runnable | 易学教程

How to execute a piece of code only after all threads are done

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问题 I have a logging code which needs to be executed after all Threads s are executed. Thread t1 = new MyThread(); Thread t2 = new MyThread(); t1.run(); t2.run(); doLogging(); Is there any way to execute doLogging() only after both threads are done with their processing. Now that doLogging() is called as soon as t1 and t2 are started. 回答1: Just join() all threads before your doLogging() call: t1.join(); t2.join(); // the following line will be executed when both threads are done doLogging(); Note

How to execute a piece of code only after all threads are done

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How to execute a piece of code only after all threads are done

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Attempt to read from field 'android.view.View android.support.v7.widget.RecyclerView$ViewHolder.itemView'

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问题 I am trying to select recyclerview item randomly with delay.I need to start random selection method after fragment load without any user interaction,But getting the following error. Afterward I put it on ImageView click to check but again I am getting same exception.Will anybody here tell me where I am making a mistake,or what else could be better way to achieve this.Below is my code package com.apponative.bjja.fragments; import android.os.Bundle; import android.os.Handler; import android

java并发callable，runnable，future和futureTask

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java多线程 java实现多线程有两种方式：一个是直接继承Thread类，一种是实现Runnable接口。但这2种方式都有一个缺陷就是：在执行完任务之后无法获取执行结果。于是后面又增加了Callable和Future，通过它们可以在任务执行完毕之后得到任务执行结果。 callable与runnable java.lang.Runnable是一个接口，在它里面只声明了一个run()方法： public interface Runnable { public abstract void run(); } 由于run()方法返回值为void类型，所以在执行完任务之后无法返回任何结果。　　Callable位于java.util.concurrent包下，它也是一个接口，在它里面也只声明了一个方法，只不过这个方法叫做call()： public interface Callable<V> { /** * Computes a result, or throws an exception if unable to do so. * * @return computed result * @throws Exception if unable to compute a result */ V call() throws Exception; } 可以看到，这是一个泛型接口，call(

Android Java: “Cannot resolve” in postDelayed

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问题 I am using the first answer here to try to initiate a repeating task, updating a seekbar ("timeSlider") to show progress as an audio file plays. The repeating function is updateTimeSlider() . When initiated via postDelayed , updateTimeSlider gives a "cannot resolve symbol" error (see image at the bottom of this post). updateTimeSlider() does not give that error when on a line by itself (also shown in the image). (Note that updateTimeSlider() on the line by itself is not really how the code

progressBar and refresh webview combination android

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问题 EDIT: I am using a ProgressBar for a Webview that works fine. Now I want to refresh my Webview, which also works. When I am trying to combine them, the Spinner doesn't end at all. This is my code: private final Runnable m_Runnable = new Runnable() { public void run() { //Toast.makeText(WebcamsScreen.this,"in runnable",Toast.LENGTH_SHORT).show(); doRefreshingStuff(id); WebcamsScreen.this.mHandler.postDelayed(m_Runnable, 20000); } }; public void onCreate(Bundle savedInstanceState) { super

Why is there no default java implementation of Delayed for DelayQueue?

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问题 I'd like a DelayQueue of scheduled Runnable s, where each Runnable s should only be run after a certain point in time, specified beforehand. Hence a thread can just keep removing runnables from this queue and process a schedule of events. Why is there no good default implementation of Delayed, that is also Runnable , for this? The only subinterface of Delayed that seems reasonable is RunnableScheduledFuture, which has a whole bunch of random things that need to be implemented. There has to be

Runnable posted in another runnable not executed

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问题 I'm trying to run a runnable from another runnable using Handler.post() method of my singleton but this second runnable is not being run until after the original runnable finishes. In the example code below I am calling MyManager,getInstance().startCommand() from somewhere in the application. The myRun variable in the MyCommand class has a sleep put on the thread so I can test a timeout feature, but the runnable called mTimeoutTimer is not be executed until AFTER the myRun runnable is

Call the method of Java class which implements runnable after creating its thread object

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问题 I have a java class SomeClass implements Runnable Which has a method display(). When I create a thread of this class Thread thread1 = new Thread(new SomeClass()); Now how I can call the display() method using the thread instance? 回答1: You will end up calling start() on thread1 . SomeClass will override run() method which in turn need to call display() method. This way when you call start() , run method of SomeClass() object will be invoked and display() method will be executed. Example: