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> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="用户名:" /> <EditText android:id="@+id/username" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="请输入用户名!!!" /> </TableRow> <TableRow> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="密码:" /> <EditText android:id="@+id/password" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="请输入密码!!!" /> </TableRow> <TableRow> <TextView /> <LinearLayout> <Button android:id="@+id/login" android:layout_width="100dp" android:layout_height="wrap_content" android:text="登录" /> <Button android:id="@+id/register" 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 > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="用户名:" /> <EditText android:id="@+id/usernameRegister" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="请输入用户名!!!" /> </TableRow> <TableRow > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="密码:" /> <EditText android:id="@+id/passwordRegister" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="请输入密码!!!" /> </TableRow> <TableRow > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="年龄:" /> <EditText android:id="@+id/ageRegister" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="请输入年龄!!!" /> </TableRow> <TableRow > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="性别:" android:textSize="20dp" /> <RadioGroup android:id="@+id/sexRegister" android:layout_width="fill_parent" android:layout_height="wrap_content" android:checkedButton="@+id/woman" android:orientation="horizontal" > <RadioButton android:id="@+id/nan" android:text="男" android:layout_height="wrap_content" android:layout_width="wrap_content" /> <RadioButton android:id="@id/woman" android:text="女" android:layout_height="wrap_content" android:layout_width="wrap_content"/> </RadioGroup> </TableRow> <TableRow > <TextView /> <LinearLayout > <Button android:id="@+id/Register" 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:
查看创建的数据库以及插入的表数据:
点击查看
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