Building Android NDK app with static library for distribution

Question

I have an Android project, featuring some native code, which use a static library for some Poco-library functions. I have currently linked in the arm7 build of the static library in the make files below. Now if i want to distribute this app on google play, for portatbility i need to include other architectures in the apk to. How do i include for example the static libPocofoundation.a for arm6 and the static libPocoFoundation.a for arm7 to the shared library in the apk?

include $(CLEAR_VARS)
LOCAL_ARM_MODE := arm
LOCAL_MODULE := PocoFoundation
LOCAL_SRC_FILES := Poco/libPocoFoundation.a   #<- How do i set this conditional-
#                                                 or add multiple architectures?
LOCAL_EXPORT_C_INCLUDES := /Users/poco-1.5.1-all/Foundation/include
LOCAL_EXPORT_CFLAGS := -DFOO=1 -fpermissive
LOCAL_EXPORT_LDLIBS := -llog
include $(PREBUILT_STATIC_LIBRARY)

Android.mk

LOCAL_PATH := $(call my-dir)
ROOT_PATH := $(LOCAL_PATH)
include $(call all-subdir-makefiles)
include $(CLEAR_VARS)
LOCAL_PATH = $(ROOT_PATH)

include $(CLEAR_VARS)
#LOCAL_MODULE_TAGS    := eng
LOCAL_ARM_MODE       := arm
LOCAL_MODULE    := JsonPoco # Your own library.
LOCAL_SRC_FILES := JsonPoco.cpp \


 # Your own library source.
LOCAL_WHOLE_STATIC_LIBRARIES := PocoFoundation \
PocoJSON
LOCAL_LDLIBS     := -llog
LOCAL_CFLAGS     := -DPOCO_ANDROID -DPOCO_NO_FPENVIRONMENT -DPOCO_NO_WSTRING -DPOCO_NO_SHAREDMEMORY
LOCAL_CPPFLAGS   := -frtti -fexceptions 
include $(BUILD_SHARED_LIBRARY)

mbrenon · Accepted Answer · 2013-03-27 09:07:31Z

4

If I understand well, you want to include different builds of this static library, located in different paths.

As Rajitha said, the first step to support multiple platforms is to mention them in the Application.mk. For example, to support ARMv5/6 and ARMv7:

APP_ABI := armeabi armeabi-v7a

Then in your Android.mk, you'll want to change the path you use for the static library depending on the platform currently being built:

ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
    LOCAL_SRC_FILES := /path/to/armv-7/libPocofoundation.a
else
    LOCAL_SRC_FILES := /path/to/armv-6/libPocofoundation.a
endif

You can do this if/else condition on more architectures if you want to support x86 for example.

answered Mar 27, 2013 at 9:07

mbrenon

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3 Comments

David Karlsson Over a year ago

It seems that eclipse marks all of my imports as armeabi: (is this a problem?) Clean: PocoFoundationArm [armeabi] Clean: PocoFoundationArm7 [armeabi] Clean: PocoJSONArm [armeabi] Clean: PocoJSONArm7 [armeabi]

mbrenon Over a year ago

I guess there's something wrong indeed: I checked the output of my own ndk-build clean and each library is cleaned only under its own architecture. Maybe it's a known issue in Eclipse? (I personnaly use the ndk-build command line tool directly, not Eclipse).

David Karlsson Over a year ago

It seems eclipse ignores my armeabi-libraries but use only arm7: /Applications/adt-bundle-mac-x86_64/android-ndk-r8d/build/core/build-binary.mk:419: warning: overriding commands for target `obj/local/armeabi/libPocoFoundation.a' Prebuilt : libPocoFoundation.a <= jni/Poco/arm7/

Rajitha Siriwardena · Accepted Answer · 2013-03-27 08:41:34Z

0

Modify the APP_ABI in your Application.mk to

APP_ABI := all

answered Mar 27, 2013 at 8:41

Rajitha Siriwardena

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2 Comments

David Karlsson Over a year ago

Paths for the other .a libraries is added how?

yano Over a year ago

probably excessive for this case, if they don't need x86 or other future supported arch's

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