在Java类中找到启动菜单的函数,并检查是否有任何关于菜单启动和关闭的代码。修改代码,确保菜单只在需要时才会出现,并且在关闭菜单时应用程序不会崩溃。以下是一个可能的解决方案示例:
DrawerLayout drawerLayout = findViewById(R.id.drawerLayout); ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); drawerLayout.addDrawerListener(toggle); toggle.syncState();
// 添加以下代码以确保菜单只在需要时出现 if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new HomeFragment()).commit(); navigationView.setCheckedItem(R.id.nav_home); }
// 添加以下代码以确保在关闭菜单时应用程序不会崩溃 @Override public void onBackPressed() { DrawerLayout drawer = findViewById(R.id.drawer_layout); if (drawer.isDrawerOpen(GravityCompat.START)) { drawer.closeDrawer(GravityCompat.START); } else { super.onBackPressed(); } }