如何从我的班级访问活动 UI? [英] How to access Activity UI from my class?

问题描述

我有一个活动，它创建了我的类的对象实例:

I have an activity which creates an object instance of my class:

file MyActivity.java:
public class MyActivity extends Activity {
    TextView myView = (TextView)findViewById(R.id.myView);
    ...
    Points myPoints new Points();
    ...
}
--------------------------------------------------------------

file Points.java:
private class Points {
    ...
    HOW TO USE myView HERE ???
    ...
}
--------------------------------------------------------------

我如何在我的类中使用 UI 对象(它不扩展活动)?我应该将一些上下文传递给我的 Points 类吗?我该怎么做?

How do I use the UI objects in my class (which does not extend an Activity)? Should I pass some context to my Points class? How do I do, exactly?

推荐答案

看到你的帖子，我已经编辑了它，以解决问题

see you post, i've edited it , to fix the problem

希望有帮助:=)

这里是

file MyActivity.java:
    public class MyActivity extends Activity {
    TextView myView ;
    protected void onCreate(android.os.Bundle savedInstanceState) {
        myView = (TextView)findViewById(R.id.myView);
            Points myPoints = new Points(this);
            myPoints.displayMsg("Hello World !!!");
    }  
    }

--------------------------------------------------------------

file Points.java:
private class Points {
    protected MyActivity context;
    //add a constructor with the Context of your activity
    public Points(MyActivity _context){
        context = _context;
    }

    public void displayMsg( final String msg){
        context.runOnUiThread(new Runnable() {

            @Override
            public void run() {
                context.myView.setText(msg);    
            }
        });
    }
}

这篇关于如何从我的班级访问活动 UI?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！