获取焦点

new Thread(new Runnable() {
        @Override
        public void run() {
            while (true) {
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                View rootview = DetailActivity.this.getWindow().getDecorView();
                View aaa = rootview.findFocus();
                Log.i("tag", aaa.toString());
            }
 
        }
    }).start();