[英]How to check when the user logins for the first time Android Studio SQLite
我有一個注冊 Activirty，我可以在其中創建各種用戶，並且用戶名和密碼保存在數據庫中。 當我登錄時，它會將我重定向到一個活動。 我的需要是，如果這是我第一次登錄，它應該加載 CreateProfile Activity，如果不是，它應該加載 Profile Activity。 現在我用 Toast 消息制作它，但它總是加載 toast 消息“正常登錄”。
這是 DBHelper：
package com.example.sqlite;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.Toast;
import androidx.annotation.Nullable;
public class DBHelper extends SQLiteOpenHelper {
private Context context;
private static final String DATABASE_NAME = "Database.db";
private static final int DATABASE_VERSION = 1;
// USERS TABLE
private static final String TABLE_USERS = "USERS";
private static final String COLUMN_ID = "user_id";
private static final String COLUMN_USERNAME = "username";
private static final String COLUMN_PASSWORD = "password";
private static final String COLUMN_FIRST_TIME = "first_time";
// PROFILE TABLE
private static final String TABLE_PROFILE = "PROFILE";
//private static final String COLUMN_PROF_ID = "profile_id";
private static final String COLUMN_FIRSTNAME = "firstname";
private static final String COLUMN_LASTNAME = "lastname";
private static final String COLUMN_AGE = "age";
private static final String COLUMN_WEIGHT = "weight";
private static final String COLUMN_HEIGHT = "height";
// private static final String COLUMN_GENDER = "gender";
public DBHelper(@Nullable Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
//String usersQuery = "CREATE TABLE " + TABLE_USERS + " (" + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COLUMN_USERNAME + " TEXT, " + COLUMN_PASSWORD + " INTEGER " + ")";
//String profileQuery = "CREATE TABLE " + TABLE_PROFILE + " (" + COLUMN_ID + " INTEGER , " + COLUMN_FIRST_NAME + " TEXT, " + COLUMN_LAST_NAME + " TEXT, " + COLUMN_AGE + " INTEGER, " + COLUMN_WEIGHT + " INTEGER, " + COLUMN_HEIGHT + " INTEGER " + ")";
String usersQuery = String.format("CREATE TABLE IF NOT EXISTS %s ( %s INTEGER PRIMARY KEY AUTOINCREMENT, %s TEXT, %s INTEGER, %s INTEGER DEFAULT 1 )",TABLE_USERS,COLUMN_ID,COLUMN_USERNAME,COLUMN_PASSWORD,COLUMN_FIRST_TIME);
String profileQuery = String.format("CREATE TABLE IF NOT EXISTS %s ( %s TEXT, %s TEXT, %s INTEGER, %s INTEGER, %s INTEGER)",TABLE_PROFILE,COLUMN_FIRSTNAME,COLUMN_LASTNAME, COLUMN_AGE, COLUMN_WEIGHT, COLUMN_HEIGHT);
db.execSQL(usersQuery);
db.execSQL(profileQuery);
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_USERS);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_PROFILE);
onCreate(db);
}
public Boolean registerUser(String username, String password){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(COLUMN_USERNAME, username);
cv.put(COLUMN_PASSWORD, password);
long result = db.insert(TABLE_USERS, null, cv);
db.close();
if (result != -1)
{
Toast.makeText(context, "Registration Successful", Toast.LENGTH_SHORT).show();
return true;
}
else
return false;
}
Cursor readAllData() {
String query = "SELECT * FROM " + TABLE_USERS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = null;
if (db != null) {
cursor = db.rawQuery(query, null);
}
return cursor;
}
// function that checks if user exists in the database
public Boolean checkUsername(String username)
{
SQLiteDatabase myDB = this.getWritableDatabase();
Cursor cursor = myDB.rawQuery("select * from users where username = ?", new String[] {username}); // if the data exists the cursor will have some data
// check if cursor has any data or not
if (cursor.getCount() > 0)
{
return true; // cursor has some data (user exists)
}
else
{
return false;
}
}
public Boolean checkUsernamePassword (String username, String password) // check the username and password
{
SQLiteDatabase myDB = this.getWritableDatabase();
Cursor cursor = myDB.rawQuery("select * from users where username = ? and password = ?", new String[] {username, password});
if (cursor.getCount() > 0) // if the data exists then return true
{
return true;
}
else
{
return false;
}
}
public Boolean insertProfileData(String user_id, String firstname, String lastname, String age, String weight, String height) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(COLUMN_ID, user_id);
cv.put(COLUMN_FIRSTNAME, firstname);
cv.put(COLUMN_LASTNAME, lastname);
cv.put(COLUMN_AGE, age);
cv.put(COLUMN_WEIGHT, weight);
cv.put(COLUMN_HEIGHT, height);
int cursor= (int) db.insert(TABLE_PROFILE, null, cv);
db.close();
if (cursor > 0)
return true;
else
return false;
}
Cursor readProfileInfo() {
String query = "SELECT * FROM " + TABLE_PROFILE;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = null;
if (db != null) {
cursor = db.rawQuery(query, null);
}
return cursor;
}
public int fetch_username(String username) {
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery("select * from users where username = '"+username +"'" , null);
if(cursor.moveToFirst()){
do{
return cursor.getInt(0);
}while (cursor.moveToNext());
}
else
return -1;
}
public String fetch_profileData(String id) {
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery("select * from PROFILE where user_id = '"+id +"'" , null);
if(cursor.moveToFirst()){
do{
return cursor.getString(1);
}while (cursor.moveToNext());
}
else
return null;
}
public boolean check_first_time(String user_id) {
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery("select * from users where user_id = '"+user_id +"'" , null);
if(cursor.moveToFirst()){
do{
int value = cursor.getInt(2);
if(value == 1){
return true;
}
else{
return false;
}
}while (cursor.moveToNext());
}
else
return false;
}
public boolean update_first_time_status(String user_id) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_FIRST_TIME,0);
int cursor= db.update(TABLE_USERS, values, "user_id=?", new String[] {String.valueOf(user_id)});
db.close();
if (cursor > 0)
return true;
else
return false;
}
}
登錄活動：
package com.example.sqlite;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class LoginActivity extends AppCompatActivity {
TextView signUp;
EditText username, password;
Button loginBtn;
DBHelper myDB;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
myDB = new DBHelper(LoginActivity.this);
signUp = (TextView) findViewById(R.id.tv_signUp);
username = (EditText) findViewById(R.id.tv_fullname);
password = (EditText) findViewById(R.id.tv_age);
loginBtn = (Button) findViewById(R.id.loginBtn);
signUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(LoginActivity.this, RegisterActivity.class));
}
});
loginBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String user = username.getText().toString().trim();
String pass = password.getText().toString().trim();
if (user.equals("") || pass.equals(""))
{
Toast.makeText(LoginActivity.this, "Fill all the fields", Toast.LENGTH_SHORT).show();
}
else
{
// check username and password if they exist/equal in the database - if yes login to the app
Boolean userPassCheckResult = myDB.checkUsernamePassword(user, pass);
if (userPassCheckResult)
{
int user_id = myDB.fetch_username(user);
if(myDB.check_first_time(String.valueOf(user_id)))
{
Toast.makeText(LoginActivity.this, "! FIRST LOGIN !", Toast.LENGTH_LONG).show();
//Intent intent = new Intent(LoginActivity.this, CreateProfileActivity.class);
//startActivity(intent);
myDB.update_first_time_status(String.valueOf(user_id));
}
else
{
Toast.makeText(LoginActivity.this, "normal login..", Toast.LENGTH_LONG).show();
//Intent intent = new Intent(LoginActivity.this, ProfileActivity.class);
//startActivity(intent);
}
}
else
{
Toast.makeText(LoginActivity.this, "Invalid Credentials", Toast.LENGTH_SHORT).show();
}
}
}
});
}
}
如果您需要 RegisterActivity：
package com.example.sqlite;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
public class RegisterActivity extends AppCompatActivity {
TextView tv_signIn;
EditText username, password, repeatPass;
Button registerBtn;
DBHelper db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
username = findViewById(R.id.username_input);
password = findViewById(R.id.password_input);
repeatPass = findViewById(R.id.repeatPass);
registerBtn = findViewById(R.id.signUpBtn);
tv_signIn = findViewById(R.id.tv_signIn);
//DBHelper myDB = new DBHelper(this);
tv_signIn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(RegisterActivity.this, LoginActivity.class);
startActivity(intent);
}
});
registerBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
DBHelper myDB = new DBHelper(RegisterActivity.this);
String user = username.getText().toString().trim();
String pass = password.getText().toString().trim();
String repass = repeatPass.getText().toString().trim();
if (user.isEmpty())
{
username.setError("Username is required!");
username.requestFocus();
return;
}
if (pass.isEmpty())
{
password.setError("Password is required!");
password.requestFocus();
return;
}
if (pass.length() < 6)
{
password.setError("Min password length should be 6 characters!");
password.requestFocus();
return;
}
else if (pass.equals(repass))
{
Boolean usercheckResult = myDB.checkUsername(user);
if (!usercheckResult) {
Boolean checkInsertData = myDB.registerUser(user, pass); // add user - Register
if (checkInsertData) {
Toast.makeText(RegisterActivity.this, "Registration Successful", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(RegisterActivity.this, com.example.sqlite.LoginActivity.class);
startActivity(intent);
} else {
Toast.makeText(RegisterActivity.this, "Failed", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(RegisterActivity.this, "User already exists. \n Please Sign In", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(RegisterActivity.this, "Passwords do not Match!", Toast.LENGTH_SHORT).show();
repeatPass.requestFocus();
return;
}
}
});
}
}
你有：-
Cursor cursor = db.rawQuery("select * from users where user_id = '"+user_id +"'" , null);
if(cursor.moveToFirst()){
do{
int value = cursor.getInt(2);
if(value == 1){
return true;
}
else{
return false;
}
}while (cursor.moveToNext());
}
SQL SELECT * FROM users....將返回與 users 表 (4) 中的列一樣多的列，其中getInt(2)將檢索第三列（密碼）是每一個可能是 1嗎？ （修辭）
我相信你想要getInt(3) 。 但是，最好不要硬編碼偏移量並使用getColumnIndex()方法通過其名稱獲取列的索引。
如果通過user_id搜索，因為它是一個主鍵，那么它只能返回一個1。所以你不需要循環通過cursor。
所以你可以： -
public boolean check_first_time(String user_id) {
SQLiteDatabase db = this.getWritableDatabase();
boolean rv = false;
Cursor cursor = db.rawQuery("SELECT * from users where user_id=?" ,new String[]{user_id});
if(cursor.moveToFirst()){
rv = cursor.getInt(cursor.getColumnIndex("first_time")) != 1
}
cursor.close();
return rv;
}
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