android 线程池监听

在Android中，可以通过实现ThreadPoolExecutor类的子类来监听线程池的状态。具体步骤如下：

1. 创建一个ThreadPoolExecutor的子类，并重写其beforeExecute、afterExecute和terminated方法。

2. 在beforeExecute方法中记录线程开始执行的时间，并将线程状态设置为“正在执行”。

3. 在afterExecute方法中记录线程结束执行的时间，并将线程状态设置为“已完成”。

4. 在terminated方法中输出线程池的状态信息，包括线程池的大小、已完成的任务数、正在执行的任务数等。

下面是一个示例代码：

public class MyThreadPoolExecutor extends ThreadPoolExecutor {

    public MyThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue) {
        super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue);
    }

    @Override
    protected void beforeExecute(Thread t, Runnable r) {
        super.beforeExecute(t, r);
        System.out.println("Thread " + t.getName() + " start time: " + System.currentTimeMillis());
        System.out.println("Thread " + t.getName() + " status: " + "running");
    }

    @Override
    protected void afterExecute(Runnable r, Throwable t) {
        super.afterExecute(r, t);
        Thread t1 = Thread.currentThread();
        System.out.println("Thread " + t1.getName() + " end time: " + System.currentTimeMillis());
        System.out.println("Thread " + t1.getName() + " status: " + "completed");
    }

    @Override
    protected void terminated() {
        super.terminated();
        System.out.println("Thread pool status: ");
        System.out.println("Core pool size: " + getCorePoolSize());
        System.out.println("Maximum pool size: " + getMaximumPoolSize());
        System.out.println("Largest pool size: " + getLargestPoolSize());
        System.out.println("Task count: " + getTaskCount());
        System.out.println("Completed task count: " + getCompletedTaskCount());
        System.out.println("Active count: " + getActiveCount());
    }
}

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