11.cocos2dx2.2 some of the problems and solutions encountered by using JNI technology to invoke some of the methods inside the jar package.

<span style= "font-family:arial, Helvetica, Sans-serif;" > Step One: Import the JniHelper.h header file. </span>

#if (Cc_target_platform = = cc_platform_android) #include "JniHelper.h" #endif;

at this time will encounter JniHelper.h header file can not be found problems, need to add additional include folder to solve this problem. The detailed procedure is as follows: Right-click the project---->c/c++----> General----> Attach folder----> Join JniHelper.h path, eg:e:\ Android development workspace \ Cocos2d-x-2.2\cocos2dx\platform\android\jni.
At this point, you may also encounter problems found jni.h and jni_md.h, the solution is to find jni.h under%java_home%/include/,%java_home%/include/win32/found under Jni_md.h, copy to " Visual Studio Folder/vc/include/"To resolve this issue.

Step Two: Write code that calls the Java-side method.

<span style= "FONT-SIZE:18PX;" >void Helloworld::fun () {#if (Cc_target_platform = = cc_platform_android) jnimethodinfo Methodinfo;bool isHave = Jnihelper::getstaticmethodinfo (MethodInfo, "Org/cocos2dx/hellocpp/hellocpp", "Showad", "() V"), if (Ishave) { Methodinfo.env->callstaticvoidmethod (Methodinfo.classid,methodinfo.methodid);} #endif}</span>

Be sure to add the platform inference statement. Otherwise, the following bug will appear. (Please refer to the relevant documentation for details on how to call)

<span style= "FONT-SIZE:18PX;" > Errors    2 error    LNK2019: unresolved external symbol "__declspec (dllimport) public:static bool __cdecl  cocos2d::jnihelper:: Getstaticmethodinfo (struct cocos2d::jnimethodinfo_ &,char const *,char Const *,CHAR const *) "(__imp_? [Email protected]@[email protected]@[email protected]@[email protected]), the symbol in the function "Public:void __thiscall HelloWorld:: Fun (void) "([email protected]@ @QAEXXZ) is referenced    e:\ android development Workspace \cocos2d-x-2.2\projects\jni2\proj.win32\ Helloworldscene.obj    hellocpp</span>

Step three: porting it to the Android platform, you will be prompted to log.h:no such file or directory in the CCPlatformDefine.h files, that is log.h not found.
How to resolve:1. Change the android.mk file configuration, add the following statements such as Local_ldlibs + =-l$ (sysroot)/usr/lib-llog2. Change the CCPlatformDefine.h filestare out the # include "Log.h" and add # include "ALog.h". 3. Create a new ALog.h file, write the following, and place it in the same folder as the CCPlatformDefine.h.

<span style= "FONT-SIZE:18PX;" > #pragma once    #include <android/log.h>    #define LOG_TAG "debug Log"  #define Logi (FMT, args ...) __ Android_log_print (Android_log_info, Log_tag, FMT, # #args)  #define LOGD (FMT, args ...) __android_log_print (ANDROID _log_debug, Log_tag, FMT, # #args)  #define LOGE (FMT, args ...) __android_log_print (Android_log_error, Log_tag, FMT, # #args) </span>

step four: After the third step, and then compile the execution, but also to mention the demo sample such as the following error.

<span style= "FONT-SIZE:18PX;" > "e:\\ Thunderbolt download \\android-ndk-r9-windows-x86\\android-ndk-r9\\ndk-build.cmd" Android ndk:warning:e:\ development workspace \ Cocos2d-x-2.2\/cocos2dx/android.mk:cocos2dx_static:local_ldlibs is all ignored for static libraries    "Compile+ + thumb:cocos2dcpp_shared <= helloworldscene.cppjni/. /.. /classes/helloworldscene.cpp:3:23:fatal error:jnihelper.h:no such file or directorycompilation terminated.make: * * [o BJ/LOCAL/ARMEABI/OBJS/COCOS2DCPP_SHARED/__/__/CLASSES/HELLOWORLDSCENE.O] Error 1</span>

The JniHelper.h file cannot be found, and the solution is as follows.

<span style= "FONT-SIZE:18PX;" >local_path: = $ (call My-dir) include $ (clear_vars) Local_module: = Cocos2dcpp_sharedlocal_module_filename: = Libcocos2dcpplocal_src_files: = Hellocpp/main.cpp. /.. /classes/appdelegate.cpp. /.. /classes/helloworldscene.cpplocal_c_includes: = $ (Local_path)/. /.. /classes e:\ Android Development Workspace \cocos2d-x-2.2\cocos2dx\platform\android\jnilocal_whole_static_librar IES + = cocos2dx_staticlocal_whole_static_libraries + = cocosdenshion_staticlocal_whole_static_libraries + = box2d_ Staticlocal_whole_static_libraries + = chipmunk_staticlocal_whole_static_libraries + cocos_extension_staticLOCAL_ Ldlibs + =-l$ (sysroot)/usr/lib-lloginclude $ (build_shared_library) $ (call IMPORT-MODULE,COCOS2DX) $ (call Import-module,cocos2dx/platform/third_party/android/prebuilt/libcurl) $ (Call import-module,cocosdenshion/android ) $ (call Import-module,extensions) $ (call import-module,external/box2d) $ (Call IMPORT-MODULE,EXTERNAL/CHIPMUNK) </span> 

is in local_c_includes: = $ (Local_path)/. /.. /classes\ append the path to the JniHelper.h file followed by the compiler to compile the local file. Some basic knowledge of the relevant android.mk, see http://www.himigame.com/lua-game/1388.htmlIf you are still prompted to find the header fileThe path to the first step in the CPP file of the project is changed to the following#if (Cc_target_platform = = cc_platform_android)
#include "Platform/android/jni/jnihelper.h"
#endif
Step Five: Write a Java method for C + + calls, assuming that it is a method inside a third-party jar, it is recommended to use handler to trigger it to execute in the UI thread, otherwise it may be wrong.

<span style= "FONT-SIZE:18PX;" >package Org.cocos2dx.hellocpp;import Org.cocos2dx.lib.cocos2dxactivity;import Org.cocos2dx.lib.cocos2dxglsurfaceview;import Android.content.context;import Android.os.Bundle;import Android.os.handler;import android.os.message;import Android.util.log;import Com.manage.la;public class HelloCpp Extends Cocos2dxactivity {/** * Saves the current activity instance, static variable */private statics Context mactivity = null;protected void OnCreate (Bun Dle savedinstancestate) {super.oncreate (savedinstancestate); mactivity = this; LA.INITSDK (mactivity, "1005020"); LOG.I ("Hellocpp", "onCreate");} Public Cocos2dxglsurfaceview Oncreateview () {Cocos2dxglsurfaceview Glsurfaceview = new Cocos2dxglsurfaceview (this);//   Hellocpp should create stencil bufferglsurfaceview.seteglconfigchooser (5, 6, 5, 0, +, 8); return Glsurfaceview;} /** * Display ad */public static void Showad () {mhandler.sendemptymessage (0); LOG.I ("Hellocpp", "Showad");} public static Handler Mhandler = new Handler () {@Overridepublic void HandlemeSsage (Message msg) {//TODO auto-generated Method Stubsuper.handlemessage (msg); switch (msg.what) {case 0:la.showad1 ( mactivity); break;}}; static {system.loadlibrary ("Cocos2dcpp");}} </span>

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11.cocos2dx2.2 some of the problems and solutions encountered by using JNI technology to invoke some of the methods inside the jar package.