安卓小记——SharedPreferences的应用(注册数据的保存)

紧接上文，我们使用SharedPreferences来存储用户注册的信息
先新建一个SharedPreferences类

package com.cbz.blog;

import android.content.Context;
import android.content.SharedPreferences;

import java.util.HashMap;
import java.util.Map;

public class SP {
    public static boolean saveUserInfo(Context context,String number,String password){
        SharedPreferences sp = context.getSharedPreferences("data", context.MODE_PRIVATE);
        SharedPreferences.Editor edit = sp.edit();
        edit.putString("username",number);
        edit.putString("pwd",password);
        edit.commit();

        return true;
    }


    public static Map<String,String> getUserInfo(Context context){
        SharedPreferences sp = context.getSharedPreferences("data", context.MODE_PRIVATE);
        String username = sp.getString("username", "");
        String password = sp.getString("pwd", "");
        Map<String,String> userMap = new HashMap<>();
        userMap.put("number",username);
        userMap.put("password",password);

        return userMap;
    }
}

再对之前的Mian函数做一些小小的改动

package com.cbz.blog;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.Map;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button button;
private EditText name;
private EditText password;

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

        initView();

        //Map<String, String> userInfo = File.getUserInfo(this);
        Map<String, String> userInfo = SP.getUserInfo(this);
        if (userInfo!=null){
            name.setText(userInfo.get("number"));
            password.setText(userInfo.get("password"));
        }


    }

    private void initView() {
        button = (Button) findViewById(R.id.button);
        name=(EditText) findViewById(R.id.name);
        password=(EditText)findViewById(R.id.password);
        button.setOnClickListener(this);
    }

    public void onClick(View v){
        String number = name.getText().toString().trim();
        String passwords = password.getText().toString();

        if(TextUtils.isEmpty(number)){
            Toast.makeText(this,"输入账号",Toast.LENGTH_LONG).show();
            return;
        }
        if(TextUtils.isEmpty(passwords)){
            Toast.makeText(this,"输入密码",Toast.LENGTH_LONG).show();
            return;
        }
        Toast.makeText(this,"登录成功",Toast.LENGTH_LONG).show();


        //boolean isSaveSucess = File.saveUserInfo(this, number, passwords);
        boolean isSaveSucess = SP.saveUserInfo(this, number, passwords);
        if (isSaveSucess){
            Toast.makeText(this,"保存成功",Toast.LENGTH_LONG).show();
        }else {
            Toast.makeText(this,"保存失败",Toast.LENGTH_LONG).show();
        }


    }

    }

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最后编辑时间为: Jun 2, 2020 at 06:59 pm