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POcant understand Null pointer exception in android app
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  1. POcant understand Null pointer exception in android app
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    copied!<p>I wrote a code as follows but cant understand why is the code returning a null pointer exception?</p> <pre><code>public void createXML() { try { //FileOutputStream f1 = new FileOutputStream("Userdata_Boombastic.xml"); FileOutputStream f1 = openFileOutput("Userdata_Boombastic.xml", Context.MODE_PRIVATE); //OutputStreamWriter out = new OutputStreamWriter(f1); XmlSerializer xmlSerializer = Xml.newSerializer(); StringWriter writer = new StringWriter(); xmlSerializer.setOutput(writer); xmlSerializer.startDocument("UTF-8",true); xmlSerializer.endDocument(); xmlSerializer.flush(); String dataWrite=writer.toString(); f1.write(dataWrite.getBytes()); f1.close(); } /*catch (FileNotFoundException e) { // TODO Auto-generated catch block Log.e("FileNotFoundException", e.toString()); e.printStackTrace(); }*/ catch (IllegalArgumentException e) { // TODO Auto-generated catch block Log.e("~~IllegalArgumentException~~", e.toString()); e.printStackTrace(); } catch (IllegalStateException e) { // TODO Auto-generated catch block Log.e("~~IllegalStateException~~", e.toString()); e.printStackTrace(); } /*catch (IOException e) { // TODO Auto-generated catch block Log.e("IOEXCEPTION", e.toString()); e.printStackTrace(); }*/ catch (Exception e) { // TODO Auto-generated catch block Log.e("~~Exception~~", e.toString()); e.printStackTrace(); } 08-27 18:50:50.310: E/~~Exception~~(31487): java.lang.NullPointerException 08-27 18:50:57.800: E/~~Exception~~(31487): java.lang.NullPointerException 08-27 18:51:00.430: E/~~Exception~~(31487): java.lang.NullPointerException 08-27 18:53:28.050: E/ExternalAccountType(30234): Unsupported attribute readOnly 08-27 18:53:29.680: E/ExternalAccountType(30234): Unsupported attribute readOnly 08-27 18:53:32.500: E/~~Exception~~(32054): java.lang.NullPointerException 08-27 18:53:51.670: E/~~Exception~~(32054): java.lang.NullPointerException </code></pre> <p>Mean while for the other explanation I am running this code on my cell by connecting it to the pc.</p> <p>Please help</p> <p>Well the stacktrace did not return anything fruitfull i guess</p> <pre><code>08-27 19:30:31.330: E/ExternalAccountType(30234): Unsupported attribute readOnly 08-27 19:30:31.820: E/ExternalAccountType(30234): Unsupported attribute readOnly 08-27 19:30:36.030: E/~~Exception~~(2732): java.lang.NullPointerException 08-27 19:30:36.150: E/-&gt;&gt;(2732): ~~stacktrace~~ 08-27 19:30:36.150: E/-&gt;&gt;(2732): java.lang.NullPointerException 08-27 19:30:36.150: E/-&gt;&gt;(2732): at android.content.ContextWrapper.openFileOutput(ContextWrapper.java:165) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at com.example.boombastic.WritingXML.createXML(WritingXML.java:76) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at com.example.boombastic.BoombasticPlayer.onCreate(BoombasticPlayer.java:22) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at android.app.Activity.performCreate(Activity.java:4470) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at android.app.ActivityThread.access$600(ActivityThread.java:123) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at android.os.Handler.dispatchMessage(Handler.java:99) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at android.os.Looper.loop(Looper.java:137) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at android.app.ActivityThread.main(ActivityThread.java:4424) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at java.lang.reflect.Method.invokeNative(Native Method) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at java.lang.reflect.Method.invoke(Method.java:511) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:817) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584) 08-27 19:30:36.150: E/-&gt;&gt;(2732): at dalvik.system.NativeStart.main(Native Method) </code></pre>
 

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