prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Error on Android when converting selection value to String
  Sample app:
  ```
  import toga
  from toga.style import Pack
  from toga.style.pack import COLUMN, ROW
  
  class AFV(toga.App):
  
      def startup(self):
          self.main_window = toga.MainWindow(title=self.formal_name)
  
          box_test = toga.Box(style=Pack(direction=COLUMN, padding=5))
          self.label_1 = toga.Label('TESTE 1')
          self.comboBox_1 = toga.Selection(items=["ITEM 1", "ITEM 2", "ITEM 3"])
          self.lineEdit_1 = toga.TextInput()
          self.pushButton_1 = toga.Button('TESTE')
  
          box_test.add(self.label_1, self.comboBox_1, self.lineEdit_1, self.pushButton_1)
  
          self.pushButton_1.on_press = self.print_combo
  
          self.main_window.content = box_test
          self.main_window.show()
  
      def print_combo(self, widget):
          name_combo = self.comboBox_1.value
          print(name_combo)
  
  
  
  def main():
      return AFV()
  ```
  
  When the button is pressed, the error:
  
          com.chaquo.python.PyException: AttributeError: 'str' object has no attribute 'toString'
  
  is raised.
  
  Using Briefcase 0.3.10; worked previously on Briefcase 0.3.9.
  Error on Android when converting selection value to String
  Sample app:
  ```
  import toga
  from toga.style import Pack
  from toga.style.pack import COLUMN, ROW
  
  class AFV(toga.App):
  
      def startup(self):
          self.main_window = toga.MainWindow(title=self.formal_name)
  
          box_test = toga.Box(style=Pack(direction=COLUMN, padding=5))
          self.label_1 = toga.Label('TESTE 1')
          self.comboBox_1 = toga.Selection(items=["ITEM 1", "ITEM 2", "ITEM 3"])
          self.lineEdit_1 = toga.TextInput()
          self.pushButton_1 = toga.Button('TESTE')
  
          box_test.add(self.label_1, self.comboBox_1, self.lineEdit_1, self.pushButton_1)
  
          self.pushButton_1.on_press = self.print_combo
  
          self.main_window.content = box_test
          self.main_window.show()
  
      def print_combo(self, widget):
          name_combo = self.comboBox_1.value
          print(name_combo)
  
  
  
  def main():
      return AFV()
  ```
  
  When the button is pressed, the error:
  
          com.chaquo.python.PyException: AttributeError: 'str' object has no attribute 'toString'
  
  is raised.
  
  Using Briefcase 0.3.10; worked previously on Briefcase 0.3.9.
  
  </issue>
  <code>
  [start of src/android/toga_android/widgets/selection.py]
  1 from travertino.size import at_least
  2 
  3 from ..libs.android import R__layout
  4 from ..libs.android.view import Gravity, View__MeasureSpec
  5 from ..libs.android.widget import ArrayAdapter, OnItemSelectedListener, Spinner
  6 from .base import Widget, align
  7 
  8 
  9 class TogaOnItemSelectedListener(OnItemSelectedListener):
  10     def __init__(self, impl):
  11         super().__init__()
  12         self._impl = impl
  13 
  14     def onItemSelected(self, _parent, _view, _position, _id):
  15         if self._impl.interface.on_select:
  16             self._impl.interface.on_select(widget=self._impl.interface)
  17 
  18 
  19 class Selection(Widget):
  20     def create(self):
  21         self.native = Spinner(self._native_activity, Spinner.MODE_DROPDOWN)
  22         self.native.setOnItemSelectedListener(TogaOnItemSelectedListener(
  23             impl=self
  24         ))
  25         # On Android, the list of options is provided to the `Spinner` wrapped in
  26         # an `ArrayAdapter`. We store `self.adapter` to avoid having to typecast it
  27         # in `add_item()`.
  28         self.adapter = ArrayAdapter(
  29             self._native_activity,
  30             R__layout.simple_spinner_item
  31         )
  32         self.adapter.setDropDownViewResource(R__layout.simple_spinner_dropdown_item)
  33         self.native.setAdapter(self.adapter)
  34         # Create a mapping from text to numeric index to support `select_item()`.
  35         self._indexByItem = {}
  36 
  37     def add_item(self, item):
  38         new_index = self.adapter.getCount()
  39         self.adapter.add(str(item))
  40         self._indexByItem[item] = new_index
  41 
  42     def select_item(self, item):
  43         self.native.setSelection(self._indexByItem[item])
  44 
  45     def get_selected_item(self):
  46         selected = self.native.getSelectedItem()
  47         if selected:
  48             return selected.toString()
  49         else:
  50             return None
  51 
  52     def remove_all_items(self):
  53         self.adapter.clear()
  54 
  55     def rehint(self):
  56         self.native.measure(
  57             View__MeasureSpec.UNSPECIFIED, View__MeasureSpec.UNSPECIFIED
  58         )
  59         self.interface.intrinsic.width = at_least(self.native.getMeasuredWidth())
  60         self.interface.intrinsic.height = self.native.getMeasuredHeight()
  61 
  62     def set_alignment(self, value):
  63         self.native.setGravity(Gravity.CENTER_VERTICAL | align(value))
  64 
  65     def set_on_select(self, handler):
  66         # No special handling is required.
  67         pass
  68
  [end of src/android/toga_android/widgets/selection.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/src/android/toga_android/widgets/selection.py b/src/android/toga_android/widgets/selection.py
  --- a/src/android/toga_android/widgets/selection.py
  +++ b/src/android/toga_android/widgets/selection.py
  @@ -22,9 +22,6 @@
           self.native.setOnItemSelectedListener(TogaOnItemSelectedListener(
               impl=self
           ))
  -        # On Android, the list of options is provided to the `Spinner` wrapped in
  -        # an `ArrayAdapter`. We store `self.adapter` to avoid having to typecast it
  -        # in `add_item()`.
           self.adapter = ArrayAdapter(
               self._native_activity,
               R__layout.simple_spinner_item
  @@ -45,7 +42,7 @@
       def get_selected_item(self):
           selected = self.native.getSelectedItem()
           if selected:
  -            return selected.toString()
  +            return str(selected)
           else:
               return None
  
verification_info: {"golden_diff": "diff --git a/src/android/toga_android/widgets/selection.py b/src/android/toga_android/widgets/selection.py\n--- a/src/android/toga_android/widgets/selection.py\n+++ b/src/android/toga_android/widgets/selection.py\n@@ -22,9 +22,6 @@\n         self.native.setOnItemSelectedListener(TogaOnItemSelectedListener(\n             impl=self\n         ))\n-        # On Android, the list of options is provided to the `Spinner` wrapped in\n-        # an `ArrayAdapter`. We store `self.adapter` to avoid having to typecast it\n-        # in `add_item()`.\n         self.adapter = ArrayAdapter(\n             self._native_activity,\n             R__layout.simple_spinner_item\n@@ -45,7 +42,7 @@\n     def get_selected_item(self):\n         selected = self.native.getSelectedItem()\n         if selected:\n-            return selected.toString()\n+            return str(selected)\n         else:\n             return None\n", "issue": "Error on Android when converting selection value to String\nSample app:\r\n```\r\nimport toga\r\nfrom toga.style import Pack\r\nfrom toga.style.pack import COLUMN, ROW\r\n\r\nclass AFV(toga.App):\r\n\r\n    def startup(self):\r\n        self.main_window = toga.MainWindow(title=self.formal_name)\r\n\r\n        box_test = toga.Box(style=Pack(direction=COLUMN, padding=5))\r\n        self.label_1 = toga.Label('TESTE 1')\r\n        self.comboBox_1 = toga.Selection(items=[\"ITEM 1\", \"ITEM 2\", \"ITEM 3\"])\r\n        self.lineEdit_1 = toga.TextInput()\r\n        self.pushButton_1 = toga.Button('TESTE')\r\n\r\n        box_test.add(self.label_1, self.comboBox_1, self.lineEdit_1, self.pushButton_1)\r\n\r\n        self.pushButton_1.on_press = self.print_combo\r\n\r\n        self.main_window.content = box_test\r\n        self.main_window.show()\r\n\r\n    def print_combo(self, widget):\r\n        name_combo = self.comboBox_1.value\r\n        print(name_combo)\r\n\r\n\r\n\r\ndef main():\r\n    return AFV()\r\n```\r\n\r\nWhen the button is pressed, the error:\r\n\r\n        com.chaquo.python.PyException: AttributeError: 'str' object has no attribute 'toString'\r\n\r\nis raised.\r\n\r\nUsing Briefcase 0.3.10; worked previously on Briefcase 0.3.9.\nError on Android when converting selection value to String\nSample app:\r\n```\r\nimport toga\r\nfrom toga.style import Pack\r\nfrom toga.style.pack import COLUMN, ROW\r\n\r\nclass AFV(toga.App):\r\n\r\n    def startup(self):\r\n        self.main_window = toga.MainWindow(title=self.formal_name)\r\n\r\n        box_test = toga.Box(style=Pack(direction=COLUMN, padding=5))\r\n        self.label_1 = toga.Label('TESTE 1')\r\n        self.comboBox_1 = toga.Selection(items=[\"ITEM 1\", \"ITEM 2\", \"ITEM 3\"])\r\n        self.lineEdit_1 = toga.TextInput()\r\n        self.pushButton_1 = toga.Button('TESTE')\r\n\r\n        box_test.add(self.label_1, self.comboBox_1, self.lineEdit_1, self.pushButton_1)\r\n\r\n        self.pushButton_1.on_press = self.print_combo\r\n\r\n        self.main_window.content = box_test\r\n        self.main_window.show()\r\n\r\n    def print_combo(self, widget):\r\n        name_combo = self.comboBox_1.value\r\n        print(name_combo)\r\n\r\n\r\n\r\ndef main():\r\n    return AFV()\r\n```\r\n\r\nWhen the button is pressed, the error:\r\n\r\n        com.chaquo.python.PyException: AttributeError: 'str' object has no attribute 'toString'\r\n\r\nis raised.\r\n\r\nUsing Briefcase 0.3.10; worked previously on Briefcase 0.3.9.\n", "before_files": [{"content": "from travertino.size import at_least\n\nfrom ..libs.android import R__layout\nfrom ..libs.android.view import Gravity, View__MeasureSpec\nfrom ..libs.android.widget import ArrayAdapter, OnItemSelectedListener, Spinner\nfrom .base import Widget, align\n\n\nclass TogaOnItemSelectedListener(OnItemSelectedListener):\n    def __init__(self, impl):\n        super().__init__()\n        self._impl = impl\n\n    def onItemSelected(self, _parent, _view, _position, _id):\n        if self._impl.interface.on_select:\n            self._impl.interface.on_select(widget=self._impl.interface)\n\n\nclass Selection(Widget):\n    def create(self):\n        self.native = Spinner(self._native_activity, Spinner.MODE_DROPDOWN)\n        self.native.setOnItemSelectedListener(TogaOnItemSelectedListener(\n            impl=self\n        ))\n        # On Android, the list of options is provided to the `Spinner` wrapped in\n        # an `ArrayAdapter`. We store `self.adapter` to avoid having to typecast it\n        # in `add_item()`.\n        self.adapter = ArrayAdapter(\n            self._native_activity,\n            R__layout.simple_spinner_item\n        )\n        self.adapter.setDropDownViewResource(R__layout.simple_spinner_dropdown_item)\n        self.native.setAdapter(self.adapter)\n        # Create a mapping from text to numeric index to support `select_item()`.\n        self._indexByItem = {}\n\n    def add_item(self, item):\n        new_index = self.adapter.getCount()\n        self.adapter.add(str(item))\n        self._indexByItem[item] = new_index\n\n    def select_item(self, item):\n        self.native.setSelection(self._indexByItem[item])\n\n    def get_selected_item(self):\n        selected = self.native.getSelectedItem()\n        if selected:\n            return selected.toString()\n        else:\n            return None\n\n    def remove_all_items(self):\n        self.adapter.clear()\n\n    def rehint(self):\n        self.native.measure(\n            View__MeasureSpec.UNSPECIFIED, View__MeasureSpec.UNSPECIFIED\n        )\n        self.interface.intrinsic.width = at_least(self.native.getMeasuredWidth())\n        self.interface.intrinsic.height = self.native.getMeasuredHeight()\n\n    def set_alignment(self, value):\n        self.native.setGravity(Gravity.CENTER_VERTICAL | align(value))\n\n    def set_on_select(self, handler):\n        # No special handling is required.\n        pass\n", "path": "src/android/toga_android/widgets/selection.py"}]}