制作自定义ListView的onClickListener

Question

我已经实现了一个自定义列表视图，我在创建它的 onClickListener 时遇到了问题。 在 OnCreate() 中

lv = (ListView) findViewById(R.id.listView1);
lv.setAdapter(new CustomAdapter(MainActivity.this,q));

&CustomAdapter 类：

 class CustomAdapter extends ArrayAdapter<GS>
  {
       ArrayList<GS> list;
       LayoutInflater mInfalter;    
       public CustomAdapter(Context context, ArrayList<GS> list)
       {
           super(context,R.layout.customlayout,list);
          this.list= list;  
          mInfalter = LayoutInflater.from(context);
        for(int i=0;i<list.size();i++)
        {
            Log.i("................",""+list.get(i).getAS_name());
        }
       }
}
       @Override
        public View getView(int position, View convertView, ViewGroup parent) {
          ViewHolder holder;
          Log.i("..........","Hello in getView");
          if(convertView==null)
          {
               convertView = mInfalter.inflate(R.layout.customlayout,parent,false);
               holder = new ViewHolder();
               holder.tv1 = (TextView)convertView.findViewById(R.id.textView1); 
               convertView.setTag(holder); 
          }else{
                holder = (ViewHolder)convertView.getTag();
          } 

                holder.tv1.setText(list.get(position).getAS_name());

          return convertView;
    }

  }

 static class ViewHolder
    {
        TextView tv1;
    }  

它的 OnClickListener 是否必须在 getView() 方法中创建？ 或者它可以在 OnCreate() 中制作？ 怎么做？

谢谢

Answer 1

这是我刚刚整理并测试的一个独立示例，希望对您有所帮助：

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnItemClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        List<MyCustomAdapterItem> items = new ArrayList<MyCustomAdapterItem>();
        items.add(new MyCustomAdapterItem("1", "one"));
        items.add(new MyCustomAdapterItem("2", "two"));

        ListView listView = (ListView) findViewById(R.id.listView1);
        listView.setAdapter(new MyAdapter(this, android.R.layout.simple_list_item_1, items));
        listView.setOnItemClickListener(this);
    }

    private class MyAdapter extends ArrayAdapter<MyCustomAdapterItem> {
        public MyAdapter(Context context, int textViewResourceId, List<MyCustomAdapterItem> objects) {
            super(context, textViewResourceId, objects);
        }
    }

    private class MyCustomAdapterItem {
        private String id;
        private String text;

        public MyCustomAdapterItem(String id, String text) {
            this.id = id;
            this.text = text;
        }

        public String getText() {
            return text;
        }

        public String getId() {
            return id;
        }

        @Override
        public String toString() {
            return getText();
        }
    }

    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
        MyCustomAdapterItem myCustomAdapterItem = (MyCustomAdapterItem) adapterView.getItemAtPosition(position);
        if ("1".equals(myCustomAdapterItem.getId())) {
            Toast.makeText(this, "I can't believe you just selected this item!!!", Toast.LENGTH_SHORT).show();
        } else if ("2".equals(myCustomAdapterItem.getId())) {
            Toast.makeText(this, "This item is better than the first", Toast.LENGTH_SHORT).show();
        }
    }
}

请注意，在此示例中，Activity 实现了 AdapterView OnItemClickListener 接口。每当您单击列表中的任何项目时，都会调用 onItemClick 方法。只需确保将 Activity 也设置为 OnItemClickListener，否则不会调用 onItemClick：

listView.setOnItemClickListener(this)

这个 onItemClick 实现演示了一种方法，您可以根据单击的项目有条件地执行不同的逻辑。如果您提前知道固定位置索引，您也可以只使用位置参数。