Question

I am trying to make adapters for spinners, however I get an NullPointerException on answertime.setAdapter(adapter); Why is this? My arrays are in the strings.xml where they should be?
Here is the full code.

package lijap.app.starcraft2counters;

import java.io.File;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

public class Settings extends Activity implements OnItemSelectedListener {
Spinner answertime;
Spinner gametime;
Spinner missesallowed;

String[] answerseconds = { "Unlimited", "1 second", "2 seconds",
        "3 seconds", "4 seconds", "5 seconds" };

String[] gameminutes = { "Unlimited", "1 minute", "2 minutes", "3 minutes",
        "4 minutes", "5 minutes" };

String[] numberofmisses = { "Unlimited", "5", "10", "15", "20", "25" };

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.settings);

    ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.AnswerSeconds, R.layout.custom_spinner_list);
    adapter.setDropDownViewResource(R.layout.custom_spinner);
    answertime.setAdapter(adapter);

    ArrayAdapter adapter2 = ArrayAdapter.createFromResource(this, R.array.GameMinutes, R.layout.custom_spinner_list);
    adapter.setDropDownViewResource(R.layout.custom_spinner);
    gametime.setAdapter(adapter);

    ArrayAdapter adapter3 = ArrayAdapter.createFromResource(this, R.array.NumberOfMisses, R.layout.custom_spinner_list);
    adapter.setDropDownViewResource(R.layout.custom_spinner);
    missesallowed.setAdapter(adapter);


    answertime = (Spinner) findViewById(R.id.s_answertime);
    answertime.setAdapter(adapter);
    answertime.setOnItemSelectedListener(this);


    missesallowed = (Spinner) findViewById(R.id.s_mistakenumber);
    missesallowed.setAdapter(adapter2);
    missesallowed.setOnItemSelectedListener(this);

    gametime = (Spinner) findViewById(R.id.s_gametime);
    gametime.setAdapter(adapter3);
    gametime.setOnItemSelectedListener(this);
}

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
        long arg3) {
    // TODO Auto-generated method stub

}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
    // TODO Auto-generated method stub

}

}

Any help is appreciated- Lijap

Answer 1

you never initialize answertime, gametime, or missesallowed. you need to do something like this,

answertime = findViewById(R.id.<the id for this spinner>);
gametime = findViewById(R.id.<the id for this spinner>);
missesallowed = findViewById(R.id.<the id for this spinner>);

before you call setAdapter() on them.

also, here’s another problem,

ArrayAdapter adapter2 = ArrayAdapter.createFromResource(this, R.array.GameMinutes, R.layout.custom_spinner_list);
adapter.setDropDownViewResource(R.layout.custom_spinner);
gametime.setAdapter(adapter);

notice that you construct something into the reference adapter2, then you modify adapter, and set adapter as the adapter for the spinner. is that what you want?