AIDL communication between two APPs

创建服务端

一、创建服务端App

        项目名：power

        包名：com.nys.power

aidl:是用于定义服务器和客户端通信接口的一种描述语言,Mainly used for communication between processes;

二、创建AIDL文件,Only the business logic interface is made,Rebuild项目,Let the project generate an interface file with the same name

The corresponding package name is automatically created

在aidlAdd a logical interface to the file

interface PowerAidlInterface {

    void setAccount(String user,String pwd);
    String getInfo();


    /**
     * 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);
}

After adding the logical interfaceRebuild Let the project generate an interface file with the same name

三、创建一个Java类,Inherit the abstract class in the interface file（Stub）,并完成业务逻辑

public class PowerImpl extends PowerAidlInterface.Stub{

    private String user;
    private String pwd;


    @Override
    public void setAccount(String user, String pwd) throws RemoteException {
        this.user=user;
        this.pwd=pwd;
    }

    @Override
    public String getInfo() throws RemoteException {
        String[] userarray=new String[]{"admin","user"};
        String[] pwdarray=new String[]{"123","111"};

        
        for (int i=0;i<userarray.length;i++){
            if (user.equals(userarray[i])){
                if (pwd.equals(pwdarray[i])){
                    return "登录成功";
                }
            }
        }
        return "登陆失败";
    }

    @Override
    public void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat, double aDouble, String aString) throws RemoteException {

    }
}

 四、expose the interface,使用Service

public class PowerService extends Service {
    public PowerService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        return new PowerImpl();
    }


}

创建客户端

一、创建客户端App

        项目名称：login

        包名：com.nys.login

二、将服务器的,aidl文件复制到客户端app中,Rebuid,Let the project generate an interface file with the same name

Display the file in the explorer,Then copy the file to the client'ssrc文件夹下,然后Rebuid

 三 、在Activity中绑定接口,使用接收到的Binder通信

public class MainActivity extends AppCompatActivity {

    TextInputEditText text_user;
    TextInputEditText text_pwd;
    Button btn_login;

    PowerAidlInterface powerAidlInterface;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        text_user=findViewById(R.id.text_user);
        text_pwd=findViewById(R.id.text_pwd);
        btn_login=findViewById(R.id.btn_login);

        Intent intent=new Intent();
        intent.setComponent(new ComponentName("com.nys.power","com.nys.power.PowerService"));
        bindService(intent,conn,BIND_AUTO_CREATE);

        btn_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                String user = text_user.getText().toString();
                String pwd = text_pwd.getText().toString();
                try {
                    powerAidlInterface.setAccount(user,pwd);
                    String result = powerAidlInterface.getInfo();
                    Toast.makeText(MainActivity.this, result, Toast.LENGTH_SHORT).show();
                } catch (RemoteException e) {
                    e.printStackTrace();
                }
            }
        });
    }
    private ServiceConnection conn=new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            powerAidlInterface=PowerAidlInterface.Stub.asInterface(iBinder);
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {

        }
    };
}

At this time, the communication is not successful,因为版本原因,The path to the server needs to be added to the registry

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.nys.login">
    <queries >
        <package android:name="com.nys.power"/>
    </queries>
    
    ...

</manifest>