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For my Android-app I'm using the ABI "x86" and "armeabi" right now. The armeabi is used for all ARM-devices, including armv7a and arm64-v8a.
Now I would like to remove the "armeabi" and just continue with "x86" and "armeabi-v7a".
I haven't found any hint in the docs, that ARMv8 is also compatible with ARMv7 - can anyone confirm that my app will still work on devices running arm64-v8a, if I don't offer an armeabi but now an armeabi-v7a-library?
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Many modern Android devices (i.e. Nexus 5x) have AArch64 processors with arm64-v8a instruction set. Both - armeabi and armeabi-v7a - libraries run fine on these modern devices. Therefore, we can assume the answer to your question to be 'YES'.
armeabi-v7a is the older target, for 32 bit arm cpus, almost all arm devices support this target. arm64-v8a is the more recent 64 bit target (similar to the 32-bit -> 64 bit transition in desktop computers).
64-bit SoCs ( ARMV8 archictecture ) can run 32-bit apps, but 32-bit SoCs ( ARMV7 aechitecture ) cannot run 64-bit apps.
armeabi-v7a This ABI is for 32-bit ARM-based CPUs.
Many modern Android devices (i.e. Nexus 5x) have AArch64 processors with arm64-v8a instruction set. Both - armeabi and armeabi-v7a - libraries run fine on these modern devices. Therefore, we can assume the answer to your question to be 'YES'.
See this for a breakdown of ABI management on Android: https://developer.android.com/ndk/guides/abis.html
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