String[] strings=new String[]{"1","2","3","4","5","6","7"};
listView.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_expandable_list_item_1,strings));
String[] strings=new String[]{"1","2","3","4","5","6","7"};
listView.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_expandable_list_item_1,strings));
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