Android Studio连接SQLite数据库的登录注册实现

1、先看一下项目目录：

2、新建一个AS项目，创建如上图所示的目录结构，然后添加内容：

（1）修改添加布局文件：

activity_main.xml：

<?xml version='1.0' encoding='utf-8'?><android.support.constraint.ConstraintLayout 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='.LoginActivity'><LinearLayout android:layout_width='match_parent' android:layout_height='match_parent' android:orientation='vertical'> <TextView android:layout_width='match_parent' android:layout_height='wrap_content' android:layout_gravity='center' android:gravity='center' android:text='欢迎进入登录界面!' android:textSize='30dp' android:textStyle='bold' /> <TableLayout android:layout_width='match_parent' android:layout_height='wrap_content' android:stretchColumns='1' > <TableRow> <TextViewandroid:layout_width='wrap_content'android:layout_height='wrap_content'android:layout_gravity='center'android:text='用户名：' /> <EditTextandroid: android:layout_width='fill_parent'android:layout_height='wrap_content'android:hint='请输入用户名！！！' /> </TableRow> <TableRow> <TextViewandroid:layout_width='wrap_content'android:layout_height='wrap_content'android:layout_gravity='center'android:text='密码：' /> <EditTextandroid: android:layout_width='fill_parent'android:layout_height='wrap_content'android:hint='请输入密码！！！' /> </TableRow> <TableRow> <TextView /> <LinearLayout><Button android: android:layout_width='100dp' android:layout_height='wrap_content' android:text='登录' /><Button android: android:layout_width='100dp' android:layout_height='wrap_content' android:text='注册' /> </LinearLayout> </TableRow> </TableLayout></LinearLayout></android.support.constraint.ConstraintLayout>

activity_register.xml：

<?xml version='1.0' encoding='utf-8'?><android.support.constraint.ConstraintLayout 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'><LinearLayout android:layout_width='match_parent' android:layout_height='match_parent' android:orientation='vertical'> <TextView android:layout_width='fill_parent' android:layout_height='wrap_content' android:layout_gravity='center' android:gravity='center' android:text='欢迎进入注册界面!' android:textSize='30dp' android:textStyle='bold' /> <TableLayout android:layout_width='fill_parent' android:layout_height='wrap_content' android:stretchColumns='1' > <TableRow > <TextViewandroid:layout_width='wrap_content'android:layout_height='wrap_content'android:layout_gravity='center'android:text='用户名：' /> <EditTextandroid: android:layout_width='fill_parent'android:layout_height='wrap_content'android:hint='请输入用户名！！！' /> </TableRow> <TableRow > <TextViewandroid:layout_width='wrap_content'android:layout_height='wrap_content'android:layout_gravity='center'android:text='密码：' /> <EditTextandroid: android:layout_width='fill_parent'android:layout_height='wrap_content'android:hint='请输入密码！！！' /> </TableRow> <TableRow > <TextViewandroid:layout_width='wrap_content'android:layout_height='wrap_content'android:layout_gravity='center'android:text='年龄：' /> <EditTextandroid: android:layout_width='fill_parent'android:layout_height='wrap_content'android:hint='请输入年龄！！！' /> </TableRow> <TableRow > <TextViewandroid:layout_width='wrap_content'android:layout_height='wrap_content'android:layout_gravity='center'android:text='性别：'android:textSize='20dp' /> <RadioGroupandroid: android:layout_width='fill_parent'android:layout_height='wrap_content'android:checkedButton='@+id/woman'android:orientation='horizontal' ><RadioButton android: android:text='男' android:layout_height='wrap_content' android:layout_width='wrap_content' /><RadioButton android: android:text='女' android:layout_height='wrap_content' android:layout_width='wrap_content'/> </RadioGroup> </TableRow> <TableRow > <TextView /> <LinearLayout ><Button android: android:layout_width='150dp' android:layout_height='wrap_content' android:text='注册' /> </LinearLayout> </TableRow> </TableLayout></LinearLayout></android.support.constraint.ConstraintLayout>

（2）在service包DatabaseHelper中添加链接AS自带数据库以及创建表的语句：

package com.example.sqlitelogin.service;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteDatabase.CursorFactory;import android.database.sqlite.SQLiteOpenHelper;public class DatabaseHelper extends SQLiteOpenHelper {static String name='user.db';static int dbVersion=1;public DatabaseHelper(Context context) {super(context, name, null, dbVersion);}public void onCreate(SQLiteDatabase db) {String sql='create table user(id integer primary key autoincrement,username varchar(20),password varchar(20),age integer,sex varchar(2))';db.execSQL(sql);}public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}}

（3）在service包UserService中用sql语句写登录注册功能的实现：

package com.example.sqlitelogin.service;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import com.example.sqlitelogin.User;public class UserService {private DatabaseHelper dbHelper;public UserService(Context context){dbHelper=new DatabaseHelper(context);}public boolean login(String username,String password){SQLiteDatabase sdb=dbHelper.getReadableDatabase();String sql='select * from user where username=? and password=?';Cursor cursor=sdb.rawQuery(sql, new String[]{username,password});if(cursor.moveToFirst()==true){cursor.close();return true;}return false;}public boolean register(User user){SQLiteDatabase sdb=dbHelper.getReadableDatabase();String sql='insert into user(username,password,age,sex) values(?,?,?,?)';Object obj[]={user.getUsername(),user.getPassword(),user.getAge(),user.getSex()};sdb.execSQL(sql, obj);return true;}}

（4）在User文件中声明要用到的表列名的变量，并对其添加get&&set方法：

package com.example.sqlitelogin;import java.io.Serializable;public class User implements Serializable{ private int id; private String username; private String password; private int age; private String sex; public User() { super(); // TODO Auto-generated constructor stub } public User(String username, String password, int age, String sex) { super(); this.username = username; this.password = password; this.age = age; this.sex = sex; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } @Override public String toString() { return 'User [id=' + id + ', username=' + username + ', password='+ password + ', age=' + age + ', sex=' + sex + ']'; }}

（5）为注册功能添加activity组件：

package com.example.sqlitelogin;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.Toast;import com.example.sqlitelogin.service.UserService;public class RegisterActivity extends AppCompatActivity { EditText username; EditText password; EditText age; RadioGroup sex; Button register; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_register); findViews(); register.setOnClickListener(new View.OnClickListener() { public void onClick(View v) {String name=username.getText().toString().trim();String pass=password.getText().toString().trim();String agestr=age.getText().toString().trim();String sexstr=((RadioButton)RegisterActivity.this.findViewById(sex.getCheckedRadioButtonId())).getText().toString();Log.i('TAG',name+'_'+pass+'_'+agestr+'_'+sexstr);UserService uService=new UserService(RegisterActivity.this);User user=new User();user.setUsername(name);user.setPassword(pass);user.setAge(Integer.parseInt(agestr));user.setSex(sexstr);uService.register(user);Toast.makeText(RegisterActivity.this, '注册成功', Toast.LENGTH_LONG).show(); } }); } private void findViews() { username=(EditText) findViewById(R.id.usernameRegister); password=(EditText) findViewById(R.id.passwordRegister); age=(EditText) findViewById(R.id.ageRegister); sex=(RadioGroup) findViewById(R.id.sexRegister); register=(Button) findViewById(R.id.Register); }}

（6）为登录功能添加activity组件：

package com.example.sqlitelogin;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import com.example.sqlitelogin.service.UserService;public class LoginActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);//即activity_login.xml findViews(); } private EditText username; private EditText password; private Button login; private Button register; private void findViews() { username=(EditText) findViewById(R.id.username); password=(EditText) findViewById(R.id.password); login=(Button) findViewById(R.id.login); register=(Button) findViewById(R.id.register); login.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) {String name=username.getText().toString();System.out.println(name);String pass=password.getText().toString();System.out.println(pass);Log.i('TAG',name+'_'+pass);UserService uService=new UserService(LoginActivity.this);boolean flag=uService.login(name, pass);if(flag){ Log.i('TAG','登录成功'); Toast.makeText(LoginActivity.this, '登录成功', Toast.LENGTH_LONG).show(); Intent intent = new Intent(LoginActivity.this,RegisterActivity.class); startActivity(intent);}else{ Log.i('TAG','登录失败'); Toast.makeText(LoginActivity.this, '登录失败', Toast.LENGTH_LONG).show();} } }); register.setOnClickListener(new View.OnClickListener() { public void onClick(View v) {Intent intent=new Intent(LoginActivity.this,RegisterActivity.class);startActivity(intent); } }); }}

3、Androidmanifest.xml清单文件中，程序运行必备的内容一般都已经自动完成添加了。也可以进行修改：

<?xml version='1.0' encoding='utf-8'?><manifest xmlns:android='http://schemas.android.com/apk/res/android' package='com.example.sqlitelogin'> <application android:allowBackup='true' android:icon='@mipmap/ic_launcher' android:label='@string/app_name' android:roundIcon='@mipmap/ic_launcher_round' android:supportsRtl='true' android:theme='@style/AppTheme'> <activity android:name='.RegisterActivity'> <!--<intent-filter>--><!--<action android:name='android.intent.action.MAIN' />--><!--<category android:name='android.intent.category.LAUNCHER' />--> <!--</intent-filter>--> </activity> <activity android:name='.LoginActivity'> <intent-filter><action android:name='android.intent.action.MAIN'/><category android:name='android.intent.category.LAUNCHER'/> </intent-filter> </activity> <!--<uses-library android:name='android.test.runner'/>--> </application></manifest>

4、在模拟器或者真机运行程序，即可！一个连接数据库的登录注册功能已经实现，效果如下：

补：

如果登录、注册的两个布局文件的 Preview 视图标红，将 android.support.constraint.ConstraintLayout 替换为 LinearLayout 即可

源码下载：

点击查看

查看创建的数据库以及插入的表数据：

点击查看

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