数据存储登录案例

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数据存储登录案例

这节课我们学习了数据的存储，并做了一个案例，以下就是我们所做的案例的相关代码和图片显示。

Activity_main.xml代码如下所示：

<?xml version="1.0"encoding="utf-8"?>

<RelativeLayoutxmlns: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_centerVertical="true"

android:layout_centerHorizontal="true"

android:textSize="40sp"

android:layout_marginTop="263dp"

android:id="@+id/textView" />

</RelativeLayout>

在输入正确的密码和账号之后，就会显示这个界面，如果输入错误，则会提示错误信息；

Activity_login.xml代码如下所示：

<?xml version="1.0"encoding="utf-8"?>

<RelativeLayoutxmlns: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">

<includelayout="@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_marginRight="18dp"

android:layout_marginEnd="18dp"

android:layout_marginBottom="10dp"

android:id="@+id/imageView" />

</RelativeLayout>

Login_top.xml代码如下所示：

<?xml version="1.0"encoding="utf-8"?>

<RelativeLayoutxmlns: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_roundbag">

<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">

</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/etPassword"

android:inputType="textPassword">

</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>

MainActivity.java代码如下所示：

packagecn.edu.bzu.case_login;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

@Override

protected voidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

LoginActivity.java代码如下所示：

packagecn.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.support.v7.view.ContextThemeWrapper;

import android.view.View;

import android.widget.CheckBox;

import android.widget.Checkable;

import android.widget.EditText;

import android.widget.Toast;

public classLoginActivity extends AppCompatActivity {

privateEditText etName;

privateEditText etPassword;

privateCheckBox cbIsRememberPass;

privateSharedPreferences sharedPreferences;

@Override

protected voidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_login);

initViews(); sharedPreferences=getSharedPreferences("rememberpassword", Context.MODE_PRIVATE);

booleanisRemember=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);

}

public voidinitViews(){

etName=(EditText) findViewById(R.id.etName);

etPassword=(EditText) findViewById(R.id.etPassword);

cbIsRememberPass=(CheckBox) findViewById(R.id.cbIsRememberPass);

}

public voidlogin(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=newIntent(this,MainActivity.class);

startActivity(intent);

finish();

}else{

Toast.makeText(this,"账号或密码有误",Toast.LENGTH_LONG).show();

}

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