Best dimension to put in the background Android app?

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I developed a splash for an android app and included a background image via the command:

android:background="@drawable/bg16"

The image appeared, but due to its dimensions, it was somewhat flattened. Is there any standard dimension for images in Android apps?

android android-layout

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You probably need one Nine-Patch. It’s basically a PNG file in which you specify two-dimensional regions that can be stretched:

Examplo de uma imagem NinePatch utilizada em um botão

Extracted from the documentation on the support to screens of different sizes:

If your UI uses bitmaps that need to fit the size of a view Even after the system Scales the layout (such as the background image for a button), you should use Nine-Patch bitmap files. A Nine-Patch file is Basically a PNG file in which you specify two-dimensional Regions that are stretchable. When the system needs to Scale the view in which the bitmap is used, the system stretches the Nine-Patch bitmap, but stretches only the specified Regions.

Nine-Patches can be created with Draw 9-patch tool included in Android Studio.

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    Thanks Cassio for the clarification. I will be accessing the link you gave me.

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