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POAndroid Handler NullPointerException (while sending Message)
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  1. POAndroid Handler NullPointerException (while sending Message)
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    copied!<p>I have a problem with <code>Handler</code>. This is what my app does:</p> <ol> <li>New Thread is created.</li> <li>Thread downloads data, then puts them in a message.</li> <li>Thread sends message to handler.</li> </ol> <p>And here the problem begins. According to logs app throws <code>NullPointerException</code> in this line:</p> <pre><code>replyTo.sendMessage(msg); </code></pre> <p>Sometimes everything is OK, sometimes it's not. Handler is placed before creating a new thread. This is code for handler:</p> <pre><code>Handler responseHandler = new Handler() { public void handleMessage(Message msg) { ad.dismiss(); populateListWithVideos(msg); }; }; </code></pre> <p>Do you have any ideas why is this happening?</p> <p>EDIT: Here's my Logcat. How to read it:</p> <ul> <li>"Powstała nowa biblioteka" - new ArrayList has been created</li> <li>"Array" - JSONArray has been recieved</li> <li>"Obiekt"/"Tytuł" + number - Object/String from JSONArray has been recieved (number - an object number)</li> <li>"Dodano do biblioteki" - strings recieved from Object have been added to array as Video</li> <li>"Nowa biblioteka" - new Library created from ArrayList</li> <li>"Serializable" - Library serialized into bundle</li> <li>"Otrzymano wiadomość" - Message obtained using Message.obtain()</li> <li>"Ustalono wiadomość" - Bundle put into Message using Message.setData()</li> <li><p>"Wysłano wiadomość" - Message sent to Handler</p> <pre><code>02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Powstała nowa biblioteka 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Array 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Obiekt0 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Tytuł0 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Dodano do biblioteki 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Obiekt1 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Tytuł1 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Dodano do biblioteki 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Obiekt2 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Tytuł2 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Dodano do biblioteki 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Obiekt3 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Tytuł3 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Dodano do biblioteki 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Obiekt4 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Tytuł4 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Dodano do biblioteki 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Obiekt5 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Tytuł5 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Dodano do biblioteki 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Obiekt6 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Tytuł6 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Dodano do biblioteki 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Obiekt7 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Tytuł7 02-07 13:17:13.885: D/Ignaś TV(24913): Thread-6447| Dodano do biblioteki ... 02-07 13:17:13.905: D/Ignaś TV(24913): Thread-6447| Obiekt48 02-07 13:17:13.905: D/Ignaś TV(24913): Thread-6447| Tytuł48 02-07 13:17:13.905: D/Ignaś TV(24913): Thread-6447| Dodano do biblioteki 02-07 13:17:13.905: D/Ignaś TV(24913): Thread-6447| Obiekt49 02-07 13:17:13.905: D/Ignaś TV(24913): Thread-6447| Tytuł49 02-07 13:17:13.905: D/Ignaś TV(24913): Thread-6447| Dodano do biblioteki 02-07 13:17:13.905: D/Ignaś TV(24913): Thread-6447| Nowa biblioteka 02-07 13:17:13.905: D/Ignaś TV(24913): Thread-6447| Serializable 02-07 13:17:13.905: D/Ignaś TV(24913): Thread-6447| Otrzymano wiadomość 02-07 13:17:13.905: D/Ignaś TV(24913): Thread-6447| Ustalono wiadomość 02-07 13:17:13.905: E/Ignaś TV(24913): Thread-6447| Koniec listy //Error 02-07 13:17:13.905: E/Ignaś TV(24913): java.lang.NullPointerException 02-07 13:17:13.905: E/Ignaś TV(24913): at com.ignas.ignastv.service.task.GetData.run(GetData.java:142) 02-07 13:17:13.905: E/Ignaś TV(24913): at java.lang.Thread.run(Thread.java:856) </code></pre></li> </ul>
 

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