保存密码操作

最新推荐文章于 2022-01-25 09:13:51 发布

原创最新推荐文章于 2022-01-25 09:13:51 发布 · 546 阅读

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#android

实现退出程序记住密码的操作
代码如下:
activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_login"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:background="@drawable/loginbg"
    tools:context="cn.edu.bzu.case_login.LoginActivity">

    <include layout="@layout/login_top"></include>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@drawable/deer"
        android:id="@+id/imageView"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_marginBottom="23dp" />
</RelativeLayout>

login_top.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="@dimen/activity_horizontal_margin"
    android:background="@drawable/logintop_roundbg">

    <EditText
        android:id="@+id/etName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:drawable/edit_text"
        android:drawableLeft="@drawable/icon_user"
        android:drawablePadding="10dp"
        android:ems="10"
        android:hint="@string/etName">
        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/etPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/etName"
        android:background="@android:drawable/edit_text"
        android:drawableLeft="@drawable/icon_pass"
        android:drawablePadding="10dp"
        android:ems="10"
        android:hint="@string/etPass"
        android:inputType="textPassword">
        <requestFocus />
    </EditText>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/etPassword">
        <CheckBox
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="@string/password"
            android:layout_weight="1"
            android:id="@+id/ck_box"/>
        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/btn_select"
            android:text="@string/btnLogin"
            android:id="@+id/btn_login"/>
    </LinearLayout>
</RelativeLayout>

strings.xml

<resources>
    <string name="app_name">Case_Login</string>
    <string name="etName">请输入账号</string>
    <string name="etPass">请输入密码</string>
    <string name="btnLogin">登录</string>
    <string name="password">记住密码</string>
</resources>

LoginActivity

package cn.edu.bzu.case_login;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

import java.util.Map;

import cn.edu.bzu.utils.Utils;

public class LoginActivity extends AppCompatActivity implements View.OnClickListener{
    private CheckBox ck_box;
    private EditText etName;
    private EditText etPassword;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        initView();
        //取出号码
        Map<String,String> userInfo= Utils.getUerInfo(this);
        if (userInfo!=null){
            etName.setText(userInfo.get("username"));
            etPassword.setText(userInfo.get("password"));
            SharedPreferences sp=this.getSharedPreferences("data",Context.MODE_PRIVATE);
         if(sp.getBoolean("check",false)){
                ck_box.setChecked(sp.getBoolean("check",true));
            }
        }
    }
    private void initView(){
        ck_box=(CheckBox)findViewById(R.id.ck_box);
        etName=(EditText)findViewById(R.id.etName);
        etPassword=(EditText)findViewById(R.id.etPassword);
        findViewById(R.id.btn_login).setOnClickListener(this);
    }
    public void onClick(View view){
        //当单击"登录"时,获取账户和密码
        String username=etName.getText().toString().trim();
        String password=etPassword.getText().toString();
        //检验账户和密码是否为空
        if(TextUtils.isEmpty(username)){
            Toast.makeText(this,"请输入账户",Toast.LENGTH_SHORT).show();
            return ;
        }
        if(TextUtils.isEmpty(password)){
            Toast.makeText(this,"请输入密码 ",Toast.LENGTH_SHORT).show();
            return ;
        }
        //判断用户=admin,密码=123456
        if(username.equals("admin")&&password.equals("123456")){
            //是否勾选了记住密码
            boolean CheckBoxLogin = ck_box.isChecked();
           if(ck_box.isChecked()){
               //保存用户信息
               boolean isSaveSuccess=Utils.saveUserInfo(this,username,password,CheckBoxLogin);
           }else{
               Utils.del(this);
           }
            Intent intent=new Intent(this,Activity02.class);
            startActivity(intent);
        }else {
            Toast.makeText(this,"登录失败",Toast.LENGTH_SHORT).show();
        }
    }
}

Utils类（用于账户和密码的存储与读取）

package cn.edu.bzu.utils;

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

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

/**
 * Created by 李小宁 on 2017/4/8.
 */

public class Utils {
    //保存账号和密码到data.xml文件
    public static boolean saveUserInfo(Context context,String username,String password,boolean CheckBoxLogin){
        SharedPreferences sp=context.getSharedPreferences("data",Context.MODE_PRIVATE);
        SharedPreferences.Editor edit=sp.edit();  //创建一个Editor对象
        edit.putString("userName",username);
        edit.putString("pwd",password);
        edit.putBoolean("check",CheckBoxLogin);
        edit.commit();
        return true;
    }
    //从data.xml文件中获取存储的账户和密码
    public static Map<String,String> getUerInfo(Context context){
        SharedPreferences sp=context.getSharedPreferences("data",Context.MODE_PRIVATE);
        String username=sp.getString("userName",null);
        String password=sp.getString("pwd",null);
        Map<String,String> userMap=new HashMap<String, String>();
        userMap.put("username",username);
        userMap.put("password",password);
        return userMap;
    }
    public static void del(Context context){
        SharedPreferences sp=context.getSharedPreferences("data",Context.MODE_PRIVATE);
        SharedPreferences.Editor edit = sp.edit();
        edit.clear();
        edit.putBoolean("check",false);
        edit.commit();
    }
}

activity_02.xml（登录成功后跳转页面）

<?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:id="@+id/activity_02"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="cn.edu.bzu.case_login.Activity02">

    <TextView
        android:text="Hello world"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:id="@+id/textView"
        android:textSize="30dp"/>
</RelativeLayout>