android - 从 Google Play 但不是从 Android Studio 运行时出现 NullPointerException

Question

我遇到了一个大问题，我不知道发生了什么，我已经将应用程序上传到 Play 商店，因为当我在模拟器或什至在我的真实设备上运行它时它没有崩溃，但现在当我从 Google Play 下载它时，它说:

java.lang.NullPointerException: 
  at com..onBindViewHolder (ChooseCard.java)
  or                     .onCreateViewHolder (ChooseCard.java)
  at com..onBindViewHolder (ChooseCard.java)
  or                     .onCreateViewHolder (ChooseCard.java)
  at com.firebase.ui.database.FirebaseRecyclerAdapter.getItemCount (FirebaseRecyclerAdapter.java)
  or                     .onBindViewHolder (FirebaseRecyclerAdapter.java)
  or                     .onChildChanged (FirebaseRecyclerAdapter.java)
  or                     .onError (FirebaseRecyclerAdapter.java)
  at com.yarolegovich.discretescrollview.InfiniteScrollAdapter.access$100 (InfiniteScrollAdapter.java)
  or                     .getItemCount (InfiniteScrollAdapter.java)
  or                     .getItemViewType (InfiniteScrollAdapter.java)
  or                     .onAttachedToRecyclerView (InfiniteScrollAdapter.java)
  or                     .onBindViewHolder (InfiniteScrollAdapter.java)
  or                     .onCreateViewHolder (InfiniteScrollAdapter.java)
  or                     .wrap (InfiniteScrollAdapter.java)

这个问题已经好几天了，我找不到，你能帮帮我吗？

这是我的build.gradle 实现

implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.0'
implementation 'com.android.support:design:27.1.1'
implementation 'com.intuit.sdp:sdp-android:1.0.4'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
implementation 'com.android.support:cardview-v7:27.1.1'
implementation 'com.google.firebase:firebase-core:15.0.0'
implementation 'com.google.firebase:firebase-auth:15.0.0'
implementation 'com.google.android.gms:play-services-auth:15.0.0'
implementation 'com.google.firebase:firebase-database:15.0.0'
implementation 'com.anjlab.android.iab.v3:library:1.0.44'
implementation 'com.firebaseui:firebase-ui-database:3.3.1'
implementation 'com.onesignal:OneSignal:3.7.1'
implementation 'com.yarolegovich:discrete-scrollview:1.3.2'
implementation 'com.pranavpandey.android:dynamic-toasts:0.9.0'
implementation 'pl.droidsonroids.gif:android-gif-drawable:1.2.11'
implementation 'com.google.android.gms:play-services-analytics:15.0.0'
.....
 dependencies {
        classpath 'com.android.tools.build:gradle:3.1.2'
        classpath 'com.google.gms:google-services:3.2.1'

编辑

我已经在 Google Play 上更新了我的应用程序，但没有任何反应，仍然在同一个 Activity 上崩溃，我现在知道如何调试它，问题是当我从Google Play，在模拟器上(即使在新的模拟器设备上也不会崩溃)和我的真实设备上。

作为@Marcos Vascondelos说，我做了 Build > Genereate Signed APK > get the app-release.apk install it on my device and the problem is that I can't login it is going to this method :

 @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            try {
                // Google Sign In was successful, authenticate with Firebase
                GoogleSignInAccount account = task.getResult(ApiException.class);
                firebaseAuthWithGoogle(account);
            } catch (ApiException e) {
                // Google Sign In failed, update UI appropriately
                Log.w(TAG, "Google sign in failed", e.getCause());
                Toast with e.getCause is null
            }
        }
    }

如果您想查看我如何登录才能不在这个问题上添加更多代码，我将在这个 GitHubGist 上添加

我读到它可能是 SHA-1 的问题，但我不知道为什么在模拟器上没问题，设备没问题，谷歌播放没问题，但如果我直接安装 .apk，它说 null。

最后编辑

我看到问题不在 Firebase 调用上，而是在填充列表上，我的意思是产品被正确捕获，但是当我尝试放入列表时它崩溃了

我的 FirebaseRecyclerOptions 适配器看起来像

 final FirebaseRecyclerOptions< CardPOJO > options =
                    new FirebaseRecyclerOptions.Builder< CardPOJO >()
                            .setQuery(products_ref, CardPOJO.class)
                            .build();



            adapter = new   FirebaseRecyclerAdapter< CardPOJO, CardHolder>(options) {
                @Override
                public CardHolder onCreateViewHolder(ViewGroup parent, int viewType) {
                    //inflate the single recycler view layout(item)
                    View view = LayoutInflater.from(parent.getContext())
                            .inflate(R.layout.card_product, parent, false);
                    final CardHolder cardViewHolder = new CardHolder(view);
                    return cardViewHolder;
                }



                @Override
                public void onDataChanged() {
                    super.onDataChanged();
                    if(progressDialog!=null)progressDialog.dismiss();initViews();
                }


                @Override
                protected void onBindViewHolder(final CardHolder holder, int position, final CardPOJO model) {
                    holder.itemView.setSelected(0== position); ////where you are in the list
                    holder.getLayoutPosition();
                    switch (model.getState()){
                        case "free":
                            holder.card_image.setImageResource();
                            break;
                        case "not_free":
                            if(userOwnsProduct(model.getProduct_id())){
                                holder.card_image.setImageResource();
                            }
                            else{
                                holder.card_image.setImageResource();
                            }

                            break;
                        default:
                            break;
                    }
                    holder.view.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            if(model.getState().equals("free")){
                                //normal stuff1

                            }
                            else{
                                if (!readyToPurchase) {
                                    DynamicToast.makeError(mContext,"Problems with Google Play",Toast.LENGTH_SHORT).show();
                                    return;
                                }
                                root_ref.child("PurchasedProducts").child(currentUser).addValueEventListener(new ValueEventListener() {
                                    @Override
                                    public void onDataChange(DataSnapshot dataSnapshot) {
                                        if(dataSnapshot.hasChild(model.getProduct_id())){
                                            //Normal stuff
                                        }
                                        else{
                                            bp.purchase((Activity) mContext,model.getProduct_id());
                                        }
                                    }

                                    @Override
                                    public void onCancelled(DatabaseError databaseError) {

                                    }
                                });

                            }

                        }
                    });


                }

            };
            adapter.startListening();



            infiniteAdapter = InfiniteScrollAdapter.wrap(adapter);
            itemPicker.setAdapter(infiniteAdapter);
            //.setItemTransitionTimeMillis(DiscreteScrollViewOptions.getTransitionTime());
            itemPicker.setItemTransformer(new ScaleTransformer.Builder()
                    .setMinScale(0.5f)
                    .build());

Answer 1

记住，总是检查组件是否为空。比执行你的代码。示例:

if ("your_component" != null){
//your code
}