How to find out which view is focused?

How to find out which view is focused?

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I need to find out if any view is focused inside an Activity and what view it is. How to do this?

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Call getCurrentFocus() on the Activity.

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From the source of Activity:

   /**
     * Calls {@link android.view.Window#getCurrentFocus} on the
     * Window of this Activity to return the currently focused view.
     * 
     * @return View The current View with focus or null.
     * 
     * @see #getWindow
     * @see android.view.Window#getCurrentFocus
     */
    public View getCurrentFocus() {
        return mWindow != null ? mWindow.getCurrentFocus() : null;
    }

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for some reason getCurrentFocus() method isn't available anymore; probably it's deprecated already, here the working alternative:

View focusedView = (View) yourParentView.getFocusedChild();

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Just put this inside your Activity inside the onCreate method then look into your logcat to see what is currently focused.

  new Thread(() -> {
        int oldId = -1;
        while (true) {
            View view = this.getCurrentFocus();
            if (view != null && view.getId() != oldId) {
                oldId = view.getId();
                String idName = "";
                try {
                   idName = getResources().getResourceEntryName(newView.getId());
                 } catch (Resources.NotFoundException e) {
                   idName = String.valueOf(newView.getId());
                 }
                Log.i(TAG, "Focused Id: " + idName + " Class: " + view.getClass());
            }
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }).start();

Be aware this thread runs in a 100ms cycle so it doesn't overflow the CPU with unnecessary work.

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if you are in a fragment you can use

getView().findFocus()

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ViewGroup has quite convenient method for retrieving focused child:

ViewGroup.getFocusedChild()

참고URL : https://stackoverflow.com/questions/5352209/how-to-find-out-which-view-is-focused