Provide an implementation for View findViewById(ViewGroup root, int id) using ViewGroup and View

Question

Janishar Ali · Accepted Answer

ViewGroup root = (ViewGroup) getWindow().getDecorView().getRootView();
TextView textView = (TextView) findViewById(root, R.id.text);
 textView.setText("Found " + textView.getText());    

  private View findViewById(ViewGroup root, int id) {
        if (root.getId() == id) return root;
        for (int i = 0; i < root.getChildCount(); i++) {
            View child = root.getChildAt(i);
            if (child.getId() == id) return child;
            if (child instanceof ViewGroup) {
                View view = findViewById((ViewGroup) child, id);
                if (view != null) return view;
            }
        }
        return null;
    }

Anonym · Answer

public View findViewById(ViewGroup root, int id) {
        if (root.getId() == id) {
            return root;
        }

        for (int viewIndex = 0; viewIndex < root.getChildCount(); viewIndex++) {
            View childView = root.getChildAt(viewIndex);
            if (childView.getId() == id) {
                return childView;
            }
            if (childView instanceof ViewGroup) {
                View grandChildView = findViewById((ViewGroup) childView, id);
                if (grandChildView != null) {
                    return grandChildView;
                }

            }
        }
        return null;

    }

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