Android Studio : View iteration returning null

Question

I am facing a problem trying to put views into an arrayList with a loop.

This works:

String textV = "chkBox1Text";
int textI = getResources().getIdentifier(textV, "id", getPackageName());
TextView test = (TextView)findViewById(textI);
test.setText("Test 01");

However this

ArrayList<TextView> friendNames = new ArrayList<TextView>();
for(int i = 0; i < 10; i++){
        String textViewID = "chkBox" + i+1 + "Text";
        int current = getResources().getIdentifier(textViewID, "id", getPackageName());
        TextView currentTV = (TextView)findViewById(current);
        friendNames.add(currentTV);
    }
friendNames.get(0).setText("Test 01");  // 0 or 1 

Returns a null pointer exception:

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference at ******.FriendActivity.onCreate(FriendActivity.java:56)

Am I doing something incorrectly?

Answer 1

It's hard to confirm, but I think your problem is that perhaps:

friendNames.add((TextView)findViewById(currentTV));

should just be:

friendNames.add(currentTV);

since currentTV is already a TextView, which you found in the previous line.

Answer 2

Rookie Mistake,

 String textViewID = "chkBox" + i+1 + "Text";

Should really be

 String textViewID = "chkBox" + (i+1) + "Text";

Thanks to Mike M