android – Spinner：ArrayAdapter.createViewFromResource中的NullPointerException

概述我用这样的代码创建了一些Spinners： if (dyn_list_id[i]==null){ String[] form_ids = db.getEntireColumn(list_table_name[i], "form_label_id"); String[] spinnerArray = new String[form_ids.length]; 我用这样的代码创建了一些Spinners：

if (dyn_List_ID[i]==null){         String[] form_IDs = db.getEntireColumn(List_table_name[i],"form_label_ID");         String[] spinnerArray = new String[form_IDs.length];         for (int k=0;k<form_IDs.length;k++){                 spinnerArray[k] = db.getFromLanguagetable(language_short_name,List_table_name[i],form_IDs[k]);                 System.out.println("Spinner Array "+spinnerArray[k]);         }         product_spinner[i] = new Spinner(vIEwToload.getContext());  //First Spinner         product_spinner[i].setLayoutParams(lp_spinner);         product_spinner[i].setBackgroundResource(R.drawable.spinner_selector);         ArrayAdapter spinnerArrayAdapter = new ArrayAdapter(vIEwToload.getContext(),com.Orange.R.layout.my_spinner_textvIEw,spinnerArray);         spinnerArrayAdapter.setDropDownVIEwResource(R.layout.multiline_spinner_dropdown_item);         product_spinner[i].setAdapter(spinnerArrayAdapter);         this.SpinnerFIElds.add(product_spinner[i]);        linear_layout[i].addVIEw(product_spinner[i]);        tablerow_product[i].addVIEw(linear_layout[i]);        themes_tableLayout.addVIEw(tablerow_product[i],new tableLayout.LayoutParams(tableRow.LayoutParams.FILL_PARENT,tableRow.LayoutParams.WRAP_CONTENT));    }    else {    String[] spinnerA = new String[item_visible];    int cont=0;    for (int p=0;p<status_itemList.length;p++){         if (status_itemList[p].trim().equals("1")){               spinnerA[cont]=db.getFromLanguagetable(language_short_name,"pr_dyn_List_option",form_label_ID_itemList[p]);               System.out.println("Spinner dinamic array "+spinnerA[cont]);               cont++;               }      }     product_spinner[i] = new Spinner(vIEwToload.getContext()); //second Spinner     product_spinner[i].setLayoutParams(lp_spinner);     product_spinner[i].setBackgroundResource(R.drawable.spinner_selector);     ArrayAdapter spinnerAdapter = new ArrayAdapter(vIEwToload.getContext(),spinnerA);       spinnerAdapter.setDropDownVIEwResource(com.Orange.R.layout.multiline_spinner_dropdown_item);    product_spinner[i].setAdapter(spinnerAdapter);    this.SpinnerFIElds.add(product_spinner[i]);    linear_layout[i].addVIEw(product_spinner[i]);   tablerow_product[i].addVIEw(linear_layout[i]);   themes_tableLayout.addVIEw(tablerow_product[i],tableRow.LayoutParams.WRAP_CONTENT));           }

它在屏幕上看起来很好但是当我点击它时我得到这个错误：

15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime  java.lang.NullPointerException15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.ArrayAdapter.createVIEwFromresource(ArrayAdapter.java:355)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.ArrayAdapter.getDropDownVIEw(ArrayAdapter.java:376)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.Spinner$DropDownAdapter.getDropDownVIEw(Spinner.java:329)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.Spinner$DropDownAdapter.getVIEw(Spinner.java:325)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.AbsListVIEw.obtainVIEw(AbsListVIEw.java:1294)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.ListVIEw.measureHeightOfChildren(ListVIEw.java:1198)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.ListVIEw.onMeasure(ListVIEw.java:1109)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.vIEw.VIEw.measure(VIEw.java:8171)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:3132)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.linearLayout.measureChildBeforeLayout(linearLayout.java:1012)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.linearLayout.measureVertical(linearLayout.java:381)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.linearLayout.onMeasure(linearLayout.java:304)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at com.androID.internal.Widget.WeightedlinearLayout.onMeasure(WeightedlinearLayout.java:60)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:245)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.vIEw.VIEwRoot.performTraversals(VIEwRoot.java:801)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.vIEw.VIEwRoot.handleMessage(VIEwRoot.java:1727)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.os.Handler.dispatchMessage(Handler.java:99)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.os.Looper.loop(Looper.java:123)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at androID.app.ActivityThread.main(ActivityThread.java:4627)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at java.lang.reflect.Method.invokeNative(Native Method)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at java.lang.reflect.Method.invoke(Method.java:521)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)15:53:22.040    8716    com.Orange  ERROR   AndroIDRuntime      at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:626)

第一个Spinner添加工作正常,但对于第二个Spinner,我得到了这个错误.
我不知道为什么我在Adapterarray.createVIEwFromresources上得到一个nullpointer,因为我不使用这个方法.我的错误在哪里？

解决方法 您在提供给适配器的数据列表/数组中有空值. ArrayAdapter将为每一行调用此数据的toString,如果为null,则抛出NullPointerException.

确保spinnerA中没有空值(我认为这是第二个Spinner的数据(！??！)).

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