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AIDL (Android Interface Definition Language)
Implementing IPC Using AIDL : Creating an .aidl File
AIDL is a simple syntax that lets you declare an interface with one or more methods, that can
take parameters and return values. These parameters and return values can be of any type,
even other AIDL-generated interfaces. However, it is important to note that you must import all
non-built-in in types, even if they are defined in the same package as your interface. Here are the
data types that AIDL can support:
• Primitive Java programming language types (int, boolean, etc) - No import statement is needed.
• One of the following classes (no import statements needed):
• String
• List - All elements in the List must be one of the types in this list, including other AIDL-generated
interfaces and parcelables. List may optionally be used as a "generic" class (e.g. List). The
actual concrete class that the other side will receive will always be an ArrayList, although the method will
be generated to use the List interface.
• Map - All elements in the Map must be of one of the types in this list, including other AIDL-generated
interfaces and parcelables. Generic maps, (e.g. of the form Map are not supported. The
actual concrete class that the other side will receive will always be a HashMap, although the method will
be generated to use the Map interface.
• CharSequence - This is useful for the CharSequence types used by TextView and other widget objects.
• Other AIDL-generated interfaces, which are always passed by reference. An import statement
is always needed for these.
• Custom classes that implement the Parcelable protocol and are passed by value. An import
statement t t is always needed d for these.
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