AIDL是安卓接口定义语言的简称，用于进程间通信 ,
AIDL默认支持的数据类型有：八种基本数据类型、String、List
如果要使用AIDL传递类对象，就必须让类实现Parcelable接口
文件结构如图所示
1.创建自定义类型
people.java
public class People implements Parcelable { String name; int age; public People(int age,String name){ this.age = age; this.name = name; } public People(Parcel in) { name = in.readString(); age = in.readInt(); } public static final Creator<People> CREATOR = new Creator<People>() { @Override public People createFromParcel(Parcel in) { return new People(in); } @Override public People[] newArray(int size) { return new People[size]; } }; @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel dest, int flags) { dest.writeString(name); dest.writeInt(age); } }
people.aidl
package com.example.aidl; parcelable People;
IPeopleManager.aidl
package com.example.aidl; // Declare any non-default types here with import statements import com.example.aidl.People; interface IPeopleManager { /** * Demonstrates some basic types that you can use as parameters * and return values in AIDL. */ void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat, double aDouble, String aString); int getAge(); String getName(); void addPeople(in People people); }
aidl方法传入自定义类对象时，in、out、inout必须写(aidl默认支持的类型不用写，默认且只能是in)，否则报错。
.27-34: 'com.example.aidl.People' can be an out type, so you must declare it as in, out, or inout.
关于参数前的in、out和inout，跨进程时，in参数会把参数的内容传给aidl，但其改动不会同步到调用进程；out参数不会把参数的属性传给aidl(aidl获取的参数对象属性为空)，但其改动会同步到调用进程；inout参数则是in和out的综合。不跨进程时，三者则是摆设
然后编译项目，如果提示找不到符号
public void addPeople(com.example.aidl.People people) throws android.os.RemoteException;
则需要在build.gradle 的android标签下文件中加入如下代码
sourceSets { main { manifest.srcFile 'src/main/AndroidManifest.xml' java.srcDirs = ['src/main/java', 'src/main/aidl'] resources.srcDirs = ['src/main/java', 'src/main/aidl'] aidl.srcDirs = ['src/main/aidl'] res.srcDirs = ['src/main/res'] assets.srcDirs = ['src/main/assets'] } }
