findViewById NavigationView 后:
// 設(shè)置導(dǎo)航菜單寬度(1 / 2入愧、2 / 3),這里設(shè)置充滿屏幕
ViewGroup.LayoutParams params = navView.getLayoutParams();
params.width = getResources().getDisplayMetrics().widthPixels * 2 / 2;
navView.setLayoutParams(params);