I have been working on this for some time and unfortunately I've not been able to achieve the desired effect without using an image. I have researched on Stack Overflow and almost everywhere and still found no solution that does exactly this.
What I am still trying to do is this:
Phone is in light mode > Splash screen has a white background with the word ABC in black in the center
Phone is in dark mode > Splash screen has a black background with the word ABC in white in the center
Here is what I have so far:
SplashActivity.cs
namespace Japanese.Droid
{
[Activity(Label = "Anki+", Theme = "@style/LaunchTheme", MainLauncher = true, NoHistory = true)]
public class SplashActivity : Activity
{
styles.xaml
<style name="LaunchTheme" parent="Theme.AppCompat">
<item name="android:windowBackground">@drawable/splash_screen</item>
<item name="android:navigationBarColor">#ffffff</item>
</style>
splash_screen.xaml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@android:color/white"/>
<item>
<bitmap android:src="@drawable/splash_logo"
android:tileMode="disabled"
android:gravity="center"
android:layout_gravity="center"/>
</item>
</layer-list>
splash_screen_night.xaml
<?xml version="1.0" encoding="UTF-8" ?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@android:color/black"/>
<item>
<bitmap android:src="@drawable/splash_logo"
android:tileMode="disabled"
android:gravity="center"
android:layout_gravity="center"/>
</item>
</layer-list>
splash_activity
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Support.V7.App;
using Android.Views;
namespace Test.Droid
{
[Activity(Label = "Test+", Theme = "@style/LaunchTheme", MainLauncher = true, NoHistory = true)]
public class SplashActivity : Activity
{
public override void OnCreate(Bundle savedInstanceState, PersistableBundle persistentState)
{
base.OnCreate(savedInstanceState, persistentState);
//==================================== Code to hide the bottom 3 buttons on Android.
int uiOptions = (int)Window.DecorView.SystemUiVisibility;
uiOptions |= (int)SystemUiFlags.LowProfile;
uiOptions |= (int)SystemUiFlags.Fullscreen;
uiOptions |= (int)SystemUiFlags.HideNavigation;
uiOptions |= (int)SystemUiFlags.ImmersiveSticky;
Window.DecorView.SystemUiVisibility = (StatusBarVisibility)uiOptions;
//===================================
base.SetTheme(Resource.Style.MainTheme);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
}
// Launches the startup task
protected override void OnResume()
{
base.OnResume();
//==================================== Code to hide the bottom 3 buttons on Android.
int uiOptions = (int)Window.DecorView.SystemUiVisibility;
uiOptions |= (int)SystemUiFlags.LowProfile;
uiOptions |= (int)SystemUiFlags.Fullscreen;
uiOptions |= (int)SystemUiFlags.HideNavigation;
uiOptions |= (int)SystemUiFlags.ImmersiveSticky;
Window.DecorView.SystemUiVisibility = (StatusBarVisibility)uiOptions;
//===================================
System.Threading.Tasks.Task startupWork = new System.Threading.Tasks.Task(() => { SimulateStartup(); });
startupWork.Start();
}
// Simulates background work that happens behind the splash screen
async void SimulateStartup()
{
await System.Threading.Tasks.Task.Delay(1000); // Simulate a bit of startup work.
StartActivity(new Intent(Application.Context, typeof(MainActivity)));
}
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
{
Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
public override void OnBackPressed() { }
}
}
This uses an image but I would like to do it with text.
Does anyone know of a way to do it. I've researched this as much as possible, asked for help from two Android devs but still nobody can come up with a simple solution to do this without using an image.
Is it possible to do this with text only and not an image for my Xamarin Android application?
