Android: Scan on background thread and show progress

android/app/src/cpp/android_progress_callback.h

@@ -0,0 +1,38 @@
+#pragma once
+#include "common/progress_callback.h"
+#include <jni.h>
+
+class AndroidProgressCallback final : public BaseProgressCallback
+{
+public:
+  AndroidProgressCallback(JNIEnv* env, jobject java_object);
+  ~AndroidProgressCallback();
+
+  bool IsCancelled() const override;
+
+  void SetCancellable(bool cancellable) override;
+  void SetTitle(const char* title) override;
+  void SetStatusText(const char* text) override;
+  void SetProgressRange(u32 range) override;
+  void SetProgressValue(u32 value) override;
+
+  void DisplayError(const char* message) override;
+  void DisplayWarning(const char* message) override;
+  void DisplayInformation(const char* message) override;
+  void DisplayDebugMessage(const char* message) override;
+
+  void ModalError(const char* message) override;
+  bool ModalConfirmation(const char* message) override;
+  void ModalInformation(const char* message) override;
+
+private:
+  jobject m_java_object;
+
+  jmethodID m_set_title_method;
+  jmethodID m_set_status_text_method;
+  jmethodID m_set_progress_range_method;
+  jmethodID m_set_progress_value_method;
+  jmethodID m_modal_error_method;
+  jmethodID m_modal_confirmation_method;
+  jmethodID m_modal_information_method;
+};