android -简单注册登录页面应用

来源：互联网发布：齐次坐标知乎编辑：程序博客网时间：2024/06/05 11:50

小白今天写了一段注册登录代码与大家分享不足请指出

首先写一个javabean

package com.my.domain;

public class User {
private String account;//账号
private String password;//密码
public String getAccount() {
return account;
}
public void setAccount(String account) {
this.account = account;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

public String toString() {
return "account=" + account + ", password=" + password ;
}
public User(){
super();
}

public User(String account ,String password){
super();
this.account=account;
this.password=password;
}

}

写一个dao层

package com.my.db.service;
import com.my.domain.User;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

/**
*
*登录用户数据的操作
*
*/

public class UserService {
private DBOpenHelper helper;// 创建DBOpenHelper对象
private SQLiteDatabase db;// 创建SQLiteDatabase对象
public UserService(Context cxt){
helper=new DBOpenHelper(cxt);// 初始化DBOpenHelper对象
}

//登录用
public boolean login(String account,String psw){
db=helper.getReadableDatabase();
String sql1="select account,password from user where account=? and password=?";
Cursor cursor=db.rawQuery(sql1, new String[]{account,psw});
if(cursor.moveToFirst()==true){
cursor.close();
return true;
}
return false;
}
//注册用
public boolean register(User user){
db=helper.getWritableDatabase();
String sql= "insert into user(account,password) values(?,?)";
Object obj[]={user.getAccount().toString(),user.getPassword().toString()};
db.execSQL(sql, obj);
return true;

}

//检查用户名是否存在
public boolean checkAccount(String account){
db=helper.getReadableDatabase();
String query="select * from user where account=? ";
Cursor cursor=db.rawQuery(query, new String[]{account});
if(cursor.moveToNext()){
cursor.close();
return true;
}
cursor.close();
return false;

}

}

注册页面

package com.activity;

import com.my.db.service.DBOpenHelper;
import com.my.db.service.UserService;
import com.my.domain.User;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

/**
*
* @author 注册页面
*
*/
public class Register extends Activity {

public EditText enter_account, enter_psw, confirm_psw;
public String psw1;
public String psw2;
public String account;
UserService uService = new UserService(this);
User user = new User();

protected void onCreate(Bundle saBundle) {
super.onCreate(saBundle);
setContentView(R.layout.register);
// 获取输入账号id
enter_account = (EditText) findViewById(R.id.register_enter_account);
// 获取输入密码id
enter_psw = (EditText) findViewById(R.id.register_enter_psw);
// 获取确认密码id
confirm_psw = (EditText) findViewById(R.id.register_confirm_psw);

// 获取注册按钮
Button sign_up = (Button) findViewById(R.id.sign_up);
// 添加事件
sign_up.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

account = enter_account.getText().toString().trim();
psw1 = enter_psw.getText().toString().trim();
psw2 = confirm_psw.getText().toString().trim();
// 输入账号或者密码为空时候不能登录
if ("".equals(account) || "".equals(psw1)) {
new AlertDialog.Builder(Register.this).setTitle("错误").setMessage("帐号或密码不能空")
.setPositiveButton("确定", null).show();
}
// 判断输入账号是否存在
else if (uService.checkAccount(account)) {
Toast.makeText(Register.this, "该用户名已被注册", Toast.LENGTH_SHORT).show();
enter_account.setText("");

}
// 如果两次输入密码一样就插入数据，
else if (psw1.equals(psw2)) {
user.setAccount(account);
user.setPassword(psw1);
uService.register(user);
Toast.makeText(Register.this, "注册成功", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(Register.this, Login.class);
startActivity(intent);
} else {
Toast.makeText(Register.this, "注册失败，两次输入密码不一样", Toast.LENGTH_SHORT).show();
enter_psw.setText("");
confirm_psw.setText("");
}

}
});
// 获取重置按钮并且添加事件
Button cz = (Button) findViewById(R.id.cz);
cz.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
enter_account.setText("");
enter_psw.setText("");
confirm_psw.setText("");

}
});

}

}

登录页面

package com.activity;

import com.my.db.service.UserService;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

/**
* 、
*
* @author登录页面
*
*/

public class Login extends Activity {
public EditText login_edit_account, login_edit_pwd;
public String edit_account;
public String edit_pwd;
UserService uService = new UserService(Login.this);

protected void onCreate(Bundle saBundle) {
super.onCreate(saBundle);
setContentView(R.layout.login);
// 获取注册按钮并为其添加事件
Button register = (Button) findViewById(R.id.register);
register.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
// 点击按钮 new一个意图打开注册页面
Intent intent1 = new Intent(Login.this, Register.class);
startActivity(intent1);

}
});

login_edit_account = (EditText) findViewById(R.id.login_edit_account);
login_edit_pwd = (EditText) findViewById(R.id.login_edit_pwd);

// 获取登录按钮并为其绑定事件
Button login = (Button) findViewById(R.id.login);
login.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

edit_account = login_edit_account.getText().toString().trim();
edit_pwd = login_edit_pwd.getText().toString().trim();
//判断输入账号或者密码是否为空
if (edit_account.equals("") || edit_pwd.equals("")) {
new AlertDialog.Builder(Login.this).setTitle("错误").setMessage("账号或密码不能为空")
.setPositiveButton("确定", null).show();
}
// 对输入的值进行判断，调用UserService login函数

else if (uService.login(edit_account, edit_pwd)) {
Toast.makeText(Login.this, "登录成功", Toast.LENGTH_SHORT).show();
Intent intent2 = new Intent(Login.this, MainActivity.class);
startActivity(intent2);

} else {
Toast.makeText(Login.this, "登录失败，输入账号或者密码错误，请重新输入！", Toast.LENGTH_SHORT).show();
login_edit_account.setText("");
login_edit_pwd.setText("");
}
}
});

}

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@drawable/login_bj"

>

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="10px"
android:paddingTop="150px" >



<ImageView
android:id="@+id/faceImg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/dl_2" />

<EditText
android:id="@+id/login_edit_account"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/faceImg"
android:hint="输入帐号"
android:paddingLeft="45sp"
android:textColor="#ff0000" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/login_edit_account"
android:layout_alignLeft="@+id/login_edit_account"
android:layout_alignTop="@+id/login_edit_account"
android:layout_marginRight="15sp"
android:gravity="center_vertical"
android:paddingLeft="7sp"
android:text="帐号:"
android:textSize="10dp" />

<EditText
android:id="@+id/login_edit_pwd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/login_edit_account"
android:layout_alignRight="@+id/login_edit_account"
android:layout_below="@+id/login_edit_account"
android:hint="输入密码"
android:paddingLeft="45sp"
android:inputType="textPassword"
android:textColor="#ff0000" />

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/login_edit_pwd"
android:layout_alignLeft="@+id/login_edit_pwd"
android:layout_alignTop="@+id/login_edit_pwd"
android:layout_marginRight="15.0sp"
android:gravity="center_vertical"
android:paddingLeft="7sp"
android:text="密码:"
android:textSize="10dp"
/>

<Button
android:id="@+id/register"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_below="@+id/login_edit_pwd"
android:layout_alignLeft="@+id/login_edit_pwd"
android:text="注册"
android:textColor="#FF0000" />
<Button
android:id="@+id/login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/login_edit_pwd"
android:layout_toRightOf="@id/register"
android:text="登录"
android:textColor="#FF0000" />

</RelativeLayout>

</LinearLayout>

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

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tablayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/login_bj" >

<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:src="@drawable/sign1" />

<TableRow
android:id="@+id/tablerow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >

<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="账号:"
android:textSize="15sp" />

<EditText
android:id="@+id/register_enter_account"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="3"
android:hint="请输入账号"
android:singleLine="true" />
</TableRow>

<TableRow
android:id="@+id/tablerow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >

<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="密码:"
android:textSize="15sp" />

<EditText
android:id="@+id/register_enter_psw"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="3"
android:hint="请输入密码"
android:inputType="textPassword"
android:singleLine="true" />
</TableRow>

<TableRow
android:id="@+id/tablerow3"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >

<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="确认密码:"
android:textSize="15sp" />

<EditText
android:id="@+id/register_confirm_psw"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="3"
android:hint="请确认密码"
android:inputType="textPassword"
android:singleLine="true" />
</TableRow>

<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content" >

<Button
android:id="@+id/sign_up"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_weight="1"
android:text="注册"
android:textColor="#FF0000" />

<Button
android:id="@+id/cz"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="重置"
android:textColor="#FF0000" />
</TableRow>

</TableLayout>

效果图

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