The AsyncTask class must be loaded on the UI thread. This is done automatically as of android.os.Build.VERSION_CODES#JELLY_BEAN. The task instance must be created on the UI thread. #execute must be invoked on the UI thread. Do not call #onPreExecute(), #onPostExecute, #doInBackground...
usingSystem;usingSystem.Web;usingSystem.Web.UI;usingSystem.Threading;namespaceSamples.AspNet.CS.Controls{publicclassSlowTask{privateString _taskprogress;privateAsyncTaskDelegate _dlgt;// Create delegate.protecteddelegatevoidAsyncTaskDelegate();publicStringGetAsyncTaskProgress(){return_taskprogress; }publicvoid...
template<typename InternalResultType> class TFutureState: public FFutureState { public: TFutureState(): FFutureState(){ } TFutureState(TUniqueFunction<void()>&& CompletionCallback) : FFutureState(MoveTemp(CompletionCallback)){ } const InternalResultType& GetResult() const { while (!IsComplete()...
How to use a static inner AsyncTask class To prevent leaks, you can make the the inner class static. The problem with that, though, is that you no longer have access to the Activity's UI views or member variables. You can pass in a reference to theContextbut then you run the same ...
AsyncTask是一种轻量级的异步任务类,可以很方便的在线程池中执行异步任务,并且将进度和结果传递给主线程。其底层由Thread+handler实现。 AsyncTask是一个抽象的泛型类,其类的声明如下: 代码语言:javascript 复制 publicabstractclassAsyncTask<Params,Progress,Result> ...
1publicclassMainActivityextendsAppCompatActivity {2345privateTextView show;6789@Override1011protectedvoidonCreate(Bundle savedInstanceState) {1213super.onCreate(savedInstanceState);1415setContentView(R.layout.activity_main);1617show =(TextView) findViewById(R.id.show);18192021}22232425publicvoiddownload(Vie...
privatestaticabstractclassWorkerRunnable<Params,Result>implementsCallable<Result>{Params[]mParams;} mFuture代表了AsyncTask要执行的任务的返回结果,其实就是个FutureTask,安装FutureTask标准用法,mWorker作为Callable被传给了mFuture,那么mFuture的结果就从mWorker执行的任务中取得。仔细看mWorker,return语句返回的结果就是...
class DownloadTask extends AsyncTask<Void, Integer, Boolean> { …… } 这里我们把 AsyncTask 的第一个泛型参数指定为 Void,表示在执行 AsyncTask 的时候不 需要传入参数给后台任务。第二个泛型参数指定为 Integer,表示使用整型数据来作为进度显 示单位。第三个泛型参数指定为 Boolean,则表示使用布尔型数据来反馈...
public class MyAsyncTask extends AsyncTask<Void, Void, List<String>> { // 在后台线程中执行耗时任务 @Override protected List<String> doInBackground(Void... voids) { // 执行耗时的数据加载和处理操作 List<String> dataList = loadData(); ...
public class MyAsyncTask extends AsyncTask<String, Integer, Bitmap> { @Override protected void onPreExecute() { super.onPreExecute(); // 在onPreExecute()中我们让ProgressDialog显示出来 progressDialog.show(); } @Override protected Bitmap doInBackground(String... params) { ...