Thread: CheckBox/Spinner error Error

For some reason, when i check for the input of the spinner using an array with a switch statement it does this weird thing. If i use any sort of "if-statement" "for-loop" any thing of that nature, it wont through an error, just when I open the virtual device it will say app has stopped working. When I remove the if-statement or for-loop it will work fine. The reason I need to use an if statement is because i want to check if the checkbox is checked.

Heres my code:

package com.example.gcfcalculator;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
 
public class MainActivity extends Activity implements OnItemSelectedListener {
 
	Spinner spinner;
	String[] paths = {"Rectangle", "Circle", "Triangle"};
	Button equals;
	TextView parm1, parm2;
	EditText value1, value2;
	CheckBox checkArea, checkPerm;
	Boolean checkedArea = false, checkedPerm = false;
 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, paths);
        spinner = (Spinner) findViewById(R.id.spinner);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);
 
    }
 
	@Override
	public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
		int position = spinner.getSelectedItemPosition();
		switch(position){
		case 0:
			//Rectangle
                        //Problem happens here!!!
			if(checkArea.isChecked()){
                           System.out.println("Area is checked");
                        }
			break;
		case 1:
			//Square
			break;
		case 2:
			//Triangle
			break;
		}
 
	}
 
	@Override
	public void onNothingSelected(AdapterView<?> arg0) {
		// TODO Auto-generated method stub
 
	}
 
}

The issue is that checkedArea is never instantiated. You will either need to programatically create it or define is by findByView like you did with the spinner.

checkedArea = (CheckBox)  findViewById(R.id.checkedArea);   //Whatever the id is in the xml layout

Also, I'd advise using an anonymous class for the listener instead of implementing it at the activity level.

spinner.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) 
    {
          switch (position) {
               //etc
          }
    }
 
 
    @Override
    public void onNothingSelected(AdapterView<?> parentView) {  }
});

Also, I'd advise using a string array in the strings.xml instead of defining it in code. IIRC eclipse will complain about defining strings like that.