My bitmap is not always displayed in the same size on my Android tablet. It looks bigger when I use it as splash screen.

Question

I use a png bitmap file in my splash screen. In addition, I have tried to display exactly the same image with ImageView but then the bitmap looks much smaller on my Android tablet.

The image resolution is 288x288 px and I use the same image resolution in the drawable folders because I'm not sure which resolutions I should use for each folder. I have added the image splash_logo to the following drawable folders:

drawable-mdpi

drawable-hdpi

drawable-xhdpi

drawable-xxhdpi

drawable-xxxhdpi

The file ic_splash_screen_image.xml is located in the folder Drawable:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <item>
    <color android:color="@color/splash_background"/>
  </item>
  <item>
    <bitmap
        android:src="@drawable/splash_logo"
        android:tileMode="disabled"
        android:gravity="center"/>
  </item>
</layer-list>

The files colors.xml and styles.xml are located in the folder Values:

<?xml version="1.0" encoding="UTF-8" ?>
<resources>
  <color name="splash_background">#000000</color>
  <color name="custom_color">#4cb3fc</color>
</resources>

<?xml version="1.0" encoding="UTF-8" ?>
<resources>
     <style name="MainTheme" parent="MainTheme.Base">
    </style>
    <style name="MainTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="windowNoTitle">true</item>
        <item name="windowActionBar">false</item>
         <item name="android:windowFullscreen">true</item>
        <item name="android:colorPrimary">#2196F3</item>
        <item name="android:colorPrimaryDark">#1976D2</item>
        <item name="android:colorAccent">#FF4081</item>
         <item name="android:windowLightStatusBar">false</item>
        <item name="android:windowActionModeOverlay">true</item>
        <item name="android:windowIsTranslucent">true</item>
    </style>
    <style name="SplashTheme" parent ="Theme.SplashScreen">
    <item name="windowSplashScreenBackground">@android:color/black</item>
    <item name="windowSplashScreenAnimatedIcon">@drawable/ic_splash_screen_image</item>
	<item name="postSplashScreenTheme">@style/MainTheme</item>
	<item name="android:windowLightStatusBar">true</item>
  </style>
</resources>

In Activity1.cs, I ise the following code to draw the image:

[Activity(
Label = "@string/app_name",
MainLauncher = true,
Icon = "@mipmap/icon",
Theme = "@style/SplashTheme",
AlwaysRetainTaskState = true,
LaunchMode = LaunchMode.SingleInstance,
ScreenOrientation = ScreenOrientation.UserLandscape,         ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.Keyboard | ConfigChanges.KeyboardHidden | ConfigChanges.ScreenSize
)]

public class Activity1 : AndroidGameActivity, ViewTreeObserver.IOnGlobalFocusChangeListener
{

FrameLayout layout;
View splashView;

protected override void OnCreate(Bundle bundle)
{
    AndroidX.Core.SplashScreen.SplashScreen.InstallSplashScreen(this);
    base.SetTheme(Resource.Style.MainTheme);
    base.OnCreate(bundle);

    layout = new FrameLayout(this.ApplicationContext);
    layout.AddView((View)_game.Services.GetService(typeof(View)));           
    splashView = new ImageView(this.ApplicationContext);
    ((ImageView)splashView).SetBackgroundResource(Resource.Drawable.ic_splash_screen_image);
    layout.AddView(splashView);
    SetContentView(layout);
}
}

Why does the bitmap look much smaller when I use ImageView instead of the splash screen to draw the bitmap?

Answer 1

Hello,

I've noticed that the way you set up splashscreen is based on setting up a new activity in the Xamarin documentation.

This is actually the splashscreen setup method for older versions of Android, and the ImageView is not automatically resized as an icon, so the icons you set to multiple resolutions won't actually work.

For the best practices for setting up splashscreen on Android, please refer to this official Google documentation.

Best Regards,

Alec Liu.

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Answer 2

You can't use the old layer-list xmlns:android technique once you moved to Android12+. The following link shows how to do a splash screen for Android 12 and above. https://github.com/gmck/XamarinBasicSplashScreen. There is also a Net7 version of the same app, which could just as easily be converted to a Net8 version.