Android ListView 适配器 OnClickListener 问题

Question

我为每个 View 创建了一个带有自定义布局的 ListView。我在自定义布局中的 TextView 项目的 ListView 适配器中有几个 onClickListeners。 onClickListeners 在 ListView 适配器中工作，我可以获得 View 的位置，但是当我尝试在 onClickListeners 中调用我 Activity 中的方法时，我得到“无法进行静态引用到非静态方法”错误。所以我开始将东西转换为静态，这让事情按预期工作，但我相信你们都知道这是一个大错误，我终于明白了。

我如何在不将方法设为静态的情况下访问我的主要 Activity 中的方法？我是新手，所以请原谅我的菜鸟问题。谢谢

部分代码 list ...

public class main extends Activity {
    private ArrayList<DataItem> dataItems;
    private DataItemAdapter aa;
    private ListView dataListView;  

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

        dataListView = (ListView)findViewById(R.id.dataListView);     
        dataItems = new ArrayList<DataItem>();
        int resID = R.layout.dataitem;
        aa = new DataItemAdapter(this, resID, dataItems);
        dataListView.setAdapter(aa);
        dataListView.setItemsCanFocus(true);

    populateArray();
}

public void populateArray() {
    DataItem newItem = new DataItem(
            "2008","Ferrari","F430","Red","ASX772"
        );
    dataItems.add(0, newItem);
    newItem = new DataItem(
            "2008","Ferrari","F430","Black","TZB123"
        );
    dataItems.add(0, newItem);
    newItem = new DataItem(
            "2009","Ferrari","F430","Red","MIDAS"
        );
    dataItems.add(0, newItem);      

    aa.notifyDataSetChanged();
}

public static void modelInfo(int pos) {
    Log.i("modelInfo", "=" + pos);
}

public static void makeInfo(int pos) {
    Log.i("makeInfo", "=" + pos);
}

public static void assetInfo(int pos) {
    Log.i("assetInfo", "=" + pos);
}

}


public class DataItemAdapter extends ArrayAdapter<DataItem> {
    private Activity activity;
    private int resource;
    private static LayoutInflater inflater=null;

    public DataItemAdapter(Activity _activity,int _resource,List<DataItem> _items) {
        super(_activity, _resource, _items);
        inflater = (LayoutInflater)_activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        resource = _resource;
        activity = _activity;
    }

public static class ViewHolder {
    TextView carYear;
    TextView carMake;
    TextView carModel;
    TextView carColor;
    TextView assetTag;
   }

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View vi=convertView;
    ViewHolder holder;
    if (convertView == null) {
        vi = inflater.inflate(resource, null);
        holder=new ViewHolder();
        holder.carYear = (TextView)vi.findViewById(R.id.carYear);
        holder.carMake = (TextView)vi.findViewById(R.id.carMake);
        holder.carModel = (TextView)vi.findViewById(R.id.carModel);
        holder.carColor = (TextView)vi.findViewById(R.id.carColor);
        holder.assetTag = (TextView)vi.findViewById(R.id.assetTag);
        vi.setTag(holder);
    } else {
        holder=(ViewHolder)vi.getTag();
    }

    DataItem item = getItem(position);  

    holder.carYear.setText(item.getCarYear());
    holder.carMake.setText(item.getCarMake());
    holder.carModel.setText(item.getCarModel());
    holder.carColor.setText(item.getCarColor());
    holder.assetTag.setText(item.getAssetTag());

    holder.carYear.setTag(position);
    holder.assetTag.setTag(position);

    final OnClickListener makeListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            LinearLayout ll = (LinearLayout)v.getParent();
            TextView tv = (TextView)ll.getChildAt(0);
            Integer pos = (Integer) tv.getTag();
            main.makeInfo(pos);
        }
    };
    holder.carMake.setOnClickListener(makeListener);

    final OnClickListener modelListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            LinearLayout ll = (LinearLayout)v.getParent();
            TextView tv = (TextView)ll.getChildAt(0);
            Integer pos = (Integer) tv.getTag();
            main.modelInfo(pos);

        }
   };        

    holder.carModel.setOnClickListener(modelListener);

    final OnClickListener assetListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            LinearLayout ll = (LinearLayout)v.getParent();
            TextView tv = (TextView)ll.getChildAt(0);
            Integer pos = (Integer) tv.getTag();
            main.assetInfo(pos);
        }
    };
    holder.assetTag.setOnClickListener(assetListener);        

    return vi;
}

Answer 1

为什么不在 Activity 中将 onItemClickListener 附加到 ListView，而是从 ListView 中的每个内部 View 执行 ItemClick

        dataListView = (ListView)findViewById(R.id.dataListView);     
        dataItems = new ArrayList<DataItem>();
        int resID = R.layout.dataitem;
        aa = new DataItemAdapter(this, resID, dataItems);
        dataListView.setAdapter(aa);
        //attach a listener to the list view
        dataListView.setOnItemClickListener (listener);

        dataListView.setItemsCanFocus(true);

在 onItemClick 方法的监听器中，您可以访问 Activity 方法。

编辑 1:OnItemClickListener 给你以下参数，AdapterView parent, View view, int position, long

您的个人 TextView 是 View 参数的子项，您可以访问它以获取 childAt... 如下所示:

OnItemClickListener listener = new OnItemClickListener (){

  @Override
  onItemClick(AdapterView<?> parent, View view, int position, long id){
      ((TextView)view.findViewById(R.id.yourTextViewId)).getText();
      //or do your stuff
  }

}

编辑 2:

你的主要 Activity ，记住，按照惯例所有类名都是大写的，所以主类必须是主类

public class Main extends Activity {
    private ArrayList<DataItem> dataItems;
    private DataItemAdapter aa;
    private ListView dataListView;  

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

        dataListView = (ListView)findViewById(R.id.dataListView);     
        dataItems = new ArrayList<DataItem>();
        int resID = R.layout.dataitem;
        aa = new DataItemAdapter(this, resID, dataItems);
        dataListView.setAdapter(aa);
        dataListView.setItemsCanFocus(true);

    populateArray();
}

public void populateArray() {
    DataItem newItem = new DataItem(
            "2008","Ferrari","F430","Red","ASX772"
        );
    dataItems.add(0, newItem);
    newItem = new DataItem(
            "2008","Ferrari","F430","Black","TZB123"
        );
    dataItems.add(0, newItem);
    newItem = new DataItem(
            "2009","Ferrari","F430","Red","MIDAS"
        );
    dataItems.add(0, newItem);      

    aa.notifyDataSetChanged();
}

public void modelInfo(int pos) {
    Log.i("modelInfo", "=" + pos);
}

public void makeInfo(int pos) {
    Log.i("makeInfo", "=" + pos);
}

public void assetInfo(int pos) {
    Log.i("assetInfo", "=" + pos);
}
}

现在，你的适配器

public class DataItemAdapter extends ArrayAdapter<DataItem> {
    private Activity activity;
    private int resource;
    private LayoutInflater inflater=null;

    public DataItemAdapter(Activity _activity,int _resource,List<DataItem> _items) {
        super(_activity, _resource, _items);
        inflater = (LayoutInflater)_activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        //i always do this way, but i dont think this is the error
        //inflater = LayoutInflater.from(_activity.getBaseContext());
        resource = _resource;
        activity = _activity;
    }

public static class ViewHolder {
    TextView carYear;
    TextView carMake;
    TextView carModel;
    TextView carColor;
    TextView assetTag;
   }

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View vi=convertView;
    ViewHolder holder;
    if (convertView == null) {
        vi = inflater.inflate(resource, null);
        holder=new ViewHolder();
        holder.carYear = (TextView)vi.findViewById(R.id.carYear);
        holder.carMake = (TextView)vi.findViewById(R.id.carMake);
        holder.carModel = (TextView)vi.findViewById(R.id.carModel);
        holder.carColor = (TextView)vi.findViewById(R.id.carColor);
        holder.assetTag = (TextView)vi.findViewById(R.id.assetTag);
        vi.setTag(holder);
    } else {
        holder=(ViewHolder)vi.getTag();
    }

    DataItem item = getItem(position);  

    holder.carYear.setText(item.getCarYear());
    holder.carMake.setText(item.getCarMake());
    holder.carModel.setText(item.getCarModel());
    holder.carColor.setText(item.getCarColor());
    holder.assetTag.setText(item.getAssetTag());

    holder.carYear.setTag(position);
    holder.assetTag.setTag(position);

    final OnClickListener makeListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            LinearLayout ll = (LinearLayout)v.getParent();
            TextView tv = (TextView)ll.getChildAt(0);
            Integer pos = (Integer) tv.getTag();
            //main.makeInfo(pos);
            ((Main)activity).makeInfo(pos);
        }
    };
    holder.carMake.setOnClickListener(makeListener);

    final OnClickListener modelListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            LinearLayout ll = (LinearLayout)v.getParent();
            TextView tv = (TextView)ll.getChildAt(0);
            Integer pos = (Integer) tv.getTag();
            //main.modelInfo(pos);
            ((Main)activity).modelInfo(pos);
        }
   };        

    holder.carModel.setOnClickListener(modelListener);

    final OnClickListener assetListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            LinearLayout ll = (LinearLayout)v.getParent();
            TextView tv = (TextView)ll.getChildAt(0);
            Integer pos = (Integer) tv.getTag();
            //main.assetInfo(pos);
            ((Main)activity).assetInfo(pos);
        }
    };
    holder.assetTag.setOnClickListener(assetListener);        

    return vi;
}

希望它有用:)