Hide an option in a spinner


Hide an option in a spinner



So I'm creating currency converting app on android I have two spinners and I'm trying to hide option from the second spinner when that option is already selected by the first spinner, like if i choose to convert from USD the second spinner USD option should disappear but I just don't have any idea how to hide an option I searched on google most question asks about hiding the whole spinner not option


package com.currencyconverter;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;

import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

import static com.currencyconverter.globalData.amountToBeConvert;
import static com.currencyconverter.globalData.currencies;
import static com.currencyconverter.globalData.currencyFrom;
import static com.currencyconverter.globalData.currencyTo;

public class MainActivity extends AppCompatActivity {
public Button btn;
public EditText et_AmountToBeConverted;
public Spinner sp_CurrencyFrom;
public Spinner sp_CurrencyTo;
public TextView tv_ConvertedAmount;
public TextView tv_ConvertedCurrency;

DatabaseReference databaseReference;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

//Declaring XML
btn = findViewById(R.id.button);
et_AmountToBeConverted = findViewById(R.id.et_AmountToBeConverted);
sp_CurrencyFrom = findViewById(R.id.sp_CurrencyFrom);
sp_CurrencyTo = findViewById(R.id.sp_CurrencyTo);
tv_ConvertedAmount = findViewById(R.id.tv_ConvertedAmount);
tv_ConvertedCurrency = findViewById(R.id.tv_ConvertedCurrency);


// Database work
databaseReference = FirebaseDatabase.getInstance().getReference("Rates");
databaseReference.keepSynced(true);



//Inserting string to spinners
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, currencies);
sp_CurrencyTo.setAdapter(adapter);
sp_CurrencyFrom.setAdapter(adapter);




//Spinner onseclectlistener
sp_CurrencyFrom.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
currencyFrom = i;
}

@Override
public void onNothingSelected(AdapterView<?> adapterView) {

}
});

sp_CurrencyTo.getItemAtPosition((int) sp_CurrencyFrom.getSelectedItemId()).setEnabled(false);

sp_CurrencyTo.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
currencyTo = i;



}

@Override
public void onNothingSelected(AdapterView<?> adapterView) {

}
});









//Convert!!
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

//Convert XML to data
amountToBeConvert = Double.parseDouble(et_AmountToBeConverted.getText().toString());

}
});
}
}



globalData


package com.currencyconverter;

public class globalData {
public static String currencies = {"AED", "AFN", "ALL", "AMD", "ANG", "AOA", "ARS", "AUD", "AWG", "AZN", "BAM", "BBD", "BDT", "BGN", "BHD", "BIF", "BMD", "BND", "BOB", "BRL", "BSD", "BTC", "BTN", "BWP", "BYN", "BYR", "BZD", "CAD", "CDF", "CHF", "CLF", "CLP", "CNY", "COP", "CRC", "CUC", "CUP", "CVE", "CZK", "DJF", "DKK", "DOP", "DZD", "EGP", "ERN", "ETB", "EUR", "FJD", "FKP", "GBP", "GEL", "GGP", "GHS", "GIP", "GMD", "GNF", "GTQ", "GYD", "HKD", "HNL", "HRK", "HTG", "HUF", "IDR", "ILS", "IMP", "INR", "IQD", "IRR", "ISK", "JEP", "JMD", "JOD", "JPY", "KES", "KGS", "KHR", "KMF", "KPW", "KRW", "KWD", "KYD", "KZT", "LAK", "LBP", "LKR", "LRD", "LSL", "LTL", "LVL", "LYD", "MAD", "MDL", "MGA", "MKD", "MMK", "MNT", "MOP", "MRO", "MUR", "MVR", "MWK", "MXN", "MYR", "MZN", "NAD", "NGN", "NIO", "NOK", "NPR", "NZD", "OMR", "PAB", "PEN", "PGK", "PHP", "PKR", "PLN", "PYG", "QAR", "RON", "RSD", "RUB", "RWF", "SAR", "SBD", "SCR", "SDG", "SEK", "SGD", "SHP", "SLL", "SOS", "SRD", "STD", "SVC", "SYP", "SZL", "THB", "TJS", "TMT", "TND", "TOP", "TRY", "TTD", "TWD", "TZS", "UAH", "UGX", "UYU", "UZS", "VEF", "VND", "VUV", "WST", "XAF", "XAG", "XAU", "XCD", "XDR", "XOF", "XPF", "YER", "ZAR", "ZMK", "ZMW", "ZWL" };
public static double rate;
public static double amountToBeConvert;
public static int currencyFrom;
public static int currencyTo;
public static String currencies2 = {"AED", "AFN", "ALL", "AMD", "ANG", "AOA", "ARS", "AUD", "AWG", "AZN", "BAM", "BBD", "BDT", "BGN", "BHD", "BIF", "BMD", "BND", "BOB", "BRL", "BSD", "BTC", "BTN", "BWP", "BYN", "BYR", "BZD", "CAD", "CDF", "CHF", "CLF", "CLP", "CNY", "COP", "CRC", "CUC", "CUP", "CVE", "CZK", "DJF", "DKK", "DOP", "DZD", "EGP", "ERN", "ETB", "EUR", "FJD", "FKP", "GBP", "GEL", "GGP", "GHS", "GIP", "GMD", "GNF", "GTQ", "GYD", "HKD", "HNL", "HRK", "HTG", "HUF", "IDR", "ILS", "IMP", "INR", "IQD", "IRR", "ISK", "JEP", "JMD", "JOD", "JPY", "KES", "KGS", "KHR", "KMF", "KPW", "KRW", "KWD", "KYD", "KZT", "LAK", "LBP", "LKR", "LRD", "LSL", "LTL", "LVL", "LYD", "MAD", "MDL", "MGA", "MKD", "MMK", "MNT", "MOP", "MRO", "MUR", "MVR", "MWK", "MXN", "MYR", "MZN", "NAD", "NGN", "NIO", "NOK", "NPR", "NZD", "OMR", "PAB", "PEN", "PGK", "PHP", "PKR", "PLN", "PYG", "QAR", "RON", "RSD", "RUB", "RWF", "SAR", "SBD", "SCR", "SDG", "SEK", "SGD", "SHP", "SLL", "SOS", "SRD", "STD", "SVC", "SYP", "SZL", "THB", "TJS", "TMT", "TND", "TOP", "TRY", "TTD", "TWD", "TZS", "UAH", "UGX", "UYU", "UZS", "VEF", "VND", "VUV", "WST", "XAF", "XAG", "XAU", "XCD", "XDR", "XOF", "XPF", "YER", "ZAR", "ZMK", "ZMW", "ZWL" };
}



EDIT:


package com.currencyconverter;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;

import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

import static com.currencyconverter.globalData.amountToBeConvert;
import static com.currencyconverter.globalData.currencies;
import static com.currencyconverter.globalData.currencies2;
import static com.currencyconverter.globalData.currencyFrom;
import static com.currencyconverter.globalData.currencyTo;

public class MainActivity extends AppCompatActivity {
public Button btn;
public EditText et_AmountToBeConverted;
public Spinner sp_CurrencyFrom;
public Spinner sp_CurrencyTo;
public TextView tv_ConvertedAmount;
public TextView tv_ConvertedCurrency;

DatabaseReference databaseReference;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

//Declaring XML
btn = findViewById(R.id.button);
et_AmountToBeConverted = findViewById(R.id.et_AmountToBeConverted);
sp_CurrencyFrom = findViewById(R.id.sp_CurrencyFrom);
sp_CurrencyTo = findViewById(R.id.sp_CurrencyTo);
tv_ConvertedAmount = findViewById(R.id.tv_ConvertedAmount);
tv_ConvertedCurrency = findViewById(R.id.tv_ConvertedCurrency);


// Database work
databaseReference = FirebaseDatabase.getInstance().getReference("quotes");
databaseReference.keepSynced(true);



//Inserting string to spinners
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, currencies);
final ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, currencies2);
sp_CurrencyTo.setAdapter(adapter);
sp_CurrencyFrom.setAdapter(adapter2);




//Spinner onseclectlistener
sp_CurrencyFrom.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
currencyFrom = i;
}

@Override
public void onNothingSelected(AdapterView<?> adapterView) {

}
});

adapter2.remove(currencies2[sp_CurrencyFrom.getSelectedItemPosition()]);
adapter2.notifyDataSetChanged();

sp_CurrencyTo.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
currencyTo = i;

}

@Override
public void onNothingSelected(AdapterView<?> adapterView) {

}
});









//Convert!!
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

//Convert XML to data
amountToBeConvert = Double.parseDouble(et_AmountToBeConverted.getText().toString());

}
});
}
}





When first spinner gets selected, remove that string from second array adapter.
– Abhinav Pawar
Jul 2 at 9:51





i.e in OnItemSelected listner of first spinner. Remove that entry from second adapter (make it member variable of class) by calling adapter.remove(String)
– Abhinav Pawar
Jul 2 at 9:54





Just use different adapters for the 2 spinners (although they're populated with the same items) and remove the item you want from the 2nd
– mTak
Jul 2 at 9:56




1 Answer
1



You can't remove items from the arrays you use for your adapters.
Declare them like this:


ArrayList<String> currencies = new ArrayList<String>(Arrays.asList("AED", "AFN", "ALL", .......));



Now you use ArrayList and you can remove items.





I edited the class, now its two adapters but remove function is crashing the app
– Kadiem Haider
Jul 2 at 10:23





Read my answer, the solution with 2 adapters is very complicated
– mTak
Jul 2 at 10:24






Sorry but I just started learning java my main question was how do I remove an option on (repopulate) currencies array.
– Kadiem Haider
Jul 2 at 10:29



currencies





Do currencies.remove(index); where index is the position of the item to be removed and then call adapter.notifyDataSetChanged(); to refresh the data in your spinner.
– mTak
Jul 2 at 10:38


currencies.remove(index);


index


adapter.notifyDataSetChanged();





Can't use currencies.remove(index); its writing me error I should use adapter.remove(index); and that line crashes the app.
– Kadiem Haider
Jul 2 at 10:42



currencies.remove(index);


adapter.remove(index);






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