Sensible default for geouri/gmaps setting

app/src/main/AndroidManifest.xml

@@ -25,6 +25,8 @@
 
     <queries>
         <package android:name="com.nextcloud.client" />
+        <!-- To see if Google Maps is installed, as it needs a specific intent Uri) -->
+        <package android:name="com.google.android.apps.maps" />
     </queries>
 
     <application

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

@@ -2,6 +2,7 @@ package it.danieleverducci.nextcloudmaps.utils;
 
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.content.pm.PackageManager;
 
 import androidx.preference.PreferenceManager;
 import it.danieleverducci.nextcloudmaps.activity.main.GeofavoriteAdapter;
@@ -50,7 +51,7 @@ public class SettingsManager {
 
     public static boolean isUseGoogleMaps(Context context) {
         return PreferenceManager.getDefaultSharedPreferences(context)
-                .getBoolean(SETTING_USE_GOOGLE_MAPS, true);
+                .getBoolean(SETTING_USE_GOOGLE_MAPS, isGoogleMapsInstalled(context));
     }
 
     public static void setUseGoogleMaps(Context context, boolean value) {
@@ -65,4 +66,13 @@ public class SettingsManager {
                 .putFloat(SETTING_LAST_MAP_POSITION_ZOOM, (float)zoom)
                 .apply();
     }
+
+    private static boolean isGoogleMapsInstalled(Context context) {
+        try {
+            context.getPackageManager().getApplicationInfo("com.google.android.apps.maps", 0);
+            return true;
+        } catch (PackageManager.NameNotFoundException e) {
+            return false;
+        }
+    }
 }