android - 长按一下从ListView中删除项目

Question

我在尝试从长按一下从列表视图中删除项目时遇到了一些麻烦.以下是代码:

public class MListViewActivity extends ListActivity {

private ListView lv;
private String[] some_data = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    some_data = getResources().getStringArray(R.array.mdata);

    // Bind resources Array to ListAdapter
    ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(this,
            R.layout.list_item, R.id.label, some_data);
    this.setListAdapter(myAdapter);

    lv = getListView();
    lv.setDividerHeight(3);

    lv.setOnItemLongClickListener(new OnItemLongClickListener() {

        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view,
                int arg2, long arg3) {

            // Can't manage to remove an item here

            return false;
        }
    });
}

任何帮助表示赞赏

Answer 1

您不应该使用Arrays,您应该使用ArrayList删除和添加项目Listview.

声明数组大小后,您可以修改特定索引中的数据,但不能删除项目或添加项目.

所以拿一个ArrayList,就在你长按ListView Item时,只需调用Arraylist的remove方法并通知更改的数据集.

例:

ArrayList<String> al = new ArrayList<String>();

在你的longclick里面写下面的代码来删除项目.

al.remove(arg2);//where arg2 is position of item you click
myAdapter.notifyDataSetChanged();

Answer 2

尝试

lv.setOnItemLongClickListener(new OnItemLongClickListener() {

    @Override
    public boolean onItemLongClick(AdapterView<?> parent, View view,
            int position, long arg3) {

              myAdapter.remove(some_data[position]);
              myAdapter.notifyDataSetChanged();

        return false;
    }

});