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POAndroid remote services: no communication
 

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  1. POAndroid remote services: no communication
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    <p>I am trying to make an Activity run a certain service.</p> <p>I followed the tutorial <a href="http://saigeethamn.blogspot.com/2009/09/android-developer-tutorial-part-9.html" rel="nofollow">here</a> but adapted to my code, and I can't make it work, because when I am invoking the service after starting and binding it to the activity, my Interface (<code>IMyRemoteCallsLoggingService</code>) object does not seem to have the connection properly created.</p> <p>I have been trying to make this work for several days but I can't seem to get rid of a <code>NullPointException</code>.</p> <p>Not sure if I made myself clear, in which case here's the code:</p> <pre><code>public class MtprojectActivity extends Activity { [...] private boolean started = false; private RemoteSmsLoggingServiceConnection SmsLoggingConn = null; private RemoteCallsLoggingServiceConnection CallsLoggingConn = null; private IMyRemoteCallsLoggingService callsLoggingService; private IMyRemoteSmsLoggingService smsLoggingService; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); retrievePreferences(); Button prefBtn = (Button) findViewById(R.id.prefsBtn); prefBtn.setOnClickListener(new OnClickListener() { public void onClick(View v) { // Explicit intent to call the preferences Intent preferencesActivity = new Intent(getBaseContext(), Preferences.class); startActivity(preferencesActivity); } }); } private void retrievePreferences() { // Get the xml/preferences.xml preferences SharedPreferences prefs = PreferenceManager .getDefaultSharedPreferences(getBaseContext()); callsCheckbox = prefs.getBoolean("callsLogChk", false); smsCheckbox = prefs.getBoolean("smsLogChk", false); locationCheckbox = prefs.getBoolean("locationLogChk", false); if (callsCheckbox) { startCallsService(); bindCallsService(); try { invokeCallsService(); } catch (RemoteException e) { e.printStackTrace(); } } else { } private void startCallsService() { if (started) { Toast.makeText(MtprojectActivity.this, "Service already started", Toast.LENGTH_SHORT).show(); } else { Intent i = new Intent(); i.setClassName("app.mtproject", "app.mtproject.CallsLoggingService"); startService(i); started = true; updateCallsServiceStatus(); Log.d(getClass().getSimpleName(), "startService()"); } } private void bindCallsService() { if (CallsLoggingConn == null) { CallsLoggingConn = new RemoteCallsLoggingServiceConnection(); Intent i = new Intent(); i.setClassName("app.mtproject", "app.mtproject.CallsLoggingService"); bindService(i, CallsLoggingConn, Context.BIND_AUTO_CREATE); updateCallsServiceStatus(); Log.d(getClass().getSimpleName(), "bindService()"); } else { Toast.makeText(MtprojectActivity.this, "Cannot bind - service already bound", Toast.LENGTH_SHORT) .show(); } } private void invokeCallsService() throws RemoteException { if (CallsLoggingConn == null) { Toast.makeText(MtprojectActivity.this, "Cannot invoke - service not bound", Toast.LENGTH_SHORT) .show(); } else { callsLoggingService.dumpCallsLog(); TextView t = (TextView) findViewById(R.id.notApplicable); t.setText("It worked!"); Log.d(getClass().getSimpleName(), "invokeService()"); } } class RemoteCallsLoggingServiceConnection implements ServiceConnection { public void onServiceConnected(ComponentName className, IBinder boundService) { callsLoggingService = IMyRemoteCallsLoggingService.Stub .asInterface((IBinder) boundService); Log.d(getClass().getSimpleName(), "onServiceConnected()"); } public void onServiceDisconnected(ComponentName className) { callsLoggingService = null; updateCallsServiceStatus(); Log.d(getClass().getSimpleName(), "onServiceDisconnected"); } }; </code></pre> <p>I get a <code>NullPointerException</code> right on <code>callsLoggingService.dumpCallsLog()</code> in the <code>invokeCallsService()</code> method, and I'm not sure what's the problem!</p> <p>Here's the code of the service:</p> <pre><code>public class CallsLoggingService extends Service { String date, duration, type; private Handler serviceHandler; private Task myTask = new Task(); @Override public IBinder onBind(Intent arg0) { Log.d(getClass().getSimpleName(), "onBind()"); return myRemoteCallsServiceStub; } private IMyRemoteCallsLoggingService.Stub myRemoteCallsServiceStub = new IMyRemoteCallsLoggingService.Stub() { public void dumpCallsLog() throws RemoteException { CallsLoggingService.this.dumpCallsLog(); } }; @Override public void onCreate() { super.onCreate(); Log.d(getClass().getSimpleName(), "onCreate()"); } @Override public void onDestroy() { super.onDestroy(); serviceHandler.removeCallbacks(myTask); serviceHandler = null; Log.d(getClass().getSimpleName(), "onDestroy()"); } @Override public void onStart(Intent intent, int startId) { super.onStart(intent, startId); serviceHandler = new Handler(); serviceHandler.postDelayed(myTask, 10L); Log.d(getClass().getSimpleName(), "onStart()"); } class Task implements Runnable { public void run() { try { myRemoteCallsServiceStub.dumpCallsLog(); } catch (RemoteException e) { e.printStackTrace(); } serviceHandler.postDelayed(this, 86400000L); Log.i(getClass().getSimpleName(), "Calling the dumpCallsLog"); } } private synchronized void dumpCallsLog() { ContentResolver cr = getContentResolver(); String columns[] = new String[] { CallLog.Calls.DATE, CallLog.Calls.DURATION, CallLog.Calls.TYPE }; Uri mContacts = CallLog.Calls.CONTENT_URI; Cursor c = cr.query(mContacts, columns, // Which columns to return null, // WHERE clause; which rows to return(all rows) null, // WHERE clause selection arguments (none) CallLog.Calls.DEFAULT_SORT_ORDER // Order-by clause // (ascending // by name) ); if (c.moveToFirst()) { do { // Get the field values date = c.getString(c.getColumnIndex(CallLog.Calls.DATE)); duration = c .getString(c.getColumnIndex(CallLog.Calls.DURATION)); type = c.getString(c.getColumnIndex(CallLog.Calls.TYPE)); } while (c.moveToNext()); } } </code></pre> <p>}</p> <p>Thanks a lot everybody for the help!</p>
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