安卓：事件侦听器添加到每个项目在ListView [英] Android: Add event listeners to every item in a ListView

问题描述

我有一个ListView的Andr​​oid应用程序，并在列表中的每一行都有一个TextView和一个按钮。我想要做的是一个OnClickListener添加到ListView的每个按钮，但我无法弄清楚如何获得某种参照每个按钮......任何人都可以请给我一个提示？

下面是我的XML绑定到该ListAdapter：

 ＆LT; RelativeLayout的的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
机器人：layout_width =FILL_PARENT
机器人：layout_height =WRAP_CONTENT＆GT;
＆LT;的TextView
    机器人：ID =@ + ID / row_text
    机器人：layout_width =WRAP_CONTENT
    机器人：layout_height =WRAP_CONTENT
    机器人：layout_alignParentLeft =真
    机器人：TEXTSIZE =18sp＆GT;
＆LT; / TextView的＆GT;
＆LT;按钮
    机器人：ID =@ + ID / row_button
    机器人：layout_width =WRAP_CONTENT
    机器人：layout_height =WRAP_CONTENT
    机器人：layout_alignParentRight =真/＆GT;
＆LT; / RelativeLayout的＆GT;
 

和我想这样的事情，但它不工作：

  SimpleCursorAdapter行=新SimpleCursorAdapter（这一点，R.layout.row_layout，光标，从，到）;
setListAdapter（行）;
Button按钮=（按钮）getListAdapter（）getView（0，空，getListAdapter（））findViewById（R.id.row_button）。
button.setOnClickListener（新View.OnClickListener（）{
    @覆盖公共无效的onClick（视图v）{
        Log.i（TAG，点击）;
    }
}）;
 

解决方案

这是不可能使用 SimpleCursorAdapter ...你必须创建自己的适配器。如果您不想编写自定义适配器，至少设法加强与新功能的SimpleCursorAdapter。例如：

 公共类YourAdapter扩展SimpleCursorAdapter {

    公共YourAdapter（上下文的背景下，INT布局，光标C，的String []从，INT []键）{
        超（背景下，布局，C，从，到）;
    }

    公共查看getView（INT位置，查看convertView，ViewGroup中父）{
        查看查看= super.getView（位置，convertView，父母）;
        Button按钮=（按钮）view.findViewById（R.id.row_button）;
        button.setOnClickListener（新View.OnClickListener（）{
            @覆盖公共无效的onClick（视图v）{
                Log.i（TAG，点击）;
            }
        }）;
        返回查看;
    }
}
 

然后，你可以这样做：

  SimpleCursorAdapter行=新YourAdapter（这一点，R.layout.row_layout，光标，从，到）;
setListAdapter（行）;
 

I have an Android app with a ListView, and each row in the list has a TextView and a Button. What I want to do is add an OnClickListener to each Button in the ListView, but I can't figure out how to get some sort of reference to every Button... Can anyone please give me a hint?

Here's my XML that's bound to the ListAdapter:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView 
    android:id="@+id/row_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:textSize="18sp">
</TextView>
<Button
    android:id="@+id/row_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true" />
</RelativeLayout>

And I tried something like this, but it doesn't work:

SimpleCursorAdapter rows = new SimpleCursorAdapter(this, R.layout.row_layout, cursor, from, to);
setListAdapter(rows);
Button button = (Button) getListAdapter().getView(0, null, getListAdapter()).findViewById(R.id.row_button);
button.setOnClickListener(new View.OnClickListener() {
    @Override public void onClick(View v) {
        Log.i(TAG, "clicked");
    }
}); 

解决方案

It's not possible using SimpleCursorAdapter... you will have to create your own adapter. If you don't want to write a custom Adapter, at least try to enhance the SimpleCursorAdapter with new capabilities. For instance:

public class YourAdapter extends SimpleCursorAdapter{

    public YourAdapter(Context context, int layout, Cursor c, String[] from, int[] to) {
        super(context, layout, c, from, to);
    }

    public View getView(int position, View convertView, ViewGroup parent){
        View view = super.getView(position, convertView, parent);
        Button button = (Button)view.findViewById(R.id.row_button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override public void onClick(View v) {
                Log.i(TAG, "clicked");
            }
        }); 
        return view;
    }
}

Then, you can do:

SimpleCursorAdapter rows = new YourAdapter(this, R.layout.row_layout, cursor, from, to);
setListAdapter(rows);

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