Using android beacon library 2.16.3 I am getting an error where my application crashes on startup.
The sections that seem to use this library and are crashing are here. Both sections are found in the MainMenu class.
Section 1
beaconManager = BeaconManager.getInstanceForApplication(this);
beaconManager.getBeaconParsers().add(new BeaconParser().
setBeaconLayout("s:0-1=feaa,m:2-2=00,p:3-3:-41,i:4-13,i:14-19"));
beaconManager.bind(this);
and also
Section 2
@Override
public void onBeaconServiceConnect() {
final Region region = new Region("DanielBeaconNew",null, null, null);
beaconManager.addMonitorNotifier(new MonitorNotifier() {
@Override
public void didEnterRegion(Region region) {
try {
beaconManager.startRangingBeaconsInRegion(region);
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
public void didExitRegion(Region region) {
try {
beaconManager.stopRangingBeaconsInRegion(region);
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
public void didDetermineStateForRegion(int state, Region region) {
System.out.println( "I have just switched from seeing/not seeing beacons: "+state);
}
});
beaconManager.addRangeNotifier(new RangeNotifier() {
@Override
public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
for (Beacon b: beacons ) {
mTextMessage.append(b.getBluetoothAddress() + " \n");
}
}
});
try {
beaconManager.startMonitoringBeaconsInRegion(region);
} catch (RemoteException e) { }
}
with the initial bind and the final try catch block being the source of the aparent error.
Stacktrace:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: sc17dpc.individualproject, PID: 16111
java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/localbroadcastmanager/content/LocalBroadcastManager;
at org.altbeacon.beacon.BeaconLocalBroadcastProcessor.unregister(BeaconLocalBroadcastProcessor.java:80)
at org.altbeacon.beacon.BeaconLocalBroadcastProcessor.register(BeaconLocalBroadcastProcessor.java:72)
at org.altbeacon.beacon.service.ScanJobScheduler.ensureNotificationProcessorSetup(ScanJobScheduler.java:70)
at org.altbeacon.beacon.service.ScanJobScheduler.schedule(ScanJobScheduler.java:130)
at org.altbeacon.beacon.service.ScanJobScheduler.applySettingsToScheduledJob(ScanJobScheduler.java:85)
at org.altbeacon.beacon.service.ScanJobScheduler.applySettingsToScheduledJob(ScanJobScheduler.java:92)
at org.altbeacon.beacon.BeaconManager.applyChangesToServices(BeaconManager.java:1003)
at org.altbeacon.beacon.BeaconManager.startMonitoringBeaconsInRegion(BeaconManager.java:938)
at sc17dpc.individualproject.MainMenu.onBeaconServiceConnect(MainMenu.java:202)
at org.altbeacon.beacon.BeaconManager.bind(BeaconManager.java:420)
at sc17dpc.individualproject.MainMenu.onCreate(MainMenu.java:76)
at android.app.Activity.performCreate(Activity.java:7458)
at android.app.Activity.performCreate(Activity.java:7448)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1286)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3409)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3614)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:86)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2199)
at android.os.Handler.dispatchMessage(Handler.java:112)
at android.os.Looper.loop(Looper.java:216)
at android.app.ActivityThread.main(ActivityThread.java:7625)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)
Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.localbroadcastmanager.content.LocalBroadcastManager" on path: DexPathList[[zip file "/data/app/sc17dpc.individualproject-n6zKYGRXGKs9Lt6RAM16sw==/base.apk"],nativeLibraryDirectories=[/data/app/sc17dpc.individualproject-n6zKYGRXGKs9Lt6RAM16sw==/lib/arm64, /system/lib64, /product/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at org.altbeacon.beacon.BeaconLocalBroadcastProcessor.unregister(BeaconLocalBroadcastProcessor.java:80)
at org.altbeacon.beacon.BeaconLocalBroadcastProcessor.register(BeaconLocalBroadcastProcessor.java:72)
at org.altbeacon.beacon.service.ScanJobScheduler.ensureNotificationProcessorSetup(ScanJobScheduler.java:70)
at org.altbeacon.beacon.service.ScanJobScheduler.schedule(ScanJobScheduler.java:130)
at org.altbeacon.beacon.service.ScanJobScheduler.applySettingsToScheduledJob(ScanJobScheduler.java:85)
at org.altbeacon.beacon.service.ScanJobScheduler.applySettingsToScheduledJob(ScanJobScheduler.java:92)
at org.altbeacon.beacon.BeaconManager.applyChangesToServices(BeaconManager.java:1003)
at org.altbeacon.beacon.BeaconManager.startMonitoringBeaconsInRegion(BeaconManager.java:938)
at sc17dpc.individualproject.MainMenu.onBeaconServiceConnect(MainMenu.java:202)
at org.altbeacon.beacon.BeaconManager.bind(BeaconManager.java:420)
at sc17dpc.individualproject.MainMenu.onCreate(MainMenu.java:76)
at android.app.Activity.performCreate(Activity.java:7458)
at android.app.Activity.performCreate(Activity.java:7448)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1286)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3409)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3614)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:86)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2199)
at android.os.Handler.dispatchMessage(Handler.java:112)
at android.os.Looper.loop(Looper.java:216)
at android.app.ActivityThread.main(ActivityThread.java:7625)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)
The issue with the code does not seem to lay with any other sections of the code since the application seems to work fine when I comment out the last try catch block.
I have inserted section 1 and 2 since they are the only sections that are referenced in the error logs for the application.
Section 1 contains line 76 and section 2 contains line 202 (the startMonitoringBeaconsInRegion call).
Since your error is:
Caused by: java.lang.ClassNotFoundException:
Didn't find class "androidx.localbroadcastmanager.content.LocalBroadcastManager"
You may need to add the dependency so you can use the LocalBroadCastManager from AndroidX to your build.gradle dependencies:
implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.0.0'