[android] Add more @Keep rules for JNI used methods

Signed-off-by: Konstantin Pastbin <konstantin.pastbin@gmail.com>

3party/opening_hours/opening_hours.cpp

@@ -22,9 +22,16 @@
   THE SOFTWARE.
 */
 
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-copy"
+#endif  // __clang__
 #include "opening_hours.hpp"
 #include "rules_evaluation.hpp"
 #include "parse_opening_hours.hpp"
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif  // __clang__
 
 #include <algorithm>
 #include <cstdlib>

android/proguard-mwm.txt

@@ -1,38 +1,9 @@
-# obfuscate supportV7 menu subclasses. it fixes bug with some Samsung and other devices ROMS based on android 4.2.2.
+# Every JNI-called class and method should have a @Keep annotation to properly work and to avoid
-# more details here : https://code.google.com/p/android/issues/detail?id=78377
+# being manually added as -keep in this file, for details see
-# For some reason, this line disables optimizations and avoids crashes due to missing @Keep attributes.
+# https://developer.android.com/studio/build/shrink-code#keep-code
-# Looks like R8 keeps EVERYTHING except that unused support lib :)
-# TODO: Remove this line after properly marking all JNI-called classes and methods with @Keep.
-# Also remove everything else what is not needed.
--keep class !android.support.v7.internal.view.menu.**,** {*;}
 
-# Gson support
+# Don't obfuscate to keep logs readable
--keep class com.mapswithme.util.Gsonable
+-dontobfuscate
--keep class * implements com.mapswithme.util.Gsonable
 
--keepclassmembernames class * implements com.mapswithme.util.Gsonable {
+# TODO: ATM leads to a build failure with an ERROR:R8: java.lang.NullPointerException
-  !transient <fields>;
+-dontoptimize
-}
-
-# Enabling shrinking causes
-# Execution failed for task ':minifyFdroidReleaseWithR8'.
-# > com.android.tools.r8.CompilationFailedException: Compilation failed to complete
-# Optimizing leads to crashes like
-# No pending exception expected: java.lang.ClassNotFoundException: Didn't find class "com.mapswithme.util.HttpClient"
-# It requires to manually mark all methods and classes called from NDK.
--dontoptimize
-
--keepnames class * implements com.mapswithme.util.Gsonable {
-  !transient <fields>;
-}
-
--keepclassmembers class * implements com.mapswithme.util.Gsonable {
-  <init>(...);
-}
-
--dontwarn com.google.android.material.**
--keep class com.google.android.material.** { *; }
-
--dontwarn androidx.**
--keep class androidx.** { *; }
--keep interface androidx.** { *; }

android/src/com/mapswithme/maps/Framework.java

@@ -6,6 +6,7 @@ import androidx.annotation.IntDef;
 import androidx.annotation.MainThread;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.Keep;
 import androidx.annotation.Size;
 import com.mapswithme.maps.api.ParsedRoutingData;
 import com.mapswithme.maps.api.ParsedSearchRequest;
@@ -73,6 +74,7 @@ public class Framework
   }
 
   @SuppressWarnings("unused")
+  @Keep
   public interface RoutingListener
   {
     @MainThread
@@ -80,6 +82,7 @@ public class Framework
   }
 
   @SuppressWarnings("unused")
+  @Keep
   public interface RoutingProgressListener
   {
     @MainThread

android/src/com/mapswithme/maps/MwmActivity.java

@@ -18,6 +18,7 @@ import android.view.ViewTreeObserver;
 import android.view.WindowManager;
 
 import androidx.annotation.CallSuper;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.StyleRes;
@@ -221,6 +222,7 @@ public class MwmActivity extends BaseMwmFragmentActivity
     runTasks();
   }
 
+  @Keep
   @Override
   public void onRenderingInitializationFinished()
   {
@@ -1115,7 +1117,7 @@ public class MwmActivity extends BaseMwmFragmentActivity
   }
 
   // Called from JNI.
-  @Override
+  @Override @Keep
   public void onPlacePageActivated(@NonNull PlacePageData data)
   {
     if (data instanceof MapObject)
@@ -1138,7 +1140,7 @@ public class MwmActivity extends BaseMwmFragmentActivity
   }
 
   // Called from JNI.
-  @Override
+  @Override @Keep
   public void onPlacePageDeactivated(boolean switchFullScreenMode)
   {
     if (switchFullScreenMode)

android/src/com/mapswithme/maps/MwmApplication.java

@@ -6,6 +6,7 @@ import android.content.SharedPreferences;
 import android.os.Handler;
 import android.os.Message;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import com.mapswithme.maps.background.AppBackgroundTracker;
 import com.mapswithme.maps.background.NotificationChannelFactory;
@@ -246,8 +247,8 @@ public class MwmApplication extends Application implements AppBackgroundTracker.
     Counters.resetAppSessionCounters(context);
   }
 
-  // Called from jni
   @SuppressWarnings("unused")
+  @Keep
   void forwardToMainThread(final long taskPointer)
   {
     Message m = Message.obtain(mMainLoopHandler, () -> nativeProcessTask(taskPointer));

android/src/com/mapswithme/maps/api/ParsedRoutingData.java

@@ -1,10 +1,13 @@
 package com.mapswithme.maps.api;
 
+import androidx.annotation.Keep;
+
 import com.mapswithme.maps.Framework;
 
 /**
  * Represents Framework::ParsedRoutingData from core.
  */
+@Keep
 public class ParsedRoutingData
 {
   public final RoutePoint[] mPoints;

android/src/com/mapswithme/maps/api/ParsedSearchRequest.java

@@ -1,13 +1,14 @@
 package com.mapswithme.maps.api;
 
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 /**
  * Represents url_scheme::SearchRequest from core.
  */
-
+@Keep
 public final class ParsedSearchRequest
 {
     @NonNull

android/src/com/mapswithme/maps/api/ParsingResult.java

@@ -1,10 +1,12 @@
 package com.mapswithme.maps.api;
 
 import androidx.annotation.IntDef;
+import androidx.annotation.Keep;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 
+@Keep
 public class ParsingResult
 {
   @Retention(RetentionPolicy.SOURCE)

android/src/com/mapswithme/maps/api/RoutePoint.java

@@ -1,8 +1,11 @@
 package com.mapswithme.maps.api;
 
+import androidx.annotation.Keep;
+
 /**
  * Represents url_scheme::RoutePoint from core.
  */
+@Keep
 public class RoutePoint
 {
   public final double mLat;

android/src/com/mapswithme/maps/bookmarks/data/Bookmark.java

@@ -4,6 +4,7 @@ import android.annotation.SuppressLint;
 import android.os.Parcel;
 
 import androidx.annotation.IntRange;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -13,7 +14,7 @@ import com.mapswithme.maps.search.Popularity;
 import com.mapswithme.util.Constants;
 
 // TODO consider refactoring to remove hack with MapObject unmarshalling itself and Bookmark at the same time.
-@SuppressLint("ParcelCreator")
+@SuppressLint("ParcelCreator") @Keep
 public class Bookmark extends MapObject
 {
   private Icon mIcon;

android/src/com/mapswithme/maps/bookmarks/data/BookmarkCategory.java

@@ -1,17 +1,17 @@
 package com.mapswithme.maps.bookmarks.data;
 
-import android.content.Context;
-import android.content.res.Resources;
 import android.os.Parcel;
 import android.os.Parcelable;
 
 import androidx.annotation.DrawableRes;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.PluralsRes;
 import androidx.annotation.StringRes;
 
 import com.mapswithme.maps.R;
 
+@Keep
 public class BookmarkCategory implements Parcelable
 {
   private final long mId;

android/src/com/mapswithme/maps/bookmarks/data/BookmarkInfo.java

@@ -1,11 +1,13 @@
 package com.mapswithme.maps.bookmarks.data;
 
 import androidx.annotation.IntRange;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
 import com.mapswithme.maps.Framework;
 import com.mapswithme.util.GeoUtils;
 
+@Keep
 public class BookmarkInfo
 {
   private final long mCategoryId;

android/src/com/mapswithme/maps/bookmarks/data/BookmarkManager.java

@@ -7,6 +7,7 @@ import android.provider.OpenableColumns;
 
 import androidx.annotation.IntDef;
 import androidx.annotation.IntRange;
+import androidx.annotation.Keep;
 import androidx.annotation.MainThread;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -28,7 +29,7 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
-@MainThread
+@MainThread @Keep
 public enum BookmarkManager
 {
   INSTANCE;

android/src/com/mapswithme/maps/bookmarks/data/BookmarkSharingResult.java

@@ -1,11 +1,13 @@
 package com.mapswithme.maps.bookmarks.data;
 
 import androidx.annotation.IntDef;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 
+@Keep
 public class BookmarkSharingResult
 {
   @Retention(RetentionPolicy.SOURCE)

android/src/com/mapswithme/maps/bookmarks/data/DistanceAndAzimut.java

@@ -1,5 +1,8 @@
 package com.mapswithme.maps.bookmarks.data;
 
+import androidx.annotation.Keep;
+
+@Keep
 public class DistanceAndAzimut
 {
   private final String mDistance;

android/src/com/mapswithme/maps/bookmarks/data/ElevationInfo.java

@@ -3,8 +3,8 @@ package com.mapswithme.maps.bookmarks.data;
 import android.os.Parcel;
 import android.os.Parcelable;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 
 import com.mapswithme.maps.widget.placepage.PlacePageData;
 
@@ -13,6 +13,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
+@Keep
 public class ElevationInfo implements PlacePageData
 {
   private final long mId;
@@ -132,6 +133,7 @@ public class ElevationInfo implements PlacePageData
     dest.writeTypedList(mPoints);
   }
 
+  @Keep
   public static class Point implements Parcelable
   {
     private final double mDistance;

android/src/com/mapswithme/maps/bookmarks/data/FeatureId.java

@@ -4,8 +4,10 @@ import android.os.Parcel;
 import android.os.Parcelable;
 import android.text.TextUtils;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
+@Keep
 public class FeatureId implements Parcelable
 {
   public static final Creator<FeatureId> CREATOR = new Creator<FeatureId>()

android/src/com/mapswithme/maps/bookmarks/data/MapObject.java

@@ -4,6 +4,7 @@ import android.os.Parcel;
 import android.text.TextUtils;
 
 import androidx.annotation.IntDef;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -20,6 +21,7 @@ import java.util.List;
 
 // TODO(yunikkk): Refactor. Displayed information is different from edited information, and it's better to
 // separate them. Simple getters from jni place_page::Info and osm::EditableFeature should be enough.
+@Keep
 public class MapObject implements PopularityProvider, PlacePageData
 {
   // Order must correspond indexer/map_object.hpp

android/src/com/mapswithme/maps/bookmarks/data/ParcelablePointD.java

@@ -4,7 +4,10 @@ import android.graphics.Point;
 import android.os.Parcel;
 import android.os.Parcelable;
 
+import androidx.annotation.Keep;
+
 // TODO consider removal and usage of platform PointF
+@Keep
 public class ParcelablePointD implements Parcelable
 {
   public double x;

android/src/com/mapswithme/maps/bookmarks/data/SortedBlock.java

@@ -1,11 +1,13 @@
 package com.mapswithme.maps.bookmarks.data;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+@Keep
 public class SortedBlock
 {
   @NonNull

android/src/com/mapswithme/maps/downloader/ChunkTask.java

@@ -3,6 +3,8 @@ package com.mapswithme.maps.downloader;
 import android.os.AsyncTask;
 import android.util.Base64;
 
+import androidx.annotation.Keep;
+
 import com.mapswithme.util.Constants;
 import com.mapswithme.util.StringUtils;
 import com.mapswithme.util.Utils;
@@ -19,7 +21,7 @@ import java.util.Map;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 
-@SuppressWarnings("unused")
+@SuppressWarnings("unused") @Keep
 class ChunkTask extends AsyncTask<Void, byte[], Integer>
 {
   private static final String TAG = ChunkTask.class.getSimpleName();

android/src/com/mapswithme/maps/downloader/CountryItem.java

@@ -2,6 +2,7 @@ package com.mapswithme.maps.downloader;
 
 import android.text.TextUtils;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -9,6 +10,7 @@ import androidx.annotation.Nullable;
  * Class representing a single item in countries hierarchy.
  * Fields are filled by native code.
  */
+@Keep
 public final class CountryItem implements Comparable<CountryItem>
 {
   private static String sRootId;

android/src/com/mapswithme/maps/downloader/MapManager.java

@@ -5,6 +5,7 @@ import android.app.Application;
 import android.content.DialogInterface;
 import android.text.TextUtils;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.StringRes;
@@ -21,7 +22,7 @@ import java.util.List;
 @UiThread
 public final class MapManager
 {
-  @SuppressWarnings("unused")
+  @SuppressWarnings("unused") @Keep
   public static class StorageCallbackData
   {
     public final String countryId;
@@ -46,6 +47,7 @@ public final class MapManager
   }
 
   @SuppressWarnings("unused")
+  @Keep
   interface CurrentCountryChangedListener
   {
     void onCurrentCountryChanged(String countryId);

android/src/com/mapswithme/maps/downloader/UpdateInfo.java

@@ -1,8 +1,11 @@
 package com.mapswithme.maps.downloader;
 
+import androidx.annotation.Keep;
+
 /**
  * Info about data to be updated. Created by native code.
  */
+@Keep
 public final class UpdateInfo
 {
   public final int filesCount;

android/src/com/mapswithme/maps/editor/data/HoursMinutes.java

@@ -4,12 +4,14 @@ import android.os.Parcel;
 import android.os.Parcelable;
 
 import androidx.annotation.IntRange;
+import androidx.annotation.Keep;
 
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.GregorianCalendar;
 import java.util.Locale;
 
+@Keep
 public class HoursMinutes implements Parcelable
 {
   public final long hours;

android/src/com/mapswithme/maps/editor/data/LocalizedName.java

@@ -1,7 +1,9 @@
 package com.mapswithme.maps.editor.data;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
+@Keep
 public class LocalizedName
 {
   public int code;

android/src/com/mapswithme/maps/editor/data/LocalizedStreet.java

@@ -1,7 +1,9 @@
 package com.mapswithme.maps.editor.data;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
+@Keep
 public class LocalizedStreet
 {
   public final String defaultName;

android/src/com/mapswithme/maps/editor/data/NamesDataSource.java

@@ -1,5 +1,7 @@
 package com.mapswithme.maps.editor.data;
 
+import androidx.annotation.Keep;
+
 /**
  * Class which contains array of localized names with following priority:
  * 1. Names for Mwm languages;
@@ -7,6 +9,7 @@ package com.mapswithme.maps.editor.data;
  * 3. Other names;
  * and mandatoryNamesCount - count of names which should be always shown.
  */
+@Keep
 public class NamesDataSource
 {
   private final LocalizedName[] mNames;

android/src/com/mapswithme/maps/editor/data/Timespan.java

@@ -1,5 +1,8 @@
 package com.mapswithme.maps.editor.data;
 
+import androidx.annotation.Keep;
+
+@Keep
 public class Timespan
 {
   public final HoursMinutes start;

android/src/com/mapswithme/maps/editor/data/Timetable.java

@@ -1,8 +1,10 @@
 package com.mapswithme.maps.editor.data;
 
 import androidx.annotation.IntRange;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
+@Keep
 public class Timetable
 {
   public final Timespan workingTimespan;

android/src/com/mapswithme/maps/location/LocationState.java

@@ -1,5 +1,6 @@
 package com.mapswithme.maps.location;
 
+import androidx.annotation.Keep;
 import androidx.annotation.IntDef;
 import androidx.annotation.NonNull;
 
@@ -8,6 +9,7 @@ import java.lang.annotation.RetentionPolicy;
 
 public final class LocationState
 {
+  @Keep
   interface ModeChangeListener
   {
     @SuppressWarnings("unused")

android/src/com/mapswithme/maps/location/PlatformSocket.java

@@ -4,6 +4,7 @@ import android.annotation.SuppressLint;
 import android.net.SSLCertificateSocketFactory;
 import android.os.SystemClock;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import com.mapswithme.maps.BuildConfig;
@@ -28,6 +29,7 @@ import java.net.SocketTimeoutException;
  * <p>
  * <b>All public methods are blocking and shouldn't be called from the main thread.</b>
  */
+@Keep
 class PlatformSocket
 {
   private static final String TAG = PlatformSocket.class.getSimpleName();

android/src/com/mapswithme/maps/maplayer/traffic/TrafficState.java

@@ -1,5 +1,6 @@
 package com.mapswithme.maps.maplayer.traffic;
 
+import androidx.annotation.Keep;
 import androidx.annotation.MainThread;
 import androidx.annotation.NonNull;
 
@@ -90,7 +91,7 @@ enum TrafficState
   interface StateChangeListener
   {
     // This method is called from JNI layer.
-    @SuppressWarnings("unused")
+    @SuppressWarnings("unused") @Keep
     @MainThread
     void onTrafficStateChanged(int state);
   }

android/src/com/mapswithme/maps/routing/RouteMarkData.java

@@ -1,10 +1,12 @@
 package com.mapswithme.maps.routing;
 
+import androidx.annotation.Keep;
 import androidx.annotation.Nullable;
 
 /**
  * Represents RouteMarkData from core.
  */
+@Keep
 public class RouteMarkData
 {
   @Nullable

android/src/com/mapswithme/maps/routing/RoutePointInfo.java

@@ -4,10 +4,12 @@ import android.os.Parcel;
 import android.os.Parcelable;
 
 import androidx.annotation.IntDef;
+import androidx.annotation.Keep;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 
+@Keep
 public class RoutePointInfo implements Parcelable
 {
   public static final Creator<RoutePointInfo> CREATOR = new Creator<RoutePointInfo>()

android/src/com/mapswithme/maps/routing/RoutingInfo.java

@@ -3,10 +3,12 @@ package com.mapswithme.maps.routing;
 import android.widget.ImageView;
 
 import androidx.annotation.DrawableRes;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
 import com.mapswithme.maps.R;
 
+@Keep
 public class RoutingInfo
 {
   // Target (end point of route).

android/src/com/mapswithme/maps/routing/SingleLaneInfo.java

@@ -1,5 +1,8 @@
 package com.mapswithme.maps.routing;
 
+import androidx.annotation.Keep;
+
+@Keep
 public class SingleLaneInfo
 {
   byte[] mLane;

android/src/com/mapswithme/maps/routing/TransitRouteInfo.java

@@ -1,5 +1,6 @@
 package com.mapswithme.maps.routing;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
 import java.util.ArrayList;
@@ -9,6 +10,7 @@ import java.util.List;
 /**
  * Represents TransitRouteInfo from core.
  */
+@Keep
 public class TransitRouteInfo
 {
   @NonNull

android/src/com/mapswithme/maps/routing/TransitStepInfo.java

@@ -1,6 +1,7 @@
 package com.mapswithme.maps.routing;
 
 import androidx.annotation.IntDef;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -10,6 +11,7 @@ import java.lang.annotation.RetentionPolicy;
 /**
  * Represents TransitStepInfo from core.
  */
+@Keep
 public class TransitStepInfo
 {
   private static final int TRANSIT_TYPE_INTERMEDIATE_POINT = 0;

android/src/com/mapswithme/maps/search/NativeMapSearchListener.java

@@ -1,7 +1,10 @@
 package com.mapswithme.maps.search;
 
+import androidx.annotation.Keep;
+
 public interface NativeMapSearchListener
 {
+  @Keep
   class Result
   {
     public final String countryId;

android/src/com/mapswithme/maps/search/Popularity.java

@@ -3,8 +3,10 @@ package com.mapswithme.maps.search;
 import android.os.Parcel;
 import android.os.Parcelable;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
+@Keep
 public class Popularity implements Parcelable
 {
   @NonNull

android/src/com/mapswithme/maps/search/SearchEngine.java

@@ -2,6 +2,7 @@ package com.mapswithme.maps.search;
 
 import android.content.Context;
 
+import androidx.annotation.Keep;
 import androidx.annotation.MainThread;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -26,6 +27,7 @@ public enum SearchEngine implements NativeSearchListener,
   private String mQuery;
 
   @Override
+  @Keep
   public void onResultsUpdate(@NonNull final SearchResult[] results, final long timestamp)
   {
     UiThread.run(
@@ -38,6 +40,7 @@ public enum SearchEngine implements NativeSearchListener,
   }
 
   @Override
+  @Keep
   public void onResultsEnd(final long timestamp)
   {
     UiThread.run(
@@ -50,6 +53,7 @@ public enum SearchEngine implements NativeSearchListener,
   }
 
   @Override
+  @Keep
   public void onMapSearchResults(final NativeMapSearchListener.Result[] results, final long timestamp, final boolean isLast)
   {
     UiThread.run(
@@ -61,6 +65,7 @@ public enum SearchEngine implements NativeSearchListener,
         });
   }
 
+  @Keep
   public void onBookmarkSearchResultsUpdate(@Nullable long[] bookmarkIds, long timestamp)
   {
     for (NativeBookmarkSearchListener listener : mBookmarkListeners)
@@ -68,6 +73,7 @@ public enum SearchEngine implements NativeSearchListener,
     mBookmarkListeners.finishIterate();
   }
 
+  @Keep
   public void onBookmarkSearchResultsEnd(@Nullable long[] bookmarkIds, long timestamp)
   {
     for (NativeBookmarkSearchListener listener : mBookmarkListeners)

android/src/com/mapswithme/maps/search/SearchFragment.java

@@ -11,10 +11,10 @@ import android.view.View;
 import android.view.ViewGroup;
 
 import androidx.annotation.CallSuper;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.widget.Toolbar;
-import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 import androidx.recyclerview.widget.LinearLayoutManager;
@@ -22,7 +22,6 @@ import androidx.recyclerview.widget.RecyclerView;
 import androidx.viewpager.widget.ViewPager;
 
 import com.google.android.material.appbar.AppBarLayout;
-import com.google.android.material.behavior.HideBottomViewOnScrollBehavior;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.google.android.material.tabs.TabLayout;
 import com.mapswithme.maps.Framework;
@@ -492,7 +491,7 @@ public class SearchFragment extends BaseMwmFragment
   }
 
   // Called from JNI.
-  @SuppressWarnings("unused")
+  @SuppressWarnings("unused") @Keep
   @Override
   public void onResultsUpdate(@NonNull SearchResult[] results, long timestamp)
   {

android/src/com/mapswithme/maps/search/SearchResult.java

@@ -1,5 +1,6 @@
 package com.mapswithme.maps.search;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
 import com.mapswithme.maps.bookmarks.data.FeatureId;
@@ -7,7 +8,7 @@ import com.mapswithme.maps.bookmarks.data.FeatureId;
 /**
  * Class instances are created from native code.
  */
-@SuppressWarnings("unused")
+@SuppressWarnings("unused") @Keep
 public class SearchResult implements PopularityProvider
 {
   public static final int TYPE_SUGGEST = 0;
@@ -20,7 +21,7 @@ public class SearchResult implements PopularityProvider
 
   public static final SearchResult EMPTY = new SearchResult("", "", 0, 0,
                                                             new int[] {});
-
+  @Keep
   public static class Description
   {
     public final FeatureId featureId;

android/src/com/mapswithme/util/BatteryState.java

@@ -7,6 +7,7 @@ import android.os.BatteryManager;
 
 import androidx.annotation.IntDef;
 import androidx.annotation.IntRange;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
 import com.mapswithme.maps.MwmApplication;
@@ -14,6 +15,7 @@ import com.mapswithme.maps.MwmApplication;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 
+@Keep
 public final class BatteryState
 {
   public static final byte CHARGING_STATUS_UNKNOWN = 0;

android/src/com/mapswithme/util/ConnectionState.java

@@ -7,6 +7,7 @@ import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
 import android.telephony.TelephonyManager;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -143,6 +144,7 @@ public enum ConnectionState implements Initializable<Context>
 
   // Called from JNI.
   @SuppressWarnings("unused")
+  @Keep
   public static byte getConnectionState()
   {
     return INSTANCE.requestCurrentType().getNativeRepresentation();

android/src/com/mapswithme/util/Gsonable.java

@@ -1,7 +0,0 @@
-package com.mapswithme.util;
-
-/**
- * Marker for classes that are (de)serializable from/to JSON using Google Gson library.
- */
-public interface Gsonable
-{}

android/src/com/mapswithme/util/HttpBackgroundUploader.java

@@ -1,5 +1,6 @@
 package com.mapswithme.util;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.work.Constraints;
 import androidx.work.Data;
@@ -9,6 +10,7 @@ import androidx.work.WorkManager;
 import com.google.gson.Gson;
 import com.mapswithme.util.log.Logger;
 
+@Keep
 public class HttpBackgroundUploader extends AbstractHttpUploader
 {
   private static final String TAG = HttpBackgroundUploader.class.getSimpleName();

android/src/com/mapswithme/util/HttpClient.java

@@ -26,6 +26,7 @@ package com.mapswithme.util;
 
 import android.text.TextUtils;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import com.mapswithme.util.log.Logger;
 
@@ -47,6 +48,7 @@ import java.util.Map;
 import java.util.zip.GZIPInputStream;
 import java.util.zip.InflaterInputStream;
 
+@Keep
 public final class HttpClient
 {
   private static final String TAG = HttpClient.class.getSimpleName();
@@ -224,6 +226,7 @@ public final class HttpClient
     return in;
   }
 
+  @Keep
   private static class Params
   {
     public void setHeaders(@NonNull KeyValue[] array)

android/src/com/mapswithme/util/HttpPayload.java

@@ -1,5 +1,6 @@
 package com.mapswithme.util;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
 import com.google.gson.annotations.SerializedName;
@@ -8,6 +9,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+@Keep
 public class HttpPayload
 {
   @NonNull

android/src/com/mapswithme/util/HttpUploader.java

@@ -4,6 +4,7 @@ import android.os.Build;
 import android.text.TextUtils;
 import android.util.Base64;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import com.mapswithme.util.log.Logger;
@@ -24,6 +25,7 @@ import java.net.URL;
 import java.net.URLConnection;
 import java.util.List;
 
+@Keep
 public final class HttpUploader extends AbstractHttpUploader
 {
   private static final String TAG = HttpUploader.class.getSimpleName();
@@ -234,6 +236,7 @@ public final class HttpUploader extends AbstractHttpUploader
     writer.flush();
   }
 
+  @Keep
   static class Result
   {
     private final int mHttpCode;

android/src/com/mapswithme/util/KeyValue.java

@@ -1,11 +1,13 @@
 package com.mapswithme.util;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
 import com.google.gson.annotations.SerializedName;
 
 import java.io.Serializable;
 
+@Keep
 public final class KeyValue implements Serializable
 {
   private static final long serialVersionUID = -3079360274128509979L;

android/src/com/mapswithme/util/Language.java

@@ -5,10 +5,12 @@ import android.text.TextUtils;
 import android.view.inputmethod.InputMethodManager;
 import android.view.inputmethod.InputMethodSubtype;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 
 import java.util.Locale;
 
+@Keep
 public class Language
 {
   // Locale.getLanguage() returns even 3-letter codes, not that we need in the C++ core,

android/src/com/mapswithme/util/NetworkPolicy.java

@@ -1,5 +1,6 @@
 package com.mapswithme.util;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.fragment.app.FragmentManager;
 
@@ -7,6 +8,7 @@ import com.mapswithme.maps.widget.StackedButtonDialogFragment;
 
 import java.util.concurrent.TimeUnit;
 
+@Keep
 public final class NetworkPolicy
 {
   public enum Type

android/src/com/mapswithme/util/SecureStorage.java

@@ -3,10 +3,12 @@ package com.mapswithme.util;
 import android.content.Context;
 import android.content.SharedPreferences;
 
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import com.mapswithme.util.log.Logger;
 
+@Keep
 public final class SecureStorage
 {
   private static final String TAG = SecureStorage.class.getSimpleName();

android/src/com/mapswithme/util/Utils.java

@@ -24,6 +24,7 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import androidx.annotation.DimenRes;
+import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.StringRes;
@@ -53,6 +54,7 @@ import java.util.Locale;
 import java.util.Map;
 import java.util.TimeZone;
 
+@Keep
 public class Utils
 {
   private static final String TAG = Utils.class.getSimpleName();