Show on map: everything is handled by one content provider alone.

To avoid issues forwarding a requests from (temporarily) exported content provider to internal content provider only one content provider is used.

src/main/java/de/dennisguse/opentracks/android/IContentResolver.java

@@ -0,0 +1,27 @@
+package de.dennisguse.opentracks.android;
+
+import android.content.ContentValues;
+import android.database.Cursor;
+import android.net.Uri;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresPermission;
+
+/**
+ * Defines the interface actually shared by {@link android.content.ContentProvider} and {@link android.content.ContentResolver}.
+ * So, both can be used interchangeably.
+ */
+public interface IContentResolver {
+    @Nullable
+    Uri insert(@RequiresPermission.Write @NonNull Uri url, @Nullable ContentValues values);
+
+    int bulkInsert(@RequiresPermission.Write @NonNull Uri url, @NonNull ContentValues[] values);
+
+    @Nullable
+    Cursor query(@RequiresPermission.Read @NonNull Uri uri, @Nullable String[] projection, @Nullable String selection, @Nullable String[] selectionArgs, @Nullable String sortOrder);
+
+    int update(@RequiresPermission.Write @NonNull Uri uri, @Nullable ContentValues values, @Nullable String where, @Nullable String[] selectionArgs);
+
+    int delete(@RequiresPermission.Write @NonNull Uri url, @Nullable String where, @Nullable String[] selectionArgs);
+}