用户登录(记住密码)

来源：互联网发布：阴阳路抄墓碑知乎编辑：程序博客网时间：2024/05/01 12:19

用户登录页面，点击登陆后会出现welcomeyou的页面，选中记住密码，再次打开会保存用户名和密码。主要是将用户名和密码保存在rememberpassword.xml中。
1、运行效果图：
这里写图片描述

2、实现过程：
(1)、布局文件:
这里写图片描述
activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:id="@+id/activity_main"    android:background="@drawable/loginbg"    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="bzu.edu.cn.case_login.MainActivity">    <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" /></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="match_parent"    android:background="@drawable/logintop_groungdg"    android:padding="@dimen/activity_horizontal_margin">    <EditText        android:id="@+id/etName"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:ems="10"        android:background="@android:drawable/edit_text"        android:drawableLeft="@drawable/icon_user"        android:hint="@string/etName"        android:drawablePadding="10dp"        >        <requestFocus/>    </EditText>    <EditText        android:id="@+id/etPassword"        android:layout_below="@id/etName"        android:inputType="textPassword"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:ems="10"        android:background="@android:drawable/edit_text"        android:drawableLeft="@drawable/icon_pass"        android:hint="@string/etName"        android:drawablePadding="10dp">        <requestFocus/>    </EditText>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@+id/etPassword"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true">        <CheckBox            android:layout_width="0dp"            android:layout_height="48dp"            android:layout_weight="1"            android:id="@+id/cblsRemember"            android:textSize="20sp"            android:text="记住密码"/>        <Button            android:onClick="login"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:layout_marginLeft="10dp"            android:background="@drawable/btn_select"            android:text="@string/btnLogin"            android:textSize="20sp"/>    </LinearLayout></RelativeLayout>

需要的图片：
这里写图片描述
将btn_select.xml，btn_shape.xml，btn_shape_after.xml和logintop_groungdg.xml放到drawable中
logintop_groungdg.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="rectangle">    <corners android:radius="10dp"></corners>    <solid android:color="#55FFFFFF"></solid></shape>

btn_select.xml

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">   <item android:drawable="@drawable/btn_shape" android:state_pressed="false"></item>    <item android:drawable="@drawable/btn_shape_after" android:state_pressed="true"></item></selector>

btn_shape.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"><solid android:color="#FF72CAE1"></solid>    <corners android:radius="10dp"></corners></shape>

btn_shape_after.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"><solid android:color="#87cefa"></solid>    <corners android:radius="10dp"></corners></shape>

activity_welcome.xml

<?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_welcome"    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="bzu.edu.cn.case_login.WelcomeActivity">   <TextView    android:layout_width="match_parent"    android:layout_height="match_parent"       android:text="welcome you"       android:textSize="45sp"/></RelativeLayout>

(2)、
MainActivity.xml

package bzu.edu.cn.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.view.View;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    private EditText etName;    private EditText etPassword;    private SharedPreferences sharedPreferences;    private CheckBox cblsRemember;    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        sharedPreferences = getSharedPreferences("rememberpassword", Context.MODE_PRIVATE);        boolean isRemembered=sharedPreferences.getBoolean("rememberpassword",false);        if (isRemembered){            String name=sharedPreferences.getString("name","");            String password=sharedPreferences.getString("password","");            etName.setText(name);            etPassword.setText(password);            cblsRemember.setChecked(true);        }    }    private void initView() {        etName = (EditText) findViewById(R.id.etName);        etPassword = (EditText) findViewById(R.id.etPassword);        cblsRemember = (CheckBox) findViewById(R.id.cblsRemember);    }    public void login(View view) {        String name = etName.getText().toString();        String password = etPassword.getText().toString();        if ("admin".equals(name) && "123456".equals(password)) {            SharedPreferences.Editor editor = sharedPreferences.edit();            if (cblsRemember.isChecked()) {                editor.putBoolean("rememberpassword", true);                editor.putString("name", name);                editor.putString("password", password);            }else{                editor.clear();            }            editor.commit();            Intent intent=new Intent(this,WelcomeActivity.class);            startActivity(intent);            finish();        }else {            Toast.makeText(this,"账号或密码有误",Toast.LENGTH_LONG).show();        }    }}

WelcomeActivity.xml

package bzu.edu.cn.case_login;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;public class WelcomeActivity extends AppCompatActivity {    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_welcome);    }}

3、清单文件

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="bzu.edu.cn.case_login">    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity android:name=".WelcomeActivity"></activity>    </application></manifest>

保存用户名和密码使用了SharedPreferences，它是一种轻型的数据存储方式，它的本质是基于XML文件存储key-value键值对数据，通常用来存储一些简单的配置信息。其存储位置在/data/data/<包名>/shared_prefs目录下。SharedPreferences对象本身只能获取数据而不支持存储和修改，存储修改是通过Editor对象实现。

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