Completed Login

app/src/main/java/com/example/bookingapp_austinblanke/CreateAccountActivity.java

@@ -2,6 +2,8 @@ package com.example.bookingapp_austinblanke;
 
 import androidx.appcompat.app.AppCompatActivity;
 import android.content.Intent;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.EditText;
@@ -24,10 +26,21 @@ public class CreateAccountActivity extends AppCompatActivity {
         EditText username = findViewById(R.id.Username);
         EditText password = findViewById(R.id.Password);
 
-        connector.addNewUser(username.getText().toString(), password.getText().toString());
-
-        Intent intent = new Intent(this, LoginActivity.class);
-        startActivity(intent);
+        if (username.length() == 0 || password.length() == 0){
+            Toast.makeText(this, "username or password not provided", Toast.LENGTH_SHORT).show();
+        }
+        else{
+
+            if (connector.usernameRepeat(username.getText().toString())){
+                Toast.makeText(this, "username already taken", Toast.LENGTH_SHORT).show();
+            }
+            else{
+                connector.addNewUser(username.getText().toString(), password.getText().toString());
+
+                Intent intent = new Intent(this, LoginActivity.class);
+                startActivity(intent);
+            }
+        }
     }
 
 }

app/src/main/java/com/example/bookingapp_austinblanke/DatabaseConnector.java

@@ -54,6 +54,24 @@ public class DatabaseConnector extends SQLiteOpenHelper {
 
     }
 
+    public boolean usernameRepeat(String username){
+        boolean result = false;
+        String query = "SELECT * FROM " + TABLE_USERS + " WHERE " + COLUMN_USERNAME + " = \"" + username +"\"";
+        SQLiteDatabase db = this.getWritableDatabase();
+        Cursor cursor = db.rawQuery(query, null);
+
+        if(cursor.getCount() == 0){
+            result = false;
+        }
+        else result = true;
+
+
+        cursor.close();
+        db.close();
+
+        return result;
+    }
+
     public boolean login(String username, String password) {
         String query = "SELECT * FROM " + TABLE_USERS + " WHERE " + COLUMN_USERNAME + " = \"" + username +"\"";
         SQLiteDatabase db = this.getWritableDatabase();