调用org.cocos2dx.cpp.AppActivity

AppActivity是位于proj.Android/src下，是开发者类(即开发者自定义的类)，继承自org.cocos2dx.lib.Cocos2dxActivity，它没有添加任何代码，纯粹是一个Cocos2dxActivity，也是一个Activity。

AppActivity被调用是因为被配置在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 of our .so -->             <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>

加载libcocos2dcpp.so

libcocos2dcpp.so在编译后生成到proj.android/libs/armeabi下，从上面代码中可以看到android:value=”cocos2dcpp”这行配置内容，它指示了so的名字。

在AppActivity中加载so的代码如下：

@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) {                  // ERROR             }         } catch (PackageManager.NameNotFoundException e) {              // ERROR         }         sContext = this;         this.mHandler = new Cocos2dxHandler(this);         this.init();         Cocos2dxHelper.init(this);     }

调用cocos_android_app_init

proj.android/jni/hellocpp/main.cpp中的cocos_android_app_init函数被调用。

我们看看this.init();后续代码片段：

public void init() {         ...         this.mGLSurfaceView.setCocos2dxRenderer(new Cocos2dxRenderer()); ...     } @Override     public void onSurfaceCreated(final GL10 pGL10, final EGLConfig pEGLConfig) {         Cocos2dxRenderer.nativeInit(this.mScreenWidth, this.mScreenHeight);         this.mLastTickInNanoSeconds = System.nanoTime();     }

到现在前面都是Java代码，上段中的Cocos2dxRenderer.nativeInit(this.mScreenWidth, this.mScreenHeight);是一句jni调用，java调用c/c++代码。

其代码在cocos2d/cocos/2d/platform/android/javaactivity.cpp中，如下：

void Java_org_cocos2dx_lib_Cocos2dxRenderer_nativeInit(JNIEnv*  env, jobject thiz, jint w, jint h) {     auto director = cocos2d::Director::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::DrawPrimitives::init();         cocos2d::VolatileTextureMgr::reloadAllTextures();         cocos2d::EventCustom foregroundEvent(EVENT_COME_TO_FOREGROUND);         director->getEventDispatcher()->dispatchEvent(&foregroundEvent);         director->setGLDefaultValues();     } }

jintArray Java_org_cocos2dx_lib_Cocos2dxActivity_getGLContextAttrs(JNIEnv*  env, jobject thiz)

{

    cocos_android_app_init(env, thiz);

    cocos2d::Application::getInstance()->initGLContextAttrs(); 

    GLContextAttrs _glContextAttrs = GLView::getGLContextAttrs();

    

    int tmp[6] = {_glContextAttrs.redBits, _glContextAttrs.greenBits, _glContextAttrs.blueBits,

                           _glContextAttrs.alphaBits, _glContextAttrs.depthBits, _glContextAttrs.stencilBits};

 

 

    jintArray glContextAttrsJava = env->NewIntArray(6);

        env->SetIntArrayRegion(glContextAttrsJava, 0, 6, tmp); 

    

    return glContextAttrsJava;

}

我们看到了cocos_android_app_init(env, thiz);这句，这就和main.cpp中的cocos_android_app_init连接上了。

创建AppDelegate

cocos_android_app_init中创建了AppDelegate，后面的事就交给cocos2d-x引擎吧

void cocos_android_app_init (JNIEnv* env, jobject thiz) {     LOGD("cocos_android_app_init");     AppDelegate *pAppDelegate = new AppDelegate(); }

转载于:https://www.cnblogs.com/zhujiulunjian/p/6795236.html

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