本篇内容主要讲解“Android基于Sqlite怎么实现注册和登录功能”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Android基于Sqlite怎么实现注册和登录功能”吧!
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
到此，相信大家对“Android基于Sqlite怎么实现注册和登录功能”有了更深的了解，不妨来实际操作一番吧！这里是编程网网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
