I saw:
http://developer.android.com/reference/android/telephony/CellInfo.html
and thought that having the signal strength tower ID and in use and
neighboring
towers all in one callback would be nice to have. I wrote a test program
to see
if I could get this CellInfoGsm on a Galaxy Nexus or Nexus 4. Snippet of
test
code follows:
@Override
public void onCreate() {
// Notification to not get killed
Log.d("CellInfoTest","Service onCreate");
mNotification = buildNotification();
startForeground(5,mNotification);
((NotificationManager)getSystemService(NOTIFICATION_SERVICE)).notify(5,mNotification);
mListener = new PhoneStateListener() {
public void onCellInfoChanged(List<CellInfo> c) {
Log.d("CellInfoTest","onCellInfoChanged
called");
dumpCellInfoList(c);
}
public void onCellLocationChanged(CellLocation c) {
Log.d("CellInfoTest","onCellLocationChanged
called");
dumpCellLocation(c);
}
};
myTm =
(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
}
private void dumpCellInfoList(List<CellInfo> c) {
try {
for (int i = 0; i < c.size(); i++) {
Log.d("CellInfoTest","dumpInfoLocation:"+c.get(i).toString());
}
} catch (java.lang.NullPointerException e) {
Log.d("CellInfoTest","Null pointer for CellInfo");
}
}
private void dumpCellLocation(CellLocation c) {
try {
Log.d("CellInfoTest","dumpCellLocation:"+c.toString());
} catch (java.lang.NullPointerException e) {
Log.d("CellInfoTest","Null pointer for
CellLocation");
}
}
@Override
public int onStartCommand(Intent i, int flags, int startid){
Log.d("CellInfoTest","Service onStartCommand");
myTm.listen(mListener,
PhoneStateListener.LISTEN_CELL_INFO +
PhoneStateListener.LISTEN_CELL_LOCATION);
return START_STICKY;
}
I've also included
<uses-sdk android:minSdkVersion="17" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
in the manifest to be sure I was on an updated phone that supported the API
and could see
the cell location information. I gathered the adb logcat output and
toggled the airplane mode
a few times to see what got called back. I'm seeing:
01-25 19:04:31.516 D/CellInfoTest( 7999): Starting service
01-25 19:04:31.526 D/CellInfoTest( 7999): Service onCreate
01-25 19:04:31.526 D/CellInfoTest( 7999): Service onStartCommand
01-25 19:04:31.536 D/CellInfoTest( 7999): onCellLocationChanged called
01-25 19:04:31.536 D/CellInfoTest( 7999):
dumpCellLocation:[10989,194036662,418]
01-25 19:04:31.536 D/CellInfoTest( 7999): onCellInfoChanged called
01-25 19:04:31.536 D/CellInfoTest( 7999): Null pointer for CellInfo
01-25 19:04:58.935 D/CellInfoTest( 7999): onCellLocationChanged called
01-25 19:04:58.935 D/CellInfoTest( 7999): dumpCellLocation:[10989,-1,418]
01-25 19:04:59.826 D/CellInfoTest( 7999): onCellLocationChanged called
01-25 19:04:59.826 D/CellInfoTest( 7999): dumpCellLocation:[-1,-1,-1]
01-25 19:04:59.956 D/CellInfoTest( 7999): onCellLocationChanged called
01-25 19:04:59.966 D/CellInfoTest( 7999): dumpCellLocation:[-1,-1,0]
01-25 19:05:00.857 D/CellInfoTest( 7999): onCellLocationChanged called
01-25 19:05:00.857 D/CellInfoTest( 7999):
dumpCellLocation:[10989,194036662,418]
which looks like as soon as I register I get a callback, but the CellInfo
is null (which
I think is very odd, as it should at least contain the location/strength of
the cell that
is currently connected and dumped by dumpCellLocation) each of the
callbacks that
follow happen with the airplane mode toggle an only for
onCellLocationChanged.
My questions are:
Is there a flaw in my code that I am missing?
Is there a permission that I need to get the onCellInfoChanged callback to
happen?
If my code looks good, who do I look to to ask why the Galaxy Nexus and
Nexus 4
both fail to make the callbacks (is there a CTS case update that needs to
happen,
or should I file a bug against the android code?)
Dan S.
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