linux - How do I build a native (command line) executable to run on Android?

Question

I've had success with building an Android app (GUI) that uses a native (JNI) library.

However, now I would like to create an executable that runs from the command line (root privileges) and does not use a GUI at all. How do I build something like that?

Answer 1

As of NDK r8d, this can be solved in a much simpler way.

1. Create a project with the following directory hierarchy:

   project/
       jni/
           Android.mk
           Application.mk
           *.c, *.cpp, *.h, etc.
   

2. Fill in Android.mk with the following content. The most important thing is the last line. Check the NDK doc for the meaning of the other variables.

   LOCAL_PATH := $(call my-dir)
   
   include $(CLEAR_VARS)
   
   LOCAL_MODULE := name-of-your-executable
   LOCAL_SRC_FILES := a.cpp b.cpp c.cpp etc.cpp
   LOCAL_CPPFLAGS := -std=gnu++0x -Wall -fPIE         # whatever g++ flags you like
   LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog -fPIE -pie   # whatever ld flags you like
   
   include $(BUILD_EXECUTABLE)    # <-- Use this to build an executable.
   

3. Go to the project/ directory, and simply type

   ndk-build
   

   The result will be placed in project/libs/<arch>/name-of-your-executable.