Unable to populate string with checkbox selection

Question

I have a simple question that I can't seem to figure out. I'm hoping someone can help, but after researching checkboxes, I still cannot solve this.

Here is my code:

CheckBox chkbxUpgrade;
TextView txtViewResult;
Double cost;

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

    txtViewResult = (TextView)findViewById(R.id.textViewResult);
    chkbxUpgrade = (CheckBox)findViewById(R.id.checkBoxUpgrade);

    onCheckboxClicked(cost);
}

public double onCheckboxClicked(Double cost) {
    if (chkbxUpgrade.isChecked()) {
        cost = 6.99;
    }
    else {
        cost = 4.99;
    }
    return cost;
}

public void onClickOrder(View view) {
    Toast.makeText(this, "Order Successful!", Toast.LENGTH_LONG).show();
    txtViewResult.setText("Price: $" + cost);
}

Shouldn't my textview be populated with 4.99 if the checkbox is not checked, or 6.99 if it is checked? I cannot figure out why it is not populating...

Answer 1

xml sould look like :

<CheckBox android:id="@+id/your check box id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="text"
        android:onClick="onCheckboxClicked"/>

Then change your method to be:

public void onCheckboxClicked(View view) {
    // Is the view now checked?
    boolean checked = ((CheckBox) view).isChecked();

   if (checked)
   { 
       cost = 6.99;
   }
   else
   {
      cost =4.99;
   }

}