找不到 ID 的视图

Question

我正在尝试通过 onOptionsItemSelected 实现分片到分片交易，但我一直收到

java.lang.IllegalArgumentException: No view found for id

我也看了这个帖子： Android Fragment no view found for ID? 并对我的代码应用了一些答案，但这并没有解决我的问题

这是我的 HomeFragment.java

    private Toolbar toolbar;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        //Set Toolbar for Fragment
        View v = inflater.inflate(R.layout.fragment_home, container, false);
        toolbar = (Toolbar) v.findViewById(R.id.main_toolbar);
        ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);
        setHasOptionsMenu(true);
        return v;
    }

    @Override
    public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
        inflater.inflate(R.menu.toolbar_menu,menu);
        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        FragmentManager fm = getActivity().getSupportFragmentManager();
        fm.beginTransaction().replace(R.id.cart_fragment_layout,new CartFragment())
                .commitNow();
        return super.onOptionsItemSelected(item);
    }
}

我的fragment_cart.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/cart_fragment_layout"
    tools:context="com.example.fragment.CartFragment"
    android:background="@color/black">

    <!-- TODO: Update blank fragment layout -->
    <LinearLayout
        android:orientation="vertical"
        android:id="@+id/cart_ll"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/cart_rv"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </androidx.recyclerview.widget.RecyclerView>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:textColor="@color/white"
        android:textSize="50dp"
        android:text="Cart Fragment" />
    </LinearLayout>

</FrameLayout>

和我的CartFragment.java

public class CartFragment extends Fragment {


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v = inflater.inflate(R.layout.fragment_cart, container, false);
        return v;
    }
}

我的 MainActivity.java 为了以防万一，我将 HomeFragment 设置为默认值：

public class MainActivity extends AppCompatActivity {
    Toolbar toolbar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        toolbar = findViewById(R.id.main_toolbar);
        setSupportActionBar(toolbar);
        setContentView(R.layout.activity_main);
        BottomNavigationView bottomNav = findViewById(R.id.bottom_navigation);

        bottomNav.setOnNavigationItemSelectedListener(navListener);
        getSupportFragmentManager().beginTransaction().replace(R.id.frament_container,
                new HomeFragment()).commit();
    }

    private BottomNavigationView.OnNavigationItemSelectedListener navListener =
            new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            Fragment selectedFragment = null;

            switch (item.getItemId()){
                case R.id.nav_home:
                    selectedFragment = new HomeFragment();
                    break;
                case R.id.nav_menu:
                    selectedFragment = new MenuFragment();
                    break;
                case R.id.nav_user:
                    selectedFragment = new UserFragment();
                    break;
                case R.id.nav_more:
                    selectedFragment = new MoreFragment();
                    break;
            }
            getSupportFragmentManager().beginTransaction().replace(R.id.frament_container,
                    selectedFragment).commit();
            return true;
        }
    };

}

Answer 1

您在片段事务中使用的 ID 不是片段中视图的视图 ID。它是您要将片段弹出到的布局中片段存根视图的 ID。所以你传入了错误的 id。我不能告诉你什么是正确的，因为你没有给我们你的主要布局 xml。

基本上片段事务会查找您在上下文根布局中传递的 ID，然后弹出已经存在的内容并用您的片段替换它。

找不到 ID 的视图

No view found for ID

java

android

android-fragments