DialogFragment 调用失败
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【中文标题】DialogFragment 调用失败【英文标题】：DialogFragment call failed 【发布时间】：2021-04-20 01:29:15 【问题描述】：当你点击CardView时，应该会出现DialogFragment，但是应用程序崩溃了，在日志中写下以下内容
Process: com.example.testfuntura, PID: 15385
java.lang.ClassCastException: android.view.ContextThemeWrapper cannot be cast to androidx.appcompat.app.AppCompatActivity
at com.example.testfuntura.Attraction.AdapterAttractionsPackageOffer.lambda$onBindViewHolder$0(AdapterAttractionsPackageOffer.java:56)
at com.example.testfuntura.Attraction.-$$Lambda$AdapterAttractionsPackageOffer$4cZEQxk2beWA40yZmNkr6ZJp7o8.onClick(lambda)
at android.view.View.performClick(View.java:5692)
at android.view.View$PerformClick.run(View.java:22596)
我的Adapter
public class AdapterAttractionsPackageOffer extends RecyclerView.Adapter<AdapterAttractionsPackageOffer.AttractionsViewHolderPackageOffer>
public ArrayList<ItemPOA> mFavList;
public AdapterAttractionsPackageOffer(ArrayList<ItemPOA> favList)
mFavList = favList;
@NonNull
@Override
public AttractionsViewHolderPackageOffer onCreateViewHolder(ViewGroup parent, int viewType)
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_attraction_package_offer, parent, false);
return new AttractionsViewHolderPackageOffer(v);
public static class AttractionsViewHolderPackageOffer extends RecyclerView.ViewHolder
public ImageView card_image_1;
public TextView Package_offer_title;
public CardView Card;
public AttractionsViewHolderPackageOffer(View itemView)
super(itemView);
Card = itemView.findViewById(R.id.att_po);
card_image_1 = itemView.findViewById(R.id.img_po);
Package_offer_title = itemView.findViewById(R.id.tex);
@SuppressLint("LongLogTag")
@Override
public void onBindViewHolder(AttractionsViewHolderPackageOffer holder, int position)
ItemPOA currentItem = mFavList.get(position);
holder.Package_offer_title.setText(currentItem.get_Package_offer_title());
holder.Card.setOnClickListener(v ->
DialogPOA dialog = new DialogPOA();
dialog.show(((AppCompatActivity) v.getContext()).getSupportFragmentManager(), "item");
Bundle bundle1 = new Bundle();
bundle1.putString("title_po", currentItem.get_Package_offer_title());
bundle1.putString("description_po", currentItem.get_Package_offer_description());
bundle1.putString("cost_po", currentItem.get_Package_offer_cost());
dialog.setArguments(bundle1);
);
holder.getAdapterPosition();
@Override
public int getItemCount()
return mFavList.size();
我有一个类似的Adapter，但是当被调用时，一切正常，也就是说，问题不在于DialogFragment，因为从另一个片段调用时一切正常。
Fragment 所在的CardView
public class FragmentAtt extends Fragment
ArrayList<ItemPOA> mFavList;
String URL = "http://qqqqqqqqq.mcdir.ru/dbpo.php";
RecyclerView mRec;
RecyclerView.LayoutManager recyclerViewlayoutManager;
RecyclerView.Adapter recyclerViewadapter;
//ImageView GET_PO_IMG;
String GET_PO_TITLE = "title_po";
String GET_PO_DESCRIPTION = "description_po";
String GET_PO_COST = "cost_po";
RequestQueue requestQueue;
JsonArrayRequest jsonArrayRequest;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setRetainInstance(true);
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
View view = inflater.inflate(R.layout.fragment_test_attraction, container, false);
TabLayout tabLayout = view.findViewById(R.id.tab);
ViewPager viewPager = view.findViewById(R.id.pager);
setupViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
return view;
@Override
public void onViewCreated(@NonNull final View view, @Nullable Bundle savedInstanceState)
mRec = requireView().findViewById(R.id.rec_po);
mFavList = new ArrayList<>();
recyclerViewadapter = new AdapterAttractionsPackageOffer(mFavList);
recyclerViewlayoutManager = new LinearLayoutManager(getContext());
mRec.setHasFixedSize(true);
mRec.setLayoutManager(recyclerViewlayoutManager);
mRec.setAdapter(recyclerViewadapter);
JSON_DATA_WEB_CALL2_RINK();
//recyclerViewlayoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.HORIZONTAL, false);
//SnapHelper snapHelper = new GravitySnapHelper(Gravity.START);
//snapHelper.attachToRecyclerView(mRec);
private void setupViewPager(ViewPager viewPager)
PagerAdapter adapter = new PagerAdapter(getChildFragmentManager());
adapter.addFragment(new FragmentAttractionRecyclerView(), "Аттракционы");
adapter.addFragment(new FragmentAttractionRecyclerView(), "Видеоигры");
viewPager.setAdapter(adapter);
public void JSON_DATA_WEB_CALL2_RINK()
jsonArrayRequest = new JsonArrayRequest(URL,
this::JSON_PARSE_DATA_AFTER_WEBCALL_RINK,
error ->
Log.e("Volley", error.toString()))
@Override
protected Response<JSONArray> parseNetworkResponse(NetworkResponse response)
try
Cache.Entry cacheEntry = HttpHeaderParser.parseCacheHeaders(response);
if (cacheEntry == null)
cacheEntry = new Cache.Entry();
final long cacheExpired = 24 * 60 * 60 * 1000; // in 24 hours this cache entry expires completely
long now = System.currentTimeMillis();
final long ttl = now + cacheExpired;
cacheEntry.data = response.data;
cacheEntry.softTtl = now;
cacheEntry.ttl = ttl;
String headerValue;
headerValue = response.headers.get("Date");
if (headerValue != null)
cacheEntry.serverDate = HttpHeaderParser.parseDateAsEpoch(headerValue);
headerValue = response.headers.get("Last-Modified");
if (headerValue != null)
cacheEntry.lastModified = HttpHeaderParser.parseDateAsEpoch(headerValue);
cacheEntry.responseHeaders = response.headers;
final String jsonString = new String(response.data,
HttpHeaderParser.parseCharset(response.headers));
return Response.success(new JSONArray(jsonString), cacheEntry);
catch (UnsupportedEncodingException | JSONException e)
return Response.error(new ParseError(e));
;
requestQueue = Volley.newRequestQueue(requireContext());
requestQueue.add(jsonArrayRequest);
public void JSON_PARSE_DATA_AFTER_WEBCALL_RINK(JSONArray array)
mFavList.clear();
for (int i = 0; i < array.length(); i++)
ItemPOA GetDataAdapter2 = new ItemPOA();
JSONObject json;
try
json = array.getJSONObject(i);
GetDataAdapter2.set_Package_offer_title(json.getString(GET_PO_TITLE));
GetDataAdapter2.set_Package_offer_description(json.getString(GET_PO_DESCRIPTION));
GetDataAdapter2.set_Package_offer_cost(json.getString(GET_PO_COST));
catch (JSONException e)
e.printStackTrace();
mFavList.add(GetDataAdapter2);
recyclerViewadapter = new AdapterAttractionsPackageOffer(mFavList);
mRec.setAdapter(recyclerViewadapter);
一个具有相同功能的Adapter，但为什么会起作用，解释一下区别？
public class AdapterSkatingRinkSchedule_2 extends RecyclerView.Adapter<AdapterSkatingRinkSchedule_2.SkatingRinkScheduleViewHolder>
public ArrayList<ItemSkatingRinkSchedule_2> mSkatingRinkScheduleList;
public AdapterSkatingRinkSchedule_2(ArrayList<ItemSkatingRinkSchedule_2> SkatingRinkScheduleList)
mSkatingRinkScheduleList = SkatingRinkScheduleList;
@NonNull
@Override
public SkatingRinkScheduleViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_srs, parent, false);
return new SkatingRinkScheduleViewHolder(v);
public static class SkatingRinkScheduleViewHolder extends RecyclerView.ViewHolder
public TextView number_srs, start_time_srs, end_time_srs, cost_1_srs, cost_2_srs;
public LinearLayout ll_main;
public SkatingRinkScheduleViewHolder(View itemView)
super(itemView);
ll_main = itemView.findViewById(R.id.ll_main);
number_srs = itemView.findViewById(R.id.number_srs);
start_time_srs = itemView.findViewById(R.id.start_time_srs);
end_time_srs = itemView.findViewById(R.id.end_time_srs);
cost_1_srs = itemView.findViewById(R.id.cost_1_srs);
cost_2_srs = itemView.findViewById(R.id.cost_2_srs);
@SuppressLint("LongLogTag")
@Override
public void onBindViewHolder(SkatingRinkScheduleViewHolder holder, int position)
ItemSkatingRinkSchedule_2 currentItem = mSkatingRinkScheduleList.get(position);
holder.number_srs.setText(currentItem.get_session_number());
holder.start_time_srs.setText(currentItem.get_session_start());
holder.end_time_srs.setText(currentItem.get_session_end());
holder.cost_1_srs.setText(currentItem.get_weekdays());
holder.cost_2_srs.setText(currentItem.get_weekends_and_holidays());
holder.ll_main.setOnClickListener(v ->
DialogSkatingRinkSchedule dialogSRS = new DialogSkatingRinkSchedule();
dialogSRS.show(((AppCompatActivity) v.getContext()).getSupportFragmentManager(), "item");
Bundle bundle2 = new Bundle();
bundle2.putString("number", currentItem.get_session_number());
bundle2.putString("start", currentItem.get_session_start());
bundle2.putString("end", currentItem.get_session_end());
bundle2.putString("w", currentItem.get_weekdays());
bundle2.putString("wah", currentItem.get_weekends_and_holidays());
dialogSRS.setArguments(bundle2);
);
holder.getAdapterPosition();
@Override
public int getItemCount()
return mSkatingRinkScheduleList.size();
【问题讨论】：
【参考方案1】：java.lang.ClassCastException: android.view.ContextThemeWrapper 无法转换为 androidx.appcompat.app.AppCompatActivity
在这里，您将context 转换为AppCompatActivity，但实际上是Activity is not a Context
你有两个选择来解决这个问题：
第一个选项：在持有RecyclerView的activity/fragment之间创建一个监听器接口，在那个activity中实现它，并在CardViewonClickListeneronClick()内触发它的回调回调。
第二个选项： 更改AdapterAttractionsPackageOffer 适配器的构造函数签名以接受FragmentManager 实例；将其保存为如下所示的类字段，并将其反映在适配器的实例化上
public class AdapterAttractionsPackageOffer extends RecyclerView.Adapter<AdapterAttractionsPackageOffer.AttractionsViewHolderPackageOffer>
public ArrayList<ItemPOA> mFavList;
private FragmentManager fragmentMgr;
public AdapterAttractionsPackageOffer(ArrayList<ItemPOA> favList, FragmentManager fManger)
mFavList = favList;
fragmentMgr = fManger;
//......... suppressed code
@SuppressLint("LongLogTag")
@Override
public void onBindViewHolder(AttractionsViewHolderPackageOffer holder, int position)
ItemPOA currentItem = mFavList.get(position);
holder.Package_offer_title.setText(currentItem.get_Package_offer_title());
holder.Card.setOnClickListener(v ->
DialogPOA dialog = new DialogPOA();
dialog.show(fragmentMgr, "item");
Bundle bundle1 = new Bundle();
bundle1.putString("title_po", currentItem.get_Package_offer_title());
bundle1.putString("description_po", currentItem.get_Package_offer_description());
bundle1.putString("cost_po", currentItem.get_Package_offer_cost());
dialog.setArguments(bundle1);
);
holder.getAdapterPosition();
//......... suppressed code
【讨论】：
我更新了问题，你能看出Adapter和有什么区别吗？我只是不明白为什么我重复同样的事情，但它不起作用
我看不出两者之间的区别 .. 但选角不太对 .. 对话框是否相同？
不，dialog 其他，奇怪的是它不适用于此适配器以上是关于DialogFragment 调用失败的主要内容，如果未能解决你的问题，请参考以下文章
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