本文主要是介绍android中finish()和onDestroy()的关系，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
一、activity的onDestroy()函数
Google解释：
/**
* Perform any final cleanup before an activity is destroyed. This can
* happen either because the activity is finishing (someone called
* {@link #finish} on it, or because the system is temporarily destroying
* this instance of the activity to save space. You can distinguish
* between these two scenarios with the {@link #isFinishing} method.
*
* <p><em>Note: do not count on this method being called as a place for
* saving data! For example, if an activity is editing data in a content
* provider, those edits should be committed in either {@link #onPause} or
* {@link #onSaveInstanceState}, not here.</em> This method is usually implemented to
* free resources like threads that are associated with an activity, so
* that a destroyed activity does not
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