Android RelativeLayout 以编程方式设置“centerInParent"

问题描述

我有一个像这样的 RelativeLayout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dip">

    <Button
        android:id="@+id/negativeButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20dip"
        android:textColor="#ffffff"
        android:layout_alignParentLeft="true"
        android:background="@drawable/black_menu_button"
        android:layout_marginLeft="5dip"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"/>

    <Button
        android:id="@+id/positiveButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20dip"
        android:textColor="#ffffff"
        android:layout_alignParentRight="true"
        android:background="@drawable/blue_menu_button"
        android:layout_marginRight="5dip"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"/>
</RelativeLayout>

我希望能够以编程方式为 positiveButton 设置与以下相同的效果:

I want to be able to programatically set for positiveButton the same effect as:

android:layout_centerInParent="true"

我怎样才能以编程方式做到这一点?

How can I make this programatically ?

推荐答案

完全未经测试，但这应该有效:

Completely untested, but this should work:

View positiveButton = findViewById(R.id.positiveButton);
RelativeLayout.LayoutParams layoutParams =
    (RelativeLayout.LayoutParams)positiveButton.getLayoutParams();
layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
positiveButton.setLayoutParams(layoutParams);

在清单中的活动中添加 android:configChanges="orientation|screenSize"

add android:configChanges="orientation|screenSize" inside your activity in your manifest

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