如何设置波及效应上的LinearLayout编程？ [英] How to set Ripple effect on a LinearLayout programmatically?

问题描述

我想背景 android.R.attr.selectableItemBackground 设置为的LinearLayout 。当使用XML没有问题（它的工作原理）

I want to set the background android.R.attr.selectableItemBackground to a LinearLayout. When using XML there are no problems (it works)

<LinearLayout
    android:id="@+id/llMiner"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?android:attr/selectableItemBackground"
    android:clickable="true" >

...但我必须这样做在Java code，所以我已经试过这

... but I have to do this in java code, so I've tried this

llMiner.setClickable(true);
llMiner.setBackgroundResource(android.R.attr.selectableItemBackground);

...它不工作，事实上我得到一个 NotFoundException 在这第二行。
所以，我已经试过之后这个变种认为资源是颜色。

... and it doesn't work, infact I get a NotFoundException on this second line. So after I've tried this variant thinking that the resource is a Color.

llMiner.setClickable(true);
llMiner.setBackgroundColor(android.R.attr.selectableItemBackground);

这一个不发动例外，但是......不工作（有没有背景的变化时pressing，但在pssed，因为它需要做的$ P $状态变化）...任何建议？

This one doesn't launch exception, but... doesn't work (there are no changing of background when pressing, but the state change in pressed as it have to do)... any suggestion?

推荐答案

您可以使用此方法。

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
    // If we're running on Honeycomb or newer, then we can use the Theme's
    // selectableItemBackground to ensure that the View has a pressed state
    TypedValue outValue = new TypedValue();
    getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground, outValue, true);
    textView.setBackgroundResource(outValue.resourceId);
}

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