android JNI under the C calling party SO question

Requirements Description:
a third-party so existing file (for example: libXXX.so), a detailed interface documentation, you can directly call android, but now need to re-encapsulation layer in C, C calling third parties to write their own libXXX . so, and then compiled into their own so files, android in so files and then call your own.
question:
1.C how to call libXXX.so?
2.Android.mk document how to write?

detailed code invitations, thank you!
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all Android.mk on top of the code, C code with Andrews Andrews does not matter, it is the basic C programming
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a detailed code do? Best Android.mk with C calling have.  

with C calling party so

 void * handle;
int (* call_method) (void);


handle = dlopen (so_path, RTLD_LAZY);


/ / Function pointer 

call_method = dlsym (handle, "method_name (function name called method)"); 

------ Solution --------- -----------------------------------
this trouble? Detailed interface documentation, you can directly call android
lib should have provided the header files it directly in android.mk inside the header files and lib join in.
Then in your own code # include the header file directly call the appropriate interface on it.

If you do not have to use dlopen dlsym header file
however. so you can directly copy files to / libs / armeabi / below
The code then use absolute paths dlopen ("/ data / data / lib / libxxx.so)
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reference examples:
Android.mk:
LOCAL_PATH: = $ (call my-dir)


include $ (CLEAR_VARS)
LOCAL_MODULE: = hello-world
LOCAL_SRC_FILES: = hello-world.c
LOCAL_SHARED_LIBRARIES: = hello-jni
LOCAL_LDLIBS + =-llog
include $ (BUILD_SHARED_LIBRARY)

corresponding c code:
# include "string.h"
# include "jni.h"
# include "dlfcn.h"
# include

void * filehandle = NULL;
jint (* getResult) (JNIEnv *, jobject, jint, jint) = NULL;

jint JNICALL Java_com_example_hellojni_HelloAct_getInt (JNIEnv * env,
jobject thiz) {
jint result = 0;
filehandle = dlopen ("libhello-jni.so", RTLD_LAZY);
if (filehandle) {
getResult = (jint (*) (JNIEnv *, jobject, jint, jint)) dlsym (filehandle,
"Java_com_example_hellojni_HelloJni_add");
if (getResult)
result = getResult (env, thiz, 3, 10);
dlclose (filehandle);
filehandle = NULL;
}
return result + 1;
}
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1. I remember it should be dlopen
2.LOCAL_SHARED_LIBRARIES added dynamic library references

purposes only ....

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I saw the inside of hal layer is obtained by dlopen to open dynamic library
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LOCAL_PATH: = $ (call my-dir)

# # XXX
#
include $ (CLEAR_VARS)

LOCAL_MODULE: = XXX
LOCAL_SRC_FILES: = XXX.c

LOCAL_CFLAGS: = -Iyour_lib_name/include
LOCAL_LDFLAGS + = -Lyour_lib_name/lib

LOCAL_LDLIBS: =-lyour_lib_name

include $ (BUILD_SHARED_LIBRARY)

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a detailed code do? Best Android.mk with C calling have.
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This is very true. . . Oh
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that so that you do not know to write their own thing api not tune it
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a detailed code do? Best Android.mk with C calling have.          
  
with C calling party so   
  

 void * handle;
int (* call_method) (void);


handle = dlopen (so_path, RTLD_LAZY);


/ / Function pointer 

call_method = dlsym (handle, "method_name (function name called method)"); 
 


 Thank you! I try. 
 ------ For reference only -------------------------------------- - 
 C can call in C + +. so? 
 ------ For reference only -------------------------------------- - 
 C calls so the file will not

 But Android.mk file

 # Copyright (C) 2009 The Android Open Source Project

 #

 # Licensed under the Apache License, Version 2.0 (the "License");

 # you may not use this file except in compliance with the License.

 # You may obtain a copy of the License at

 #

 # http://www.apache.org/licenses/LICENSE-2.0

 #

 # Unless required by applicable law or agreed to in writing, software

 # distributed under the License is distributed on an "AS IS" BASIS,

 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 # See the License for the specific language governing permissions and

 # limitations under the License.

 #

 LOCAL_PATH: = $ (call my-dir)



 include $ (CLEAR_VARS)



 LOCAL_MODULE: = gpio --- "own name to define the so

 LOCAL_SRC_FILES: = gpio.c --- "your C file names



 LOCAL_LDLIBS: =-llog

 include $ (BUILD_SHARED_LIBRARY)