Databases
StackOverflow2013
Postsdbo
POwhy cannot access arraylist from other class?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POwhy cannot access arraylist from other class?
    primarykey
    data
    text
    <p>In webservice class, it will retrieve database from online and put into list:</p> <pre><code>public List&lt;List_NewsComment&gt; allCommentList; public void GetCommentNews( final int gCommentNewsID) { Thread networkThread=new Thread(){ @Override public void run(){ try { SoapObject request= new SoapObject(NAMESPACE,get_Comment_METHOD_NAME); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); HttpTransportSE androidHttpTransportSE= new HttpTransportSE(URL,60000); request.addProperty("itemid", gCommentNewsID); envelope.setOutputSoapObject(request); androidHttpTransportSE.call(get_Comment_SOAP_ACTION, envelope); SoapObject result=(SoapObject)envelope.bodyIn; RetrieveFromSoap( result); } catch(Exception ex) { ex.printStackTrace(); } } }; networkThread.start(); } public List&lt;List_NewsComment&gt; RetrieveFromSoap(SoapObject soap) { allCommentList= new ArrayList&lt;List_NewsComment&gt;(); Vector&lt;Object&gt; property2 = extracted(soap); for (int i = 0; i&lt; property2.size();i++){ SoapObject getPropertyD=(SoapObject)property2.get(i); List_NewsComment addcomment= new List_NewsComment(); addcomment.setcommentDate(getPropertyD.getProperty("date").toString()); addcomment.setUserName( getPropertyD.getProperty("name").toString()); addcomment.setCommentContent(getPropertyD.getProperty("comment").toString()); allCommentList.add(addcomment); } webservice.allCommentList.size(); &lt;-- can call here no problem return allCommentList; } private static Vector&lt;Object&gt; extracted(SoapObject soap) { return (Vector&lt;Object&gt;)soap.getProperty(0); } </code></pre> <p>In Main Activity class, i want to check the size of list:</p> <pre><code>Database_WebService webservice = new Database_WebService(this); webservice.GetCommentNews(newsid); webservice.allCommentList.size(); &lt;-- cannot call here, what is the problem </code></pre> <p>It returns me <code>nullpointerexception</code>.</p> <p>What is the problem????</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USDaniel Imms
    1. USAlan Lai
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POwhy cannot access arraylist from other class?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COplease show your logcat
      singulars
      1. POwhy cannot access arraylist from other class?
      1. USthepoosh
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload