Question

所以我有一个GridView，我希望能够长按元素以启用上下文操作栏吗？我查了很多教程，包括https://www.bignerdranch.com/blog/recyclerview-part-2-choice-modes/和https://android.googlesource.com/platform/development/+/master/samples/ApiDemos/src/com/example/android/apis/view/List15.java，以及其他所有教程都说明当使用CHOICE_MODE_MULTIPLE_MODAL时，MultiChoiceModeListener应该在长按时自动使用

我看到许多教程使用它（就是这样）并且它可以工作，但是当我长时间按下我的GridView中的元素时，CAB无法启动（也没有调用onCreateActionView）我绝对无法弄清楚这是为什么。

这是我的GridView代码

receiptGridView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE_MODAL);
            receiptGridView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
                //                int count = 0;
                ArrayList<Receipt> tmp = new ArrayList();
                @Override
                public boolean onCreateActionMode(android.view.ActionMode actionMode, Menu menu) {
                    Log.d("DEBUG","Created action mode!");
                    MenuInflater inflater = actionMode.getMenuInflater();
                    inflater.inflate(R.menu.context_delete, menu);
                    return true;
                }

                @Override
                public void onItemCheckedStateChanged(android.view.ActionMode actionMode, int i, long l, boolean b) {

                    receiptGridView.setSelection(i);
                    Receipt r = (Receipt) listAdapter.getItem(i);
                    if(b) {
                        tmp.add(r);
                    }
                    else {
                        tmp.remove(r);
                    }
                    actionMode.setTitle("Delete Items");
                    actionMode.setSubtitle(receiptGridView.getCheckedItemCount() + " items selected.");
                }

                @Override
                public boolean onPrepareActionMode(android.view.ActionMode actionMode, Menu menu) {
                    return true;
                }

                @Override
                public boolean onActionItemClicked(android.view.ActionMode actionMode, MenuItem menuItem) {
                    switch (menuItem.getItemId()) {
                        case R.id.action_delete:
                            removeReceipts(tmp);
                            actionMode.finish(); // Action picked, so close the CAB
                            return true;
                        default:
                            return false;
                    }
                }

                @Override
                public void onDestroyActionMode(android.view.ActionMode actionMode) {

                }
            });

Answer 1

原来实际触发操作菜单，你必须在gridview上调用setItemChecked，所以我只是在longpress上的容器视图中执行此操作

holder.container.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                if (ma.mActionMode == null) {


                    // the line that triggers it  
                    ma.receiptGridView.setItemChecked(position, true);


                    v.setBackgroundResource(b ? R.color.color_ce5a5a : R.drawable.receipt_item_bg);
                    view.setBackgroundColor(Color.parseColor("#ce5a5a"));
                }
                return false;
            }
        });

onCreateActionMode没有在GridView长按上调用？

1 个答案: