SharedPreferences存储数据

实体类对象如何转换成JSON字符串类型：

https://blog.csdn.net/qq_32115447/article/details/106786777

一、整体压缩代码包

OkHttp.zip

二、实现步骤

1.添加fastjson依赖

api ‘com.alibaba:fastjson:1.1.46.android’

2.定义SharedPreferences成员变量

3.定义SharedPreferences局部变量

4.将字符串转换成json格式，创建编辑器，翻译，提交，即可保存数据。

三、整体代码
1.MainActivity文件代码

package com.example.ok;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.alibaba.fastjson.JSONObject;
import com.example.ok.bean.UserInfoBean;
import com.test.mldlib.okhttp.OKHttpCallBack;
import com.test.mldlib.okhttp.OKHttpUtils;
import java.io.IOException;
import okhttp3.Call;
import okhttp3.OkHttpClient;
public class MainActivity extends AppCompatActivity {
    private EditText et_account;
    private EditText et_password;
    private TextView tv_date;
    private TextView tv_data;
    private Button btn_login;
    private SharedPreferences sp;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        sp=getSharedPreferences("data",MODE_PRIVATE);
    }
    public void initView(){
        et_account=findViewById(R.id.et_account);
        et_password=findViewById(R.id.et_password);
        btn_login=findViewById(R.id.btn_login);
        tv_date=findViewById(R.id.tv_date);
        tv_data=findViewById(R.id.tv_data);
        btn_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
       login(et_account.getText().toString().trim(),et_password.getText().toString().trim());
            }
        });
    }
    public void login(String account,String password){
        OKHttpUtils.newBuilder().url("http://zhdj.yiruoche.com/index.php/user/login?")
                .post()
                .addParam("phone",account)
                .addParam("password",password)
                .build()
                .enqueue(new OKHttpCallBack<UserInfoBean>() {
                    @Override
                    public void onSuccess(UserInfoBean userInfoBean) {
                        if (userInfoBean.getCode()==1){
                            Intent intent=new Intent();
                            intent.setClass(MainActivity.this,HomePageActivity.class);
                            startActivity(intent);
                        }
                        String msg = userInfoBean.getMsg();
         Toast.makeText(MainActivity.this, userInfoBean.getMsg(), Toast.LENGTH_SHORT).show();
                        tv_date.setText(msg);
                        tv_data.setText(userInfoBean.getData().getUser().getUsername());
                        String jsonString = JSONObject.toJSONString(userInfoBean);
                        SharedPreferences.Editor edit = sp.edit();
                        edit.putString("userInfoBean",jsonString);
                        edit.commit();
                    }
                    @Override
                    public void onError(int code) {
                        super.onError(code);
                       Toast.makeText(MainActivity.this," "+code, Toast.LENGTH_SHORT).show();
                    }
                    @Override
                    public void onFailure(Call call, IOException e) {
                        super.onFailure(call, e);
                     Toast.makeText(MainActivity.this, "登录失败", Toast.LENGTH_SHORT).show();
                    }
             });
      }
}