第九次作业

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.text.TextUtils;
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 EditText et_account;
    private EditText et_password;
    private Button btn_login;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        Map<String,String>userInfo=SPSaveQQ.getUserInfo(this);
        if (userInfo!=null){
            et_account.setText(userInfo.get("account"));
            et_password.setText(userInfo.get("password"));
        }
    }
    private void initView(){
        et_account=(EditText)findViewById(R.id.et_number);
        et_password=(EditText)findViewById(R.id.et_password);
        btn_login=(Button)findViewById(R.id.btn_login);
        btn_login.setOnClickListener(this);
    }
    public void onClick(View view){
        switch (view.getId()){
            case R.id.btn_login:
                String account=et_account.getText().toString().trim();
                String password=et_password.getText().toString();
                if (TextUtils.isEmpty(account)){
                    Toast.makeText(this,"请输入QQ账号",Toast.LENGTH_LONG).show();
                    return;
                }
                if (TextUtils.isEmpty(password)){
                    Toast.makeText(this,"请输入密码",Toast.LENGTH_LONG).show();
                    return;
                }
                Toast.makeText(this,"登陆成功",Toast.LENGTH_LONG).show();
                boolean isSaveSuccess=SPSaveQQ.saveUserInfor(this,account,password);
                if (isSaveSuccess){
                    Toast.makeText(this,"保存成功",Toast.LENGTH_LONG).show();
                }
                else {
                    Toast.makeText(this,"保存失败",Toast.LENGTH_LONG).show();
                }
                break;
        }
    }
}

package com.example.myapplication;

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

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

public class SPSaveQQ {
    public static  boolean saveUserInfor(Context context,String account,String password){
        SharedPreferences sp=context.getSharedPreferences("data",Context.MODE_PRIVATE);
        SharedPreferences.Editor edit=sp.edit();
        edit.putString("userName",account);
        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 account =sp.getString("userName",null);
        String password=sp.getString("pwd",null);
        Map<String,String>userMap=new HashMap<String, String>();
        userMap.put("account",account);
        userMap.put("password",password);
        return userMap;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#E6E6E6"
    tools:context=".MainActivity">
    <ImageView
        android:id="@+id/iv_head"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="40dp"
        android:src="@drawable/zhaoqian" />

    <LinearLayout
        android:id="@+id/layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/iv_head"
        android:layout_margin="10dp"
        android:background="#ffffff"
        android:orientation="vertical" >

        <RelativeLayout
            android:id="@+id/rl_username"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp" >

            <TextView
                android:id="@+id/tv_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:text="账号" />

            <EditText
                android:id="@+id/et_number"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_toRightOf="@+id/tv_name"
                android:background="@null" />
        </RelativeLayout>

        <View
            android:layout_width="match_parent"
            android:layout_height="2dp"
            android:background="#E6E6E6" />

        <RelativeLayout
            android:id="@+id/rl_userpsw"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp" >

            <TextView
                android:id="@+id/tv_psw"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:text="密码" />

            <EditText
                android:id="@+id/et_password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_toRightOf="@+id/tv_psw"
                android:inputType="textPassword"
                android:background="@null" />
        </RelativeLayout>
    </LinearLayout>

    <Button
        android:id="@+id/btn_login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/layout"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:layout_marginTop="20dp"
        android:background="#3C8DC4"
        android:text="登录"
        android:textColor="#ffffff" />


</RelativeLayout>