A brief analysis on the starting call process of Cocos2d-x Android application

Call Org.cocos2dx.cpp.AppActivity

Appactivity is a developer class (i.e. developer-defined class) located under Proj.android/src. It inherits from Org.cocos2dx.lib.Cocos2dxActivity, and it does not add any code after the project is built, purely a cocos2dxactivity and an activity.

Appactivity is called because it is configured in Androidmanifest.xml

<application android:label= "@string/app_name"                   android:icon= "@drawable/icon" >         <activity android:name= "Org.cocos2dx.cpp.AppActivity"                    android:label= "@string/app_name"                    android:screenorientation= " Landscape "                   Android:theme= "@android: Style/theme.notitlebar.fullscreen"                    android:configchanges= "Orientation" >             <!--tell nativeactivity the name----             <meta-data android:name= "Android.app.lib_name"                          android:value= "Cocos2dcpp"/>            < intent-filter>                <action android:name= "Android.intent.action.MAIN"/>                 <category android:name= "Android.intent.category.LAUNCHER"/>             </intent-filter>         </activity>    </application>

Load the libcocos2dcpp.so (or put the library under Proj.android/libs)

Libcocos2dcpp.so after compiling to Proj.android/libs/armeabi, from the above code can see the android:value= "Cocos2dcpp" line configuration content, it indicates the name of so.

The code to load so in Appactivity is as follows:

@Override     protected void onCreate (Final Bundle savedinstancestate) {        super.oncreate (savedinstancestate);        try {             applicationinfo ai = Getpackagemanager (). Getapplicationinfo (Getpackagename (), Packagemanager.get_meta_data);            bundle Bundle = ai.metadata;             try {                 string libname = bundle.getstring ("Android.app.lib_name");                 system.loadlibrary (libname);             } catch (Exception e) {              & nbsp  //error            }        } catch (Packagemanager.namenotfoundexception e) {              //error        }        scontext = this;         this.mhandler = new Cocos2dxhandler (this);        this.init ();        cocos2dxhelper.init (this);    }

Call Cocos_android_app_init

The Cocos_android_app_init function in Proj.android/jni/hellocpp/main.cpp is called.

Let's look at This.init (); Follow code snippet:

public void init () {... this.mGLSurfaceView.setCocos2dxRenderer (new Cocos2dxrenderer ());        ...    }

@Override public void onsurfacecreated (final GL10 pGL10, final EGLConfig peglconfig) {Cocos2dxrenderer.nativein        It (This.mscreenwidth, this.mscreenheight);    This.mlasttickinnanoseconds = System.nanotime (); }

Until now, the Java Code, Cocos2dxrenderer.nativeinit (This.mscreenwidth, This.mscreenheight) in the previous paragraph, is a JNI call, and Java calls C + + code.

Its code is in Cocos2d/cocos/2d/platform/android/javaactivity.cpp, as follows:

void Java_org_cocos2dx_lib_cocos2dxrenderer_nativeinit (jnienv*  env, Jobject thiz, Jint W, Jint h) {  & nbsp Auto Director = Cocos2d::D irector::getinstance ();    Auto Glview = Director->getopenglview ();     if (!glview)     {        Glview = Cocos2d::glview:: Create ("Android app");        Glview->setframesize (W, h);         Director->setopenglview (glview);        Cocos_ Android_app_init (env, thiz);        cocos2d::application::getinstance () Run ();   }    else    {        Cocos2d::gl::invalidatestatecache ();        Cocos2d::ShaderCache:: GetInstance ()->reloaddefaultshaders ();        cocos2d::D rawpriMitives::init ();        cocos2d::volatiletexturemgr::reloadalltextures ();         cocos2d::eventcustom foregroundevent (event_come_to_foreground);         Director->geteventdispatcher (->dispatchevent) (&foregroundevent);         director->setgldefaultvalues ();   }}

We see Cocos_android_app_init (env, Thiz), which is connected to the Cocos_android_app_init in Main.cpp.

Create Appdelegate

The appdelegate is created in Cocos_android_app_init, and the Cocos2d-x engine is the thing behind it.

void Cocos_android_app_init (jnienv* env, Jobject thiz) {logd ("cocos_android_app_init"); Appdelegate *pappdelegate = new Appdelegate ();}

A brief analysis on the starting call process of Cocos2d-x Android application