AIDL使用

一.新建一个项目AIDLservice，创建Person类并继承Parcelable接口。

public class Person implements Parcelable {         private String name;    private int grade;    public Person(String name ,int grade){             this.name = name;        this.grade = grade;    }    protected Person(Parcel in){             this.name = in.readString();        this.grade = in.readInt();    }    public static final Creator<Person> CREATOR = new Creator<Person>() {             @Override        public Person createFromParcel(Parcel in) {                 return new Person(in);        }        @Override        public Person[] newArray(int size) {                 return new Person[size];        }    };    @Override    public int describeContents() {             return 0;    }    @Override    public void writeToParcel(Parcel dest, int flags) {             dest.writeString(name);    }}

二.创建Person.aidl

只有将类在AIDL中声明后，AIDL才能调用该Person类。

三.创建MyAidl.aidl(作用：设置让客户端允许调用的接口)

四.创建AidlService.java并注册这个Service

public class AidlService extends Service {         private ArrayList<Person> persons;    @Nullable    @Override    public IBinder onBind(Intent intent) {             persons = new ArrayList<>();        Log.e("AidlService","success onBind");        return iBinder;    }    private IBinder iBinder = new Myaidl.Stub() {             @Override        public void addPerson(Person person) throws RemoteException {                 persons.add(person);        }        @Override        public List<Person> getPersonList() throws RemoteException {                 return persons;        }    };    @Override    public void onCreate() {             super.onCreate();        Log.e("AidlService","onCreate success");    }}

因为服务端的Service需要被客户端来远程绑定，所以客户端要能够找到这个Service，可以通过先指定包名，之后再配置Action值或者直接指定Service类名的方式来绑定Service。本文将在客户端通过指定Action值的方式来绑定Service，所以需要将Service在项目AIDLclient的AndroidManifest.xml中进行如下注册：

<service android:name=".AidlService"            android:enabled="true"            android:exported="true">            <intent-filter>                <action android:name="myAidlService"/>                <category android:name="android.intent.category.DEFAULT"/>            </intent-filter> </service>

此时服务端的代码就写完了，下面来写客户端的代码。
五.再次新建一个项目AIDLclient，把项目AIDLservice中的aidl那个文件夹复制到项目AIDLclient中，把项目AIDLservice中的Person.java复制到项目AIDLclient中，注意这两次复制时要保证包名不能改变，保证是原封不动的复制。

六.直接修改MainActivity的代码：

public class MainActivity extends AppCompatActivity {         private final String TAG = "AIDLclient";    private Myaidl myAidl;    private Button btn;    private boolean connected;    private ServiceConnection connection = new ServiceConnection() {             @Override        public void onServiceConnected(ComponentName name, IBinder service) {                 Log.e(TAG,"onServiceConnected success");            myAidl = Myaidl.Stub.asInterface(service);            connected = true;        }        @Override        public void onServiceDisconnected(ComponentName name) {                 Log.e(TAG,"onServiceDisconnected success");            myAidl = null;            connected = false;        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {             super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        bindService();    }    private void initView(){             btn = findViewById(R.id.button);        btn.setOnClickListener(new View.OnClickListener() {                 @Override            public void onClick(View v) {                     try {                         if(connected){                             myAidl.addPerson(new Person("Van",59));                        List<Person> persons = myAidl.getPersonList();                        Log.e(TAG,persons.toString());                    }                    else {                             Log.e(TAG,"未连接");                    }                }catch (Exception e){                         e.printStackTrace();                }            }        });    }    private void bindService(){             Intent intent = new Intent();//        intent.setComponent(new ComponentName("com.example.aidlservice","com.example.aidlservice.AidlService"));        intent.setPackage("com.example.aidlservice");        intent.setAction("myAidlService");        bindService(intent,connection, Context.BIND_AUTO_CREATE);    }    @Override    protected void onDestroy() {             super.onDestroy();        if(connected)            unbindService(connection);    }}

七.结果
先启动服务APP，再启动客户端APP，当客户端APP启动后，服务端APP的日志如下：
点击客户端按钮后客户端APP日志如下：

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