android之SQLite的使用实现登陆注册功能。
首先项目结构图：
接下来布局：
（1）activit_main.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" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="用户登录" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/textView1" android:layout_marginTop="38dp" android:text="用户名：" /> <EditText android:id="@+id/username" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/textView2" android:layout_toRightOf="@+id/textView2" android:ems="10" /> <TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/textView2" android:layout_marginTop="36dp" android:text="密码：" /> <EditText android:id="@+id/password" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/textView3" android:layout_alignLeft="@+id/username" android:ems="10" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/password" android:layout_below="@+id/password" android:layout_marginLeft="24dp" android:layout_marginTop="36dp" android:text="登录" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/button1" android:layout_marginLeft="20dp" android:layout_toRightOf="@+id/button1" android:text="注册" /> </RelativeLayout>
（2） activity_register.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" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="用户注册" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/textView1" android:layout_marginTop="38dp" android:text="用户名：" /> <EditText android:id="@+id/username" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/textView2" android:layout_toRightOf="@+id/textView2" android:ems="10" /> <TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/textView2" android:layout_marginTop="36dp" android:text="密码：" /> <EditText android:id="@+id/password" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/textView3" android:layout_alignLeft="@+id/username" android:ems="10" /> <Button android:id="@+id/register" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/password" android:layout_centerHorizontal="true" android:layout_marginTop="118dp" android:text="注册" /> <TextView android:id="@+id/textView4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView3" android:layout_below="@+id/textView3" android:layout_marginTop="35dp" android:text="性别：" /> <EditText android:id="@+id/sex" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/textView4" android:layout_alignLeft="@+id/password" android:ems="10" > </EditText> <TextView android:id="@+id/textView5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView4" android:layout_centerVertical="true" android:text="年龄:" /> <EditText android:id="@+id/age" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_toRightOf="@+id/textView2" android:ems="10" /> </RelativeLayout>
下来是java代码：
（1）User.java
package com.lihua.domain;
/**
* 实体类
* @author Lihua
*
*/
public class User {
private int id;
private String username;
private String password;
private String sex;
private int age;
public User() {
super();
}
public User(int id, String username, String password, String sex, int age) {
super();
this.id = id;
this.username = username;
this.password = password;
this.sex = sex;
this.age = age;
}
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 String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
（2）DbHelper.java
package com.lihua.tools;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DbHelper extends SQLiteOpenHelper {
private final static String NAME = "user.db";
private final static int VERSION = 1;
public DbHelper(Context context) {
super(context, NAME, null, VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql = "create table user (id integer primary key autoincrement,username varchar(64),password varchar(64),sex varchar(64),age integer)";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
}
}
（3）UserService.java
package com.lihua.service;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import com.lihua.domain.User;
import com.lihua.tools.DbHelper;
/**
* 服务类
* @author student
*
*/
public class UserService {
private DbHelper dbHelper;
public UserService(Context context) {
dbHelper = new DbHelper(context);
}
/**
* 用户登录
*
* @param username
* @param password
* @return
*/
public boolean Login(String username, String password) {
SQLiteDatabase sqLiteDatabase = dbHelper.getReadableDatabase();
String sql = "select * from user where username = ? and password = ? ";
Cursor rawQuery = sqLiteDatabase.rawQuery(sql, new String[] { username,
password });
if (rawQuery.moveToFirst() == true) {
rawQuery.close();
return true;
}
return false;
}
/**
* 用户注册
*
* @param user
* @return
*/
public boolean Register(User user) {
SQLiteDatabase sqLiteDatabase = dbHelper.getReadableDatabase();
String sql = "insert into user (username,password,sex,age) values (?,?,?,?)";
Object obj[] = { user.getUsername(), user.getPassword(), user.getSex(),
user.getAge() };
sqLiteDatabase.execSQL(sql, obj);
return true;
}
}
（4）MainActivity.java
package com.lihua.activity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.example.gj.R;
import com.lihua.service.UserService;
/**
* 入口
*
* @author Lihua
*
*/
public class MainActivity extends Activity {
// 分别为用户名和密码
private EditText mUsername;
private EditText mPassword;
// 分别为登陆和注册按钮
private Button mLogin;
private Button mRegister;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mUsername = (EditText) findViewById(R.id.username);
mPassword = (EditText) findViewById(R.id.password);
mLogin = (Button) findViewById(R.id.button1);
mRegister = (Button) findViewById(R.id.button2);
// 登陆
mLogin.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
String userName = mUsername.getText().toString().trim();
String passWord = mPassword.getText().toString().trim();
UserService userService = new UserService(MainActivity.this);
boolean flag = userService.Login(userName, passWord);
if (flag) {
Toast.makeText(MainActivity.this, "登录成功！",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "登录失败！",
Toast.LENGTH_SHORT).show();
}
}
});
// 注册
mRegister.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent();
intent.setClass(MainActivity.this, RegisterActivity.class);
startActivity(intent);
}
});
}
}
（5）RegisterActivity.java
package com.lihua.activity;
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.Toast;
import com.example.gj.R;
import com.lihua.domain.User;
import com.lihua.service.UserService;
/**
* 注册类
* @author Lihua
*
*/
public class RegisterActivity extends Activity {
private EditText mUsername;
private EditText mPassword;
private EditText mSex;
private EditText mAge;
private Button mRegister;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
mUsername = (EditText)findViewById(R.id.username);
mPassword = (EditText)findViewById(R.id.password);
mSex = (EditText)findViewById(R.id.sex);
mAge = (EditText)findViewById(R.id.age);
mRegister = (Button)findViewById(R.id.register);
mRegister.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
String userName = mUsername.getText().toString().trim();
String passWord = mPassword.getText().toString().trim();
String Sex = mSex.getText().toString().trim();
int Age = Integer.parseInt(mAge.getText().toString().trim());
Log.i("TAG", userName);
Log.i("TAG", passWord);
Log.i("TAG", Sex);
User user = new User();
user.setUsername(userName);
user.setPassword(passWord);
user.setSex(Sex);
user.setAge(Age);
System.out.println(user.getUsername());
System.out.println(user.getPassword());
System.out.println(user.getSex());
System.out.println(user.getAge());
UserService userService = new UserService(getBaseContext());
boolean flag = userService.Register(user);
if (flag) {
Toast.makeText(RegisterActivity.this, "注册成功", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(RegisterActivity.this, "注册失败", Toast.LENGTH_SHORT).show();
}
}
});
}
}
Activity注册：
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.gj" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.lihua.activity.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="com.lihua.activity.RegisterActivity" > </activity> </application> </manifest>
效果图：
（1）登陆界面：
（2）注册界面：
源码下载：http://pan.baidu.com/s/1jG5MIxS