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Attempt to invoke virtual method 'android.widget.Filter android.widget.ArrayAdapter.getFilter()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.widget.Filter android.widget.ArrayAdapter.getFilter()' on a null object reference at com.example.trung.flashcardenglish.ielts.Ielts.onQueryTextChange(Ielts.java:244) at android.support.v7.widget.SearchView.onTextChanged(SearchView.java:1150) at android.support.v7.widget.SearchView.access$2000(SearchView.java:103) at android.support.v7.widget.SearchView$12.onTextChanged(SearchView.java:1680) at android.widget.TextView.sendOnTextChanged(TextView.java:7679) at android.widget.TextView.setText(TextView.java:4060)