个人中心MyFragment.Java

先写一个简单的界面

创建一个用来判断是否登录的类

package com.example.smartcity.network;

public class Utils {
    public static int login=0;
}

接下来的代码如下，登录后回传用户昵称，登录成功后按钮文字显示为退出登录

package com.example.smartcity.ui.fiv;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;

import com.example.smartcity.Activity.DingDanLieBiao;
import com.example.smartcity.Activity.LoginActivty;
import com.example.smartcity.Activity.NewPaswordAcivity;
import com.example.smartcity.Activity.TiJiaoFanKuiActivity;
import com.example.smartcity.Activity.UsreInFoActivity;
import com.example.smartcity.Bean.UserInfoBean;
import com.example.smartcity.R;
import com.example.smartcity.network.RetrofitClient;
import com.example.smartcity.ui.dashboard.DashboardViewModel;

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

import static com.example.smartcity.network.Utils.login;

public class FivFragment extends Fragment {

    private DashboardViewModel dashboardViewModel;
    private View root;
    private ImageView userInfoSrc;
    private TextView userInfoNikeName;
    private LinearLayout userInfoUserInfo;
    private LinearLayout userInfoDingDan;
    private LinearLayout userInfoXiuGaiMiMa;
    private LinearLayout userInfoTiJaoFanKui;
    private SharedPreferences user;
    private Button userBut;

    @SuppressLint("CommitPrefEdits")
    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        dashboardViewModel =
                new ViewModelProvider(this).get(DashboardViewModel.class);
        root = inflater.inflate(R.layout.fivhome, container, false);
        initView();
        user = getActivity().getSharedPreferences("user", Context.MODE_PRIVATE);

        userBut.setOnClickListener(v -> {

                startActivity(new Intent(getContext(), LoginActivty.class));
                SharedPreferences.Editor edit = user.edit();
                edit.putString("username","");
                edit.putString("password","");
                edit.putString("userId","");
                edit.putString("token","");
                edit.apply();


        });
        userInfoUserInfo.setOnClickListener(v -> {

                    startActivity(new Intent(getContext(), UsreInFoActivity.class));
                });
        userInfoDingDan.setOnClickListener(v -> {

                    startActivity(new Intent(getContext(), DingDanLieBiao.class));


        });
        userInfoXiuGaiMiMa.setOnClickListener(v -> {

                startActivity(new Intent(getContext(), NewPaswordAcivity.class));

        });
        userInfoTiJaoFanKui.setOnClickListener(v -> {

                startActivity(new Intent(getContext(), TiJiaoFanKuiActivity.class));

        });


        return root;
    }

    @Override
    public void onResume() {
        super.onResume();
        if (login==0){
            userBut.setText("登录");
        }else {
            userBut.setText("退出登录");
            getUserInfoData();
        }
    }

    private void getUserInfoData() {
        RetrofitClient.apiService().getUserInoFoData(user.getString("token","")).enqueue(new Callback() {
            @Override
            public void onResponse(Call call, Response response) {
                UserInfoBean body = response.body();
                if (body!=null&&body.getCode()==200) {
                    UserInfoBean.UserBean user = body.getUser();
                    String nickName = user.getNickName();
                    userInfoNikeName.setText(nickName);
                }
            }

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

            }
        });
    }

    private void initView() {

        userInfoSrc = (ImageView) root.findViewById(R.id.userInfo_src);
        userInfoNikeName = (TextView)  root.findViewById(R.id.userInfo_nikeName);
        userInfoUserInfo = (LinearLayout)  root.findViewById(R.id.userInfo_userInfo);
        userInfoDingDan = (LinearLayout)  root.findViewById(R.id.userInfo_DingDan);
        userInfoXiuGaiMiMa = (LinearLayout)  root.findViewById(R.id.userInfo_xiuGaiMiMa);
        userInfoTiJaoFanKui = (LinearLayout)  root.findViewById(R.id.userInfo_TiJaoFanKui);
        userBut = root.findViewById(R.id.fiv_but);
    }
}