Public API: enable other applications to start recordings.

Fixes #671.

src/main/java/de/dennisguse/opentracks/settings/PreferencesUtils.java

@@ -28,7 +28,6 @@ import android.util.Log;
 import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
 import androidx.appcompat.app.AppCompatDelegate;
-import androidx.documentfile.provider.DocumentFile;
 import androidx.preference.PreferenceManager;
 
 import java.time.Duration;
@@ -179,6 +178,10 @@ public class PreferencesUtils {
         editor.apply();
     }
 
+    public static boolean isPublicAPIenabled() {
+        return getBoolean(R.string.publicapi_enabled_key, resources.getBoolean(R.bool.publicapi_enabled_default));
+    }
+
     public static boolean isMetricUnits() {
         final String STATS_UNIT = resources.getString(R.string.stats_units_default);
         return STATS_UNIT.equals(getString(R.string.stats_units_key, STATS_UNIT));