用户登录记住密码

来源：互联网发布：淘宝拍卖书画是真的吗编辑：程序博客网时间：2024/05/01 09:02

当用户选中了记住密码复选框，并成功登录一次之后，这个时候如果再重新启动登录界
面，之前输入的用户名和密码就会显示在文本框中。涉及 SharedPreferences 的使用。这是简单的页面布局这里写图片描述登录后的欢迎界面

主要的页面实现代码

<?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_main"    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="com.example.bz0209.myapplication.MainActivity"    android:background="#8ECFE5"    >    <EditText        android:hint="请输入账号"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginLeft="54dp"        android:layout_marginStart="54dp"        android:layout_marginTop="33dp"        android:id="@+id/textView2"        />    <EditText        android:text="请输入密码"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/textView2"        android:layout_alignLeft="@+id/textView2"        android:layout_alignStart="@+id/textView2"        android:layout_marginTop="10dp"        android:id="@+id/textView3" />    <CheckBox        android:text="记住密码"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignTop="@+id/button"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginLeft="20dp"        android:layout_marginStart="20dp"        android:id="@+id/checkBox"        android:layout_alignBottom="@+id/button" />    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        app:srcCompat="@drawable/icon_user"        android:layout_above="@+id/textView3"        android:layout_toLeftOf="@+id/textView3"        android:layout_toStartOf="@+id/textView3"        android:id="@+id/imageView" />    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        app:srcCompat="@drawable/icon_pass"        android:layout_alignBottom="@+id/textView3"        android:layout_toLeftOf="@+id/textView3"        android:layout_toStartOf="@+id/textView3"        android:id="@+id/imageView2" />    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        app:srcCompat="@drawable/deer"        android:id="@+id/imageView3"        android:layout_below="@+id/button"        android:layout_alignParentRight="true"        android:layout_alignParentEnd="true"        android:layout_marginRight="15dp"        android:layout_marginEnd="15dp"        android:layout_marginTop="12dp" />    <Button        android:text="登录"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginTop="15dp"        android:id="@+id/button"        android:layout_below="@+id/textView3"        android:layout_toRightOf="@+id/textView3"        android:layout_marginLeft="47dp"        android:layout_marginStart="47dp"        android:layout_alignRight="@+id/imageView3"        android:layout_alignEnd="@+id/imageView3"        android:background="@drawable/btn"        /></RelativeLayout>

内部的Java实现代码，主要用到SharedPreferences。

package com.example.bz0209.myapplication;import android.content.Intent;import android.content.SharedPreferences;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    private EditText editText1;    private EditText editText2;    private Button button;    private CheckBox checkBox;    SharedPreferences sharedPreferences;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        intView();        sharedPreferences=getSharedPreferences("login",MODE_PRIVATE);        boolean isRem=sharedPreferences.getBoolean("checkBox",false);        if(isRem){            String name=sharedPreferences.getString("name","");            String pass=sharedPreferences.getString("pass","");            editText1.setText(name);            editText2.setText(pass);            checkBox.isChecked(true);        }    }    private void intView(){        editText1=(EditText) findViewById(R.id.textView2);        editText2=(EditText) findViewById(R.id.textView3);        button=(Button) findViewById(R.id.button);        checkBox=(CheckBox) findViewById(R.id.checkBox);    }    private void login(){       String name=editText1.getText().toString();        String pass=editText2.getText().toString();        SharedPreferences.Editor editor=sharedPreferences.edit();        if(checkBox.isChecked()){            editor.putBoolean("checkBox",true);            editor.putString("name",name);            editor.putString("pass",pass);        }        else            editor.clear();        editor.commit();        if("admin".equals(name)&&"pass".equals(pass)){            Intent intent=new Intent(this,welcome.class);            startActivity(intent);            finish();        }        else            Toast.makeText(this,"账号或密码错误",Toast.LENGTH_LONG).show();    }package com.example.bz0209.myapplication;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;public class welcome extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_welcome);    }}}

0 0