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It is not difficult to see whether the onTouchEvent () of activity can be called depends on the if condition getWindow (). SuperDispatchTouchEvent (ev).《地下铁路》（Underground）描述了传说中的「地下铁路」（亦称地下逃亡线，Underground Railroad）——19世纪美国废奴主义者建立起一个把黑奴送到自由州、加拿大、墨西哥甚至海外的秘密网络，史称「地下铁路」。由于协助黑奴逃亡在当时是死罪，因此参与这个秘密网络的人和通过这个秘密网络逃亡的黑奴都面临巨大的危险。更糟的是，政府重金招募了一群穷凶极恶的雇佣兵来追捕「地下铁路」成员及那些逃走的黑奴。在该剧中，一群黑人奴隶决心从位于乔治亚州的种植园启程，沿着查塔胡奇河（Chattahoochee River）长途跋涉六百英里奔向北方的自由区。一对秘密支持废奴主义的夫妻在「地下铁路」中建立起一个中转站，与那些奉命捉拿逃跑奴隶的雇佣兵展开斗智斗勇的较量。那些雇佣兵并不在乎奴隶的死活，因此他们是非常可怕的对手。　　这个女孩没想到的是，她从此便卷入了职场爱情和办公室政治的缠斗之中…这次板栗回京，他也跟着回来了。From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code:同时也感谢书友【☆少帅●】的催更票，3000字的催更和打赏没有什么区别。四个年轻人来到森林探险，女孩雀儿与伙伴走散，路上遇到了野人。