Android Studio无法解析方法addRule（）

Question

ViewGroup.LayoutParams layoutParams = new RelativeLayout.LayoutParams(containerWidth, fragmentHeight);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);

我得到：错误：找不到符号方法addRule（int）

Android Studio v 0.4.5

Answer 1

因为您使用了ViewGroup.LayoutParams

ViewGroup.LayoutParams layoutParams = new RelativeLayout.LayoutParams(containerWidth, fragmentHeight);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);

但 addRule 方法在实现的子类RelativeLayout.LayoutParams中，所以您可能想要使用：

RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(containerWidth, fragmentHeight);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);

请参阅documentation of RelativeLayout.LayoutParams here

Answer 2

应该是

RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(containerWidth, fragmentHeight);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);