获取 ListView 可绘制对象并手动应用

发布于 2024-12-03 20:00:22 字数 922 浏览 0 评论 0原文

我正在尝试将列表项在选择时所具有的样式应用于视图（在我的例子中是 TextView）

这里是橙色绘制的样式。我发现这个外观是由可绘制对象定义的。所以我尝试了，获取可绘制对象并将其应用到我的视图中，

TextView tv = new TextView(this);     

tv.setText("Hello, Android");
tv.setBackgroundDrawable(new ListView(this).getSelector());
setContentView(tv);

但它不起作用。有人知道如何做到这一点吗？

好吧，我知道该怎么做了。我发现 ListView 使用在 android.R.drawable 中定义的 ColorStateList list_selector_background 。使用 ResourceBrowser 我知道第四种颜色是选定的可绘制对象，因此我将以下内容添加到我的代码中

StateListDrawable listDrawables= (StateListDrawable)getResources().getDrawable(android.R.drawable.list_selector_background);
listDrawables.selectDrawable(3);
Drawable highlightDrawable = listDrawables.getCurrent();

现在我可以使用 higlightDrawable 设置背景。我不知道是否可以访问 xml 中的可绘制对象，我还没有尝试过。感谢您的帮助！

原文

i am trying to apply the style that a list item has, when it is selected, to a View (In my case a TextView)

Example

here it would be the orange-painted style. I found that this look is defined by a Drawable Object. So i tried, so get the drawable and applied it to my view

TextView tv = new TextView(this);     

tv.setText("Hello, Android");
tv.setBackgroundDrawable(new ListView(this).getSelector());
setContentView(tv);

but it doesn't work.
Does anybody have an idea how to do that?

Ok I figured out how to do that. I found out hat ListView uses the ColorStateList list_selector_background which is defined in android.R.drawable. Using ResourceBrowser I got to know that the fourth color is the selected drawable so i added the following to my code

StateListDrawable listDrawables= (StateListDrawable)getResources().getDrawable(android.R.drawable.list_selector_background);
listDrawables.selectDrawable(3);
Drawable highlightDrawable = listDrawables.getCurrent();

Now I can set my Background using higlightDrawable. I don't know if it is possible to access the drawable in xml I did not try it yet. Thanks for help!

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