Android程序开发之数据存储（一）： 使用sqlite 进行登录注册
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;
}
}
};
}
RegisterActivity.java
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);
}
}
数据库辅助函数DatabaseHelper.java
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;
}
}
User.java
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 + "]";
}
}
UserTest.java
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>
register.xml
<?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>