可检查视图中的 setChecked() 方法每次扰乱布局时都会触发两次

Question

我当时正在 Cal Poly lab3 (http://sites.google.com/site/androidappcourse/labs/lab-3) 上工作，一切都按预期进行，直到我在扩展和折叠项目上实现了可检查的界面。然后，我的逻辑似乎是正确的（因为展开按钮文本仍在按其应有的方式变化） - 但布局没有正确重绘 - 就像它在应该展开时折叠起来并且看起来已损坏一样。

在玩了一下日志记录后，我发现每次我单击任何项​​目时，setChecked() 方法都会在很短的时间跨度内对每个项目调用两次 - 这会扰乱绘图。第一次使用旧的选择数据 - 然后使用新的选择数据。

更奇怪的是，我设法通过设置 setChecked() 每隔一段时间触发来解决这个问题：

public void setChecked(boolean checked) 
{
    counter++;
    if (counter%2==0)
    {
        if(checked) expandJokeView();
        else collapseJokeView();
    }
    Log.d("SimpleJokeListLog", "SetChecked"+" "+checked+" "+counter+" "+m_joke.toString());

}

这是它在目录中的样子： 我开始活动，在我的自定义 JokeView 中显示项目列表，实现可检查，

12-18 02:58:16.598: D/SimpleJokeListLog(742): SetChecked false 1 A small
12-18 02:58:16.628: D/SimpleJokeListLog(742): SetChecked false 1 Cartoonist
12-18 02:58:16.648: D/SimpleJokeListLog(742): SetChecked false 1 I wonde
12-18 02:58:16.728: D/SimpleJokeListLog(742): SetChecked false 2 A small
12-18 02:58:16.748: D/SimpleJokeListLog(742): SetChecked false 2 Cartoonist
12-18 02:58:16.748: D/SimpleJokeListLog(742): SetChecked false 2 I wondere

我选择第一个项目（一个小...），

12-18 02:59:17.628: D/SimpleJokeListLog(742): SetChecked false 3 A small 
12-18 02:59:17.628: D/SimpleJokeListLog(742): SetChecked false 3 Cartoonis
12-18 02:59:17.628: D/SimpleJokeListLog(742): SetChecked false 3 I wondere
12-18 02:59:17.838: D/SimpleJokeListLog(742): SetChecked true 4 A small boy
12-18 02:59:17.847: D/SimpleJokeListLog(742): SetChecked false 4 Cartoonist
12-18 02:59:17.858: D/SimpleJokeListLog(742): SetChecked false 4 I wondered

我选择第二个

12-18 02:59:24.768: D/SimpleJokeListLog(742): SetChecked true 5 A small boy 
12-18 02:59:24.768: D/SimpleJokeListLog(742): SetChecked false 5 Cartoonist 
12-18 02:59:24.768: D/SimpleJokeListLog(742): SetChecked false 5 I wondered w
12-18 02:59:24.968: D/SimpleJokeListLog(742): SetChecked false 6 A small
12-18 02:59:24.968: D/SimpleJokeListLog(742): SetChecked true 6 Cartooni
12-18 02:59:24.978: D/SimpleJokeListLog(742): SetChecked false 6 I wonde

，第三个

12-18 02:59:27.828: D/SimpleJokeListLog(742): SetChecked false 7 A small
12-18 02:59:27.838: D/SimpleJokeListLog(742): SetChecked true 7 Cartoonis
12-18 02:59:27.838: D/SimpleJokeListLog(742): SetChecked false 7 I wonder
12-18 02:59:28.048: D/SimpleJokeListLog(742): SetChecked false 8 A small 
12-18 02:59:28.058: D/SimpleJokeListLog(742): SetChecked false 8 Cartooni
12-18 02:59:28.068: D/SimpleJokeListLog(742): SetChecked true 8 I wondered

，再次第三个（即使这次没有这个计数器，它也无法正确绘制）：

12-18 02:59:31.197: D/SimpleJokeListLog(742): SetChecked false 9 A small b
12-18 02:59:31.197: D/SimpleJokeListLog(742): SetChecked false 9 Cartoonist
12-18 02:59:31.197: D/SimpleJokeListLog(742): SetChecked true 9 I wondered 
12-18 02:59:31.417: D/SimpleJokeListLog(742): SetChecked false 10 A small bo
12-18 02:59:31.417: D/SimpleJokeListLog(742): SetChecked false 10 Cartoonist f
12-18 02:59:31.427: D/SimpleJokeListLog(742): SetChecked true 10 I wondered why

Answer 1

我在这个问题上被困了三四个小时，最后我尝试从扩展和折叠方法中删除 setChecked() 调用（不记得为什么我把它们放在那里......）。也许它对你有帮助，这是我的代码片段：

private void collapseRow() {
    mText.setMaxLines(2);
    mText.setEllipsize(TruncateAt.MARQUEE);
    mExpand.setText(COllAPS);
    mWiki.setVisibility(GONE);
    requestLayout();
    state = COLLAPSED;


}
private void expandRow() {
    mText.setMaxLines(Integer.MAX_VALUE);
    mText.setEllipsize(null);
    mExpand.setText(EXPAND);
    mWiki.setVisibility(VISIBLE);
    requestLayout();
    state = EXPANDED;

}
private void setData() {
    mText.setText(mItem.getDate());
}

@Override
public boolean isChecked() {
        Log.d("isChecked", "!!!!!!!");
        return mChecked;

}

@Override
public void setChecked(boolean state) {
    count++;

    if (state)
        expandRow();
    else
        collapseRow();

    Log.d("setChecked", ""+ state + "" + count);
}

@Override
public void toggle() {
    Log.d("toggle", "!!!!!!!");
    setChecked(!mChecked);

}

现在，一切都完美地工作：没有多次调用 setChecked，并且 ListItems 像他们应该的那样打开和关闭。