使用android源代码下的API

声明： 这个是 看到别人的代码，感觉不错，适合我这样的初学者，就加工了！

1，在android源代码的external目录下建立文件夹，如mkdir sno_opengl

2,在sno_opengl文件夹下，创建源代码，如tst_opengl.cpp和Android.mk
其中Android.mk的代码如下：

LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_SRC_FILES:= \       tst_opengl.cppLOCAL_SHARED_LIBRARIES := \    libutils\   libui \   libEGL \   libGLESv1_CM \libsurfaceflinger_client LOCAL_MODULE := sno_openglLOCAL_MODULE_TAGS:= optional  include $(BUILD_EXECUTABLE)

tst_poengl.cpp的源代码是：
（转自：http://blog.csdn.net/xiexh0921/article/category/1134272）

//android opengl es画三角形-native C实现  //Native C开发opengl，网上这方面的资料很少，研究了几天才弄出来，现在贴出来供交流，转载请注明Hello Xiexh#include <stdio.h>#include <unistd.h>#include <EGL/egl.h>#include <GLES/gl.h>#include <ui/FramebufferNativeWindow.h>#include <ui/EGLUtils.h>#include <ui/DisplayInfo.h> #include <surfaceflinger/SurfaceComposerClient.h>  using namespace android; int        mWidth;int        mHeight;EGLDisplay mDisplay;EGLDisplay mContext;EGLDisplay mSurface;sp<SurfaceControl>mFlingerSurfaceControl;sp<Surface> mFlingerSurface;  int initGraphics(){      //create the native surface      sp<SurfaceComposerClient>session = new SurfaceComposerClient();      DisplayInfo dinfo;      status_t status = session->getDisplayInfo(0, &dinfo);      if(status)           return-1;   sp<SurfaceControl> control = session->createSurface(           getpid(), 0, 400, 300, PIXEL_FORMAT_RGB_565);   session->openTransaction();   control->setLayer(0x40000000);   session->closeTransaction();    sp<Surface> s = control->getSurface();       //initialize opengl and egl      const EGLint attribs[] =       {                 EGL_DEPTH_SIZE,0,                 EGL_NONE      };      EGLint w, h, dummy;     // EGLintnum Configs;      EGLConfig config;      EGLSurface surface;      EGLContext context;       EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);       eglInitialize(display,0, 0);      EGLUtils::selectConfigForNativeWindow(display,attribs, s.get(), &config);      surface= eglCreateWindowSurface(display, config, s.get(), NULL);      context= eglCreateContext(display, config, NULL, NULL);      eglQuerySurface(display,surface, EGL_WIDTH, &w);      eglQuerySurface(display,surface, EGL_HEIGHT, &h);       if(eglMakeCurrent(display, surface, surface, context) == EGL_FALSE)           return NO_INIT;       mDisplay = display;      mContext = context;      mSurface = surface;      mWidth = w;      mHeight = h;      mFlingerSurfaceControl= control;      mFlingerSurface= s;       glViewport(0,0, mWidth, mHeight);      glMatrixMode(GL_PROJECTION);      glLoadIdentity();      glOrthof(0,mWidth, 0, mHeight, 0, 1);    return EGL_TRUE;} void draw() {      //printf("startdrawing...\n");   glColor4f(1,0,0,1);    const GLfloat vertices[3][2] = {       {100,  100},           {200, 100},           {100,200}   };    glEnableClientState(GL_VERTEX_ARRAY);   glVertexPointer(2, GL_FLOAT, 0, vertices);    glClearColor(0,0,0,0);   glClear(GL_COLOR_BUFFER_BIT);   glDrawArrays(GL_TRIANGLES, 0, 3);        eglSwapBuffers(mDisplay, mSurface);     } int main(int argc, char** argv) {      if(!initGraphics())      {           printf("Graphicsinitialization failed.\n");           return EXIT_FAILURE;      }      while(1){           draw();           usleep(100*1000);      }       //clearstatus      eglMakeCurrent(mDisplay,EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);      eglDestroyContext(mDisplay,mContext);      eglDestroySurface(mDisplay,mSurface);      mFlingerSurface.clear();      mFlingerSurfaceControl.clear();      eglTerminate(mDisplay);      return 0;}

3，在源代码目录下执行 make sno_opengl
4,可以./adb push 进虚拟机，然后./sno_opengl可以出来。