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btn_view.setVisibility(View.GONE); btn_find.setVisibility(View.GONE); btn_outline.setVisibility(View.GONE); btn_print.setVisibility(View.GONE); btn_annot.setVisibility(View.GONE); btn_select.setVisibility(View.GONE); btn_undo.setVisibility(View.GONE); btn_redo.setVisibility(View.GONE);