Resource ID through getIdentifier returns 0

Question

private String isChecked(String id) {
    id = "R.id." + id;
    int ID = getResources().getIdentifier(id, "id", "com.example.android.justjava");
    CheckBox checkBox = (CheckBox) findViewById(ID);
    return String.valueOf(checkBox.isChecked());
}

I pass in a value of check_whipped_cream(A check box's id in a xml document) into the function above, but when I debug the app, the variable ID always becomes equal to 0. What is wrong with it?

NOTE: The isChecked() called in the last line method is from the CheckBox class.

Answer 1

the big issue is

 id = "R.id." + id;

you are asking android to look for R.id.id into id since you are providing already "id" as second argument. It should be just id. To avoid issues with misspelled words you should rely on the return value of .getPackageName() instead of hard coding it on your own.

Use

get rid of id = "R.id." + id;

getResources().getIdentifier(id, "id", getPackageName());