如何以编程方式设置相对布局按钮的layout_align_parent_right属性？ [英] How to programmatically set the layout_align_parent_right attribute of a Button in Relative Layout?

问题描述

您好！ 我有我创建一个编程相对布局：

HI! I have a relative layout which I am creating programmatically:

 RelativeLayout layout = new RelativeLayout( this );
    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,
            LayoutParams.WRAP_CONTENT);

现在我有两个按钮，我想在这个相对布局添加。但问题是两个按钮被显示在上彼此RelatiiveLayout重叠的左侧。

Now I have two buttons which I want to add in this relative layout. But the problem is both buttons are being shown on the left of the RelatiiveLayout overlapping on each other.

buttonContainer.addView(btn1);
buttonContainer.addView(btn2);

现在我想知道我怎么可以编程设置的安卓layout_alignParentRight =真 或安卓？layout_toLeftOf =@ ID / BTN按钮属性，因为我们做的XML

Now I want to know how can I programmatically set the the android:layout_alignParentRight="true" or android:layout_toLeftOf="@id/btn" attribute of buttons as we do in the xml?

问候 FAS

推荐答案

您可以访问任何的LayoutParams 使用code View.getLayoutParams 。你一定要非常清楚什么的LayoutParams 您的访问。这通常是通过检查获得的含的ViewGroup 如果它有一个的LayoutParams 内在小孩那么这就是你应该使用的。你的情况是 RelativeLayout.LayoutParams 。您将使用<一个href="http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html#addRule%28int%29"><$c$c>RelativeLayout.LayoutParams#addRule(int动词） 和<一href="http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html#addRule%28int%2C%20int%29"><$c$c>RelativeLayout.LayoutParams#addRule(int动词，诠释锚）

You can access any LayoutParams from code using View.getLayoutParams. You just have to be very aware of what LayoutParams your accessing. This is normally achieved by checking the containing ViewGroup if it has a LayoutParams inner child then that's the one you should use. In your case it's RelativeLayout.LayoutParams. You'll be using RelativeLayout.LayoutParams#addRule(int verb) and RelativeLayout.LayoutParams#addRule(int verb, int anchor)

您可以通过code得到它：

You can get to it via code:

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)button.getLayoutParams();
params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
params.addRule(RelativeLayout.LEFT_OF, R.id.id_to_be_left_of);

button.setLayoutParams(params); //causes layout update

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