自己写runOnUiThread

 private Handler mHandler = new Handler(getContext().getMainLooper());
    public void runOnUiThread(Context mContext,Runnable action){

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.CUPCAKE) {
            if (Thread.currentThread() !=  mContext.getMainLooper().getThread()) {
                mHandler.post(action);//将Runnable Post到消息队列，由内部的mHandler来处理，实际上也是Handler的处理方式

            } else {
                action.run();//已经在UI线程，直接运行。
            }
        }


    }