Java how to find root view group

To find the root view group in an Android app, you can use the getRootView() method from the Activity class.

The getRootView() method returns the top-level view in the view hierarchy of the activity. The top-level view is the root view group for the activity.

Here's an example of how to find the root view group in an Android app:

Activity activity = getActivity();
ViewGroup rootViewGroup = (ViewGroup) activity.getRootView();

In the above example, the getActivity() method is used to get a reference to the activity. The getRootView() method is then called on the activity and the result is cast to a ViewGroup data type and stored in the rootViewGroup variable.

Keep in mind that the getRootView() method returns a View object, not a ViewGroup object. You will need to cast the result to a ViewGroup data type if you want to use it as a view group.

You can then use the rootViewGroup variable to access the views within the root view group or to modify the layout of the root view group.

For example, you can use the addView() method to add a new view to the root view group:

TextView textView = new TextView(activity);
textView.setText("Hello, world!");
rootViewGroup.addView(textView);

In this example, a new TextView is created and added to the root view group using the addView() method. The setText() method is then used to set the text of the TextView.