建立一个记住密码的登录界面

在layout下新建一个名为login_top.xml的文件

<?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:ems="10"
       android:background="@android:drawable/edit_text"        android:drawableLeft="@drawable/icon_user"
       android:drawablePadding="10dp"        android:hint="@string/etName"
>

    <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:drawablePadding="10dp"
       android:hint="@string/etPass"
>

        <requestFocus/>

    </EditText>

    <LinearLayout        android:layout_below="@id/etPassword"
       android:layout_width="match_parent"        android:layout_height="wrap_content">

 

        <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
4000
:layout_height="wrap_content"            android:layout_weight="1"
           android:background="@drawable/btn_select"            android:onClick="login"
           android:text="登录"/>

    </LinearLayout>

 

</RelativeLayout>

在layout下新建一个名为activity_login.xml的文件

<?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.a01.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_marginRight="12dp"     android:layout_marginEnd="12dp"
    android:layout_marginBottom="32dp"
/>

 

</RelativeLayout>

在layout下新建一个名为activity_main.xml的文件

 

<?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.a01.MainActivity">

 

    <TextView        android:text="Welcome you"        android:layout_width="wrap_content"
       android:layout_height="wrap_content"        android:layout_centerVertical="true"
       android:layout_centerHorizontal="true"        android:textSize="40sp"
       android:id="@+id/textView"
/>

</RelativeLayout>

 

在drawable下新建一个名为btn_select.xml的文件,具体代码如下：

<?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>

在drawable下新建一个名为btn_shape.xml的文件,具体代码如下：

 

<?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>

在drawable下新建一个名为loginbg.xml的文件：

<?xml version="1.0"
encoding="utf-8"?><shape
xmlns:android="http://schemas.android.com/apk/res/android">

    <gradient        android:startColor="#FFACDAE5"

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       android:endColor="#FF72CAE1"        android:angle="45"
       />

 

</shape>

在drawable下新建一个名为logintop_roundbg.xml的文件

<?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>

 

在values下的strings.xml文件中

<resources>

    <string
name="app_name">01</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="btnRegister">注册</string>

</resources>

 

 

在java下的LoginActivity文件下

 

package cn.edu.bzu.a01;

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);

 

        initView();

        sharedPreferences=getSharedPreferences("data",
Context.MODE_PRIVATE);

        boolean
isRemember=sharedPreferences.getBoolean("remamberpassword",false);

        if
(isRemember){

            String name=sharedPreferences.getString("name","");

            String password=sharedPreferences.getString("password","");

            etName.setText(name);

            etPassword.setText(password);

            cbIsRememberPass.setChecked(true);

        }

 

    }

 

    private void
initView() {

        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("remamberpassword",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,
"账号或密码错误", Toast.LENGTH_SHORT).show();

        }

 

    }

}

 

在java下新建一个Activity-MainActivity文件

 

package cn.edu.bzu.a01;

import android.support.v7.app.AppCompatActivity;import
android.os.Bundle;

public class MainActivity
extends AppCompatActivity {

 

    @Override    protected void
onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

}