As new versions of Android become available, you should test your app on the new version and update this value to match the latest API level in order to take advantage of new platform features.
minSdkVersion <= targetSdkVersion <= compileSdkVersion
minSdkVersion (lowest possible) <= targetSdkVersion == compileSdkVersion (latest SDK)
用较低的 minSdkVersion 来覆盖最大的人群,用最新的 SDK 设置 target 和 compile 来获得最新特性。