Java 在片段中实现RecyclerView

我试图在AppActivity中的ViewPager内的片段中创建ListView。在AppCompatitorActivity中，所有视图元素都以协调布局方式展开。因为我用了坐标仪。我必须使用RecylerView，我正试图从中了解培训内容 ，但我的应用程序在登录后停止。这是我在myFragment中的代码，应用程序在其中停止

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

//...

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_city_list, container, false)

    mRecyclerView = (RecyclerView) view.findViewById(android.R.id.list);
    mLayoutManager = new LinearLayoutManager(this.getActivity());
    Log.d("debugMode", "The application stopped after this");
    mRecyclerView.setLayoutManager(mLayoutManager);

    mAdapter = new RecyclerAdapter(getNames());
    mRecyclerView.setAdapter(mAdapter);
    return view;
}

//...

用这个

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_city_list, container, false)

    // Replace 'android.R.id.list' with the 'id' of your RecyclerView
    mRecyclerView = (RecyclerView) view.findViewById(android.R.id.list);
    mLayoutManager = new LinearLayoutManager(this.getActivity());
    Log.d("debugMode", "The application stopped after this");
    mRecyclerView.setLayoutManager(mLayoutManager);

    mAdapter = new RecyclerAdapter(getNames());
    mRecyclerView.setAdapter(mAdapter);
    return view;
}

您应该在

Recyclerview

上调用

setLayoutManager

和

setAdapter

方法（）

加上

mRecyclerView=（RecyclerView）view.findviewbyd（android.R.id.list）

您不应该使用
android.R.id.list
，因为您没有使用
ListFragment
。将其替换为您的
id
Recyclerview
（如在XML布局中）。
您是否将android.R.id.list设置为Recyclerview id？否则，应在xml文件中为recyclerview设置一个id，如下所示：

android:id="@+id/recyclerview"

换一条线

mRecyclerView = (RecyclerView) view.findViewById(android.R.id.list);

到

公共类HomeFragment扩展了片段{
私有HomeViewModel HomeViewModel；
公共视图onCreateView（@NonNull layoutiner充气机，
视图组容器，捆绑包savedInstanceState）{
homeViewModel=
ViewModelProviders.of（this.get）（HomeViewModel.class）；
视图根=充气机。充气（R.layout.fragment\u home，container，false）；
final TextView TextView=root.findviewbyd（R.id.text\u home）；
homeViewModel.getText（）.observe（这是新的观察者（）{
@凌驾
公共void onChanged（@Nullable String s）{
textView.setText；
}
});
FragmentActivity c=getActivity（）；
RecyclerView RecyclerView=root.findViewById（R.id.my\u recycler\u视图）；
setLayoutManager（新的GridLayoutManager（c，2））；
List villageModels=new ArrayList（）；
VillageModel VillageModel=新的VillageModel（“，0,0,0,0,0）；
添加（villageModel）；
VillageModel villageModel1=新的VillageModel（“，0,0,0,0,0）；
VillageModel villageModel2=新的VillageModel（“，0,0,0,0,0）；
添加（villageModel1）；
添加（villageModel2）；
VillageAdapter=新VillageAdapter（c，villageModels）；
recyclerView.setAdapter（适配器）；
返回根；
}
}

将回收适配器添加到oncreateView
片段主xml结构

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/my_recycler_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:scrollbars="vertical"
    />
</RelativeLayout>


你能发布坠机报告吗？谢谢！已经很晚了，我没有看到R.id.list没有引用我的列表！我被困了好几个小时！我有一个问题，getNames从哪里来？
getNames（）
是一个返回数据列表以填充
RecyclerView
public class HomeFragment extends Fragment {

private HomeViewModel homeViewModel;

public View onCreateView(@NonNull LayoutInflater inflater,
                         ViewGroup container, Bundle savedInstanceState) {
    homeViewModel =
            ViewModelProviders.of(this).get(HomeViewModel.class);
    View root = inflater.inflate(R.layout.fragment_home, container, false);
    final TextView textView = root.findViewById(R.id.text_home);
    homeViewModel.getText().observe(this, new Observer<String>() {
        @Override
        public void onChanged(@Nullable String s) {
            textView.setText(s);
        }
    });
     FragmentActivity c = getActivity();
     RecyclerView recyclerView = root.findViewById(R.id.my_recycler_view);
    recyclerView.setLayoutManager(new GridLayoutManager(c, 2));

    List<VillageModel> villageModels=new ArrayList<>();
    VillageModel villageModel =new VillageModel("",0,0,0,0,0,0);
    villageModels.add(villageModel);
    VillageModel villageModel1 =new VillageModel("",0,0,0,0,0,0);
    VillageModel villageModel2 =new VillageModel("",0,0,0,0,0,0);
    villageModels.add(villageModel1);
    villageModels.add(villageModel2);
    VillageAdapter adapter = new VillageAdapter(c,villageModels);
    recyclerView.setAdapter(adapter);
    return root;
 }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/my_recycler_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:scrollbars="vertical"
    />
</RelativeLayout>