Question

我有这样的代码，这只是一个带有事件监听器的类对象的示例类。

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style>
        @font-face 
        { 
        font-family: Black Rose; src: url('BLACKR.TTF'); 
        } 
        h3 {
        font-family: 'Black Rose'
        }
</style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Image ID="Image1" runat="server" />
        <br />
        <h3>This is what the Image Font Looks Like</h3>
    </div>
    </form>
</body>
</html>

我的问题是：如何在触发frag对象的事件时调用类MyActivity中的方法setText？

还是有另一种方法可以做到这一点？

任何答案都将不胜感激，谢谢！

Answer 1

你可以这样做：

public class MyActivity ..... {

     EditText something;
     AnyFragment frag;

     public MyActivity(){
          frag = new AnyFragment(this);
     }

     public void setText(String text){
          something.setText(text);
     }
}

public class AnyFragment extends DialogFragment implements AnyListener{

     private Context context;

     public AnyFragment(Context context) {
         this.context = context;
     }

     public void onEvent(String text){
         ((MyActivity)context).setText(text);
     }
}

或使用interface：

public class MyActivity ..... {

     EditText something;
     AnyFragment frag;

     public MyActivity(){
         frag = new AnyFragment();
         frag.setFragListener(new AnyFragment.FragListener() {
             @Override
             public void notifyActivity(String text) {
                 setText(text);
             }
         });
     }

     public void setText(String text){
         something.setText(text);
     }
}

public class AnyFragment extends DialogFragment implements AnyListener{

    private FragListener listener;

    public setFragListener(FragListener listener) {
        this.listener = listener;
    }

    public void onEvent(String text){
        if(listener != null)
            listener.notifyActivity(text);
    }

    public interface FragListener {
        void notifyActivity(String text);
    }
}

如何在类中触发对象的事件时调用该方法

1 个答案: