ExpandableListView - 是有条件的扩张可能吗？ [英] ExpandableListView - Is conditional expansion possible?

问题描述

我有绑定到一个SQLite数据库的ExpandableListView。为简单起见，让我们假设该数据库包含两列：标题和体。在ExpandableListView，有一个组每个标题和孩子每个相应的体。

I have an ExpandableListView bound to a SQLite database. To simplify things, lets assume the database contains two columns: title and body. In the ExpandableListView, there is a group for each title, and a childfor each corresponding body.

现在让事情变得更有趣，有的在SQLite数据库中的行不具有体（即......他们只有一个标题）。正如你所看到的，如果没有身体，那么没有理由展开组...因为孩子将是空的（即字符串体== ）。

Now to make things more interesting, some of the rows in the SQLite database do not have a body (that is... they only have a title). As you can see, if there is no body, then there is no reason to expand the group... because the child will be empty (i.e. String body == "").

我在寻找一个办法赶上这样的情况下，并跳过该集团的扩张。我不想要一个空白的孩子进行扩展。把它放在伪code，我想是这样的：

I'm searching for a way to catch a situation like this, and skip the group's expansion. I don't want a blank child to be expanded. To put it in psuedo code, I want something like this:

if (body.getText() == "") {
  //DO NOT EXPAND
  //DO OTHER STUFF
}

有什么建议？

推荐答案

诀窍是在OnGroupClickListener。下面code 768,16工作。把在您的ExpandableListActivity onCreate方法的结束。

The trick is in the OnGroupClickListener. The following code shoud work. Put at the end of your onCreate method for the ExpandableListActivity.

lv.setOnGroupClickListener(new OnGroupClickListener() {

  @Override
  public boolean onGroupClick(ExpandableListView parent, View v,
      int groupPosition, long id) {

    Cursor c = mDbHelper.fetchRow(id); //Get Title & body from SQLite table
    if (c.getString(Constants.bodyColumn).equals("")) {
      //If the body returned from SQLite is empty, return true
      return true; //True means the click HAS been handled.
    }
    return false; //Click has not been handled, so let Android expand here.
  }
});

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