Question

我正在使用改造API。请检查以下屏幕截图：对话框中有类别和子类别列表。单击“确定”按钮后，我必须获取主要类别ID，子类别ID和子类别价格。我使用了sparseBooleanArray。我可以获取main_category id，但是在尝试获取sub_category_id时出现空指针异常。请帮忙。以下附加代码：

MainAdapter：

 holder.select_category.setTag(position);
        holder.select_category.setChecked(mSparseBooleanArray.get(position));
        holder.select_category.setOnCheckedChangeListener(mCheckedChangeListener);

        sublist = new ArrayList<>();
        sublist=chat_list.get(position).getSubCategory();
        subcategoryAdapter = new SubCategoryAdapter(context, sublist);
        holder.recyclerView.setAdapter(subcategoryAdapter);
        holder.recyclerView.setLayoutManager(new LinearLayoutManager(context));

        holder.category.setText(chat_list.get(position).getMainCategoryName());


    }
    CompoundButton.OnCheckedChangeListener mCheckedChangeListener = new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            mSparseBooleanArray.put((Integer) buttonView.getTag(), isChecked);

        }
    };
    public ArrayList<String> getCheckedItems() {
        ArrayList<String> mTempArry = new ArrayList<String>();

        for(int i=0;i<chat_list.size();i++) {
            if(mSparseBooleanArray.get(i)) {
                mTempArry.add(chat_list.get(i).getMainCategoryId());
                //mTempArry.add(sublist.get(i).getSubCategoryId());
                Log.e("MAINID",chat_list.get(i).getMainCategoryId());
            }
        }

        return mTempArry;
    }

SubAdapter：

  public void onBindViewHolder(final DataObjectHolder holder, final int position) {

        holder.subcategory.setText(sublist.get(position).getSubCategoryName());
        Log.e("Sub Cat Name",sublist.get(position).getSubCategoryName());

        holder.subcat.setTag(position);
        holder.subcat.setChecked(mSparseBooleanArray.get(position));
        holder.subcat.setOnCheckedChangeListener(mCheckedChangeListener);
        cost_per_hr=holder.price.getText().toString();


    }

    CompoundButton.OnCheckedChangeListener mCheckedChangeListener = new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            mSparseBooleanArray.put((Integer) buttonView.getTag(), isChecked);
        }
    };
    public ArrayList<String> getSubCheckedItems() {
        ArrayList<String> mTempArry = new ArrayList<String>();

        for(int i=0;i<sublist.size();i++) {
            if(mSparseBooleanArray.get(i)) {
                Log.e("TAG","INSIDE SUB");
                mTempArry.add(sublist.get(i).getSubCategoryId());
                mTempArry.add(cost_per_hr);
                Log.e("SUBID",sublist.get(i).getSubCategoryId()+"::"+cost_per_hr);
            }
        }

        return mTempArry;
    }
    @Override
    public int getItemCount() {
        return sublist.size();
    }

活动：

 submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                category.dismiss();

                ArrayList<String> selectedItems = categoryAdapter.getCheckedItems();
                try {
                    try {
                        for (int i = 0; i <= selectedItems.size(); i++) {

                            Log.e("Main", selectedItems.get(i));

                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                } catch (NumberFormatException e) {
                    e.printStackTrace();
                }

                ArrayList<String> selectedItems_one = subCategoryAdapter.getSubCheckedItems();
                try {
                    for (int i = 0; i <= selectedItems_one.size(); i++) {

                        Log.e("Sub", selectedItems_one.size()+"");

                    }
                } catch (NumberFormatException e) {
                    e.printStackTrace();
                }
            }
        });

单击提交按钮时，我得到了getSubcheckedItems（）方法的nullpointer异常。

错误：

     java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.ArrayList com.app.qn.adapter.SubCategoryAdapter.getSubCheckedItems()' on a null object reference
        at com.app.qn.activity.EditProfileActivity$3.onClick(EditProfileActivity.java:303)
        at android.view.View.performClick(View.java:5675)
        at android.view.View$PerformClick.run(View.java:22651)
        at android.os.Handler.handleCallback(Handler.java:836)
        at android.os.Handler.dispatchMessage(Handler.java:103)
        at android.os.Looper.loop(Looper.java:208)
        at android.app.ActivityThread.main(ActivityThread.java:6267)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
2019-04-17 17:48:13.793 19440-21355/com.app.qn E/NativeCrypto: ssl=0x774a444680 cert_verify_callback x509_store_ctx=0x772d7e8a28 arg=0x0
2019-04-17 17:48:13.793 19440-21355/com.app.qn E/NativeCrypto: ssl=0x774a444680 cert_verify_callback calling verifyCertificateChain authMethod=ECDHE_RSA

Answer 1

当您选择“ Designer”以外的其他选项时，我想您将获得空指针异常异常这是因为，从您的屏幕快照中，我只能看到Designer选项具有子类别，并且您已根据项目进行了初始化。

对于除“设计器”之外的其他选项，您没有任何子类别，并且子类别适配器未初始化。

这导致SELECT coalesce(w.words[array_length(w.words, 1) - 2] || ' ', '') || coalesce(w.words[array_length(w.words, 1) - 1] || ' ', '') || coalesce(w.words[array_length(w.words, 1)], '') FROM mytable t CROSS JOIN LATERAL (SELECT regexp_split_to_array(t."name", ' ') words) w;

您的空指针表示您的子适配器为空。

要处理nullpointerexception，请首先检查您的子类别适配器为null还是不进行其他操作。

当然，单击提交按钮时，null pointer exception对象没有被初始化。确保适配器初始化在范围内。

尝试在翻新api中使用sparsebooleanarray从JSON子数组中获取ID时发生NullpointerException

1 个答案: