Android Studio 导航抽屉片段重叠答案

【问题标题】：Android Studio Navigation Drawer fragments overlappingAndroid Studio 导航抽屉片段重叠
【发布时间】：2020-09-10 11:37:57
【问题描述】：

我已在我的项目中添加了一个导航抽屉活动，并且我正在尝试将项目添加为片段。这是我在主要活动中所做的。

fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.add(R.id.nav_host_fragment, new HomeFragment());
        fragmentTransaction.commit();

        navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
           public boolean onNavigationItemSelected(@NonNull MenuItem item)
            {
                DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
                drawer.closeDrawer(GravityCompat.START);
                int id = item.getItemId();
                if (id == R.id.nav_home)
                {
                    fragmentManager = getSupportFragmentManager();
                    fragmentTransaction = fragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.nav_host_fragment, new HomeFragment());
                    fragmentTransaction.commit();

                }
                else if(id == R.id.Shopping_list)
                {
                    fragmentManager = getSupportFragmentManager();
                    fragmentTransaction = fragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.nav_host_fragment, new ShoppingListFragment());
                    fragmentTransaction.commit();
                }
                else if(id == R.id.nav_Language)
                {
                    fragmentManager = getSupportFragmentManager();
                    fragmentTransaction = fragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.nav_host_fragment, new FragmentLang());
                    fragmentTransaction.commit();
                }

默认片段是 Home，它工作正常，如预期的那样，但其他片段与 Home Fragment 重叠。（HomeFragment 是唯一可以正常工作的）。我在每个 Fragment 类中都做了类似的事情：

public class ShoppingListFragment extends Fragment{
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
   View view = inflater.inflate(R.layout.fragment_shopping_list, container,false);
   return view;
    }

}

我看不出错误在哪里。一切看起来都不错，但所有其他片段都显示在 HomeFragment 上。

【问题讨论】：

标签： android android-fragments

【解决方案1】：

片段管理器维护所有之前被替换的片段的堆栈，有时后面的堆栈片段与我们替换的片段重叠，添加这一行

fragmentManager.popBackStack();

像这样，

fragmentManager = getSupportFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.nav_host_fragment, new HomeFragment());
fragmentManager.popBackStack();
fragmentTransaction.commit();

希望会有所帮助。快乐编码:)

【讨论】：