我应该使用的AsyncTask类扩展活动的MainActivity里面？ [英] Should I use AsyncTask class inside the MainActivity extending Activity?

问题描述

我在想，如果的AsyncTask 调整为主要活动内使用（MainActivity.java <$ C C $>）运行线。

I was wondering if AsyncTask was made to be used inside the main activity (MainActivity.java) running the thread.

例如，我发现很多教程时使用的AsyncTask 他们宣布延长活动的主类中的私有类而不是创建一个独立的的.java 文件的的AsyncTask （ MyAsyncTask.java ）类。

For example I noticed many tutorials when using the AsyncTask they declare a private class inside the main class extending the Activity rather than creating an independent .java file for that AsyncTask (MyAsyncTask.java) class.

不过，我注意到，使用一个独立的文件，当我不能够运行 runOnUIThread （），因为它属于活动类，所以我怎么样才能用这种方法里面那个独立的的AsyncTask （MyAsyncTask.java），它扩展了的AsyncTask ，而不是活动。

But I noticed that when using an independent file i'm not being able to run the runOnUIThread() because it belongs to the Activity class, so how will i be able to use this method inside that independent AsyncTask (MyAsyncTask.java) which extends AsyncTask and not Activity.

推荐答案

这是完全没问题。我经常这样做，但是这取决于你如何使用它。如果它可以由诺特活动然后我给它自己的类或共享类。但是，如果它是一个单一的目的，那么我会让它的内部类的 MainActivity 。

That is completely fine. I do it often but it depends on how you are using it. If it may be used by othe Activities then I give it it's own class or a shared class. But if it is for a single purpose then I would make it an inner class of the MainActivity.

使它的内部类的好处是，它可以直接访问的类成员变量。如果你让一个单独的类，那么你只需要创建一个构造函数，如果你需要传递 PARAMS 如上下文或其它变量。

The benefit of making it an inner class is that it has direct access to that classes member variables. If you make it a separate class then you just need to create a constructor for it if you need to pass in params such as a context or other variables.

我不知道你在做什么，但我不知道你需要 runOnUiThread（）。您可以创建在的AsyncTask 文件中的构造函数，并让它接受上下文，因为你需要一个参数和其他任何。然后，您可以更新 UI 在 onPostExecute（）

I don't know exactly what you are doing but I'm not sure you need runOnUiThread(). You can create a constructor in your AsyncTask file and have it accept context as a param and whatever else you need. Then you can update the UI in onPostExecute()

示例

Public class MyAsyncTask extends AsyncTask
{

private Context context; 

public MyAsyncTask(Context context) {  // can take other params if needed
    this.context = context;
}

// Add your AsyncTask methods and logic
//you can use your context variable in onPostExecute() to manipulate activity UI
}`

然后把它在你的 MainActivity

MyAsyncTask myTask = new MyAsyncTask(this);  //can pass other variables as needed
myTask.execute();

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