WIP adding google maps uri support

app/src/main/java/it/danieleverducci/nextcloudmaps/utils/GoogleMapsUri.java

@@ -0,0 +1,33 @@
+package it.danieleverducci.nextcloudmaps.utils;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+
+/**
+ * Google maps doesn't honor geouri standard, instead implements its own uri.
+ * A geouri opens google maps, but the position is ignored, so it is needed to use gmaps own uri.
+ * Utility to check if gmaps is installed and generate a gmaps uri
+ */
+public class GoogleMapsUri {
+
+    public static boolean isGoogleMapsInstalled(Context context) {
+        try {
+            context.getPackageManager().getApplicationInfo("com.google.android.apps.maps", 0);
+            return true;
+        } catch (PackageManager.NameNotFoundException e) {
+            return false;
+        }
+    }
+
+    public static Uri createGmapsUri(double lat, double lon) {
+        // Check coords validity
+        if (lon <= -180 || lon >= 180 )
+            throw new IllegalArgumentException("Invalid longitude: " + lon);
+        if (lat <= -90 || lat >= 90)
+            throw new IllegalArgumentException("Invalid latitude: " + lat);
+
+        String uriStr = "https://www.google.com/maps/search/?api=1&query=" + lat + "," + lon;
+        return Uri.parse(uriStr);
+    }
+}