android - 使用 setOnItemLongClickListener 选择列表中的多个项目

Question

我在 Android ListView 中有一个消息列表。我想在长按时从列表中删除消息。我已经在列表选择器中声明了所有状态，但仍处于长按状态。长按后，列表中的特定项目不会保持焦点或选中状态。我尝试设置 view.setselected(true)，但它也不起作用。我做错了什么吗？

这是我的列表选择器。

<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item 
 android:state_selected="false"
    android:state_pressed="false" 
    android:drawable="@drawable/row_item_image" />
<item android:state_pressed="true" 
    android:drawable="@drawable/row_item_hover_image" />
<item android:state_focused="true" 
    android:drawable="@drawable/row_item_hover_image" />
<item android:state_selected="true" 
    android:drawable="@drawable/row_item_hover_image" />
</selector>

这是我的监听器界面:

listview.setOnItemLongClickListener(new OnItemLongClickListener() 
{

    @Override
    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long arg3) {
        // TODO Auto-generated method stub
        //view.setSelected(true);
        if(view.isPressed())
        {
        view.setSelected(true);
        }
        return false;
    }
});

Answer 1

您不需要实现 OnItemLongClickListener，因为 ListView 本身具有您想要的功能。在您的 Activity 中试试这个:

listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
    listView.setMultiChoiceModeListener(new MultiChoiceModeListener() {

        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        public void onDestroyActionMode(ActionMode mode) {
            editListAdapter.removeSelection();

        }

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            mode.getMenuInflater().inflate(R.menu.delete_action_mode, menu);
            return true;
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            switch (item.getItemId()) {
            case R.id.delete_mode:
                SparseBooleanArray selected = editListAdapter.getSelectedIds();
                for (int i = (selected.size() - 1); i >= 0; i--) {
                    if (selected.valueAt(i)) {
                        User selectedItem = editListAdapter.getItem(selected.keyAt(i));
                        editListAdapter.remove(selectedItem);
                    }
                }
                mode.finish();
                return true;
            default:
                return false;
            }
        }

        @Override
        public void onItemCheckedStateChanged(ActionMode mode, int position, long id,
                boolean checked) {
            int checkedCount = listView.getCheckedItemCount();
            mode.setTitle(checkedCount + " selected");
            editListAdapter.toggleSelection(position);
        }
    });

你的 ArrayAdapter 类应该是这样的:

public class UserListAdapter extends ArrayAdapter<User> {

LayoutInflater inflater;
private int resId;
private TextView userPosition, userName, userLogin, userPassw, userStatus, userRole;
private SparseBooleanArray mSelectedItemsIds;
private List<User> userList;

public UserListAdapter(Context context, int resource, List<User> users) {
    super(context, resource, users);
    this.resId = resource;
    this.inflater = LayoutInflater.from(context);
    this.userList = users;
    mSelectedItemsIds = new SparseBooleanArray();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    User user = getItem(position);
    UserItemHelper helper;
    if (convertView == null) {
        convertView = inflater.inflate(resId, parent, false);
        userPosition = (TextView) convertView.findViewById(R.id.user_item_position);
        userName = (TextView) convertView.findViewById(R.id.user_item_name);
        userLogin = (TextView) convertView.findViewById(R.id.user_item_login);
        userPassw = (TextView) convertView.findViewById(R.id.user_item_passw);
        userStatus = (TextView) convertView.findViewById(R.id.user_item_status);
        userRole = (TextView) convertView.findViewById(R.id.user_item_role);
        helper = new UserItemHelper(userPosition, userName, userLogin, userPassw, userStatus, userRole);
        convertView.setTag(helper);
    } else {
        helper = (UserItemHelper)convertView.getTag(); 
    }
    helper.getPosition().setText(position + 1 + "");
    helper.getName().setText(user.getName());
    helper.getLogin().setText(user.getLogin());
    helper.getPassw().setText(user.getPassw());
    helper.getStatus().setText(user.getStatus() +"");
    helper.getRole().setText(user.getRole()+"");
    return convertView;
}

public ArrayList<String> getItemsName() {
    ArrayList<String> names = new ArrayList<String>();
    for (int i = 0; i < getCount(); i++) {
        names.add(getItem(i).getName().toLowerCase());
    }
    return names;
}

@Override
public void remove(User object) {
    // TODO Auto-generated method stub
    super.remove(object);
}

public void toggleSelection(int position) {
    selectView(position, !mSelectedItemsIds.get(position));
}

public void removeSelection() {
    mSelectedItemsIds = new SparseBooleanArray();
    notifyDataSetChanged();
}

private void selectView(int position, boolean value) {
    if (value)
        mSelectedItemsIds.put(position, value);
    else
        mSelectedItemsIds.delete(position);
    notifyDataSetChanged();

}

public SparseBooleanArray getSelectedIds() {
    return mSelectedItemsIds;

}

同时创建菜单 xml。

  <?xml version="1.0" encoding="utf-8"?>
  <menu xmlns:android="http://schemas.android.com/apk/res/android" >

      <item
         android:id="@+id/delete_mode"
         android:icon="@drawable/delete"
         android:title="@string/delete_text"/>

   </menu>