Is it possible to cast View to ViewGroup?

Question

  private void scaleAllViews(ViewGroup parentLayout) {

        int count = parentLayout.getChildCount();
        Log.d(TAG, "scaleAllViews: "+count);
        View v = null;
        for (int i = 0; i < count; i++) {
            try {
                v = parentLayout.getChildAt(i);

                if(((ViewGroup)v).getChildCount()>0){
                   scaleAllViews((ViewGroup)v);
                }else{
                    if (v != null) {
                        v.setScaleY(0.9f);
                    }
                }

            } catch (NullPointerException e) {
            }
        }
    }

I created a recursive function to access child items of view group, but the parentLayout.getChildAt(i); returns a View, which contains children too, so I need to access that, but after casting I get the error java.lang.ClassCastException: android.support.v7.widget.AppCompatImageView cannot be cast to android.view.ViewGroup

Answer 1

You need to check if it is a ViewGroup before casting to ViewGroup.

if(v instanceof ViewGroup) {
    // now this is a safe cast
    ViewGroup vg = (ViewGroup) vg;
    // ... use this ViewGroup
} else {
    // It's some other type of View
}