You need to copy your images to assets and use getAssets().open("yourimage.jpg").
Source:
Android files in jar library not accessible when using with Unity
Android files in jar library not accessible when using with Unity - Please help
2 scoreaccepted
Images are not accessible using the context.getClassLoader.getResaurceAsStream from android jar in Unity plugin
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2
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138
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CC BY-SA 3.0
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