检测用户何时将应用置于后台

Question

My android app uses an SQLite database. A service is triggered every weeks to update data. Once the service has downloaded the required data, it then writes data with writeData() into the database but I need the service to wait until the user is not using the app anymore.

So I have to call my writeData() function WHEN the app is put in background.

Is there a way to do that?

Answer 1

您可以创建一个singelton类，并且每当您的应用打开时都会初始化此singelton，因此每次调用写数据之前，请检查您的singelton是否为null，如果为null，则执行writedata方法；否则，用户正在打开应用

Answer 2

查看有关组件回调的此文档http://developer.android.com/reference/android/content/ComponentCallbacks2.html#TRIM_MEMORY_UI_HIDDEN

Answer 3

这听起来像onPause（）生命周期回调的用例。