PS：在使用Runnable时，可能会内存泄露。Runnable是一个匿名内部类，因此它对当前Activity有一个隐式引用。如果Activity在销毁之前，任务还未完成， 那么将导致Activity的内存资源无法回收，造成内存泄漏。那么该怎么解决这种问题呢？代码如下，

    static class MyRunnable implements Runnable {
        @Override
        public void run() {
       //执行任务
        }
    }
使用 静态内部类，避免了Activity的内存资源泄漏。
 

1、Runnable对象

Runnable runnable = new Runnable() {@Overridepublic void run() {Log.i("Lgq","runnable111"+Thread.currentThread().getName());textView.setText("aaaaaaaaaaa");}
};

2、Handler调用Runnable对象

Handler handler =new Handler();
handler.post(runnable);

03-22 15:21:49.950 9126-9126/com.tianxin.httpheader I/Lgq: runnable111main

3、Thread调用Runnable对象

Thread thread = new Thread(runnable,"abcc");
thread.start();

03-22 15:21:49.936 9126-9222/com.tianxin.httpheader I/Lgq: runnable111abcc
 

4、handler构造方法弱引用实现

 

private Handler mHandler;

 

mHandler = new InnerHandler(this);

 

private static class InnerHandler extends Handler {private WeakReference<DetectActivity> mWeakReference;public InnerHandler(DetectActivity activity) {super();this.mWeakReference = new WeakReference<>(activity);}@Overridepublic void handleMessage(Message msg) {if (mWeakReference == null || mWeakReference.get() == null) {return;}DetectActivity activity = mWeakReference.get();if (activity == null) {return;}if (msg == null) {return;}switch (msg.what) {case MSG_INITVIEW:activity.start();break;default:break;}}
}