Android studio登陆注册的实现及介绍_勤奋的oyoung_android studio登录注册界面实现

irpas 02-07 3891

Android studio登陆注册的实现及介绍前言设计思路效果图登陆模块注册模块数据库模块去除顶部标题总结与补充

前言

大家好！我是oy，今天给大家带来Android studio登陆注册的实现及介绍，第一次写博客，请见谅。

设计思路创建好activity并进行页面设计；创建用户类和数据库类；完善登陆和注册java代码；去掉头顶的标题栏，end；效果图

登陆模块

登陆界面代码片. 布局代码很简单的自己看吧

<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/purple_200" android:orientation="vertical" tools:context=".MainActivity"> <ImageView android:layout_marginTop="60dp" android:layout_gravity="center_horizontal" android:layout_width="200dp" android:layout_height="200dp" android:background="@drawable/welcome"/> <RelativeLayout android:layout_marginTop="50dp" android:layout_gravity="center_horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content"> <EditText android:id="@+id/username" android:lines="1" android:imeOptions="actionNext" android:paddingLeft="40dp" android:gravity="left|center" android:layout_width="200dp" android:layout_height="45dp" android:hint="用户名" android:textSize="16sp" android:textColor="@color/white"/> </RelativeLayout> <RelativeLayout android:layout_marginTop="20dp" android:layout_gravity="center_horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content"> <EditText android:id="@+id/password" android:lines="1" android:imeOptions="actionNext" android:paddingLeft="40dp" android:gravity="left|center" android:layout_width="200dp" android:layout_height="45dp" android:hint="密码" android:textSize="16sp" android:textColor="@color/white"/> </RelativeLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:layout_marginTop="20dp" android:orientation="horizontal"> <Button android:id="@+id/login_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="登陆" android:textColor="@color/white" android:textSize="18sp" android:gravity="center" /> <Button android:id="@+id/register_button" android:layout_marginLeft="80dp" android:text="注册" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@color/white" android:textSize="18sp" android:gravity="center" /> </LinearLayout> </LinearLayout>

MainActivity.java代码片.

package com.coolweather.login; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.text.TextUtils; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import org.w3c.dom.Text; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { private MyDatabaseHelper myDatabaseHelper; private Button btnLogin,btnRegister; private EditText etAccount,etPassword; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnLogin = findViewById(R.id.login_button); btnRegister = findViewById(R.id.register_button); etAccount = findViewById(R.id.username); etPassword = findViewById(R.id.password); btnRegister.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(MainActivity.this,RegisterActivity.class); startActivity(intent); finish(); } }); btnLogin.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String account = etAccount.getText().toString().trim(); String password = etPassword.getText().toString().trim(); if (!TextUtils.isEmpty(account) && !TextUtils.isEmpty(password)) { ArrayList<User> data = myDatabaseHelper.getAllDATA(); boolean userdata = false; for (int i = 0; i < data.size(); i++) { User user= data.get(i); //可存储账号数量 if (account.equals(user.getName()) && password.equals(user.getPassword())) { userdata = true; break; } else { userdata = false; } } if (userdata){ Toast.makeText(MainActivity.this,"登陆成功!",Toast.LENGTH_LONG).show(); Intent intent = new Intent(MainActivity.this,HomeActivity.class); startActivity(intent); finish(); } else{ Toast.makeText(MainActivity.this,"用户名或密码错误!",Toast.LENGTH_LONG).show(); } }else { Toast.makeText(MainActivity.this,"用户名或密码不能为空!",Toast.LENGTH_LONG).show(); } } }); myDatabaseHelper = new MyDatabaseHelper(MainActivity.this); } } 注册模块

RegisterActivity.java代码片.

package com.coolweather.login; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.text.TextUtils; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class RegisterActivity extends AppCompatActivity implements View.OnClickListener { private MyDatabaseHelper myDatabaseHelper; private Button btnRegister,btnBack; private EditText etAccount, etPass, etSex; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_register); etAccount = findViewById(R.id.register_username); etPass=findViewById(R.id.register_password); etSex=findViewById(R.id.register_sex); btnRegister=findViewById(R.id.register2_button); btnBack=findViewById(R.id.back_button); btnRegister.setOnClickListener(this); btnBack.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(RegisterActivity.this,MainActivity.class); startActivity(intent); finish(); } }); myDatabaseHelper = new MyDatabaseHelper(RegisterActivity.this); } @Override public void onClick(View v) { String name = etAccount.getText().toString().trim(); String pass = etPass.getText().toString().trim(); String sex = etSex.getText().toString().trim(); if(!TextUtils.isEmpty(name)&&!TextUtils.isEmpty(pass)&&!TextUtils.isEmpty(sex)){ myDatabaseHelper.add(name,pass,sex); Intent intent1 = new Intent(RegisterActivity.this,MainActivity.class); startActivity(intent1); finish(); Toast.makeText(RegisterActivity.this,"注册成功",Toast.LENGTH_SHORT).show(); }else {Toast.makeText(RegisterActivity.this,"信息不完备，注册失败",Toast.LENGTH_SHORT).show();} Toast.makeText(RegisterActivity.this,"注册成功!",Toast.LENGTH_LONG).show(); myDatabaseHelper.add(name,pass,sex); Intent intent = new Intent(RegisterActivity.this,MainActivity.class); startActivity(intent); finish(); } }

注册界面xml代码片.

<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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:layout_width="match_parent" android:layout_height="match_parent" tools:context=".RegisterActivity" android:orientation="vertical" android:background="@color/purple_200"> <TextView android:layout_marginTop="100dp" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:text="请准确输入信息" android:textColor="@color/white" android:textSize="30dp" android:gravity="center" /> <LinearLayout android:layout_marginTop="100dp" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <EditText android:id="@+id/register_username" android:layout_gravity="center" android:lines="1" android:imeOptions="actionNext" android:paddingLeft="40dp" android:gravity="left|center" android:layout_width="200dp" android:layout_height="45dp" android:hint="用户名" android:textSize="15sp" android:textColor="@color/white"/> <EditText android:id="@+id/register_password" android:layout_marginTop="20dp" android:layout_gravity="center" android:lines="1" android:imeOptions="actionNext" android:paddingLeft="40dp" android:gravity="left|center" android:layout_width="200dp" android:layout_height="45dp" android:hint="密码" android:textSize="15sp" android:textColor="@color/white"/> <EditText android:id="@+id/register_sex" android:layout_marginTop="20dp" android:layout_gravity="center" android:lines="1" android:imeOptions="actionNext" android:paddingLeft="40dp" android:gravity="left|center" android:layout_width="200dp" android:layout_height="45dp" android:hint="性别" android:textSize="15sp" android:textColor="@color/white"/> <Button android:id="@+id/register2_button" android:layout_gravity="center" android:layout_marginTop="20dp" android:text="注册" android:layout_width="200dp" android:layout_height="wrap_content" android:textColor="@color/white" android:textSize="18sp" android:gravity="center" /> <Button android:id="@+id/back_button" android:layout_gravity="center" android:layout_marginTop="20dp" android:text="返回" android:layout_width="200dp" android:layout_height="wrap_content" android:textColor="@color/white" android:textSize="18sp" android:gravity="center" /> </LinearLayout> </LinearLayout> 数据库模块

创建用户类 User.java代码片.

package com.coolweather.login; public class User { private int id; private String name; private String password; private String sex; public User(String name, String password, String sex){ super(); this.name = name; this.password = password; this.sex = sex; } public int getId() {return id;} public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getSex(){return sex;} public void setSex(String sex){this.sex = sex;} @Override public String toString() { return "User{id ="+ id + ", name = "+ name +",password ="+password +",sex ="+sex +"}"; } }

使用数据库创建MyDatabaseHelper，创建用户表 MyDatabaseHelper.java代码片.

public class MyDatabaseHelper extends SQLiteOpenHelper { private SQLiteDatabase db; public static final String CREATE_User = "create table user (" + "_id INTEGER PRIMARY KEY AUTOINCREMENT, " + "name TEXT, " + "password TEXT," + "sex TEXT)"; public MyDatabaseHelper(@Nullable Context context) { super(context, "db_test", null, 1); db = getReadableDatabase(); } 去除顶部标题

去theres.xml文件中更改,如下代码片.

主要介绍注册模块，登录模块，数据库模块。使用了本地的sqlite数据库保存用户数据，实现用户注册，可以联系讨论，完整源码有偿。