Cleanup: add missing @NonNull annotation.

src/androidTest/java/de/dennisguse/opentracks/services/TrackRecordingServiceNotificationManagerTest.java

@@ -6,6 +6,7 @@ import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.content.Context;
 
+import androidx.annotation.NonNull;
 import androidx.core.app.NotificationCompat;
 import androidx.test.core.app.ApplicationProvider;
 
@@ -91,6 +92,7 @@ public class TrackRecordingServiceNotificationManagerTest {
             setSmallIcon(R.drawable.ic_logo_color_24dp);
         }
 
+        @NonNull
         @Override
         public NotificationCompat.Builder setOnlyAlertOnce(boolean onlyAlertOnce) {
             onlyAlertOnceValues.add(onlyAlertOnce);

src/androidTest/java/de/dennisguse/opentracks/util/ActivityTestUtils.java

@@ -6,6 +6,7 @@ import android.app.Activity;
 import android.app.Application;
 import android.os.Bundle;
 
+import androidx.annotation.NonNull;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.platform.app.InstrumentationRegistry;
 import androidx.test.runner.lifecycle.ActivityLifecycleMonitorRegistry;
@@ -33,7 +34,7 @@ public final class ActivityTestUtils {
 
         Application.ActivityLifecycleCallbacks callbacks = new Application.ActivityLifecycleCallbacks() {
             @Override
-            public void onActivityResumed(Activity activity) {
+            public void onActivityResumed(@NonNull Activity activity) {
                 if (activityClass.isInstance(activity)) {
                     resumedActivityRef.set(activityClass.cast(activity));
                     latch.countDown();
@@ -41,27 +42,27 @@ public final class ActivityTestUtils {
             }
 
             @Override
-            public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
+            public void onActivityCreated(@NonNull Activity activity, Bundle savedInstanceState) {
             }
 
             @Override
-            public void onActivityStarted(Activity activity) {
+            public void onActivityStarted(@NonNull Activity activity) {
             }
 
             @Override
-            public void onActivityPaused(Activity activity) {
+            public void onActivityPaused(@NonNull Activity activity) {
             }
 
             @Override
-            public void onActivityStopped(Activity activity) {
+            public void onActivityStopped(@NonNull Activity activity) {
             }
 
             @Override
-            public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
+            public void onActivitySaveInstanceState(@NonNull Activity activity, @NonNull Bundle outState) {
             }
 
             @Override
-            public void onActivityDestroyed(Activity activity) {
+            public void onActivityDestroyed(@NonNull Activity activity) {
             }
         };
 

src/main/java/de/dennisguse/opentracks/settings/bluetooth/BluetoothLeAdapter.java

@@ -96,6 +96,7 @@ public class BluetoothLeAdapter extends BaseAdapter {
             this.name = name;
         }
 
+        @NonNull
         public String getAddress() {
             return address;
         }