CustomPicker Ok and Cancel buttons' color - xamarin.forms

Question

I have this custompicker class in android project:
public class CustomPickerRenderer : PickerRenderer
{
private Context context;
private IElementController ElementController => Element as IElementController;
private AlertDialog _dialog;
public CustomPickerRenderer(Context context) : base(context)
{
this.context = context;
}
protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
{
base.OnElementChanged(e);
if (Control == null || e.NewElement == null) return;
Control.Click += Control_Click1;
}
protected override void Dispose(bool disposing)
{
Control.Click -= Control_Click1;
base.Dispose(disposing);
}
private void Control_Click1(object sender, EventArgs e)
{
Picker model = Element;
var picker = new NumberPicker(Context);
if (model.Items != null && model.Items.Any())
{
picker.MaxValue = model.Items.Count - 1;
picker.MinValue = 0;
picker.SetDisplayedValues(model.Items.ToArray());
picker.WrapSelectorWheel = false;
picker.DescendantFocusability = DescendantFocusability.BlockDescendants;
picker.Value = model.SelectedIndex;
}
var layout = new LinearLayout(Context) { Orientation = Orientation.Vertical };
layout.AddView(picker);
ElementController.SetValueFromRenderer(VisualElement.IsFocusedProperty, true);
var builder = new AlertDialog.Builder(Context);
builder.SetView(layout);
builder.SetTitle(model.Title ?? "");
//change the text or color here
builder.SetNegativeButton(Html.FromHtml("<font color='#039BE5'>Cancel</font>"), (s, a) =>
{
ElementController.SetValueFromRenderer(VisualElement.IsFocusedProperty, false);
// It is possible for the Content of the Page to be changed when Focus is changed.
// In this case, we'll lose our Control.
Control?.ClearFocus();
_dialog = null;
});
//change the text or color here
builder.SetPositiveButton(Html.FromHtml("<font color='#039BE5'>OK</font>"), (s, a) =>
{
ElementController.SetValueFromRenderer(Picker.SelectedIndexProperty, picker.Value);
// It is possible for the Content of the Page to be changed on SelectedIndexChanged.
// In this case, the Element & Control will no longer exist.
if (Element != null)
{
if (model.Items.Count > 0 && Element.SelectedIndex >= 0)
Control.Text = model.Items[Element.SelectedIndex];
ElementController.SetValueFromRenderer(VisualElement.IsFocusedProperty, false);
// It is also possible for the Content of the Page to be changed when Focus is changed.
// In this case, we'll lose our Control.
Control?.ClearFocus();
}
_dialog = null;
});
_dialog = builder.Create();
_dialog.DismissEvent += (ssender, args) =>
{
ElementController?.SetValueFromRenderer(VisualElement.IsFocusedProperty, false);
};
_dialog.Show();
}
}
I tried running my project on my phone Xiaomi POCOPHONE F1 (Android 9) and 2 emulators (Android 8.1) and the colors of cancel and ok buttons are designed Perfectly. But when I tried running the project on Huawei PLE-701L and SAMSUNG SM-T365 (Android 5.1) the color of the buttons didn't changed.
Any suggestions?

Answer 1

Get the button object through the API of dialog and set the text color of the button. This method can be personalized. One point needs to be noted: it must be called after show
in your custom renderer,below _dialog.Show();
....
_dialog.Show();
Button btnOk = _dialog.GetButton((int)DialogInterface.ButtonPositive);
btnOk .SetTextColor(Color.Red);
Button btnCancel= _dialog.GetButton((int)DialogInterface.ButtonNegative);
btnCancel.SetTextColor(Color.Red);

Answer 2

add this style in style.xml
<style name="SpinnerDialog" parent="Theme.AppCompat.Light.Dialog">
<item name="android:popupBackground">#ff00ff</item>
<item name="colorPrimary">#ff00ff</item>
<item name="colorPrimaryDark">#ffff00</item>
<item name="colorAccent">#ff0000</item>
</style>
you can change allthe color including buttons.
and you can also use
<style name="AlertDialogCustom" parent="android:Theme.Material.Light.Dialog.Alert">
<item name="android:colorPrimary">#1e87f0</item>
<item name="android:colorAccent">#1e87f0</item>
</style>
<style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">
<item name="colorAccent">#1e87f0</item>
</style>

Answer 3

The Question is answered here: Picker button's color not changing on android 5.1
I added the styles code in the correct answer in the link, and it worked!