Android 使用sqlite 进行登录注册
import引入的需要改为调用自己jar包
直接上代码
MainActivity.java(即LoginActivity.java)
package com.example.treasure; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import com.example.treasure.MainActivity; import com.example.treasure.MActivity; import com.example.treasure.database.UserService; public class MainActivity extends Activity { private Button enter=null; private Button btnlogin=null; private Button btnregister=null; private EditText username=null; private EditText passtext=null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btnlogin = (Button)findViewById(R.id.btnlogin); btnregister = (Button)findViewById(R.id.btnregister); username = (EditText)findViewById(R.id.username); passtext = (EditText)findViewById(R.id.passtext); enter=(Button)findViewById(R.id.enter); enter.setOnClickListener(listener); btnlogin.setOnClickListener(listener); btnregister.setOnClickListener(listener); } private OnClickListener listener=new OnClickListener() { public void onClick(View v) { Button btn=(Button)v; switch (btn.getId()) { case R.id.enter: Toast.makeText(MainActivity.this, "想要获取更多的实用信息,请注册登录吧", Toast.LENGTH_LONG).show(); Intent intent11=new Intent(); intent11.setClass(MainActivity.this,Lyb_Activity.class); startActivity(intent11); break; case R.id.btnlogin: String name=username.getText().toString(); String pass=passtext.getText().toString(); Log.i("TAG",name+"_"+pass); UserService uService=new UserService(MainActivity.this); boolean flag=uService.login(name, pass); if(flag){ Log.i("TAG","登录成功"); Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_LONG).show(); Intent intent15=new Intent(); intent15.setClass(MainActivity.this,MActivity.class); startActivity(intent15); }else{ Log.i("TAG","登录失败"); Toast.makeText(MainActivity.this, "登录失败", Toast.LENGTH_LONG).show(); } break; case R.id.btnregister: Intent intent011=new Intent(); intent011.setClass(MainActivity.this,RegisterActivity.class); startActivity(intent011); break; } } }; }
package com.example.treasure; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.Toast; import com.example.treasure.database.User; import com.example.treasure.database.UserService; public class RegisterActivity extends Activity { EditText username; EditText password; EditText age; RadioGroup sex; Button register; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.register); findViews(); register.setOnClickListener(new 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); } }
package com.example.treasure.database; 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); } //只在创建的时候用一次 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) { } }UserService.java
package com.example.treasure.database; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import com.example.treasure.database.User; public class UserService { private DatabaseHelper dbHelper; public UserService(Context context){ dbHelper=new DatabaseHelper(context); } //登录用 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; } //注册用 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; } }
package com.example.treasure.database; 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 + "]"; } }
package com.example.treasure.database; import android.test.AndroidTestCase; import android.util.Log; import com.example.treasure.database.User; import com.example.treasure.database.DatabaseHelper; import com.example.treasure.database.UserService; public class UserTest extends AndroidTestCase { public void datatest() throws Throwable{ DatabaseHelper dbhepler=new DatabaseHelper(this.getContext()); dbhepler.getReadableDatabase(); } //注册 public void registerTest() throws Throwable{ UserService uService=new UserService(this.getContext()); User user=new User(); user.setUsername("renhaili"); user.setPassword("123"); user.setAge(20); user.setSex("女"); uService.register(user); } public void loginTest() throws Throwable{ UserService uService=new UserService(this.getContext()); String username="renhaili"; String password="123"; boolean flag=uService.login(username, password); if(flag){ Log.i("TAG","登录成功"); }else{ Log.i("TAG","登录失败"); } } }main.xml(即login.xml)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" android:background="@drawable/background"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="treasure\n\n" android:id="@+id/title" android:textSize="25sp" android:gravity="center"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="用户:" android:layout_marginBottom="25dp" android:id="@+id/user" android:layout_toLeftOf="@+id/passtext" android:layout_below="@id/title"/> <EditText android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/username" android:layout_alignBottom="@id/user" android:layout_toRightOf="@id/user" android:hint="username"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="密码:" android:id="@+id/pass" android:layout_alignBottom="@id/passtext"/> <EditText android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/passtext" android:layout_below="@id/username" android:layout_toRightOf="@id/pass" android:hint="password"/> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="\n" android:id="@+id/title1" android:textSize="25sp" android:gravity="center" android:layout_below="@id/passtext"/> <Button android:layout_height="wrap_content" android:layout_width="fill_parent" android:id="@+id/btnlogin" android:background="#FF0000" android:layout_below="@id/title1" android:layout_marginBottom="30dp" android:text="登录" android:layout_centerHorizontal="true"/> <Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/enter" android:layout_below="@id/btnlogin" android:text="游客入口" android:textColor="#FF0000" android:layout_marginLeft="80dp"/> <Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/btnregister" android:layout_below="@id/btnlogin" android:text="注册" android:textColor="#FF0000" android:layout_toRightOf="@id/enter"/> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_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" /> <RadioButton android:id="@id/woman" android:text="女" /> </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>