var upArrow = Resources.GetDrawable(Resource.Drawable.abc_ic_ab_back_material);
upArrow.SetColorFilter(Resources.GetColor(Android.Resource.Color.White), PorterDuff.Mode.SrcIn);
SupportActionBar.SetHomeAsUpIndicator(upArrow);
以上代码未更改箭头颜色。upArrow ColorFilter值为null。这是什么原因?我不是在问如何更改可绘制对象的颜色。我的问题是为什么上述代码不能设置颜色过滤器?以下是MainActivity代码。
public class MvxFormsApplicationActivity : FormsAppCompatActivity
{
protected override void OnCreate(Bundle bundle)
{
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
base.OnCreate(bundle);
Xamarin.Forms.Forms.Init(this, bundle); ;
//Plugins.NewictLib.Forms.Android.Renderers.GifImageViewRenderer.Init ();
DLToolkit.Forms.Controls.FlowListView.Init ();
UserDialogs.Init ((Activity) Xamarin.Forms.Forms.Context);
OxyPlot.Xamarin.Forms.Platform.Android.PlotViewRenderer.Init();
// var mvxFormsApp = new MvxFormsApp ();
// LoadApplication (mvxFormsApp);
var myApp = new MyFormsApp();
LoadApplication (myApp );
AppCompatDelegate.CompatVectorFromResourcesEnabled = true;
//the following needs to set so that the back button color can be changed
var upArrow = Resources.GetDrawable(Resource.Drawable.abc_ic_ab_back_material);
upArrow.SetColorFilter(Resources.GetColor(Android.Resource.Color.White), PorterDuff.Mode.SrcIn);
SupportActionBar.SetHomeAsUpIndicator(upArrow);
if (IsPlayServicesAvailable())
{
var intent = new Intent(this, typeof(RegistrationIntentService));
StartService(intent);
}
//var presenter = Mvx.Resolve<IMvxViewPresenter>() as MvxFormsDroidMasterDetailPagePresenter;
var presenter = Mvx.Resolve <IMvxViewPresenter> () as MVxFormsDroidCustomPagePresenter;//MvxFormsDroidPagePresenter;
if ( presenter == null ) {
throw new ArgumentNullException (nameof(presenter), "MvxFormsApplicationActivity: Please check your Activity class and ensure the presenter has value");
}
//presenter.MvxFormsApp = mvxFormsApp;
presenter.MvxFormsApp = oznesFormsApp;
Mvx.Resolve<IMvxAppStart>().Start();
}
}