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[android] - Implements Android bindings for offline API
Fixes #3891

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#	[android] #3891 - rename OFFLINE_MAX_CACHE_SIZE to DEFAULT_MAX_CACHE_SIZE and adjust value

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#	[android] #3891 - makes de documentation more relevant to the current android implementation

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#	[android] #3891 - rename isRequiredResourceCountIsIndeterminate() to isRequiredResourceCountPrecise()

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#	[android] #3891 - rename complete() to isComplete()

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#	[android] #3891 - rename OfflineRegionDefinition to OfflineTilePyramidRegionDefinition and make OfflineRegionDefinition an interface. Docs for corresponding classes updated.

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#	[android] #3891 - make reason a more idiomatic ErrorReason Android IntDef and remove unnecessary constructor

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#	[android] #3891 - reuse the calling object instead of creating a new manager

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#	[android] #3891 - location, location, location

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#	[android] #3891 - simpler list regions iteration

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#	[android] #3891 - proper indeterminate -> precise transition

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#	[android] #3891 - improve description for DEFAULT_MAX_CACHE_SIZE

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#	[android] #3891 - delete global refs for obj and listCallback

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#	[android] #3891 - simplify metadata conversion and fix metadata object

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#	[android] - Implements Android bindings for offline API
#	Fixes #3891

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#	[android] #3891 - avoid exposing the int reason value in the public API

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#	[android] #3891 - delete global refs for remaining callbacks and observer

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#	[android] #3891 - remove unused offlineManagerClassConstructorId together with unnecessary private java constructor

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#	[android] #3891 - remove non-relevant line

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#	[android] #3891 - handle requiredResourceCountIsIndeterminate -> requiredResourceCountIsPrecise rename

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#	[android] #3891 - revert map changes to allow rebase

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#	[android] #3891 - avoid exposing the int reason value in the public API

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#	[android] #3891 - rename complete() to isComplete()

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#	[android] #3891 - rename OfflineRegionDefinition to OfflineTilePyramidRegionDefinition and make OfflineRegionDefinition an interface. Docs for corresponding classes updated.

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#	[android] #3891 - location, location, location

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#	[android] #3891 - improve description for DEFAULT_MAX_CACHE_SIZE

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#	[android] #3891 - delete global refs for obj and listCallback

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#	[android] #3891 - simplify metadata conversion and fix metadata object

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#	[android] #3891 - delete global refs for remaining callbacks and observer

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#	[android] #3891 - remove unused offlineManagerClassConstructorId together with unnecessary private java constructor

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#	[android] #3891 - remove non-relevant line

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#	[android] #3891 - handle requiredResourceCountIsIndeterminate -> requiredResourceCountIsPrecise rename

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diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java
new file mode 100644
index 0000000000..b56ecfc057
--- /dev/null
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java
@@ -0,0 +1,184 @@
+package com.mapbox.mapboxsdk.offline;
+
+import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+import android.support.annotation.NonNull;
+
+import java.io.File;
+
+/**
+ * The offline manager is the main entry point for offline-related functionality.
+ * It'll help you list and create offline regions.
+ */
+public class OfflineManager {
+
+    // Default database name
+    private final static String OFFLINE_DATABASE_NAME = "mbgl-offline.db";
+
+    /*
+     * The maximumCacheSize parameter is a limit applied to non-offline resources only,
+     * i.e. resources added to the database for the "ambient use" caching functionality.
+     * There is no size limit for offline resources.
+     */
+    private final static long DEFAULT_MAX_CACHE_SIZE = 50 * 1024 * 1024;
+
+    // Holds the pointer to JNI DefaultFileSource
+    private long mDefaultFileSourcePtr = 0;
+
+    // Makes sure callbacks come back to the main thread
+    private Handler handler;
+
+    // This object is implemented as a singleton
+    private static OfflineManager instance;
+
+    /*
+     * Callbacks
+     */
+
+    public interface ListOfflineRegionsCallback {
+        void onList(OfflineRegion[] offlineRegions);
+        void onError(String error);
+    }
+
+    public interface CreateOfflineRegionCallback {
+        void onCreate(OfflineRegion offlineRegion);
+        void onError(String error);
+    }
+
+    /*
+     * Constructors
+     */
+
+    private OfflineManager(Context context) {
+        // Get a pointer to the DefaultFileSource instance
+        String assetRoot = context.getFilesDir().getAbsolutePath();
+        String cachePath = assetRoot  + File.separator + OFFLINE_DATABASE_NAME;
+        mDefaultFileSourcePtr = createDefaultFileSource(cachePath, assetRoot, DEFAULT_MAX_CACHE_SIZE);
+    }
+
+    public static synchronized OfflineManager getInstance(Context context) {
+        if (instance == null) {
+            instance = new OfflineManager(context);
+        }
+
+        return instance;
+    }
+
+    /*
+     * Access token getter/setter
+     */
+    public void setAccessToken(String accessToken) {
+        setAccessToken(mDefaultFileSourcePtr, accessToken);
+    }
+
+    public String getAccessToken() {
+        return getAccessToken(mDefaultFileSourcePtr);
+    }
+
+    private Handler getHandler() {
+        if (handler == null) {
+            handler = new Handler(Looper.getMainLooper());
+        }
+
+        return handler;
+    }
+
+    /**
+     * Retrieve all regions in the offline database.
+     *
+     * The query will be executed asynchronously and the results passed to the given
+     * callback on the main thread.
+     */
+    public void listOfflineRegions(@NonNull final ListOfflineRegionsCallback callback) {
+        listOfflineRegions(mDefaultFileSourcePtr, new ListOfflineRegionsCallback() {
+            @Override
+            public void onList(final OfflineRegion[] offlineRegions) {
+                getHandler().post(new Runnable() {
+                    @Override
+                    public void run() {
+                        callback.onList(offlineRegions);
+                    }
+                });
+            }
+
+            @Override
+            public void onError(final String error) {
+                getHandler().post(new Runnable() {
+                    @Override
+                    public void run() {
+                        callback.onError(error);
+                    }
+                });
+            }
+        });
+    }
+
+    /**
+     * Create an offline region in the database.
+     *
+     * When the initial database queries have completed, the provided callback will be
+     * executed on the main thread.
+     *
+     * Note that the resulting region will be in an inactive download state; to begin
+     * downloading resources, call `OfflineRegion.setDownloadState(DownloadState.STATE_ACTIVE)`,
+     * optionally registering an `OfflineRegionObserver` beforehand.
+     */
+    public void createOfflineRegion(
+            @NonNull OfflineRegionDefinition definition,
+            @NonNull OfflineRegionMetadata metadata,
+            @NonNull final CreateOfflineRegionCallback callback) {
+
+        createOfflineRegion(mDefaultFileSourcePtr, definition, metadata, new CreateOfflineRegionCallback() {
+            @Override
+            public void onCreate(final OfflineRegion offlineRegion) {
+                getHandler().post(new Runnable() {
+                    @Override
+                    public void run() {
+                        callback.onCreate(offlineRegion);
+                    }
+                });
+            }
+
+            @Override
+            public void onError(final String error) {
+                getHandler().post(new Runnable() {
+                    @Override
+                    public void run() {
+                        callback.onError(error);
+                    }
+                });
+            }
+        });
+    }
+
+    /*
+    * Changing or bypassing this limit without permission from Mapbox is prohibited
+    * by the Mapbox Terms of Service.
+    */
+    public void setOfflineMapboxTileCountLimit(long limit) {
+        setOfflineMapboxTileCountLimit(mDefaultFileSourcePtr, limit);
+    }
+
+
+    /*
+     * Native methods
+     */
+
+    private native long createDefaultFileSource(
+            String cachePath, String assetRoot, long maximumCacheSize);
+
+    private native void setAccessToken(long defaultFileSourcePtr, String accessToken);
+    private native String getAccessToken(long defaultFileSourcePtr);
+
+    private native void listOfflineRegions(
+            long defaultFileSourcePtr, ListOfflineRegionsCallback callback);
+
+    private native void createOfflineRegion(
+            long defaultFileSourcePtr, OfflineRegionDefinition definition,
+            OfflineRegionMetadata metadata, CreateOfflineRegionCallback callback);
+
+    private native void setOfflineMapboxTileCountLimit(
+            long defaultFileSourcePtr, long limit);
+
+}