Android studio登陆注册的实现及介绍
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.
<style name="Theme.Login" parent="Theme.MaterialComponents.DayNight.NoActionBar">
总结与补充
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。