sleep

问题 When i am using JavaFX, the sleep function won't work accordingly. Like in this code: public class Controller { @FXML private Label label; @FXML private Button b1; public void write() throws InterruptedException { label.setText("FIRST TIME"); for(int i=1;i<=5;i++) { System.out.println("Value "+i); label.setText("Value "+i); Thread.sleep(2000); } label.setText("LAST TIME"); } when the Button b1 is pressed the write function is called. Now, in the console "Value + i" is being printed after 2

问题 I am a bit confused with Thread.sleep() method. if Thread.sleep() is a static method, how does two threads know which is put to sleep. For example, in the code below, I have two three Threads main , t and t1 . I call Thread.sleep() always. Not t.sleep() . Does it mean Thread.sleep() puts the current Thread to sleep? That means a Thread instance puts to sleep by itself by calling the static method. what if t1 wants to put t to sleep. that shouldn't be possible correct? public class

问题 I am a bit confused with Thread.sleep() method. if Thread.sleep() is a static method, how does two threads know which is put to sleep. For example, in the code below, I have two three Threads main , t and t1 . I call Thread.sleep() always. Not t.sleep() . Does it mean Thread.sleep() puts the current Thread to sleep? That means a Thread instance puts to sleep by itself by calling the static method. what if t1 wants to put t to sleep. that shouldn't be possible correct? public class

问题 I want to show other image in ImageView within 3 second, after that rollover old image. The code: OnClickListener oc = new OnClickListener() { @Override public void onClick(View v) { ImageView iv = (ImageView)v; iv.setImageResource(img2_id); SystemClock.sleep(3000); iv.setImageResource(img1_id); } } myImageView.setOnClickListener(oc); But it doesn't work? So, am I doing something wrong? 回答1: You are blocking the UI thread. Thus during the sleep command, the screen won't refresh. What you need

问题 I want to show other image in ImageView within 3 second, after that rollover old image. The code: OnClickListener oc = new OnClickListener() { @Override public void onClick(View v) { ImageView iv = (ImageView)v; iv.setImageResource(img2_id); SystemClock.sleep(3000); iv.setImageResource(img1_id); } } myImageView.setOnClickListener(oc); But it doesn't work? So, am I doing something wrong? 回答1: You are blocking the UI thread. Thus during the sleep command, the screen won't refresh. What you need

问题 I was playing around with the time.sleep function from python's standard library and found it inadequate for sub-ms delays. From testing I found it to actually wait 1.1-1.2 ms for a 1ms wait. Implementing a busy wait got the accuracy to within 1%. I used: def busy_wait(dt): current_time = time.time() while (time.time() < current_time+dt): pass and could get down to 0.0001 seconds before breaking 1% accuracy. The main questions I have are: Why is the sleep function so inaccurate (possibly a C

问题 I'm busy with making an app for an android device. And now I'm testing with some things. I want to change the background color limited times, lets say 5. Every time the background's changed, I want it to change again after 2-3 seconds. If I am using the Thread class, it loads the whole template after the Thread has finished, you can't see the color changes, but they're running in the "background" (I can see that in LogCat). I hope that there is a tutorial or an example that I can use. Thanks!

问题 When streaming a video from an iPhone (or any iOS device) to a TV via Airplay, the stream stops as soon as the device goes to sleep from inactivity. At the moment, I disabled the sleep timer so that the device does not automatically sleep, but is there a better solution to this? Is setting AVPlayer.externalPlaybackActive enough to allow the OS to know to keep playing when the screen is off? If not, is there an alternate way to keep Airplay running even if the device turns off its screen? 回答1:

问题 I have the following code: private void button1_Click(object sender, EventArgs e) { var answer = MessageBox.Show( "Do you wish to submit checked items to the ACH bank? \r\n\r\nOnly the items that are checked and have the status 'Entered' will be submitted.", "Submit", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1); if (answer != DialogResult.Yes) return; button1.Enabled = false; progressBar1.Maximum = dataGridView1.Rows.Count; progressBar1.Minimum = 0

问题 Using Django (hosted by Webfaction), I have the following code import time def my_function(request): time.sleep(10) return HttpResponse("Done") This is executed via Django when I go to my url, www.mysite.com I enter the url twice, immediately after each other. The way I see it, both of these should finish after 10 seconds. However, the second call waits for the first one and finishes after 20 seconds. If, however, I enter some dummy GET parameter, www.mysite.com?dummy=1 and www.mysite.com