How to support custom tiled map format in Runtime v100 ?

PatrickBolduc

Hi,

We are trying to migrate one of our applicatoin from v10.2.9 to v100.1. We need to support map formats that are currently unsupported in the new runtime (i.e. : MBTiles). In our case, the system is always offline and the map are stored locally on the Android device.

It was easy to do that in the previous version (Creating a custom TileServiceLayer in ArcGIS Android | ArcGIS Blog ), but I had no success so for on the new v100.1.

I tried to extend the ImageTiledLayer, but I get an exception when I try to create a TileInfo using the following code :

<SPAN class="keyword token">public</SPAN> <SPAN class="keyword token">static</SPAN> ImageTiledLayer <SPAN class="token function">createMBTilesLayer</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">final</SPAN> Uri databaseUri<SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">final</SPAN> SQLiteDatabase database <SPAN class="operator token">=</SPAN> SQLiteDatabase<SPAN class="punctuation token">.</SPAN><SPAN class="token function">openDatabase</SPAN><SPAN class="punctuation token">(</SPAN>databaseUri<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getPath</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> null<SPAN class="punctuation token">,</SPAN> SQLiteDatabase<SPAN class="punctuation token">.</SPAN>OPEN_READONLY<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">ErrorHandler</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">final</SPAN> <SPAN class="keyword token">int</SPAN> maxLevel <SPAN class="operator token">=</SPAN> <SPAN class="token function">retrieveMaxLevel</SPAN><SPAN class="punctuation token">(</SPAN>database<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">final</SPAN> List<SPAN class="operator token"><</SPAN>LevelOfDetail<SPAN class="operator token">></SPAN> levelOfDetails <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">ArrayList</SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">></SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">int</SPAN> i <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN> i <SPAN class="operator token"><</SPAN> maxLevel<SPAN class="punctuation token">;</SPAN> i<SPAN class="operator token">++</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; levelOfDetails<SPAN class="punctuation token">.</SPAN><SPAN class="token function">add</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">LevelOfDetail</SPAN><SPAN class="punctuation token">(</SPAN>i<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">156543.032</SPAN> <SPAN class="operator token">/</SPAN> Math<SPAN class="punctuation token">.</SPAN><SPAN class="token function">pow</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN> i<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">554678932</SPAN> <SPAN class="operator token">/</SPAN> Math<SPAN class="punctuation token">.</SPAN><SPAN class="token function">pow</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN> i<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">final</SPAN> TileInfo tileInfo <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">TileInfo</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">96</SPAN><SPAN class="punctuation token">,</SPAN> TileInfo<SPAN class="punctuation token">.</SPAN>ImageFormat<SPAN class="punctuation token">.</SPAN>JPG<SPAN class="punctuation token">,</SPAN> levelOfDetails<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Point</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> SpatialReferences<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getWebMercator</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">256</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">256</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">MBTilesLayer</SPAN><SPAN class="punctuation token">(</SPAN>tileInfo<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Envelope</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="operator token">-</SPAN><SPAN class="number token">180.0</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="operator token">-</SPAN><SPAN class="number token">85.0</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">180</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">85</SPAN><SPAN class="punctuation token">,</SPAN> SpatialReferences<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getWebMercator</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> database<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN>
<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

java.lang.RuntimeException: Unable to start activity ComponentInfo{}: com.esri.arcgisruntime.ArcGISRuntimeException: Invalid argument
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2456)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2539)
at android.app.ActivityThread.access$900(ActivityThread.java:159)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1384)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5507)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Caused by: com.esri.arcgisruntime.ArcGISRuntimeException: Invalid argument
at com.esri.arcgisruntime.internal.jni.CoreTileInfo.nativeCreateWith(Native Method)
at com.esri.arcgisruntime.internal.jni.CoreTileInfo.<init>(SourceFile:72)
at com.esri.arcgisruntime.arcgisservices.TileInfo.<init>(SourceFile:121)

...

Is it the right approach to support other tiled format ? Is it some obvious error in the code snippet above that I do not see ?

Regards,

AlexanderNohe1

I took some time today and converted the 10.2.x sample to runtime 100:

This is the MBTilesLayer.java class:

<SPAN class="keyword token">package</SPAN> com<SPAN class="punctuation token">.</SPAN>arcgis<SPAN class="punctuation token">.</SPAN>apps<SPAN class="punctuation token">.</SPAN>mbtiles<SPAN class="punctuation token">;</SPAN>

<SPAN class="keyword token">import</SPAN> android<SPAN class="punctuation token">.</SPAN>database<SPAN class="punctuation token">.</SPAN>Cursor<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> android<SPAN class="punctuation token">.</SPAN>database<SPAN class="punctuation token">.</SPAN>SQLException<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> android<SPAN class="punctuation token">.</SPAN>database<SPAN class="punctuation token">.</SPAN>sqlite<SPAN class="punctuation token">.</SPAN>SQLiteDatabase<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> android<SPAN class="punctuation token">.</SPAN>util<SPAN class="punctuation token">.</SPAN>Log<SPAN class="punctuation token">;</SPAN>

<SPAN class="keyword token">import</SPAN> com<SPAN class="punctuation token">.</SPAN>esri<SPAN class="punctuation token">.</SPAN>arcgisruntime<SPAN class="punctuation token">.</SPAN>arcgisservices<SPAN class="punctuation token">.</SPAN>LevelOfDetail<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> com<SPAN class="punctuation token">.</SPAN>esri<SPAN class="punctuation token">.</SPAN>arcgisruntime<SPAN class="punctuation token">.</SPAN>arcgisservices<SPAN class="punctuation token">.</SPAN>TileInfo<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> com<SPAN class="punctuation token">.</SPAN>esri<SPAN class="punctuation token">.</SPAN>arcgisruntime<SPAN class="punctuation token">.</SPAN>data<SPAN class="punctuation token">.</SPAN>TileKey<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> com<SPAN class="punctuation token">.</SPAN>esri<SPAN class="punctuation token">.</SPAN>arcgisruntime<SPAN class="punctuation token">.</SPAN>geometry<SPAN class="punctuation token">.</SPAN>Envelope<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> com<SPAN class="punctuation token">.</SPAN>esri<SPAN class="punctuation token">.</SPAN>arcgisruntime<SPAN class="punctuation token">.</SPAN>geometry<SPAN class="punctuation token">.</SPAN>GeometryEngine<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> com<SPAN class="punctuation token">.</SPAN>esri<SPAN class="punctuation token">.</SPAN>arcgisruntime<SPAN class="punctuation token">.</SPAN>geometry<SPAN class="punctuation token">.</SPAN>Point<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> com<SPAN class="punctuation token">.</SPAN>esri<SPAN class="punctuation token">.</SPAN>arcgisruntime<SPAN class="punctuation token">.</SPAN>geometry<SPAN class="punctuation token">.</SPAN>SpatialReferences<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> com<SPAN class="punctuation token">.</SPAN>esri<SPAN class="punctuation token">.</SPAN>arcgisruntime<SPAN class="punctuation token">.</SPAN>layers<SPAN class="punctuation token">.</SPAN>ImageTiledLayer<SPAN class="punctuation token">;</SPAN>

<SPAN class="keyword token">import</SPAN> java<SPAN class="punctuation token">.</SPAN>util<SPAN class="punctuation token">.</SPAN>ArrayList<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">import</SPAN> java<SPAN class="punctuation token">.</SPAN>util<SPAN class="punctuation token">.</SPAN>List<SPAN class="punctuation token">;</SPAN>


<SPAN class="comment token">/**
 * The MBTilesLayer class allows you to work with a MBTiles stored in a SQLite
 * database.
 * 
 */</SPAN>
<SPAN class="keyword token">public</SPAN> <SPAN class="keyword token">class</SPAN> <SPAN class="token class-name">MBTilesLayer</SPAN> <SPAN class="keyword token">extends</SPAN> <SPAN class="token class-name">ImageTiledLayer</SPAN> <SPAN class="punctuation token">{</SPAN>

&nbsp; <SPAN class="keyword token">private</SPAN> SQLiteDatabase mapDb<SPAN class="punctuation token">;</SPAN>
&nbsp; <SPAN class="keyword token">private</SPAN> <SPAN class="keyword token">int</SPAN> mLevels <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp; <SPAN class="comment token">/**
&nbsp;&nbsp; * The constructor to instantiate MBTiles from a path on device
&nbsp;&nbsp; * 
&nbsp;&nbsp; * @param path
&nbsp;&nbsp; *&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; path is expected to be of the form /sdcard/path/package.mbtiles
&nbsp;&nbsp; */</SPAN>
&nbsp; <SPAN class="keyword token">public</SPAN> <SPAN class="keyword token">static</SPAN> MBTilesLayer <SPAN class="token function">init</SPAN><SPAN class="punctuation token">(</SPAN>String path<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; SQLiteDatabase mapDb<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">int</SPAN> mLevels <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">try</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mapDb <SPAN class="operator token">=</SPAN> SQLiteDatabase<SPAN class="punctuation token">.</SPAN><SPAN class="token function">openDatabase</SPAN><SPAN class="punctuation token">(</SPAN>path<SPAN class="punctuation token">,</SPAN> null<SPAN class="punctuation token">,</SPAN> SQLiteDatabase<SPAN class="punctuation token">.</SPAN>OPEN_READONLY<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN> <SPAN class="keyword token">catch</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="token class-name">SQLException</SPAN> ex<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Log<SPAN class="punctuation token">.</SPAN><SPAN class="token function">e</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"MBTiles"</SPAN><SPAN class="punctuation token">,</SPAN> ex<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getMessage</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">throw</SPAN> <SPAN class="punctuation token">(</SPAN>ex<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// Default TMS bounds = bounds of Web Mercator projection</SPAN>
&nbsp;&nbsp;&nbsp; Envelope envWGS <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Envelope</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="operator token">-</SPAN><SPAN class="number token">180.0</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="operator token">-</SPAN><SPAN class="number token">85.0511</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">180.0</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">85.0511</SPAN><SPAN class="punctuation token">,</SPAN> SpatialReferences<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getWgs84</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// See if the MBTiles DB defines their own Bounds in the metadata table</SPAN>
&nbsp;&nbsp;&nbsp; Cursor bounds <SPAN class="operator token">=</SPAN> mapDb<SPAN class="punctuation token">.</SPAN><SPAN class="token function">rawQuery</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"SELECT value FROM metadata WHERE name = 'bounds'"</SPAN><SPAN class="punctuation token">,</SPAN> null<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>bounds<SPAN class="punctuation token">.</SPAN><SPAN class="token function">moveToFirst</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String bs <SPAN class="operator token">=</SPAN> bounds<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getString</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String<SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN> ba <SPAN class="operator token">=</SPAN> bs<SPAN class="punctuation token">.</SPAN><SPAN class="token function">split</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">","</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">4</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>ba<SPAN class="punctuation token">.</SPAN>length <SPAN class="operator token">==</SPAN> <SPAN class="number token">4</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">double</SPAN> leftLon <SPAN class="operator token">=</SPAN> Double<SPAN class="punctuation token">.</SPAN><SPAN class="token function">parseDouble</SPAN><SPAN class="punctuation token">(</SPAN>ba<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">double</SPAN> topLat <SPAN class="operator token">=</SPAN> Double<SPAN class="punctuation token">.</SPAN><SPAN class="token function">parseDouble</SPAN><SPAN class="punctuation token">(</SPAN>ba<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">double</SPAN> rightLon <SPAN class="operator token">=</SPAN> Double<SPAN class="punctuation token">.</SPAN><SPAN class="token function">parseDouble</SPAN><SPAN class="punctuation token">(</SPAN>ba<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">double</SPAN> bottomLat <SPAN class="operator token">=</SPAN> Double<SPAN class="punctuation token">.</SPAN><SPAN class="token function">parseDouble</SPAN><SPAN class="punctuation token">(</SPAN>ba<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; envWGS <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Envelope</SPAN><SPAN class="punctuation token">(</SPAN>leftLon<SPAN class="punctuation token">,</SPAN> bottomLat<SPAN class="punctuation token">,</SPAN> rightLon<SPAN class="punctuation token">,</SPAN> topLat<SPAN class="punctuation token">,</SPAN> SpatialReferences<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getWgs84</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>

&nbsp;&nbsp;&nbsp; Envelope envWeb <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>Envelope<SPAN class="punctuation token">)</SPAN> GeometryEngine<SPAN class="punctuation token">.</SPAN><SPAN class="token function">project</SPAN><SPAN class="punctuation token">(</SPAN>envWGS<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SpatialReferences<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getWebMercator</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; Point origin <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Point</SPAN><SPAN class="punctuation token">(</SPAN>envWeb<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getXMin</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> envWeb<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getYMax</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> envWeb<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getSpatialReference</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; Cursor maxLevelCur <SPAN class="operator token">=</SPAN> mapDb<SPAN class="punctuation token">.</SPAN><SPAN class="token function">rawQuery</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"SELECT MAX(zoom_level) AS max_zoom FROM tiles"</SPAN><SPAN class="punctuation token">,</SPAN> null<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>maxLevelCur<SPAN class="punctuation token">.</SPAN><SPAN class="token function">moveToFirst</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mLevels <SPAN class="operator token">=</SPAN> maxLevelCur<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getInt</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>

&nbsp;&nbsp;&nbsp; Log<SPAN class="punctuation token">.</SPAN><SPAN class="token function">i</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"TAG"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Max levels = "</SPAN> <SPAN class="operator token">+</SPAN> Integer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">toString</SPAN><SPAN class="punctuation token">(</SPAN>mLevels<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">double</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN> resolution <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">double</SPAN><SPAN class="punctuation token">[</SPAN>mLevels<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">double</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN> scale <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">double</SPAN><SPAN class="punctuation token">[</SPAN>mLevels<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; List<SPAN class="operator token"><</SPAN>LevelOfDetail<SPAN class="operator token">></SPAN> lod <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">ArrayList</SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">></SPAN><SPAN class="punctuation token">(</SPAN>mLevels<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">int</SPAN> i <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN> i <SPAN class="operator token"><</SPAN> mLevels<SPAN class="punctuation token">;</SPAN> i<SPAN class="operator token">++</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// see the TMS spec for derivation of the level 0 scale and resolution</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// For each level the resolution (in meters per pixel) doubles</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; resolution<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> <SPAN class="number token">156543.032</SPAN> <SPAN class="operator token">/</SPAN> Math<SPAN class="punctuation token">.</SPAN><SPAN class="token function">pow</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN> i<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// Level 0 scale is 1:554,678,932. Each level doubles this.</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; scale<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> <SPAN class="number token">554678932</SPAN> <SPAN class="operator token">/</SPAN> Math<SPAN class="punctuation token">.</SPAN><SPAN class="token function">pow</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN> i<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; lod<SPAN class="punctuation token">.</SPAN><SPAN class="token function">add</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">LevelOfDetail</SPAN><SPAN class="punctuation token">(</SPAN>i<SPAN class="punctuation token">,</SPAN> resolution<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN> scale<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="comment token">/*
&nbsp;&nbsp;&nbsp;&nbsp; * Note, the constructor must set the following values or we won't send the
&nbsp;&nbsp;&nbsp;&nbsp; * status change events to listeners and the tiles will not be fetched
&nbsp;&nbsp;&nbsp;&nbsp; * 
&nbsp;&nbsp;&nbsp;&nbsp; * Origin is Top Left (web Mercator) , the rest are defined by the TMS
&nbsp;&nbsp;&nbsp;&nbsp; * Global-mercator spec (scales, resolution, 96dpi 256x256 pixel tiles) See:
<SPAN>&nbsp;&nbsp;&nbsp;&nbsp; * </SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=http%3A%2F%2Fwiki.osgeo.org%2Fwiki%2FTile_Map_Service_Specification%23global-mercator" target="_blank">http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification#global-mercator</A>
&nbsp;&nbsp;&nbsp;&nbsp; */</SPAN>
&nbsp;&nbsp;&nbsp; TileInfo ti <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">TileInfo</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">96</SPAN><SPAN class="punctuation token">,</SPAN> TileInfo<SPAN class="punctuation token">.</SPAN>ImageFormat<SPAN class="punctuation token">.</SPAN>PNG<SPAN class="punctuation token">,</SPAN> lod<SPAN class="punctuation token">,</SPAN> origin<SPAN class="punctuation token">,</SPAN> origin<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getSpatialReference</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">256</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">256</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">MBTilesLayer</SPAN><SPAN class="punctuation token">(</SPAN>ti<SPAN class="punctuation token">,</SPAN> envWeb<SPAN class="punctuation token">,</SPAN> mapDb<SPAN class="punctuation token">,</SPAN> mLevels<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp; <SPAN class="punctuation token">}</SPAN>

&nbsp; <SPAN class="keyword token">private</SPAN> <SPAN class="token function">MBTilesLayer</SPAN><SPAN class="punctuation token">(</SPAN>TileInfo tileInfo<SPAN class="punctuation token">,</SPAN> Envelope fullExtent<SPAN class="punctuation token">,</SPAN> SQLiteDatabase mapDb<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">int</SPAN> mLevels<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">super</SPAN><SPAN class="punctuation token">(</SPAN>tileInfo<SPAN class="punctuation token">,</SPAN> fullExtent<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN>mapDb <SPAN class="operator token">=</SPAN> mapDb<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN>mLevels <SPAN class="operator token">=</SPAN> mLevels<SPAN class="punctuation token">;</SPAN>
&nbsp; <SPAN class="punctuation token">}</SPAN>


&nbsp; @Override
&nbsp; <SPAN class="keyword token">protected</SPAN> <SPAN class="keyword token">byte</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="token function">getTile</SPAN><SPAN class="punctuation token">(</SPAN>TileKey tileKey<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// need to flip origin</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">int</SPAN> nRows <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="number token">1</SPAN> <SPAN class="operator token"><<</SPAN> tileKey<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getLevel</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="comment token">// Num rows = 2^level</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">int</SPAN> tmsRow <SPAN class="operator token">=</SPAN> nRows <SPAN class="operator token">-</SPAN> <SPAN class="number token">1</SPAN> <SPAN class="operator token">-</SPAN> tileKey<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getRow</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; Cursor imageCur <SPAN class="operator token">=</SPAN> mapDb<SPAN class="punctuation token">.</SPAN><SPAN class="token function">rawQuery</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"SELECT tile_data FROM tiles WHERE zoom_level = "</SPAN> <SPAN class="operator token">+</SPAN> Integer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">toString</SPAN><SPAN class="punctuation token">(</SPAN>tileKey<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getLevel</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="operator token">+</SPAN> <SPAN class="string token">" AND tile_column = "</SPAN> <SPAN class="operator token">+</SPAN> Integer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">toString</SPAN><SPAN class="punctuation token">(</SPAN>tileKey<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getColumn</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="string token">" AND tile_row = "</SPAN> <SPAN class="operator token">+</SPAN> Integer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">toString</SPAN><SPAN class="punctuation token">(</SPAN>tmsRow<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> null<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>imageCur<SPAN class="punctuation token">.</SPAN><SPAN class="token function">moveToFirst</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> imageCur<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getBlob</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> null<SPAN class="punctuation token">;</SPAN> <SPAN class="comment token">// Alternatively we might return a "no data" tile</SPAN>
&nbsp; <SPAN class="punctuation token">}</SPAN>
<SPAN class="punctuation token">}</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

And here is how I called it:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mapView = (MapView) findViewById(R.id.mapView);

    MBTilesLayer mbTilesLayer = MBTilesLayer.init(Environment.getExternalStorageDirectory().getPath() 
         + "/ArcGIS/mmpks/world_countries.mbtiles");

    ArcGISMap arcGISMap = new ArcGISMap(new Basemap(mbTilesLayer));


    mapView.setMap(arcGISMap);
}

There are some things I am avoiding (like runtime permissions) but this should be a good start for you to implement this in your applications.

I hope this helps!