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="0" gridpane.rowindex="3" /> <button fx:id="buttondot" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="." gridpane.columnindex="1" gridpane.rowindex="3" /> <button fx:id="buttonequal" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="=" gridpane.columnindex="2" gridpane.rowindex="3" /> <button fx:id="buttondivide" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="/" gridpane.columnindex="3" gridpane.rowindex="2" /> <button fx:id="buttonmultiply" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="*" gridpane.columnindex="3" gridpane.rowindex="3" /> <button fx:id="buttonsubtract" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="-" gridpane.columnindex="3" gridpane.rowindex="1" /> <button fx:id="buttonadd" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="+" gridpane.columnindex="3" /> <button fx:id="buttonclosebracket" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text=")" gridpane.columnindex="4" gridpane.rowindex="3" /> <button fx:id="buttonopenbracket" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="(" gridpane.columnindex="4" gridpane.rowindex="2" /> <button fx:id="buttonmemory" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="m" gridpane.columnindex="4" /> <button fx:id="buttonclear" minheight="40.0" minwidth="40.0" mnemonicparsing="false" text="c" gridpane.columnindex="4" gridpane.rowindex="1" /> </children> <columnconstraints> <columnconstraints hgrow="sometimes" minwidth="10.0" prefwidth="100.0" /> <columnconstraints hgrow="sometimes" minwidth="10.0" prefwidth="100.0" /> <columnconstraints hgrow="sometimes" minwidth="10.0" prefwidth="100.0" /> <columnconstraints hgrow="sometimes" minwidth="10.0" prefwidth="100.0" /> <columnconstraints hgrow="sometimes" minwidth="10.0" prefwidth="100.0" /> </columnconstraints> <rowconstraints> <rowconstraints minheight="10.0" prefheight="30.0" vgrow="sometimes" /> <rowconstraints minheight="10.0" prefheight="30.0" vgrow="sometimes" /> <rowconstraints minheight="10.0" prefheight="30.0" vgrow="sometimes" /> <rowconstraints minheight="10.0" prefheight="30.0" vgrow="sometimes" /> </rowconstraints> </gridpane> controller textfields(results)
import java.net.url; import java.util.resourcebundle; import javafx.fxml.fxml; import javafx.fxml.initializable; import javafx.scene.control.label; import javafx.scene.control.textfield; public class textpanecontroller { @fxml private label labelexpression; @fxml private textfield textfieldonp; @fxml private label labelonp; @fxml private textfield textfieldexpression; public label getlabelexpression() { return labelexpression; } public void setlableexpression(label lableexpression) { this.labelexpression = lableexpression; } public textfield gettextfieldonp() { return textfieldonp; } public void settextfieldonp(textfield textfieldonp) { this.textfieldonp = textfieldonp; } public label getlabelonp() { return labelonp; } public void setlabelonp(label labelonp) { this.labelonp = labelonp; } public textfield gettextfieldexpression() { return textfieldexpression; } public void settextfieldexpression(textfield textfieldexpression) { this.textfieldexpression = textfieldexpression; } } fxml file text:
<?import javafx.geometry.*?> <?import javafx.scene.control.*?> <?import java.lang.*?> <?import javafx.scene.layout.*?> <?import javafx.scene.layout.anchorpane?> <anchorpane maxheight="-infinity" maxwidth="-infinity" minheight="-infinity" minwidth="-infinity" prefheight="89.0" prefwidth="349.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="pl.calculator.controller.textpanecontroller"> <children> <label fx:id="lableexpression" layoutx="21.0" layouty="14.0" text="wprowadź wyrażenie:" /> <label fx:id="labelonp" layoutx="213.0" layouty="14.0" text="wyrażenie onp" /> <textfield fx:id="textfieldexpression" layoutx="5.0" layouty="45.0" /> <textfield fx:id="textfieldonp" editable="false" layoutx="180.0" layouty="45.0" /> </children> </anchorpane> and stack trace:
textfield[id=textfieldexpression, styleclass=text-input text-field] exception in thread "javafx application thread" java.lang.runtimeexception: java.lang.reflect.invocationtargetexception @ javafx.fxml.fxmlloader$methodhandler.invoke(unknown source) @ javafx.fxml.fxmlloader$controllermethodeventhandler.handle(unknown source) @ com.sun.javafx.event.compositeeventhandler.dispatchbubblingevent(unknown source) @ com.sun.javafx.event.eventhandlermanager.dispatchbubblingevent(unknown source) @ com.sun.javafx.event.eventhandlermanager.dispatchbubblingevent(unknown source) @ com.sun.javafx.event.compositeeventdispatcher.dispatchbubblingevent(unknown source) @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(unknown source) @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(unknown source) @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(unknown source) @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(unknown source) @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(unknown source) @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(unknown source) @ com.sun.javafx.event.eventutil.fireeventimpl(unknown source) @ com.sun.javafx.event.eventutil.fireevent(unknown source) @ javafx.event.event.fireevent(unknown source) @ javafx.scene.node.fireevent(unknown source) @ javafx.scene.control.button.fire(unknown source) @ com.sun.javafx.scene.control.behavior.buttonbehavior.mousereleased(unknown source) @ com.sun.javafx.scene.control.skin.behaviorskinbase$1.handle(unknown source) @ com.sun.javafx.scene.control.skin.behaviorskinbase$1.handle(unknown source) @ com.sun.javafx.event.compositeeventhandler$normaleventhandlerrecord.handlebubblingevent(unknown source) @ com.sun.javafx.event.compositeeventhandler.dispatchbubblingevent(unknown source) @ com.sun.javafx.event.eventhandlermanager.dispatchbubblingevent(unknown source) @ com.sun.javafx.event.eventhandlermanager.dispatchbubblingevent(unknown source) @ com.sun.javafx.event.compositeeventdispatcher.dispatchbubblingevent(unknown source) @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(unknown source) @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(unknown source) @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(unknown source) @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(unknown source) @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(unknown source) @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(unknown source) @ com.sun.javafx.event.eventutil.fireeventimpl(unknown source) @ com.sun.javafx.event.eventutil.fireevent(unknown source) @ javafx.event.event.fireevent(unknown source) @ javafx.scene.scene$mousehandler.process(unknown source) @ javafx.scene.scene$mousehandler.access$1800(unknown source) @ javafx.scene.scene.impl_processmouseevent(unknown source) @ javafx.scene.scene$scenepeerlistener.mouseevent(unknown source) @ com.sun.javafx.tk.quantum.glassvieweventhandler$mouseeventnotification.run(unknown source) @ com.sun.javafx.tk.quantum.glassvieweventhandler$mouseeventnotification.run(unknown source) @ java.security.accesscontroller.doprivileged(native method) @ com.sun.javafx.tk.quantum.glassvieweventhandler.handlemouseevent(unknown source) @ com.sun.glass.ui.view.handlemouseevent(unknown source) @ com.sun.glass.ui.view.notifymouse(unknown source) @ com.sun.glass.ui.win.winapplication._runloop(native method) @ com.sun.glass.ui.win.winapplication.access$300(unknown source) @ com.sun.glass.ui.win.winapplication$4$1.run(unknown source) @ java.lang.thread.run(unknown source) caused by: java.lang.reflect.invocationtargetexception @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ sun.reflect.misc.trampoline.invoke(unknown source) @ sun.reflect.generatedmethodaccessor1.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ sun.reflect.misc.methodutil.invoke(unknown source) ... 48 more caused by: java.lang.nullpointerexception @ pl.calculator.controller.calculatorpanecontroller.showdigit(calculatorpanecontroller.java:89) ... 57 more
the fxml file calculatorpane.fxml doesn't have <fx:include fx:id="textpane" ... />, associated controller doesn't textpanecontroller injected it. textpanecontroller in calculatorpanecontroller null, , nullpointerexception.
a way update value calculatorpanecontroller give both controllers shared data model, , update model. like
public class datamodel { private final stringproperty text = new simplestringproperty(); public stringproperty textproperty() { return text ; } public final string gettext() { return textproperty().get(); } public final void settext(string text) { textproperty().set(text); } // other properties needed... } then controllers can do
public class textpanecontroller { private datamodel model ; @fxml private textfield textfieldexpression ; // etc ... public void setmodel(datamodel model) { this.model = model ; textfieldexpression.textproperty().bindbidirectional(model.textproperty()); } } and
public class calculatorpanecontroller { private datamodel model ; public void setmodel(datamodel model) { this.model = model ; } // ... @fxml private void showdigit(actionevent event) { model.settext("s"); } } finally, tie in main controller's initialize method:
public class mainpanecontroller implements initializable { @fxml private textpanecontroller textpanecontroller; @fxml private calculatorpanecontroller calculatorpanecontroller; @override public void initialize(url location, resourcebundle resources) { datamodel model = new datamodel(); textpanecontroller.setmodel(model); calculatorpanecontroller.setmodel(model); } } you don't need (and shouldn't have) get/set methods controls in controllers. should kept private , not exposed outside controller.
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