diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java
index 034410a0..204933f5 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java
@@ -7,7 +7,6 @@ import android.os.Build;
 import android.os.Build.VERSION;
 import android.preference.PreferenceManager;
 import android.util.Log;
-import android.widget.Toast;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -27,7 +26,7 @@ public class GBApplication extends Application {
     private static final String TAG = "GBApplication";
     private static GBApplication context;
     private static ActivityDatabaseHandler mActivityDatabaseHandler;
-    private static Lock dbLock = new ReentrantLock();
+    private static final Lock dbLock = new ReentrantLock();
 
     public GBApplication() {
         context = this;
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/ControlCenter.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/ControlCenter.java
index 17ced04c..56fa1215 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/ControlCenter.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/ControlCenter.java
@@ -50,14 +50,14 @@ public class ControlCenter extends Activity {
     public static final String ACTION_REFRESH_DEVICELIST
             = "nodomain.freeyourgadget.gadgetbridge.controlcenter.action.set_version";
 
-    TextView hintTextView;
-    ListView deviceListView;
-    GBDeviceAdapter mGBDeviceAdapter;
+    private TextView hintTextView;
+    private ListView deviceListView;
+    private GBDeviceAdapter mGBDeviceAdapter;
     private GBDevice selectedDevice = null;
 
-    final List<GBDevice> deviceList = new ArrayList<>();
+    private final List<GBDevice> deviceList = new ArrayList<>();
 
-    private BroadcastReceiver mReceiver = new BroadcastReceiver() {
+    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             String action = intent.getAction();
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/ChartsActivity.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/ChartsActivity.java
index 301c1012..dd63fb8c 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/ChartsActivity.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/ChartsActivity.java
@@ -132,7 +132,7 @@ public class ChartsActivity extends FragmentActivity {
      * A {@link FragmentStatePagerAdapter} that returns a fragment corresponding to
      * one of the sections/tabs/pages.
      */
-    public class SectionsPagerAdapter extends FragmentStatePagerAdapter {
+    public static class SectionsPagerAdapter extends FragmentStatePagerAdapter {
 
         public SectionsPagerAdapter(FragmentManager fm) {
             super(fm);
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/database/ActivityDatabaseHandler.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/database/ActivityDatabaseHandler.java
index 3948acd4..f80fee19 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/database/ActivityDatabaseHandler.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/database/ActivityDatabaseHandler.java
@@ -169,18 +169,18 @@ public class ActivityDatabaseHandler extends SQLiteOpenHelper implements DBHandl
         final String where = "(provider=" + provider.getID() + " and timestamp>=" + timestamp_from + " and timestamp<=" + timestamp_to + getWhereClauseFor(activityTypes, provider) + ")";
         final String order = "timestamp";
         try (SQLiteDatabase db = this.getReadableDatabase()) {
-            Cursor cursor = db.query(TABLE_GBACTIVITYSAMPLES, null, where, null, null, null, order);
-
-            if (cursor.moveToFirst()) {
-                do {
-                    GBActivitySample sample = new GBActivitySample(
-                            provider,
-                            cursor.getInt(cursor.getColumnIndex(KEY_TIMESTAMP)),
-                            cursor.getShort(cursor.getColumnIndex(KEY_INTENSITY)),
-                            cursor.getShort(cursor.getColumnIndex(KEY_STEPS)),
-                            (byte) cursor.getShort(cursor.getColumnIndex(KEY_TYPE)));
-                    samples.add(sample);
-                } while (cursor.moveToNext());
+            try (Cursor cursor = db.query(TABLE_GBACTIVITYSAMPLES, null, where, null, null, null, order)) {
+                if (cursor.moveToFirst()) {
+                    do {
+                        GBActivitySample sample = new GBActivitySample(
+                                provider,
+                                cursor.getInt(cursor.getColumnIndex(KEY_TIMESTAMP)),
+                                cursor.getShort(cursor.getColumnIndex(KEY_INTENSITY)),
+                                cursor.getShort(cursor.getColumnIndex(KEY_STEPS)),
+                                (byte) cursor.getShort(cursor.getColumnIndex(KEY_TYPE)));
+                        samples.add(sample);
+                    } while (cursor.moveToNext());
+                }
             }
         }
 
diff --git a/app/src/main/res/layout/activity_alarm_details.xml b/app/src/main/res/layout/activity_alarm_details.xml
index 3a4d36d0..b50f7193 100644
--- a/app/src/main/res/layout/activity_alarm_details.xml
+++ b/app/src/main/res/layout/activity_alarm_details.xml
@@ -17,8 +17,6 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:id="@+id/alarm_time_picker"
-            android:layout_alignParentTop="true"
-            android:layout_alignParentStart="true"
             android:timePickerMode="clock"
             android:layout_weight="1" />