Android中一种ThreadPool的实现

可以简单的将任务在UI线程或者非UI线程中执行。

代码如下：（可以看作精简版的AsyncTask）

public class ThreadPool {
    private static final int CORE_POOL_SIZE = 5;

    private static final int MAXIMUM_POOL_SIZE = 128;

    private static final int KEEP_ALIVE = 1;

    private static final ThreadFactory sThreadFactory = new ThreadFactory() {
        private final AtomicInteger mCount = new AtomicInteger(1);

        public Thread newThread(Runnable r) {
            return new Thread(r, "AsyncTask #" + mCount.getAndIncrement());
        }
    };

    private static final BlockingQueue sPoolWorkQueue = new LinkedBlockingQueue(
            10);

    private static Handler sUIHandler = new Handler(Looper.getMainLooper());

    private static final Executor THREAD_POOL_EXECUTOR = new ThreadPoolExecutor(CORE_POOL_SIZE,
            MAXIMUM_POOL_SIZE, KEEP_ALIVE, TimeUnit.SECONDS, sPoolWorkQueue, sThreadFactory);

    public static void runOnPool(Runnable command) {
        THREAD_POOL_EXECUTOR.execute(command);
    }

    public static void runOnUI(Runnable command) {
        sUIHandler.post(command);
    }

    public static void postUiDelay(Runnable command, long delayMillis) {
        sUIHandler.postDelayed(command, delayMillis);
    }
}

在代码的任何位置，你只要想在异步线程中执行一段代码:

ThreadPool.runOnPool(new Runnable(){...});

在任何线程中，你想在UI线程中执行一个更新：

ThreadPool.runOnUI(new Runnable(){...});

这会让你的代码实现异步加载然后更新UI布局变得非常简单。

例如：

ThreadPool.runOnPool(new Runnable(){

    void run(){

        loadData();//后台操作

        ThreadPool.runOnUI(new Runnable(){

                  refreshUI();//更新界面

              };

        )

    }

});