登录功能LoginActivity.java

一个简单的界面

这里也是调用后台

public class RetrofitClient {
    public   static  String IP="http://218.7.112.123:10001/";
    private static Retrofit retrofit=new Retrofit.Builder()
            .baseUrl(IP)
            .addConverterFactory(GsonConverterFactory.create())
            .build();

    public RetrofitClient(){

    }
    public static  apiService apiService(){
        return retrofit.create(apiService.class);
    }
}

实现接口

 @POST("/prod-api/api/login")
    Call getLoginData(@Body LoginBean loginBean);

 获取输入框内容，然后去调用登录接口，接下来去获取用户id,这里就要单独创建一个getUserId的类去实现了，在这个类里面调用用户信息接口，代码如下

package com.example.smartcity.Activity;

import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Parcelable;
import android.os.TokenWatcher;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.example.smartcity.Bean.LoginBean;
import com.example.smartcity.Bean.MsgBean;
import com.example.smartcity.Bean.UserInfoBean;
import com.example.smartcity.R;
import com.example.smartcity.network.RetrofitClient;
import com.example.smartcity.network.Utils;

import java.util.Collections;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class LoginActivty extends AppCompatActivity {
    private static final String TAG = "LoginActivty";
    private EditText loginEdName;
    private EditText loginEdPassword;
    private Button loginBut;
    private Button reBut;
    private SharedPreferences user;
    private String token;
    private String name;
    private String password;
    private Button loginRegiter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_activty);
        initView();
        user = getSharedPreferences("user", MODE_PRIVATE);


        loginBut.setOnClickListener(v -> {
            String username = loginEdName.getText().toString().trim();
            String password = loginEdPassword.getText().toString();
            LoginBean loginBean = new LoginBean(username, password);
            RetrofitClient.apiService().getLoginData(loginBean).enqueue(new Callback() {
                @SuppressLint("CommitPrefEdits")
                @Override
                public void onResponse(Call call, Response response) {
                    MsgBean body = response.body();
                    if (body.getCode()==200&&body!=null) {
                        String token = body.getToken();
                        SharedPreferences.Editor edit = user.edit();
                        edit.putString("username",username);
                        edit.putString("password",password);
                        edit.putString("userId","");
                        edit.putString("token",token);
                        edit.apply();
                        Utils.login=1;
                        getUserId();
                        finish();
                    }else {
                        Toast.makeText(LoginActivty.this,body.getMsg(),Toast.LENGTH_SHORT).show();

                    }
                }

                @Override
                public void onFailure(Call call, Throwable throwable) {

                }
            });
        });

    }

    private void getUserId() {
        RetrofitClient.apiService().getUserInoFoData(user.getString("token","")).enqueue(new Callback() {
            @SuppressLint("CommitPrefEdits")
            @Override
            public void onResponse(Call call, Response response) {
                UserInfoBean body = response.body();
                if (body.getCode()==200&body!=null) {
                    UserInfoBean.UserBean user1 = body.getUser();
                    int userId = user1.getUserId();
                    SharedPreferences.Editor edit = user.edit();
                    edit.putString("username","");
                    edit.putString("password","");
                    edit.putString("userId",Integer.toString(userId));
                    edit.apply();
                    Toast.makeText(LoginActivty.this,"登陆成功",Toast.LENGTH_SHORT).show();

                }
            }

            @Override
            public void onFailure(Call call, Throwable throwable) {

            }
        });
    }

    private void initView() {

        loginEdName = (EditText) findViewById(R.id.login_ed_name);
        loginEdPassword = (EditText) findViewById(R.id.login_ed_password);
        loginBut = (Button) findViewById(R.id.login_but);


    }
}