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POHow to get context in android Service class
 

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    <p>I am getting the following error when i try to read a XML file from the memory and into an object. Seems like problem with getting the Context. Can anyone tell me whats wrong with my code?</p> <p><strong>Code:</strong></p> <pre><code>public class WifiScanning extends Service { private static final String TAG = "WifiScanning"; private Timer timer; public int refreshRate; public WifiScanning() { super(); Configuration config = new Configuration(); SAXParserFactory spf = SAXParserFactory.newInstance(); SAXParser sp; XMLReader xr = null; DataHandler dataHandler = null; try { sp = spf.newSAXParser(); xr = sp.getXMLReader(); dataHandler = new DataHandler(); xr.setContentHandler(dataHandler); xr.parse(new InputSource(this.openFileInput("config.xml"))); } catch (ParserConfigurationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SAXException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } config = dataHandler.getConfig(); refreshRate = Integer.parseInt(config.getMapRefreshRate()); // TODO Auto-generated constructor stub } private TimerTask updateTask = new TimerTask() { @Override public void run() { Log.i(TAG, "Timer task doing work"); } }; @Override public IBinder onBind(Intent intent) { // TODO Auto-generated method stub return null; } @Override public void onCreate() { super.onCreate(); Log.i(TAG, "Service creating"); timer = new Timer("TweetCollectorTimer"); Log.i(TAG, "Refresh Rate: "+ String.valueOf(refreshRate)); timer.schedule(updateTask, 0, 3000L); } @Override public void onDestroy() { super.onDestroy(); Log.i(TAG, "Service destroying"); if (timer != null){ timer.cancel(); timer.purge(); timer = null; } } public void onStop() { Log.i(TAG, "Service destroying"); if (timer != null){ timer.cancel(); timer.purge(); timer = null; } } } </code></pre> <p><strong>LogCat:</strong></p> <pre><code>10-01 11:08:49.804: ERROR/AndroidRuntime(21514): java.lang.RuntimeException: Unable to instantiate service android.wps.WifiScanning: java.lang.NullPointerException 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2764) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at android.app.ActivityThread.access$3200(ActivityThread.java:119) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1917) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at android.os.Handler.dispatchMessage(Handler.java:99) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at android.os.Looper.loop(Looper.java:123) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at android.app.ActivityThread.main(ActivityThread.java:4363) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at java.lang.reflect.Method.invokeNative(Native Method) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at java.lang.reflect.Method.invoke(Method.java:521) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at dalvik.system.NativeStart.main(Native Method) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): Caused by: java.lang.NullPointerException 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at android.content.ContextWrapper.openFileInput(ContextWrapper.java:152) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at android.wps.WifiScanning.&lt;init&gt;(WifiScanning.java:52) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at java.lang.Class.newInstanceImpl(Native Method) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at java.lang.Class.newInstance(Class.java:1479) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2761) 10-01 11:08:49.804: ERROR/AndroidRuntime(21514): ... 10 more </code></pre>
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    1. CODid you try IntentService. It is much easier to handle. Btw, Service extends Context.
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    2. CObut can this class read file from the memory?
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