如何使用onWindowFocusChanged()方法?

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问题描述

我对活动更改时如何触发事件感到困惑.我知道的一件事是使用onWindowFocusChanged()方法，但我不知道如何使用它.请举一个例子，例如，当活动发生变化时，它应该显示一个吐司，说活动已更改".

I am confused in how to trigger an event when the activity is changed. One thing that I know is using onWindowFocusChanged() method but I don't know how to use it. Please help in one example i.e. when the activity changes, it should show a toast said "Activity changed".

推荐答案

当窗口的焦点改变时，将调用以下方法.例如，如果窗口获得/丢失焦点，则将触发它.如果窗口获得焦点，则hasFocus为true，否则为false.

The following method gets called when window's focus changes. For instance, if the window gains/losses focus, it will be triggered. In case, the window gains focus, hasFocus is true and false otherwise.

 public void onWindowFocusChanged(boolean hasFocus) {         
     super.onWindowFocusChanged(hasFocus);
     if(hasFocus) 
         Toast.makeText(context, text, duration).show();
 }

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