如何让ListView的Adapter中的OnClick调用Activity的函数

Question

我有一个带有ListView的Android应用程序,ListView将设置正常,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)和ArrayAdapter来填充列表.在ArrayAdapter中,我为列表中我想要点击的图像实现了一个OnClickListener.

到目前为止一切都有效.

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

首先是Activity类:

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
    }
}

我想从Activity类中调用函数的ArrayAdapter:

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;
    }
}

如果有人知道如何在arrayadapter中运行活动类中的函数,或者如何在Activity类中设置图像onClickListener,我会非常熟悉帮助.

Answer 1

里面onClick()做这样的事情:

((ParentClass) context).functionToRun();

Answer 2

只是为了清楚地扩展提供的答案在BaseAdapter中,您可以通过调用获取父类this.getActivity();如果您然后将其类型化为实际的活动类,则可以根据下面的@AdilSoomro答案调用函数,这样您实际上最终会得到类似的东西

public class MyAdapter extends BaseAdapter<Long> {
    public MyAdapter(Activity activity,
            TreeStateManager<Long> treeStateManager, int numberOfLevels) {
        super(activity, treeStateManager, numberOfLevels);
    }

    @Override
    public void handleItemClick(final View view, final Object id) {
        ((MyActivity) this.activity).someFunction();
    }
}

然后在MyActivity中声明someFunction以执行您想要的操作

    protected void someFunction(){
//    Do something here
    }