简单java登录页面android_安卓实现简单的登录注册

清疚 2022-11-08 06:06 228阅读 0赞

【实例简介】

【实例截图】

![8d16fa33e40239d7719294f427015d29.png][]

![99279aeec138f7ff794292b97421160e.png][]

【核心代码】

package com.example.test1;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.DialogInterface;

import android.content.Intent;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.os.Bundle;

import android.view.KeyEvent;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.LinearLayout;

import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener\{

/\*\* Called when the activity is first created. \*/

//private static final String PREFS\_NAME = "MyInfo";//用来保存用户信息

public static EditText Num,Pwd;

private static Button Login,Post,pwdback;

//public static CheckBox RememberPwd,AutoLogin;

private DBHelper dbHelper;

public static SQLiteDatabase sdb;

@Override

public void onCreate(Bundle savedInstanceState) \{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

// AppConnect.getInstance(this);

//LinearLayout container =(LinearLayout)findViewById(R.id.AdLinearLayout);

//new AdView(this,container).DisplayAd();

//获得实例对象

Num=(EditText) findViewById(R.id.et\_Num);

Pwd=(EditText) findViewById(R.id.et\_Pwd);

Post=(Button) findViewById(R.id.Post);

pwdback = (Button) findViewById(R.id.pwdback);

Post.setOnClickListener(this);

pwdback.setOnClickListener(this);

dbHelper=new DBHelper(this,"Info.db");

//LoadUserDate();

@Override

public void onClick(View v) \{

// TODO Auto-generated method stub

switch(v.getId())\{

case R.id.btn\_Login:

if(Num.getText().toString().equals(""))\{

Toast.makeText(MainActivity.this,"姓名不能为空 ", Toast.LENGTH\_SHORT).show();

return;

if(Pwd.getText().toString().equals(""))\{

Toast.makeText(MainActivity.this,"号码不能为空 ", Toast.LENGTH\_SHORT).show();

return;

//SaveUserDate();

boolean bool=login(Num.getText().toString(),Pwd.getText().toString());

if(bool)\{

Toast.makeText(MainActivity.this, "登录成功！", Toast.LENGTH\_LONG).show();

Intent intent = new Intent();

intent.putExtra("name",Num.getText().toString());

intent.setClass(MainActivity.this, AfterLogin.class);

MainActivity.this.startActivity(intent);

\}else\{

Toast.makeText(MainActivity.this, "用户名或密码有误！", Toast.LENGTH\_LONG).show();

return;

break;

case R.id.Post:

Intent intent=new Intent(MainActivity.this,Register.class);

startActivity(intent);

break;

case R.id.pwdback:

//System.out.println("被响应");

Intent intent1 = new Intent();

//intent.putExtra("name",Num.getText().toString());

intent1.setClass(MainActivity.this, pwdback.class);

MainActivity.this.startActivity(intent1);

break;

//登录

public boolean login(String username,String password)\{

String name = new Security().Encryption(username);

String pwd = new Security().Encryption(password);

/\*SQLiteDatabase\*/ sdb=dbHelper.getReadableDatabase();

String sql="select \* from people where name=? and pwd=?";

Cursor cursor=sdb.rawQuery(sql, new String\[\]\{name,pwd\});

if(cursor.moveToFirst()==true)\{

cursor.close();

return true;

return false;

//退出

public boolean onKeyDown(int keyCode, KeyEvent event) \{

if (keyCode == KeyEvent.KEYCODE\_BACK ) \{

AlertDialog.Builder builder = new Builder(MainActivity.this);

builder.setIcon(android.R.drawable.ic\_dialog\_info);

builder.setMessage("确定要退出?");

builder.setTitle("提示");

builder.setPositiveButton("确认",

new android.content.DialogInterface.OnClickListener() \{

public void onClick(DialogInterface dialog, int which) \{

dialog.dismiss();

MainActivity.this.finish();

\});

builder.setNegativeButton("取消",

new android.content.DialogInterface.OnClickListener() \{

public void onClick(DialogInterface dialog, int which) \{

dialog.dismiss();

\});

builder.create().show();

return false;

// /\*\*

// \* 保存用户信息

// \*/

//private void SaveUserDate() \{

载入配置文件

//SharedPreferences sp = getSharedPreferences(PREFS\_NAME, 0);

写入配置文件

//Editor spEd = sp.edit();

//if (RememberPwd.isChecked()) \{

//spEd.putBoolean("isSave", true);

//spEd.putString("name", Num.getText().toString());

//spEd.putString("password", Pwd.getText().toString());

//\} else \{

//spEd.putBoolean("isSave", false);

//spEd.putString("name", "");

//spEd.putString("password", "");

//\}

//spEd.commit();

//\}

///\*\*

// \* 载入已记住的用户信息

// \*/

//private void LoadUserDate() \{

//SharedPreferences sp = getSharedPreferences(PREFS\_NAME, 0);

//if (sp.getBoolean("isSave", false)) \{

//String username = sp.getString("name", "");

//String userpassword = sp.getString("password", "");

//if (!("".equals(username) && "".equals(userpassword))) \{

//Num.setText(username);

//Pwd.setText(userpassword);

//RememberPwd.setChecked(true);

//\}

[8d16fa33e40239d7719294f427015d29.png]: /images/20221023/cf3ba95ef7104b6eb57f7fac247f7c64.png
[99279aeec138f7ff794292b97421160e.png]: /images/20221023/cdf7e81efe114aa1b637a93612d7e6f4.png

简单java登录页面android_安卓实现简单的登录注册

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