[Android] Unified xenia-app with windowed apps and build prerequisites

src/xenia/ui/file_picker_android.cc

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+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2022 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <memory>
+
+#include "xenia/ui/file_picker.h"
+
+namespace xe {
+namespace ui {
+
+// TODO(Triang3l): An asynchronous file picker with a callback, starting an
+// activity for an ACTION_OPEN_DOCUMENT or an ACTION_OPEN_DOCUMENT_TREE intent.
+// This intent, however, provides a content URI, not the file path directly.
+// Accessing the file via the Storage Access Framework doesn't require the
+// READ_EXTERNAL_STORAGE permission, unlike opening a file by its path directly.
+// A file descriptor can be opened for the URI using
+// Context.getContentResolver().openFileDescriptor (it will return a
+// ParcelFileDescriptor, and a FileDescriptor can be obtained using its
+// getFileDescriptor() method).
+
+class AndroidFilePicker : public FilePicker {
+ public:
+  bool Show(Window* parent_window) override { return false; }
+};
+
+std::unique_ptr<FilePicker> FilePicker::Create() {
+  return std::make_unique<AndroidFilePicker>();
+}
+
+}  // namespace ui
+}  // namespace xe