0

我希望能够长按 ListView 单元格，以便弹出一个 AlertDialog 并让我删除 ListView 中的一行。但是，长按不注册。我什至尝试设置

 userChatroomListView.setLongClickable(true)

下面是代码。

 userChatroomListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
            AlertDialog.Builder adb = new AlertDialog.Builder(UserInfoActivity.this);
            final String roomName = ((TextView) view).getText().toString();
            adb.setTitle("Delete?");
            adb.setMessage("Are you sure you want to delete " + roomName);
            final int positionToRemove = i;
            adb.setNegativeButton("No", null);
            adb.setPositiveButton("Yes", new AlertDialog.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    userChatrooms.remove(positionToRemove);
                    userRoomsRef.child(roomName).removeValue();
                    BaseAdapter adapter = (BaseAdapter) userChatroomListView.getAdapter();
                    adapter.notifyDataSetChanged();
                }
            });
            return false;
        }

并且在 xml 中也这样做了。现在我该怎么做？

这是xml代码：

<ListView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/ChatroomListTextView"
    android:layout_alignParentBottom="true"
    android:id="@+id/userChatroomsListView"
    android:background="#29dcc4"
    android:longClickable="true"
    >
</ListView>
4

2 回答 2

1

我相信您的问题是您没有显示对话框。

您需要adb.show()在设置onclick侦听器之后和返回之前添加。

        userChatroomListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
            AlertDialog.Builder adb = new AlertDialog.Builder(UserInfoActivity.this);
            final String roomName = ((TextView) view).getText().toString();
            adb.setTitle("Delete?");
            adb.setMessage("Are you sure you want to delete " + roomName);
            final int positionToRemove = i;
            adb.setNegativeButton("No", null);
            adb.setPositiveButton("Yes", new AlertDialog.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    userChatrooms.remove(positionToRemove);
                    userRoomsRef.child(roomName).removeValue();
                    BaseAdapter adapter = (BaseAdapter) userChatroomListView.getAdapter();
                    adapter.notifyDataSetChanged();
                }
            });
            adb.show();
            return false;
    }
于 2016-06-04T04:30:29.827 回答
0

与问题本身无关，但如果您有同样的问题，请检查您使用的是OnItemLongClickListener不是setOnLongClickListener.

于 2020-07-30T15:09:25.997 回答