Question

我有自定义列表查看：我想在我的应用程序中，单击按钮，删除项目列表视图

我不明白如何编辑我班级中的方法以进行删除项目自定义列表视图... 请帮我写一个删除项目的方法.. 谢谢你

java代码是：

public class MainActivity extends Activity{

String[] name;
String[] family;


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

    name=new String[]{"aaa","bbb","samad","yoset","hasan"};
    family=new String[]{"AAA","Ahamadi","Ahamadi","Ahamadi","Ahamadi"};

  ListView list=(ListView) findViewById(R.id.list_view);

    MyAdapter adapter=new MyAdapter(getApplicationContext());




   list.setAdapter(adapter);





}



private class MyAdapter extends BaseAdapter
 {
LayoutInflater MyInflater;
public MyAdapter(Context context) 
{
    MyInflater=LayoutInflater.from(context);
}




@Override
public int getCount() {
    // TODO Auto-generated method stub
    return name.length;
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

@SuppressLint("InflateParams")
@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder X=new ViewHolder();
    View row=null;
Object user = getItem(position);
user.

    if(convertView==null)
    {
        convertView=MyInflater.inflate(R.layout.list_item,null);

        X.Name=(TextView) convertView.findViewById(R.id.Text_name);
        X.Family=(TextView) convertView.findViewById(R.id.Text_family);

        convertView.setTag(X);
    }

    else{

        X=(ViewHolder)convertView.getTag();
    }


    X.Name.setText(name[position]);
    X.Family.setText(family[position]);



    // TODO Auto-generated method stub
    return convertView;
}


//-class Holder
public class ViewHolder
{

    TextView Name;
    TextView Family;
}


 }


}

我不明白如何编辑我班级中的方法以进行删除项目自定义列表视图... 请帮我写一个删除项目的方法.. 谢谢你

Answer 1

Object item = adapter.getItem(position);

adapter.remove(item);

adapter.notifyDataSetChanged();

Answer 2

您正在扩展BaseAdapter，这就是为什么您没有获得remove方法，它在ArrayAdapter，SimplerAdapter中可用。不要担心在自定义适配器中编写自己的删除方法 -

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

    name=new String[]{"aaa","bbb","samad","yoset","hasan"};
    family=new String[]{"AAA","Ahamadi","Ahamadi","Ahamadi","Ahamadi"};
    List<String> nameList = new ArrayList<String>(Arrays.asList(name));
    List<String> familyList = new ArrayList<String>(Arrays.asList(family));

    ListView list=(ListView) findViewById(R.id.list_view);

    MyAdapter adapter=new MyAdapter(getApplicationContext());

    list.setAdapter(adapter);

}

private class MyAdapter extends BaseAdapter{
LayoutInflater MyInflater;
public MyAdapter(Context context) 
{
    MyInflater=LayoutInflater.from(context);
}


public void remove(int pos)
{
  nameList.remove(pos);
  familyList.remove(pos);

}

@Override
public int getCount() {
    return nameList.size();
}

@Override
public Object getItem(int position) {

    return position;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

@SuppressLint("InflateParams")
@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder X=new ViewHolder();
    View row=null;
Object user = getItem(position);


    if(convertView==null)
    {
        convertView=MyInflater.inflate(R.layout.list_item,null);

        X.Name=(TextView) convertView.findViewById(R.id.Text_name);
        X.Family=(TextView) convertView.findViewById(R.id.Text_family);

        convertView.setTag(X);
    }

    else{

        X=(ViewHolder)convertView.getTag();
    }


    X.Name.setText(nameList.get(position));
    X.Family.setText(familyList.get(position));



    // TODO Auto-generated method stub
    return convertView;
}


//-class Holder
public class ViewHolder
{

    TextView Name;
    TextView Family;
}


 }

现在删除项目使用此代码 -

  ((MyAdapter)list.getAdapter()).remove(position);
  ((MyAdapter)list.getAdapter()).notifyDataSetChanged();

并且您的适配器设计不太好，请尝试改进它。并使用ArrayList作为适配器而不是数组，它更灵活。

如果它解决了您的问题，请不要忘记标记为正确。

如何在android中删除自定义列表视图项？

2 个答案: