Android基于Sqlite实现注册和登录功能
Android中基于Sqlite实现注册和登录功能,供大家参考,具体内容如下
前言
写这篇博客主要是为了巩固一下学的Sqlite知识以及梳理一下这个项目的逻辑
实现逻辑
项目的图片结构图如下
代码
user class
public class User { private String name; //用户名 private String password; //密码 public User(String name, String password) { this.name = name; this.password = password; } 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; } }
DBOpenHelper class
import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import java.util.ArrayList; public class DBOpenHelper extends SQLiteOpenHelper { private SQLiteDatabase db; public DBOpenHelper(Context context){//打开数据库 super(context,"db_test",null,1);//1:上下文,2:数据库名,3:允许我们查询数据时返回一个Cursor,4:当前数据库的版本号 db = getReadableDatabase(); } @Override public void onCreate(SQLiteDatabase db){//建表(user)语句 db.execSQL("CREATE TABLE IF NOT EXISTS user(" +//PRIMARY key 将id设为主键 ,AUTOINCREMENT 设置id列自为增长 "_id INTEGER PRIMARY KEY AUTOINCREMENT," + "name TEXT," + //text 文本类型 "password TEXT)"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){//重写升级 db.execSQL("DROP TABLE IF EXISTS user"); onCreate(db); } public void add(String name,String password){//重写添加 db.execSQL("INSERT INTO user (name,password) VALUES(?,?)",new Object[]{name,password}); } public void delete(String name,String password){//重写删除 db.execSQL("DELETE FROM user WHERE name = AND password ="+name+password); } public void updata(String password){//重写更新 db.execSQL("UPDATE user SET password = ?",new Object[]{password}); } public ArrayList<User> getAllData(){//将表内信息返回成一个list ArrayList<User> list = new ArrayList<User>(); Cursor cursor = db.query("user",null,null,null,null,null,"name DESC");//1表名,2列,3行,4行,5指定列进行过滤,6进一步过滤。7得到的信息进行排序(desc逆序) while(cursor.moveToNext()){//一行一行遍历 String name = cursor.getString(cursor.getColumnIndex("name"));//移动到name列,读取出来 String password = cursor.getString(cursor.getColumnIndex("password")); list.add(new User(name,password));//添加到user 的list中 } return list;//把list返回 } }
activity_login.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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="#eeeeee" tools:context=".LoginActivity"> <RelativeLayout android:id="@+id/rl_loginactivity_top" android:layout_width="match_parent" android:layout_height="70dp" > <ImageView android:id="@+id/iv_loginactivity_back" android:layout_width="30dp" android:layout_height="30dp" android:layout_alignParentTop="true" android:layout_marginLeft="10dp" android:layout_marginTop="20dp" android:clickable="true" /> <TextView android:id="@+id/tv_loginactivity_login" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="登录" android:textColor="#3A5FCD" android:textSize="20dp" android:layout_toRightOf="@+id/iv_loginactivity_back" android:layout_centerVertical="true" android:layout_alignParentLeft="true" android:layout_marginLeft="30dp" /> <TextView android:id="@+id/tv_loginactivity_register" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="注册" android:textColor="#3A5FCD" android:textSize="20dp" android:layout_centerVertical="true" android:layout_alignParentRight="true" android:layout_marginRight="30dp" android:clickable="true" android:onClick="onClick" /> </RelativeLayout> <LinearLayout android:id="@+id/ll_loginactivity_two" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:layout_below="@+id/rl_loginactivity_top" android:layout_marginTop="10dp" android:layout_marginLeft="5dp" android:layout_marginRight="5dp" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/tv_loginactivity_username" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="用户名:"/> <EditText android:id="@+id/et_loginactivity_username" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="手机号/邮箱/用户名"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/tv_loginactivity_password" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="密 码:"/> <EditText android:id="@+id/et_loginactivity_password" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="登录密码" android:inputType="textPassword"/> </LinearLayout> </LinearLayout> <Button android:id="@+id/bt_loginactivity_login" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/ll_loginactivity_two" android:layout_marginTop="10dp" android:layout_marginLeft="5dp" android:layout_marginRight="5dp" android:text="登录" android:textColor="#3A5FCD" android:gravity="center" android:onClick="onClick" /> </RelativeLayout>
LoginActivity
import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.content.Intent; import android.text.TextUtils; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; public class LoginActivity extends AppCompatActivity implements View.OnClickListener { private DBOpenHelper mDBOpenHelper; private EditText mEtLoginactivityUsername; private EditText mEtLoginactivityPassword; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); initView(); mDBOpenHelper = new DBOpenHelper(this); } private void initView() { // 初始化控件 mEtLoginactivityUsername = findViewById(R.id.et_loginactivity_username); mEtLoginactivityPassword = findViewById(R.id.et_loginactivity_password); // 设置点击事件监听器 } public void onClick(View view) { switch (view.getId()) { // 跳转到注册界面 case R.id.tv_loginactivity_register: startActivity(new Intent(this, RegisterActivity.class)); finish(); break; case R.id.bt_loginactivity_login: String name = mEtLoginactivityUsername.getText().toString().trim();//.trim()删除两边的空格 String password = mEtLoginactivityPassword.getText().toString().trim(); if (!TextUtils.isEmpty(name) && !TextUtils.isEmpty(password)) {//TextUtils.isEmpty()输入框是空值或者你就敲了几下空格键该方法都会返回true ArrayList<User> data = mDBOpenHelper.getAllData();//data为获取的user表内的user信息 boolean match = false; for (int i = 0; i < data.size(); i++) {//遍历比较 User user = data.get(i);//获取data里的第i个user信息 if (name.equals(user.getName()) && password.equals(user.getPassword())) {//将信息与输入的信息进行对比 match = true; break; } else { match = false; } } if (match) { Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show(); Intent intent = new Intent(this, MainActivity.class); startActivity(intent); finish();//销毁此Activity } else { Toast.makeText(this, "用户名或密码不正确,请重新输入", Toast.LENGTH_SHORT).show(); } } else { Toast.makeText(this, "请输入你的用户名或密码", Toast.LENGTH_SHORT).show(); } break; } } }
activity_register.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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="#eeeeee" tools:context=".RegisterActivity"> <RelativeLayout android:id="@+id/rl_registeractivity_top" android:layout_width="match_parent" android:layout_height="70dp" > <ImageView android:id="@+id/iv_registeractivity_back" android:layout_width="30dp" android:layout_height="30dp" android:layout_centerVertical="true" android:layout_marginLeft="10dp" android:clickable="true" /> <TextView android:id="@+id/tv_registeractivity_register" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="注册" android:textColor="#3A5FCD" android:textSize="20dp" android:layout_centerVertical="true" android:layout_marginLeft="20dp" /> </RelativeLayout> <LinearLayout android:id="@+id/ll_registeractivity_body" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:layout_below="@+id/rl_registeractivity_top" android:layout_marginTop="10dp" android:layout_marginLeft="5dp" android:layout_marginRight="5dp" > <!-- 第一个文本编辑框 输入用户名 --> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/tv_registeractivity_username" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="用户名:"/> <EditText android:id="@+id/et_registeractivity_username" android:layout_width="match_parent" android:layout_height="50dp" android:hint="请输入用户名" android:gravity="center_vertical" android:layout_marginLeft="10dp" /> </LinearLayout> <!-- 第二个文本编辑框 输入密码 --> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/tv_registeractivity_password1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="密 码:"/> <EditText android:id="@+id/et_registeractivity_password" android:layout_width="match_parent" android:layout_height="50dp" android:gravity="center_vertical" android:layout_marginLeft="10dp" android:inputType="textPassword" android:hint="请输入密码" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginRight="15dp" android:layout_marginTop="10dp" android:orientation="horizontal" /> <!-- 注册按钮 --> <Button android:id="@+id/bt_registeractivity_register" android:layout_width="match_parent" android:layout_height="50dp" android:layout_marginLeft="5dp" android:textColor="#3A5FCD" android:text="注册" android:layout_marginTop="40dp" android:onClick="onClick" /> </LinearLayout> </RelativeLayout>
RegisterActivity
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.ImageView; import android.widget.LinearLayout; import android.widget.RelativeLayout; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; public class RegisterActivity extends AppCompatActivity implements View.OnClickListener { private DBOpenHelper mDBOpenHelper; private Button mBtRegisteractivityRegister; private ImageView mIvRegisteractivityBack; private EditText mEtRegisteractivityUsername; private EditText mEtRegisteractivityPassword; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_register); initView(); mDBOpenHelper = new DBOpenHelper(this); } private void initView(){ mEtRegisteractivityUsername = findViewById(R.id.et_registeractivity_username); mEtRegisteractivityPassword = findViewById(R.id.et_registeractivity_password); } public void onClick(View view) { switch (view.getId()) { case R.id.iv_registeractivity_back: //返回登录页面 Intent intent1 = new Intent(this, LoginActivity.class); startActivity(intent1); finish(); break; case R.id.bt_registeractivity_register: //注册按钮 //获取用户输入的用户名、密码、验证码 String username = mEtRegisteractivityUsername.getText().toString().trim(); String password = mEtRegisteractivityPassword.getText().toString().trim(); //注册验证 if (!TextUtils.isEmpty(username) && !TextUtils.isEmpty(password)) { mDBOpenHelper.add(username, password);//将用户名和密码加入到数据库的表内中 Intent intent2 = new Intent(this, LoginActivity.class); startActivity(intent2); finish(); Toast.makeText(this, "验证通过,注册成功", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(this, "未完善信息,注册失败", Toast.LENGTH_SHORT).show(); } break; } } }
实现效果
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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