在另一级Java编辑文本框 [英] java edit textfield in another class

问题描述

我有A类和B类A类要求在这里B类：

I have class A and class B. Class A calls class B here:

public void onClick(View v){
    //respond to clicks
    new MyTask().execute();

在这个新的任务，我做了一些网络垃圾，并最终找到了我要传回给A类的字符串。

In this new task, I do some network junk, and end up finding a string that I want to pass back to class A.

但我似乎无法做到这一点。我试图做类似classA.textfield.setText（文本），但没有奏效。它看起来像类不能返回值，无论是。我见过几个标记为类似的事情，但我不认为他们解决我的问题，如果他们这样做，我不知道如何实现它们。我喜欢这种感觉必须有一个超级简单的方法来做到这一点，但我唯一见过的提示声音甚至远程类似的是使一类的新版本，但听起来可怕的错误...

But I can't seem to do it. I tried to do something like classA.textfield.setText(text), but that didn't work. And it looks like classes can't return values, either. I've seen a few of the thing marked as similar, but I don't think they solve my issue, and if they do, I didn't understand how to implement them. I feel like this must have a super simple way to do it, but the only thing I've seen suggested that sound even remotely similar is making a new version of Class A, but that sounds horribly wrong...

推荐答案

这是其中回调或的ActionListener 编码模式显示它的实力。

This is where the Callback or ActionListener coding pattern shows it's strength.

在您MyTask类的类声明之后补充一点：

In your MyTask class add this after the class declaration:

public interface MyTaskActionListener{
    public void didFinish(String result);
}

成员加入您的MyTask类：

Add a member to your MyTask class:

private MyTaskActionListener listener;

现在，添加一个方法的setActionListener 来MyTask：

Now, add a method setActionListener to MyTask:

public void setActionListener(MyTaskActionListener l){
    listener = l;
}

接下来，在开始之前MyTask，设置监听器：

Next, before starting the MyTask, set the listener:

MyTask task = new MyTask();
task.setActionListener(new MyTaskActionListener(){
    public void didFinish(String result){
        yoirTextView.setText(result);
    }
});

最后但并非最不重要的，在MyTask的onPostExecute调用didFinish（）：

Last but not least, call didFinish() in MyTask's onPostExecute:

protected void onPostExecute(String result){
    listener.didFinish(result);
}

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