Question

我对Java很新，对listviews几乎没有经验。我已经能够使用自定义列表适配器将项目成功添加到列表视图中。但是，我现在想要在触摸每个项目时执行操作。

触摸列表项时，我无法获取OnItemClickListener事件，我不确定问题出在哪里。

代码：

public class FragmentA extends Fragment implements OnItemClickListener{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

    View V = inflater.inflate(R.layout.fragment_a, container, false);

    ListView listView = (ListView)V.findViewById(R.id.list);


        getData data = getData.getMyData();


      CustomList adapter = new
            CustomList(getActivity(), data.Headline.toArray(new String[data.Headline.size()]), data.Description.toArray(new String[data.Description.size()]), data.imageId.toArray(new Integer[data.imageId.size()]));      
      listView.setAdapter(adapter);

    return V;

}

public void onItemClickListener(AdapterView<?> parent, View view, int position, long id)
{
    Log.e("CLICKED","CLICKED");
}
}

如果有帮助，这里是自定义适配器类的代码：

public class CustomList extends ArrayAdapter<String>{

private final Activity context;
private final String[] titleId;
private final String[] descriptionId;
private final Integer[] pictureid;

public CustomList(Activity context,
String[] Headline, String[] Description, Integer[] imageId) {
super(context, R.layout.single_row, Headline);
this.context = context;
this.titleId = Headline;
this.descriptionId = Description;
this.pictureid = imageId;

}
@Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View rowView= inflater.inflate(R.layout.single_row, null, true);

TextView txtTitle = (TextView) rowView.findViewById(R.id.tvTitle);
TextView txtDescription = (TextView) rowView.findViewById(R.id.tvDescription);
ImageView imageView = (ImageView) rowView.findViewById(R.id.ivIcon);

txtTitle.setText(titleId[position]);
txtDescription.setText(descriptionId[position]);
imageView.setImageResource(pictureid[position]);
return rowView;
}

}

Answer 1

将侦听器设置为ListView：

listView.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Log.e("CLICKED","CLICKED");
    }
});

Answer 2

您必须使用listView.setOnItemClickListener将回调链接到视图。

您可以执行以下操作：

listView.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> adapter, View view,int pos, long id) {
        //Your code here
    }
});

但是，在您的情况下，由于活动已经实现了OnItemClickListener（），您可以简单地：

listView.setOnItemClickListener(this);

无法让OnItemClickListener在Java中为Android运行

2 个答案: