如何以编程方式将selectableItemBackground添加到ImageButton？

问题描述

android.R.attr.selectableItemBackground存在，但是如何将它编程添加到ImageButton？

android.R.attr.selectableItemBackground exists, but how do I add it programatically to an ImageButton?

另外，如何在文档中找到答案？ 中提到，但我没有看到任何解释它实际上被使用。实际上，我很少会发现文档很有用，但我希望这是我的错，而不是文档。

Also, how would I go about finding the answer in the documentation? It's mentioned here, but I don't see any explanation of how it's actually used. Actually, I rarely seem to find the documentation useful, but I'm hoping that's my fault and not that of the documentation.

推荐答案

这里是一个使用答案的示例：

Here is an example using answer here: How to get the attr reference in code?

    // Create an array of the attributes we want to resolve
    // using values from a theme
    // android.R.attr.selectableItemBackground requires API LEVEL 11
    int[] attrs = new int[] { android.R.attr.selectableItemBackground /* index 0 */};

    // Obtain the styled attributes. 'themedContext' is a context with a
    // theme, typically the current Activity (i.e. 'this')
    TypedArray ta = obtainStyledAttributes(attrs);

    // Now get the value of the 'listItemBackground' attribute that was
    // set in the theme used in 'themedContext'. The parameter is the index
    // of the attribute in the 'attrs' array. The returned Drawable
    // is what you are after
    Drawable drawableFromTheme = ta.getDrawable(0 /* index */);

    // Finally free resources used by TypedArray
    ta.recycle();

    // setBackground(Drawable) requires API LEVEL 16,
    // otherwise you have to use deprecated setBackgroundDrawable(Drawable) method.
    imageButton.setBackground(drawableFromTheme);
    // imageButton.setBackgroundDrawable(drawableFromTheme);

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