diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/FindPhoneActivity.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/FindPhoneActivity.java
index aa62c74a4..9dcf639c2 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/FindPhoneActivity.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/FindPhoneActivity.java
@@ -25,7 +25,6 @@ import android.media.MediaPlayer;
 import android.media.RingtoneManager;
 import android.net.Uri;
 import android.os.Bundle;
-import android.support.v4.app.RemoteInput;
 import android.support.v4.content.LocalBroadcastManager;
 import android.view.View;
 import android.widget.Button;
@@ -36,8 +35,6 @@ import org.slf4j.LoggerFactory;
 import java.io.IOException;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
-import nodomain.freeyourgadget.gadgetbridge.model.DeviceService;
-import nodomain.freeyourgadget.gadgetbridge.util.GB;
 
 
 public class FindPhoneActivity extends AbstractGBActivity {
@@ -100,9 +97,13 @@ public class FindPhoneActivity extends AbstractGBActivity {
             mp.prepare();
             mp.start();
         } catch (IOException ignore) {
+            LOG.warn("problem playing ringtone");
         }
-        mAudioManager.setStreamVolume(AudioManager.STREAM_ALARM, mAudioManager.getStreamMaxVolume(AudioManager.STREAM_ALARM), AudioManager.FLAG_PLAY_SOUND);
 
+        if (mAudioManager != null) {
+            userVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_ALARM);
+            mAudioManager.setStreamVolume(AudioManager.STREAM_ALARM, mAudioManager.getStreamMaxVolume(AudioManager.STREAM_ALARM), AudioManager.FLAG_PLAY_SOUND);
+        }
     }
 
     public void stopSound() {
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/WeekSleepChartFragment.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/WeekSleepChartFragment.java
index fffa5fbf8..b22f8b740 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/WeekSleepChartFragment.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/WeekSleepChartFragment.java
@@ -74,7 +74,7 @@ public class WeekSleepChartFragment extends AbstractWeekChartFragment {
     @Override
     protected String getBalanceMessage(long balance, int targetValue) {
         if (balance > 0) {
-            final long totalBalance = balance - (targetValue * TOTAL_DAYS);
+            final long totalBalance = balance - ((long)targetValue * TOTAL_DAYS);
             if (totalBalance > 0)
                 return getString(R.string.overslept, getHM(totalBalance));
             else
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/WeekStepsChartFragment.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/WeekStepsChartFragment.java
index e70490a0a..3968d1145 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/WeekStepsChartFragment.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/WeekStepsChartFragment.java
@@ -105,7 +105,7 @@ public class WeekStepsChartFragment extends AbstractWeekChartFragment {
     @Override
     protected String getBalanceMessage(long balance, int targetValue) {
         if (balance > 0) {
-            final long totalBalance = balance - (targetValue * TOTAL_DAYS);
+            final long totalBalance = balance - ((long)targetValue * TOTAL_DAYS);
             if (totalBalance > 0)
                 return getString(R.string.overstep, Math.abs(totalBalance));
             else
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/externalevents/NotificationListener.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/externalevents/NotificationListener.java
index ad2004d1a..aa7ab1bb0 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/externalevents/NotificationListener.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/externalevents/NotificationListener.java
@@ -239,7 +239,7 @@ public class NotificationListener extends NotificationListenerService {
         }
 
         // Ignore too frequent notifications, according to user preference
-        long min_timeout = prefs.getInt("notifications_timeout", 0) * 1000;
+        long min_timeout = (long)prefs.getInt("notifications_timeout", 0) * 1000L;
         long cur_time = System.currentTimeMillis();
         if (notificationBurstPrevention.containsKey(source)) {
             long last_time = notificationBurstPrevention.get(source);