完成所有异步Http请求后执行功能

步骤1：创建接口TaskComplete，

public interface TaskComplete {
    public void TaskDone(String asyncClassName);
}

步骤2：在要调用异步任务的类中创建它的对象。

        TaskComplete taskComplete = new TaskComplete() {

        boolean firstDone = false;
        boolean secondDone = false;

        @Override
        public void TaskDone(String asyncClassName) {
            // TODO Auto-generated method stub

            if(asyncClassName.equals("FIRST_ASYNC")) {
                firstDone = true;
            } else if(asyncClassName.equals("SECOND_ASYNC")) {
                secondDone = true;
            }

            if(firstDone == true && secondDone == true) {
                // Both async completed - do your work
            }
        }
    };

步骤3：从异步类的相应onPostExecute方法调用它们。

    taskComplete.TaskDone("FIRST_ASYNC");
    taskComplete.TaskDone("SECOND_ASYNC");