ThreadUtils

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import android.os.Handler; import android.os.Looper;   import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors;     public class ThreadUtils {       private static Handler sHandler = new Handler(Looper.getMainLooper());       private static ExecutorService sExecutorService = Executors.newSingleThreadExecutor();       //Runnable：任务，必须依附于某一个线程     //Thread:线程，线程用来执行任务     //Process：进程     //保证r这个任务一定是在主线程中执行     public static void runOnUiThread(Runnable r){           if(Looper.myLooper() == Looper.getMainLooper()) {             //主线程             //new Thread(r).start(); 一旦new了Thread就一定是子线程             r.run();         } else {             //new Thread(r).start()             sHandler.post(r);         }           /*new Thread(new Runnable(){             @Override             public void run() {               }         }).start();*/     }       //保证r一定在子线程中得到执行     public static void runOnSubThread(Runnable r) {         //new Thread(r).start();         //线程池的概念，线程池里面装的是线程，使用线程池可以达到线程的复用，提高性能         sExecutorService.submit(r);//将r丢到线程池中，线程池中的线程就会来执行r这个任务     } }