如何以编程方式在LinearLayout上设置波纹效果？

您可以使用这种方式。

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();    this.getTheme().resolveAttribute(android.R.attr.selectableItemBackground, outValue, true);    textView.setBackgroundResource(outValue.resourceId);}