我是一个初学者,我想只允许一个用户根据我的项目需求进行注册。 SIGNUP.java旨在使用DbHelper.java完成它,但事情正常 c.getCount() 但不是 的Integer.parseInt(c.getString(0))
SIGNUP.java读取:
package com.bishal.android.taskmanager;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class SIGNUP extends Activity {
Button register;
private EditText etName;
private EditText etEmail;
//private EditText etUsername;
private EditText etPassword;
private DbHelper dbhelper;
AlertDialogManager alert = new AlertDialogManager();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.signup);
dbhelper=new DbHelper(this);
etName=(EditText)findViewById(R.id.edit_name);
etEmail=(EditText)findViewById(R.id.edit_email);
etPassword=(EditText)findViewById(R.id.edit_signup_password);
register=(Button)findViewById(R.id.signup);
final boolean bregister=(dbhelper.NoOfUser()==0)?true:false;
register.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
//String UserNameValue=etUsername.getText().toString();
String NameValue=etName.getText().toString();
String EmailValue=etEmail.getText().toString();
String PasswordValue=etPassword.getText().toString();
//Toast.makeText(SIGNUP.this,dbhelper.ThereIsUser(), Toast.LENGTH_LONG).show();
if (bregister){
ACCOUNT_INFO account=new ACCOUNT_INFO(NameValue,EmailValue,PasswordValue);
if(NameValue.trim().length()>0 && EmailValue.trim().length() > 0 && PasswordValue.trim().length() >0){
if(dbhelper.eMailValidation(EmailValue)){
if(dbhelper.validateregister(EmailValue)){
dbhelper.addAccount(account);
Toast.makeText(SIGNUP.this, "Your account has been sucessfully created.", Toast.LENGTH_LONG).show();
}
else{
alert.showAlertDialog(SIGNUP.this, "Signup failed..", "Username/Email already exists.", false);
}
}
else{
alert.showAlertDialog(SIGNUP.this,"Signup failed..", "Email address is not in such form.", false);
}
}
else{
alert.showAlertDialog(SIGNUP.this, "Signup failed..", "Please enter empty fields.", false);
}
}
}
});
}
}
DbHelper.java读取(为什么'count'不作为表中行数的计数返回?):
package com.bishal.android.taskmanager;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
//import android.widget.Toast;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class DbHelper extends SQLiteOpenHelper{
private static final String TAG=DbHelper.class.getSimpleName();
public static final String DB_NAME="Store Account.db";
public static final int DB_VERSION=1;
public static final String TABLE="Account_Info";
public static final String COL_ID="Id"; //special for ID
public static final String COL_NAME="Name";
public static final String COL_EMAIL="Email";
//public static final String COL_UNAME="Username";
public static final String COL_PASSWORD="Password";
public DbHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
String CREATE_ACCOUNT_INFORMATION = "CREATE TABLE " + TABLE + "("
+ COL_ID + " INTEGER PRIMARY KEY," + COL_NAME + " String,"
+ COL_EMAIL + " String," + COL_PASSWORD + " String" + ")";
Log.d(TAG, "onCreate sql: "+CREATE_ACCOUNT_INFORMATION);
db.execSQL(CREATE_ACCOUNT_INFORMATION);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("Drop Table If Exists " + TABLE);
Log.d(TAG,"onUpdate dropped table "+ TABLE);
onCreate(db);
}
void addAccount(ACCOUNT_INFO account){
SQLiteDatabase db=this.getWritableDatabase();
ContentValues values=new ContentValues();
values.put(COL_NAME,account.getNAME());
values.put(COL_EMAIL,account.getEMAIL());
//values.put(COL_UNAME, account.getUSERNAME());
values.put(COL_PASSWORD, account.getPASSWORD());
db.insert(TABLE, null, values);
db.close();
}
public boolean validateuser(String email,String password){
Cursor c=getReadableDatabase().rawQuery("SELECT * FROM " + TABLE + " WHERE "
+ COL_EMAIL + "='" + email +"'AND "+COL_PASSWORD+"='" + password+"'" , null);
if(c.getCount()>0)
return true;
else
return false;
}
public boolean validateregister(String email){
Cursor c=getReadableDatabase().rawQuery("SELECT * FROM " + TABLE + " WHERE "
+ COL_EMAIL + "='" + email+"'" , null);
if(c.getCount()>0)
return false;
else
return true;
}
public boolean eMailValidation(String emailValue) {
final String EMAIL_PATTERN =
"^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
+ "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
Pattern pattern=Pattern.compile(EMAIL_PATTERN);;
Matcher matcher;
matcher = pattern.matcher(emailValue);
return matcher.matches();
}
public int NoOfUser() {
Cursor c=getReadableDatabase().rawQuery("SELECT count(*) FROM " + TABLE, null);
int count=Integer.parseInt(c.getString(0));
return count;
}
}