Add a function that minimizes the Android app (#692)

Add a function that minimizes the Android app

client/ui/controllers/pageController.cpp

@@ -7,6 +7,7 @@
 #endif
 
 #ifdef Q_OS_ANDROID
+    #include "platforms/android/android_controller.h"
     #include "platforms/android/android_utils.h"
     #include <QJniObject>
 #endif
@@ -74,6 +75,13 @@ void PageController::closeWindow()
 #endif
 }
 
+void PageController::hideWindow()
+{
+#ifdef Q_OS_ANDROID
+    AndroidController::instance()->minimizeApp();
+#endif
+}
+
 void PageController::keyPressEvent(Qt::Key key)
 {
     switch (key) {

client/ui/controllers/pageController.h

@@ -76,6 +76,7 @@ public slots:
     QString getPagePath(PageLoader::PageEnum page);
 
     void closeWindow();
+    void hideWindow();
     void keyPressEvent(Qt::Key key);
 
     unsigned int getInitialPageNavigationBarColor();

client/ui/qml/Pages2/PageSetupWizardStart.qml

@@ -24,6 +24,7 @@ PageType {
 
         function onClosePage() {
             if (stackView.depth <= 1) {
+                PageController.hideWindow()
                 return
             }
             stackView.pop()

client/ui/qml/Pages2/PageStart.qml

@@ -40,6 +40,7 @@ PageType {
 
         function onClosePage() {
             if (tabBarStackView.depth <= 1) {
+                PageController.hideWindow()
                 return
             }
             tabBarStackView.pop()