Ellipsize不能正常工作了多行的TextView与任意最大高度 [英] Ellipsize not working properly for a multiline TextView with an arbitrary maximum height

问题描述

我有一个的TextView 与未知的最大高度，这取决于设备的DPI /屏幕分辨率。所以，举例来说，上和MDPI装置这个最大高度使得能够在一个时间只显示2行，可以提高到一个未定义数的值。

I have a TextView with an unknown maximum height, which is dependent on the device's DPI/screen resolution. So, for instance, on and MDPI device this maximum height makes it possible to show only 2 lines at a time, a value that can be increased up to an undefined number.

我的问题是有关与ellipsize功能。让我们假设目标设备允许要显示4行。如果我手动设置的行的最大数目，像这样...

My issue is related with the ellipsize functionality. Let's suppose that a certain device allows for 4 lines to be displayed. If I manually set the maximum number of lines, like this...

<TextView
    android:id="@+id/some_id"
    android:layout_width="fill_parent"
    android:layout_height="0dip"
    android:ellipsize="end" 
    android:maxLines="4"
    android:singleLine="false"
    android:layout_weight="1"
    android:gravity="center_vertical"
    android:text="This is some really really really really really long text"
    android:textSize="15sp" />

...一切正常确定。如果文本不适合正常，则省略号被添加在第四行的末尾，这样的：

...everything works OK. If the text doesn't fit properly, then the ellipsis are added at the end of the fourth line, like this:

This is some
really really
really really
really long...

但我宁愿的没有的设定的行数作为一个静态变量，因为我想preFER以包括DPI /屏幕分辨率的任意组合的支持。所以，如果我删除 MAXLINES 省略号不再正确显示在四个行，反而显示不完整的文字部分：

But I'd rather not set the number of lines as a static variable, as I would prefer to include support for any combination of DPI/screen resolution. So if I remove maxLines the ellipsis is no longer correctly shown at line four, showing instead an incomplete portion of text:

This is some
really really
really really
really long

如果我稍微增加的TextView 尺寸，我可以看到一个正在绘制的文本的其他部分隐藏在其他浏览。设置变量了maxHeight 似乎并没有擦出火花。

If I slightly increase the TextView size, I can see that the rest of the text is still being drawn "behind" the other Views. Setting the variable maxHeight doesn't seem to work either.

我仿佛真的无法找到针对此问题的解决方案。有任何想法吗？如果有帮助，我唯一的工作与Android V4.0.3及以上（API等级15）。

I really can't seem to find a solution for this issue. Any ideas? If it helps, I'm working only with Android v4.0.3 and up (API level 15).

推荐答案

计算有多少行融入的TextView 与的TextView＃的getHeight（） 和的TextView＃getLineHeight（）。然后调用的TextView＃setMaxLines（）。

Calculate how many lines fit into the TextView with TextView#getHeight() and TextView#getLineHeight(). Then call TextView#setMaxLines().

ViewTreeObserver observer = textView.getViewTreeObserver();
observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        int maxLines = (int) textView.getHeight()
                / textView.getLineHeight();
        textView.setMaxLines(maxLines);
        textView.getViewTreeObserver().removeGlobalOnLayoutListener(
                this);
    }
});

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