安卓应用：自动记住登录密码-优快云博客

本文链接：https://blog.youkuaiyun.com/lyy666888/article/details/78971241

本文介绍在安卓应用中实现自动保存和填充密码的功能，包括设置SharedPreferences存储用户信息，以及在登录界面自动填充已保存的用户名和密码。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

布局文件是:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="70dp"
            android:textSize="18sp"
            android:text="用户名:"
            android:layout_height="wrap_content" />

        <EditText
            android:id="@+id/udv"
            android:layout_width="match_parent"
            android:hint="请输入用户名"
            android:layout_height="wrap_content" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="70dp"
            android:textSize="18sp"
            android:text="密码:"
            android:layout_height="wrap_content" />
        <EditText
            android:id="@+id/pdv"
            android:layout_width="match_parent"
            android:hint="请输入密码"
            android:layout_height="wrap_content" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <CheckBox
            android:id="@+id/remember_pass"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <TextView
            android:layout_width="wrap_content"
            android:textSize="18sp"
            android:text="记住密码"
            android:layout_height="wrap_content" />
    </LinearLayout>
    <Button
        android:id="@+id/login"
        android:textSize="20sp"
        android:layout_width="350dp"
        android:layout_gravity="center_horizontal"
        android:background="@drawable/but"
        android:text="登陆"
        android:layout_height="60dp" />

</LinearLayout>

Activity 中的代码

package action.svse.com.lyydemo;

import android.content.Intent;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class LoginActivity extends AppCompatActivity {
    //声明组件
    private SharedPreferences pref;
    private SharedPreferences.Editor editor;
    private EditText accountEdit;
    private EditText passwordEdit;
    private Button login;
    private CheckBox rememberPass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        //获取组件
        pref = PreferenceManager.getDefaultSharedPreferences(this);
        accountEdit = (EditText) findViewById(R.id.udv);
        passwordEdit = (EditText) findViewById(R.id.pdv);
        rememberPass = (CheckBox) findViewById(R.id.remember_pass);
        login = (Button) findViewById(R.id.login);
        boolean isRemember = pref.getBoolean("remember_password", false);
        if (isRemember) {
            //将账号和密码设置在文本框中
            String account = pref.getString("account", "");
            String password = pref.getString("password", "");
            accountEdit.setText(account);
            passwordEdit.setText(password);
            rememberPass.setChecked(true);
        }
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String account = accountEdit.getText().toString();
                String password = passwordEdit.getText().toString();
                //如果帐号是admin 密码是123456，登陆成功
                if (account.equals("admin") && password.equals("123456")) {
                    editor = pref.edit();
                    if (rememberPass.isChecked()) {//检查复选框是否被选中
                        editor.putBoolean("remember_password", true);
                        editor.putString("account", account);
                        editor.putString("password",password);
                    }else {
                        editor.clear();
                    }
                    editor.apply();
                    Intent intent=new Intent(LoginActivity.this,MainActivity.class);
                    startActivity(intent);
                    finish();
                }else {
                    Toast.makeText(LoginActivity.this,"account or password is invalid",Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}