NDK动态库的调用(一)
NDK动态库的调用（一）
NDK so mk;
so2so
so
A.
eoe.Java :Java
test01.c so libtest.so libtest.so libtutorial.so.tutorial01.c tutorial02.c tutorial02.h libtutorial.so
B. mk java
java C/C++
1.packageeoe.example.test;
2.
3.importandroid.R.integer;
4.importandroid.app.Activity;
5.importandroid.widget.TextView;
6.importandroid.os.Bundle;
7.
8.publicclasstest01extendsActivity{
9.
10./**Calledwhentheactivityisfirstcreated.*/
11.@Override
12.publicvoidonCreate(BundlesavedInstanceState){
13.
14.super.onCreate(savedInstanceState);
15.TextViewtv=newTextView(this);
16.inta=getinformation();
17.Stringlls=a+"";
https://www.wendangku.net/doc/c514329014.html,.setText(lls);
19.setContentView(tv);
20.}
21.
22.publicnativeintgetinformation();
23.
24.static{
25.System.loadLibrary("test");
26.}
27.}
28.Android.mkLOCAL_PATH:=$(callmy-dir)
29.#
30.include$(CLEAR_VARS)
31.#
32.LOCAL_MODULE:=tutorial
33.#
34.LOCAL_SRC_FILES:=tutorial01.ctutorial02.c
35.#
36.include$(BUILD_SHARED_LIBRARY)
37.#libtutorial.so
38.include$(CLEAR_VARS)
39.#
40.LOCAL_MODULE:=test
41.#
42.LOCAL_SRC_FILES:=test01.c
43.#
44.LOCAL_LDLIBS:=-ldl-llog
45.#libtest.so libdl.so:liblog.so system/lib
46.include$(BUILD_SHARED_LIBRARY)
47.#
48.test01.c
49.#include
50.#include
51.#include
52.#include
53.#include
54.#defineLOG_TAG"libgl2jni"
55.#defineLOGI(...)__android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
56.#defineLOGE(...)__android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
57.
58.//externintgetinformation();
59.jintJava_com_example_test_test01_getinformation(JNIEnv*env,jobjectthiz){
60.//getinformation();??
thr.sofilewillloadtothesdcardwiththefolderdata/data/com.example.test/lib/
61.void*filehandle=dlopen("/data/data/com.example.test/lib/libtutorial.so",RTLD_LAZY);
62.intll=-1;
63.if(filehandle){
64.LOGI("opensosuccess!");
65.int(*getinformation)();
66.getinformation=dlsym(filehandle,"getinformation");
67.if(getinformation){
68.LOGI("callfunctiongetinformationOK!");
69.ll=getinformation();
70.}else{
71.ll=-3;
72.LOGE("callfunctiongetinformation!ERROR!");
73.}
74.LOGI("returnvalue=%d",ll);
75.dlclose(filehandle);
76.filehandle=0;
77.}else{
78.ll=-2;
79.LOGE("opensoERROR!");
80.}
81.returnll;
82.}