我如何添加selectableItemBackground到的ImageButton编程？ [英] How do I add selectableItemBackground to an ImageButton programatically?

问题描述

android.R.attr.selectableItemBackground存在，但我怎么编程把它添加到一个ImageButton的？

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

另外，我怎么会去寻找答案的文档中？它提到这里，但我没有看到它是如何实际使用任何解释。其实，我似乎很少发现的文件是有用的，但我希望这是我的错，而不是该文档。

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

下面是一个例子使用的答案在这里：的如何获得在code中的ATTR参考？​​

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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