用户登录记住密码

来源：互联网发布：知鸟二维码图片编辑：程序博客网时间：2024/05/01 10:04

1.当用户选择了记住密码的复选框，并成功登陆一次后，这个时候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。
这里写图片描述

2.创建一个登陆的界面，设计用户交互界面
在layout中新建login_top.xml登录界面：

<?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:text="记住密码"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:id="@+id/cbIsRememberPass"            android:textSize="20sp"            android:layout_weight="1" />        <Button            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:background="@drawable/btn_select"            android:onClick="login"            android:text="@string/btnLogin" />    </LinearLayout></RelativeLayout>

在activity_login.xml中引用login_top.xml:

"><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:layout_alignParentBottom="true"        android:layout_alignParentRight="true"        android:layout_alignParentEnd="true"        android:layout_marginBottom="20dp"        android:id="@+id/imageView" /></RelativeLayout>

activity_main:

<?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_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="cn.edu.bzu.case_login.MainActivity">    <TextView        android:text="Welcome you"        android:layout_width="wrap_content"        android:layout_height="wrap_content"       android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:textSize="50sp"        android:layout_marginTop="260dp"        android:id="@+id/textView" /></RelativeLayout>

LoginActivity.java代码:

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.view.View;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;public class LoginActivity extends AppCompatActivity {    private EditText etName;    private EditText etPassword;    private CheckBox cbIsRememberPass;    private SharedPreferences sharedPreferences;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_login);        initViews();        sharedPreferences=getSharedPreferences("rememberpassword", Context.MODE_PRIVATE);        boolean isRemember=sharedPreferences.getBoolean("rememberpassword",false);        if(isRemember) {            String name = sharedPreferences.getString("name", "");            String password = sharedPreferences.getString("password", "");            etName.setText(name);            etPassword.setText(password);            cbIsRememberPass.setChecked(true);        }    }    private void initViews(){        etName=(EditText)findViewById(R.id.etName);        etPassword=(EditText)findViewById(R.id.etPassword);        cbIsRememberPass=(CheckBox)findViewById(R.id.cbIsRememberPass);    }    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(cbIsRememberPass.isChecked()){                editor.putBoolean("rememberpassword",true);                editor.putString("name",name);                editor.putString("password",password);            }else{                editor.clear();            }            editor.commit();            Intent intent=new Intent(this,MainActivity.class);            startActivity(intent);            finish();        }else {            Toast.makeText(this,"账号或密码有误",Toast.LENGTH_LONG).show();        }    }}

在layout的drawable下:
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>

loginbg.xml:

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" >    <gradient          android:startColor="#FFACDAE5"        android:endColor="#FF72CAE1"        android:angle="45"         /></shape>

logintop_roundbg.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>

0 0