上下文菜单。 （Android，SherlockActionbar）

Question

我真的需要你的帮助。首先，我创建了一个从SherlockListFragment扩展的Customfragment。我实现了自己的Listviewrow设计，因此我创建了自己的BaseAdapter。列表视图行包含复选框和一些文本视图。 我的目标是构建一个列表视图，其外观和交互方式类似于Gmail应用。 这意味着如果用户点击该复选框，则会激活操作上下文菜单。

所以这些是我的课程：

public class PurchasesOpenFragment extends SherlockListFragment implements
    OnItemClickListener, ListViewContextualMenuListener {

private ActionMode actionMode;
ArrayList<String> purchases = new ArrayList<String>();

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    purchases.add("Temp 1");
    purchases.add("Temp 5");
    purchases.add("Temp 2");
    purchases.add("Temp 3");
    purchases.add("Temp 4");
    purchases.add("Temp 6");
    purchases.add("Temp 7");

    PurchaseOpenAdapter purchaseAdapter = new PurchaseOpenAdapter(
            getActivity().getBaseContext(), purchases);
    setListAdapter(purchaseAdapter);

    purchaseAdapter.setOnListViewContextualMenuListener(this);

    return super.onCreateView(inflater, container, savedInstanceState);
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    getListView().setOnItemClickListener(this);
}



@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    Toast toast = Toast.makeText(getActivity(),
            "Show details of element with id: " +arg3,Toast.LENGTH_SHORT);
    toast.show();
}

private final class ModeCallback implements ActionMode.Callback {

    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        // Create the menu from the xml file
        MenuInflater inflater = getSherlockActivity()
                .getSupportMenuInflater();
        inflater.inflate(R.menu.context_test, menu);
        return true;
    }

    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        // Here, you can checked selected items to adapt available actions
        return false;
    }

    @Override
    public void onDestroyActionMode(ActionMode mode) {
        // Destroying action mode, let's unselect all items
        for (int i = 0; i < getListView().getAdapter().getCount(); i++)
            getListView().setItemChecked(i, false);

        if (mode == actionMode) {
            actionMode = null;
        }
    }

    @Override
    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        long[] selected = getListView().getCheckedItemIds();

        Toast toast = Toast.makeText(getActivity(), "elements selected: "
                + selected.length, Toast.LENGTH_SHORT);
        toast.show();

        if (selected.length > 0) {
            for (long id : selected) {
                toast = Toast.makeText(getActivity(), "element selected with id: " + id,
                        Toast.LENGTH_SHORT);
                toast.show();
            }
        }
        mode.finish();
        return true;
    }
};

public void closeContextualMenu() {
    if (actionMode != null) {
        actionMode.finish();
        actionMode = null;
    }
}

/**
 * 
 */
@Override
public void onItemCheckBoxChanged(int position, boolean checkState) {
    Toast toast = Toast.makeText(getActivity(), "pos: " + position
            + " check: " + checkState, Toast.LENGTH_SHORT);
    toast.show();

    getListView().setItemChecked(position, checkState);

    int amountOfCheckedElements = getListView().getCheckedItemIds().length;

    if (amountOfCheckedElements > 0) {
        if (actionMode == null) {
            actionMode = getSherlockActivity().startActionMode(
                    new ModeCallback());
        }
        actionMode.setTitle(amountOfCheckedElements + " selected");
        return;
    } else {
        if (actionMode != null) {
            actionMode.finish();
        }
    }

}

}

第二课：

公共类PurchaseOpenAdapter扩展BaseAdapter实现OnClickListener {

private Context context;
private ArrayList<String> purchases;
private static LayoutInflater inflator;
private ListViewContextualMenuListener contextualListener;

public PurchaseOpenAdapter(Context context, ArrayList<String> purchases) {
    this.context = context;
    this.purchases = purchases;
    inflator = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

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

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

@Override
public long getItemId(int position) {
    return position;
}

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

    ViewHolder holder;
    boolean checkBoxChanged = false;

    if (convertView == null) {
        convertView = inflator
                .inflate(R.layout.listview_row, parent, false);

        holder = new ViewHolder();
        holder.tvDate = (TextView) convertView
                .findViewById(R.id.listview_purchase_date);
        holder.tvTitle = (TextView) convertView
                .findViewById(R.id.listview_purchase_title);
        holder.tvSupermarket = (TextView) convertView
                .findViewById(R.id.listview_supermarket);
        holder.tvArticleAmount = (TextView) convertView
                .findViewById(R.id.listview_article_amount);
        holder.checkBox = (CheckBox) convertView
                .findViewById(R.id.listview_checkbox);

        holder.checkBox.setTag(position);
        holder.checkBox.setOnClickListener(this);

        convertView.setTag(holder);

    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    // TODO only temp data
    String temp = purchases.get(position);

    holder.tvDate.setText("01.01.2001");
    holder.tvTitle.setText(temp);
    holder.tvSupermarket.setText("Spar");
    holder.tvArticleAmount.setText("20 Articles");

    return convertView;
}

@Override
public boolean hasStableIds() {
    return true;
}

public void setOnListViewContextualMenuListener(
        ListViewContextualMenuListener l) {
    contextualListener = l;
}

@Override
public void onClick(View v) {
    CheckBox cb = (CheckBox) v;
    Toast toast = Toast
            .makeText(context, "Checkboxstate of element with positon: "
                    + v.getTag() + " check state: " + cb.isChecked(),
                    Toast.LENGTH_SHORT);
    toast.show();
    contextualListener.onItemCheckBoxChanged(Integer
            .parseInt(cb.getTag().toString()),
            cb.isChecked());
}

static class ViewHolder {
    TextView tvDate;
    TextView tvTitle;
    TextView tvSupermarket;
    TextView tvArticleAmount;
    CheckBox checkBox;
}

}

正如您在此处所见，我使用OnClickMethod实现了PurchaseOpenAdapter中的复选框。 要通知PurchaseOpenFragment复选框的状态已更改，我创建了自己的监听器（onItemCheckBoxChanged）。

所以现在我来描述我的问题： 我点击复选框，出现上下文菜单，但没有选中复选框，但如果我检查复选框的状态，一切正常（id和isChecked（）是正确的。）

如果我关闭上下文菜单，则会选中该复选框。

如果我再次点击同一个复选框，则ID完全错误。 如果我在适配器类中删除了侦听器执行，则复选框可以正常工作。

希望有人可以帮助我。也许还有另一种方法来通知listfragment类。 提前谢谢！

由于我是新用户，我不允许发布图片，但如果有必要，我可以通过邮件发送。