Android example for render theme styles #93, closes #255

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

@@ -118,7 +118,7 @@ public class MapsforgeMapActivity extends MapActivity {
             if (tileSource.setMapFile(file)) {
 
                 VectorTileLayer l = mMap.setBaseMap(tileSource);
-                mMap.setTheme(VtmThemes.DEFAULT);
+                loadTheme(null);
 
                 mMap.layers().add(new BuildingLayer(mMap, l));
                 mMap.layers().add(new LabelLayer(mMap, l));
@@ -132,4 +132,8 @@ public class MapsforgeMapActivity extends MapActivity {
             }
         }
     }
+
+    protected void loadTheme(final String styleId) {
+        mMap.setTheme(VtmThemes.DEFAULT);
+    }
 }

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

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2016 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.view.Menu;
+import android.view.MenuItem;
+import android.widget.Toast;
+
+import org.oscim.android.theme.AssetsRenderTheme;
+import org.oscim.theme.XmlRenderThemeMenuCallback;
+import org.oscim.theme.XmlRenderThemeStyleLayer;
+import org.oscim.theme.XmlRenderThemeStyleMenu;
+
+import java.util.Set;
+
+/**
+ * Load render theme from Android assets folder and show a configuration menu based on stylemenu.
+ */
+public class MapsforgeStyleActivity extends MapsforgeMapActivity {
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.style_menu, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.style_1:
+                item.setChecked(true);
+                loadTheme("1");
+                mMap.clearMap();
+                Toast.makeText(this, "Show nature layers", Toast.LENGTH_SHORT).show();
+                return true;
+            case R.id.style_2:
+                item.setChecked(true);
+                loadTheme("2");
+                mMap.clearMap();
+                Toast.makeText(this, "Hide nature layers", Toast.LENGTH_SHORT).show();
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    @Override
+    protected void loadTheme(final String styleId) {
+        mMap.setTheme(new AssetsRenderTheme(this, "", "vtm/stylemenu.xml", new XmlRenderThemeMenuCallback() {
+            @Override
+            public Set<String> getCategories(XmlRenderThemeStyleMenu renderThemeStyleMenu) {
+                // Use the selected style or the default
+                String style = styleId != null ? styleId : renderThemeStyleMenu.getDefaultValue();
+
+                // Retrieve the layer from the style id
+                XmlRenderThemeStyleLayer renderThemeStyleLayer = renderThemeStyleMenu.getLayer(style);
+                if (renderThemeStyleLayer == null) {
+                    System.err.println("Invalid style " + style);
+                    return null;
+                }
+
+                // First get the selected layer's categories that are enabled together
+                Set<String> categories = renderThemeStyleLayer.getCategories();
+
+                // Then add the selected layer's overlays that are enabled individually
+                // Here we use the style menu, but users can use their own preferences
+                for (XmlRenderThemeStyleLayer overlay : renderThemeStyleLayer.getOverlays()) {
+                    if (overlay.isEnabled())
+                        categories.addAll(overlay.getCategories());
+                }
+
+                // This is the whole categories set to be enabled
+                return categories;
+            }
+        }));
+    }
+}

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

@@ -41,6 +41,7 @@ public class Samples extends Activity {
         LinearLayout linearLayout = (LinearLayout) findViewById(R.id.samples);
         linearLayout.addView(createButton(SimpleMapActivity.class));
         linearLayout.addView(createButton(MapsforgeMapActivity.class));
+        linearLayout.addView(createButton(MapsforgeStyleActivity.class));
         linearLayout.addView(createButton(MapboxMapActivity.class));
         linearLayout.addView(createButton(OsmJsonMapActivity.class));