Problem: the installation of install depends on the APK with so library, so it can’t load so normally. Error: not found libc + +. So
for example: system. Loadlibrary (“inittest”);

analysis:

on Android/prebuilds/tools/GCC SDK, run the following command:
readelf – DW libinittest. So
to view the dynamic dependency Library of libinittest. So. Since relying on libc + +. So Android n, Google has contracted the dependent permissions of so library. Only the application under system/APP system/priv app can be relied on. Some so libraries cannot be loaded by the installation application under data/APP
the following/system/etc/public.libraries.txt is the white list of dynamically dependent libraries. Libc + +. So is not among them

libandroid.so
libaaudio.so
libamidi.so
libbinder_ndk.so
libc.so
libcamera2ndk.so
libdl.so
libEGL.so
libGLESv1_CM.so
libGLESv2.so
libGLESv3.so
libicui18n.so
libicuuc.so
libjnigraphics.so
liblog.so
libmediandk.so
libm.so
libnativewindow.so
libneuralnetworks.so
libOpenMAXAL.so
libOpenSLES.so
libRS.so
libstdc++.so
libsync.so
libvulkan.so
libwebviewchromium_plat_support.so
libz.so

Scheme 1:
add libc + +. So to the white list

Scheme 2:
add the following configuration in the source code android.mk of libinittest.so:

LOCAL_NDK_STL_VARIANT := c++_static
LOCAL_SDK_VERSION := 8

Scheme 3:
copy libc + +. So to the same level directory of libinittest.so in your app to generate APK.