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Rules::The AsyncTask instance must be created in UI thread. .execute must be invoked on the UI thread.Never call  objMyTask.onPreExecute(), objMyTask.doInBackground(), objMyTask.onProgressUpdate(),  objMyTask.onPostExecute manually.The AsyncTask can be executed only once (an exception will be thrown if a second execution is attempted.)AsyncTask have Four Main Method... onPreExecute()  doInBackground() onProgressUpdate() onPostExecute()  onPreExecute-This method is called first when you start AsyncTask using objAsync.execute().And mostly this method is use for initializing dialog(ProgressDialog,CustomDialog) and showing. doInBackground-The main purpose of AsyncTask is accomplished by this method.Any non-UI thread process is running in this method.Such as Rss Feed Reader,Image and video Uploading and Downloading.You cant handle your View in this method.Because this method is non-UI thread.While any background process is running if you want to handle UI therea are  onProgressUpdate method. after completion of process this method send result to OnPostExecute. onProgressUpdate-While backgrounding task is running ,you can handle your UI using this method .Such as status of downloading or uploading task.and this method is called from  doInBackground.Using publishProgress() you can call onProgressUpdate method to update UI while process is running. onPostExecute -This method is called after the background computation finishes.The result of background process in passed in this method as parameters.And now you can dismiss progress dialog ,to indicate that background task is completed. You can cancel AsyncTask using objAsyncTask.cancel().then you just check in doInBackground, if (isCancelled()) { break; } else {        //continue... } See this Image For more Clear.

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[实例简介]Open GL 入门级示例 [实例截图] [核心代码]package com.china.gltry;import javax.microedition.khronos.egl.EGL10;import javax.microedition.khronos.egl.EGL11;import javax.microedition.khronos.egl.EGLConfig;import javax.microedition.khronos.egl.EGLContext;import javax.microedition.khronos.egl.EGLDisplay;import javax.microedition.khronos.egl.EGLSurface;import javax.microedition.khronos.opengles.GL;import android.view.SurfaceHolder;/** * An EGL helper class. */public class EGLHelper{ public EGLHelper() { } /** * Initialize EGL for a given configuration spec. * @param configSpec */ public void start(int[] configSpec){ /* * Get an EGL instance */ mEgl = (EGL10) EGLContext.getEGL(); /* * Get to the default display. */ mEglDisplay = mEgl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY); /* * We can now initialize EGL for that display */ int[] version = new int[2]; mEgl.eglInitialize(mEglDisplay, version); EGLConfig[] configs = new EGLConfig[1]; int[] num_config = new int[1]; mEgl.eglChooseConfig(mEglDisplay, configSpec, configs, 1, num_config); mEglConfig = configs[0]; /* * Create an OpenGL ES context. This must be done only once, an * OpenGL context is a somewhat heavy object. */ mEglContext = mEgl.eglCreateContext(mEglDisplay, mEglConfig, EGL10.EGL_NO_CONTEXT, null); mEglSurface = null; } /* * Create and return an OpenGL surface */ public GL createSurface(SurfaceHolder holder) { /* * The window size has changed, so we need to create a new * surface. */ if (mEglSurface != null) { /* * Unbind and destroy the old EGL surface, if * there is one. */ mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT); mEgl.eglDestroySurface(mEglDisplay, mEglSurface); } /* * Create an EGL surface we can render into. */ mEglSurface = mEgl.eglCreateWindowSurface(mEglDisplay, mEglConfig, holder, null); /* * Before we can issue GL commands, we need to make sure * the context is current and bound to a surface. */ mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext); GL gl = mEglContext.getGL(); return gl; } /** * Display the current render surface. * @return false if the context has been lost. */ public boolean swap() { mEgl.eglSwapBuffers(mEglDisplay, mEglSurface); /* * Always check for EGL_CONTEXT_LOST, which means the context * and all associated data were lost (For instance because * the device went to sleep). We need to sleep until we * get a new surface. */ return mEgl.eglGetError() != EGL11.EGL_CONTEXT_LOST; } public void finish() { if (mEglSurface != null) { mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT); mEgl.eglDestroySurface(mEglDisplay, mEglSurface); mEglSurface = null; } if (mEglContext != null) { mEgl.eglDestroyContext(mEglDisplay, mEglContext); mEglContext = null; } if (mEglDisplay != null) { mEgl.eglTerminate(mEglDisplay); mEglDisplay = null; } } EGL10 mEgl; EGLDisplay mEglDisplay; EGLSurface mEglSurface; EGLConfig mEglConfig; EGLContext mEglContext;}