Added Ui for Search bar for message searching and also manage exit button on Action bar

src/bitmessagekivy/main.kv

@@ -46,13 +46,23 @@ BoxLayout:
         title: app.getCurrentAccount()
         background_color: app.theme_cls.primary_dark
         left_action_items: [['menu', lambda x: app.nav_drawer.toggle()]]
-        Button:
-            text:"EXIT"
-            color: 0,0,0,1
-            background_color: (0,0,0,0)
-            size_hint_y: 0.4
-            size_hint_x: 0.1
-            pos_hint: {'x': 0.8, 'y':0.4}
+
+        ActionView:
+            SearchBar:
+                size_hint_x: 1.7
+                size_hint_y: .5
+                pos_hint: {'x': 0, 'center_y':.5}
+                on_text_validate: searchbutt.trigger_action()
+
+            ActionPrevious:
+                with_previous: False
+                app_icon:  ''
+
+            ActionOverflow:
+                ActionButton:
+                    text: 'Filters'
+                ActionButton:
+                    text: 'Exit'
                     on_press: app.say_exit()
 
     ScreenManager:

src/bitmessagekivy/mpybit.py

@@ -20,6 +20,7 @@ from helper_ackPayload import genAckPayload
 from addresses import decodeAddress, addBMIfNotPresent
 from helper_sql import sqlExecute
 from kivy.core.window import Window
+from kivy.uix.actionbar import ActionItem
 
 statusIconColor = 'red'
 
@@ -43,11 +44,15 @@ class NavigateApp(App, TextInput):
         return main_widget
 
     def _key_handler(self, instance, key, *args):
+        """Escape key manages previous screen on back."""
         if key is 27:
+            print(args)
+            print(instance)
             self.set_previous_screen()
             return True
 
     def set_previous_screen(self):
+        """Set previous screen based on back."""
         if self.root.ids.scr_mngr.current != 'inbox':
             self.root.ids.scr_mngr.transition.direction = 'left'
             self.root.ids.scr_mngr.current = 'inbox'
@@ -401,5 +406,15 @@ class NewIdentity(Screen):
             self.manager.current = 'add_sucess'
 
 
+class SearchBar(TextInput, ActionItem):
+    def __init__(self, *args, **kwargs):
+        super(SearchBar, self).__init__(*args, **kwargs)
+        self.hint_text = 'Search'
+
+    def search(self):
+        request = self.text
+        return str(request)
+
+
 if __name__ == '__main__':
     NavigateApp().run()