JavaFx文本字段未在GUI上更新 [英] JavaFx Text fields are not updating on GUI
问题描述
我正在尝试对内存可视化器进行编码，该内存可视化器将使用当前内存统计信息更新图形，并在其侧面具有数字表示。我有一个在线程中运行的更新方法，应该每秒更新一次。
I am trying to code a memory visualizer that will update a graph with current memory statistics and have a numerical representation just to the side of it. I have an update method that runs in a thread and should update every second.
问题是它没有在GUI上更新，事实上我相信代码在一次迭代后停止。我相信它与一些setText（）调用有关，因为如果我将它们注释掉，那么至少图表会更新。
The issue is that none of it updates on the GUI, and in fact I believe the code stops after one iteration. I believe it has to do with some of the setText() calls because if I comment them out, then at least the graph will update.
这是我的初始化方法
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
assert memUsage_lineChart != null : "fx:id=\"memUsage_lineChart\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_totalMem != null : "fx:id=\"text_totalMem\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_usedMem != null : "fx:id=\"text_usedMem\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_availableMem != null : "fx:id=\"text_availableMem\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_percentageUsed != null : "fx:id=\"text_percentageUsed\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_totalRuntime != null : "fx:id=\"text_totalRuntime\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_threadsUsed != null : "fx:id=\"text_threadsUsed\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_version != null : "fx:id=\"text_version\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_timeAtMaxMem != null : "fx:id=\"text_timeAtMaxMem\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_maxMemReached != null : "fx:id=\"text_maxMemReached\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_timeOfLastAssociation != null : "fx:id=\"text_timeOfLastAssociation\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert text_something != null : "fx:id=\"text_totalRuntime\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert lineChart_yAxis != null : "fx:id=\"lineChart_yAxis\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
assert lineChart_xAxis != null : "fx:id=\"lineChart_xAxis\" was not injected: check your FXML file 'MemoryVisualization.fxml'.";
runtime = 0L;
//Initializing the ArrayLists<> that will contain the series of data for each possible graph
memData = new ArrayList<XYChart.Series<Number,Number>>();
//Setting the Y-axis of the chart to change according to incoming data.
memUsage_lineChart.getYAxis().setAutoRanging(true);
//Initializes the data arrays and series for the charts
XYChart.Series<Number, Number> series_sec = new XYChart.Series<Number,Number>();
memUsage_lineChart.getData().add(series_sec);
memData.add(series_sec);
//Creates a thread that continuously runs and adds data points to the displays
ScheduledExecutorService ses = Executors.newScheduledThreadPool(1);
ses.scheduleWithFixedDelay(new Runnable() {
@Override
public void run() {
runtime += 1000;
updateData();
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}, 0, 500, TimeUnit.MILLISECONDS);
}/*END OF INSTANTIATION*/
这是我的updateData （）方法
And here is my updateData() method
public void updateData()
{
//Gathers the runtime memory data from the system
long maxFreeMemory = Runtime.getRuntime().maxMemory();
long usableFreeMemory= Runtime.getRuntime().maxMemory()
-Runtime.getRuntime().totalMemory()
+Runtime.getRuntime().freeMemory();
double usedPercent=(double)(Runtime.getRuntime().totalMemory()
-Runtime.getRuntime().freeMemory())/Runtime.getRuntime().maxMemory();
long usedMemory = (long)(usedPercent*maxFreeMemory);
maxFreeMemory /= 1000000;
usableFreeMemory /= 1000000;
usedMemory /= 1000000;
usedPercent *= 100;
DecimalFormat df = new DecimalFormat("0.00");
//Set the text values for the runtime statistics
text_totalMem.textProperty().set(String.valueOf(maxFreeMemory));
text_usedMem.textProperty().set(String.valueOf(usedMemory));
text_availableMem.textProperty().set(String.valueOf(usableFreeMemory));
text_percentageUsed.textProperty().set(df.format(usedPercent)+" %");
text_totalRuntime.textProperty().set((runtime/3600000)+":"+String.format("%02d",((runtime/60000)%60))+":"+String.format("%02d",((runtime%60000)/1000)));
text_threadsUsed.textProperty().set(String.valueOf(ManagementFactory.getThreadMXBean().getThreadCount()));
//Updates the axes of the real-time graphs/charts
if(runtime >= 120000 && (runtime % 12000) == 0)
{
lineChart_xAxis.setLowerBound(lineChart_xAxis.getLowerBound()+12);
lineChart_xAxis.setUpperBound(lineChart_xAxis.getUpperBound()+12);
for(int i=0; i<12; i++)
memData.get(0).getData().remove(0);
}
//Adds the data to the series to be placed on to the graphs/charts
memData.get(0).getData().add(new XYChart.Data<Number,Number>(runtime/1000,usedMemory));
}
有没有理由我的GUI卡住并且不会更新文本字段/图表什么时候运行？我知道一个事实是线程至少运行一次迭代，因为当GUI弹出时文本字段不是0（初始化）。
Is there a reason my GUI gets stuck and wont update the text fields/graph when this is run? I know for a fact that the thread runs at least one iteration since the text fields are not 0 (as initialized) when the GUI pops up.
推荐答案
使用 Platform.runLater（）在FX应用程序线程上执行 updateData（）方法。 （此外，我认为 Thread.sleep（...）是多余的，因为您使用的是预定的执行程序。）
Execute the updateData() method on the FX Application Thread using Platform.runLater(). (Additionally, I think the Thread.sleep(...) is redundant, since you are using a scheduled executor.)
ses.scheduleWithFixedDelay(new Runnable() {
@Override
public void run() {
runtime += 1000;
Platform.runLater(() -> updateData());
}
}, 0, 500, TimeUnit.MILLISECONDS);
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