摘要： public final classMessageextends Objectimplements Parcelablejava.lang.Object ↳ android.os.MessageClass Overview（类概述）Defines a message containing a description and arbitrary data object that can be sent to a Handler. This object contains two extra int fields and an extra object field that allow you t 阅读全文

摘要： public final classClassextends Objectimplements Serializable AnnotatedElement GenericDeclaration Typejava.lang.Object ↳ java.lang.Class<T>Class Overview（类概述）The in-memory representation of a Java class. This representation serves as the starting point for querying class-related information, a 阅读全文

摘要： 简单地理解：margin为外边框，border为边框，padding为内边框。如果上下左右的距离不同可以通过以下的属性进行设置。margin：android:layout_marginTopandroid:layout_marginBottomandroid:layout_marginLeftandroid:layout_marginRightpadding：android:paddingTopandroid:paddingBottomandroid:paddingLeftandroid:paddingRight如果上下左右的距离都是相同的也可以通过以下属性进行设置。margin：androi 阅读全文