/**
* The set of callback APIs that are common to all application components
* ({@link android.app.Activity}, {@link android.app.Service},
* {@link ContentProvider}, and {@link android.app.Application}).
*/
application应用组件回调api集合接口； ComponentCallbacks接口
包含两个接口方法：
1.
unlike activities, other components * are never restarted when a configuration changes: they must always deal * with the results of the change, such as by re-retrieving resources.
void onConfigurationChanged(@NonNull Configuration newConfig);
2.
/** * This is called when the overall system is running low on memory, and * actively running processes should trim their memory usage. While * the exact point at which this will be called is not defined, generally * it will happen when all background process have been killed. * That is, before reaching the point of killing processes hosting * service and foregro
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