如何让ListView的Adapter中的OnClick调用Activity的函数 [英] How to let OnClick in ListView's Adapter call Activity's function

问题描述

我有一个带有 ListView 的 Android 应用程序，ListView 可以正常设置，但现在我希望 ListView 中的图像可以点击.我通过使用 2 个类、Activity 类(父级)和 ArrayAdapter 来填充列表.在 ArrayAdapter 中，我为列表中我希望可点击的图像实现了 OnClickListener.

I have an Android application with a ListView in it, the ListView will setup fine but now I want a image in the ListView to be clickable. I do this by using 2 classes, the Activity class (parent) and an ArrayAdapter to fill the list. In the ArrayAdapter I implement a OnClickListener for the image in the list that I want to be clickable.

到目前为止一切正常.

但是现在我想在 onClick (对于列表中的图像)运行时从活动类运行一个函数，但我不知道如何.以下是我使用的 2 个类.

But now I want to run a function from the activity class when the onClick, for the image in the list, is run but I do not know how. Below are the 2 classes that I use.

首先是Activity类:

First the Activity class:

public class parent_class extends Activity implements OnClickListener, OnItemClickListener
{
    child_class_list myList;
    ListView myListView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // setup the Homelist data
        myList     = new child_class_list (this, Group_Names, Group_Dates);
        myListView = (ListView) findViewById(R.id.list);

        // set the HomeList
        myListView.setAdapter( myList );
        myListView.setOnItemClickListener(this);
    }

    void function_to_run()
    {
        // I want to run this function from the LiscView Onclick
    }

    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) 
    {
        // do something
    }
}

还有我想从 Activity 类调用函数的 ArrayAdapter:

And the ArrayAdapter from where I want to call a function from the Activity class:

public class child_class_list extends ArrayAdapter<String>
{
    // private
    private final Context context;
    private String[]        mName;
    private String[]        mDate;

    public child_class_list (Context context, String[] Name, String[] Date) 
    {
        super(context, R.layout.l_home, GroupName);
        this.context        = context;
        this.mName      = Name;
        this.mDate  = Date;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View rowView = inflater.inflate(R.layout.l_home, parent, false);

        ImageView selectable_image = (ImageView) rowView.findViewById(R.id.l_selectable_image);
        selectable_image.setOnClickListener(new OnClickListener()
        {
            public void onClick(View v) 
            {
                // I want to run the function_to_run() function from the parant class here
            }
        }
        );

        // get the textID's
        TextView tvName = (TextView) rowView.findViewById(R.id.l_name);
        TextView tvDate = (TextView) rowView.findViewById(R.id.l_date);

        // set the text
        tvName.setText      (mName[position]);
        tvDate.setText  (mDate[position]);

        return rowView;
    }
}

如果有人知道如何从 arrayadapter 运行活动类中的函数或如何在 Activity 类中设置图像 onClickListener，我会非常感谢帮助.

If anyone knows how to run the function in the activity class from the arrayadapter or how to set the image onClickListener in the Activity Class I would greatly apriciate the help.

推荐答案

在onClick()里面做这样的事情:

((ParentClass) context).functionToRun();

这篇关于如何让ListView的Adapter中的OnClick调用Activity的函数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！