How to build for Android #24

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opened 2019-06-17 06:21:46 -05:00 by z3ntu · 6 comments

z3ntu commented

2019-06-17 06:21:46 -05:00

(Migrated from github.com)

$ ~/Android/Sdk/ndk-bundle/ndk-build
Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-16.    
/mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:672: Android NDK: Module hidapi depends on undefined modules: usb1.0    
/mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:685: *** Android NDK: Aborting (set APP_ALLOW_MISSING_DEPS=true to allow missing dependencies)    .  Stop.

$ env APP_ALLOW_MISSING_DEPS=true ~/Android/Sdk/ndk-bundle/ndk-build
Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-16.    
/mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:672: Android NDK: Module hidapi depends on undefined modules: usb1.0    
/mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:672: Android NDK: Module hidapi depends on undefined modules: usb1.0    
/mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:672: Android NDK: Module hidapi depends on undefined modules: usb1.0    
/mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:672: Android NDK: Module hidapi depends on undefined modules: usb1.0    
[arm64-v8a] Compile        : hidapi <= hid.c
/home/luca/Dev/hidapi/android/jni/../../libusb/hid.c:47:10: fatal error: 'libusb.h' file not found
#include <libusb.h>
         ^~~~~~~~~~
1 error generated.
make: *** [/home/luca/Dev/hidapi/android/obj/local/arm64-v8a/objs/hidapi/__/__/libusb/hid.o] Error 1

With the following modifications to the Android.mk file, the build succeeds (using ~/Android/Sdk/ndk-bundle/ndk-build):

diff --git a/android/jni/Android.mk b/android/jni/Android.mk
index 527b43f..32e3442 100644
--- a/android/jni/Android.mk
+++ b/android/jni/Android.mk
@@ -1,8 +1,16 @@
-LOCAL_PATH:= $(call my-dir)
+MY_LOCAL_PATH:= $(call my-dir)
+
+LOCAL_PATH := $(MY_LOCAL_PATH)
 
 HIDAPI_ROOT_REL:= ../..
 HIDAPI_ROOT_ABS:= $(LOCAL_PATH)/../..
 
+include /tmp/libusb/android/jni/libusb.mk
+
+# hidapi
+
+LOCAL_PATH := $(MY_LOCAL_PATH)
+
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES := \

[armeabi-v7a] Install        : libhidapi.so => libs/armeabi-v7a/libhidapi.so

``` $ ~/Android/Sdk/ndk-bundle/ndk-build Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-16. /mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:672: Android NDK: Module hidapi depends on undefined modules: usb1.0 /mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:685: *** Android NDK: Aborting (set APP_ALLOW_MISSING_DEPS=true to allow missing dependencies) . Stop. ``` ``` $ env APP_ALLOW_MISSING_DEPS=true ~/Android/Sdk/ndk-bundle/ndk-build Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-16. /mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:672: Android NDK: Module hidapi depends on undefined modules: usb1.0 /mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:672: Android NDK: Module hidapi depends on undefined modules: usb1.0 /mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:672: Android NDK: Module hidapi depends on undefined modules: usb1.0 /mnt/hdd/Android/Sdk/ndk-bundle/build/core/build-binary.mk:672: Android NDK: Module hidapi depends on undefined modules: usb1.0 [arm64-v8a] Compile : hidapi <= hid.c /home/luca/Dev/hidapi/android/jni/../../libusb/hid.c:47:10: fatal error: 'libusb.h' file not found #include <libusb.h> ^~~~~~~~~~ 1 error generated. make: *** [/home/luca/Dev/hidapi/android/obj/local/arm64-v8a/objs/hidapi/__/__/libusb/hid.o] Error 1 ``` With the following modifications to the Android.mk file, the build succeeds (using `~/Android/Sdk/ndk-bundle/ndk-build`): ```diff diff --git a/android/jni/Android.mk b/android/jni/Android.mk index 527b43f..32e3442 100644 --- a/android/jni/Android.mk +++ b/android/jni/Android.mk @@ -1,8 +1,16 @@ -LOCAL_PATH:= $(call my-dir) +MY_LOCAL_PATH:= $(call my-dir) + +LOCAL_PATH := $(MY_LOCAL_PATH) HIDAPI_ROOT_REL:= ../.. HIDAPI_ROOT_ABS:= $(LOCAL_PATH)/../.. +include /tmp/libusb/android/jni/libusb.mk + +# hidapi + +LOCAL_PATH := $(MY_LOCAL_PATH) + include $(CLEAR_VARS) LOCAL_SRC_FILES := \ ``` ``` [armeabi-v7a] Install : libhidapi.so => libs/armeabi-v7a/libhidapi.so ``` See also https://developer.android.com/ndk/guides/android_mk#my-dir

👍 1

Youw commented

2019-06-18 04:45:49 -05:00

(Migrated from github.com)

include /tmp/libusb/android/jni/libusb.mk

I'm not familiar with .mk and Android build system, but I'm almost sure, that there has to be a better way specifying dependency, instead of hard-coding it.

> `include /tmp/libusb/android/jni/libusb.mk` I'm not familiar with `.mk` and Android build system, but I'm almost sure, that there has to be a better way specifying dependency, instead of hard-coding it.

cnlohr commented

2019-08-23 04:02:57 -05:00

(Migrated from github.com)

I am struggling with the same issue and a complete dirth of any information surrounding linking jni's to jni's on the internet at all. Nothing I do seems to let hidapi find libusb1.0. I perpetually see Android NDK: Module hidapi depends on undefined modules: usb1.0 . If anyone can shed light on the "proper" way to build the Android NDK module, please let me know!

P.S. THANK YOU SO MUCH FOR POSTING THIS! Though a bit kludgy, your solution works!

👍 1

TheBricktop commented

2019-09-14 06:07:53 -05:00

(Migrated from github.com)

thanks for posting this, it should be added to master.

Youw commented

2019-09-14 07:15:04 -05:00

(Migrated from github.com)

Again, hard-coding full system-specific paths is definitely not something we should have in master.
I'll have Android project to play soon, and will try to find elegant solution.

Again, hard-coding full system-specific paths is definitely not something we should have in master. I'll have Android project to play soon, and will try to find elegant solution.

Ghostbird commented

2021-11-24 15:01:16 -06:00

(Migrated from github.com)

Because I didn't really understand this fully at first, I worked it out in a script

The point that I entirely missed was that I had to clone libusb/libusb too and point to its Android.mk file.
Note: The script does everything. It also clones this repository, which is more than you need if you already have this cloned.

Because I didn't really understand this fully at first, I worked it out in [a script](https://gist.github.com/Ghostbird/566fbf92000b615934c0af8c6069ec94) The point that I entirely missed was that I had to clone [libusb/libusb](https://github.com/libusb/libusb) too and point to its `Android.mk` file. Note: The script does everything. It also clones _this_ repository, which is more than you need if you already have this cloned.

Youw commented

2023-03-12 08:26:38 -05:00

(Migrated from github.com)

At this point I think it should be enough to say that CMake build works perfectly fine on Android (I'm using it in my personal projects).

For that two things needed:

General CMake+Android instruction;
libusb for Android build.

As for Android.mk present in the repo - time to deprecated it.
Those who really need it - would know how to use it.
All others should probably use CMake build. Gradle (as native build tool for Android) supports CMake too.

At this point I think it should be enough to say that CMake build works perfectly fine on Android (I'm using it in my personal projects). For that two things needed: 1) General CMake+Android [instruction](https://developer.android.com/ndk/guides/cmake); 2) libusb for Android [build](https://github.com/libusb/libusb/blob/master/android/README). As for `Android.mk` present in the repo - time to deprecated it. Those who really need it - would know how to use it. All others should probably use CMake build. Gradle (as native build tool for Android) supports CMake too.

👍 1