MBTiles raster tile source (#708)

vtm-android-example/AndroidManifest.xml

@@ -91,6 +91,9 @@
         <activity
             android:name=".MarkerOverlayActivity"
             android:configChanges="keyboardHidden|orientation|screenSize" />
+        <activity
+            android:name=".MBTilesBitmapTileActivity"
+            android:configChanges="keyboardHidden|orientation|screenSize" />
         <activity
             android:name=".MultiMapViewActivity"
             android:configChanges="keyboardHidden|orientation|screenSize" />

vtm-android-example/res/values/strings.xml

@@ -25,5 +25,8 @@
     <string name="search_key">\'*\' or OSM key</string>
     <string name="search_value">void or value</string>
     <string name="now">Now</string>
+    <string name="warning">Warning</string>
+    <string name="startup_message_mbtiles">To run this sample activity, you need any  MBTiles with filename test.mbtiles installed on storage.\n\nadb push file.mbtiles /sdcard/test.mbtiles</string>
+    <string name="exit">Exit</string>
 
 </resources>

vtm-android-example/src/org/oscim/android/test/MBTilesBitmapTileActivity.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2019 Andrea Antonello
+ * Copyright 2019 devemux86
+ *
+ * This program is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.oscim.android.test;
+
+import android.app.AlertDialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.os.Environment;
+import org.oscim.android.tiling.source.mbtiles.MBTilesBitmapTileSource;
+import org.oscim.core.BoundingBox;
+import org.oscim.core.MapPosition;
+import org.oscim.core.Tile;
+import org.oscim.layers.tile.bitmap.BitmapTileLayer;
+
+import java.io.File;
+
+/**
+ * An example activity making use of MBTiles.
+ */
+public class MBTilesBitmapTileActivity extends BitmapTileActivity {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        File file = new File(Environment.getExternalStorageDirectory(), "test.mbtiles");
+        if (!file.exists()) {
+            AlertDialog.Builder builder = new AlertDialog.Builder(this)
+                    .setTitle(R.string.warning)
+                    .setMessage(R.string.startup_message_mbtiles)
+                    .setPositiveButton(R.string.exit, new DialogInterface.OnClickListener() {
+                        @Override
+                        public void onClick(DialogInterface dialog, int which) {
+                            finish();
+                        }
+                    });
+            builder.show();
+            return;
+        }
+
+        MBTilesBitmapTileSource tileSource = new MBTilesBitmapTileSource(file.getAbsolutePath(), 128, null);
+        BitmapTileLayer bitmapLayer = new BitmapTileLayer(mMap, tileSource);
+        mMap.layers().add(bitmapLayer);
+
+        /* set initial position on first run */
+        MapPosition pos = new MapPosition();
+        mMap.getMapPosition(pos);
+        if (pos.x == 0.5 && pos.y == 0.5) {
+            BoundingBox bbox = tileSource.getBounds();
+            if (bbox != null) {
+                pos.setByBoundingBox(bbox, Tile.SIZE * 4, Tile.SIZE * 4);
+                mMap.setMapPosition(pos);
+            }
+        }
+    }
+}

vtm-android-example/src/org/oscim/android/test/Samples.java

@@ -8,6 +8,7 @@
  * Copyright 2017 nebular
  * Copyright 2018 boldtrn
  * Copyright 2018-2019 Gustl22
+ * Copyright 2019 Andrea Antonello
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
  *
@@ -115,6 +116,7 @@ public class Samples extends Activity {
 
         linearLayout.addView(createLabel("Raster Maps"));
         linearLayout.addView(createButton(BitmapTileActivity.class));
+        linearLayout.addView(createButton(MBTilesBitmapTileActivity.class));
 
         linearLayout.addView(createLabel("Overlays"));
         linearLayout.addView(createButton(MarkerOverlayActivity.class));