A history service performs an operation that isn't directly found by the user. One example is, if an application applied a service to compact its storage, that will normally be described as a history service. TRIM_MEMORY_MODERATE Amount for onTrimMemory(int): the process is all over the middle of your history LRU http://mobileappdevelopmentservi81594.ampblogs.com/5-Easy-Facts-About-mobile-app-development-service-Described-21693923