Android RelativeLayout以编程方式设置；centerInParent“；

我有一个这样的亲戚：

<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>

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如何通过编程实现这一点？

完全未经测试，但这应该可以：

---

添加

android:configChanges=“orientation | screenSize”

在清单中的活动中

为了从鲁本响应中添加另一种味道，我使用它来根据条件添加或删除此规则：

    RelativeLayout.LayoutParams layoutParams =
            (RelativeLayout.LayoutParams) holder.txtGuestName.getLayoutParams();

    if (SOMETHING_THAT_WOULD_LIKE_YOU_TO_CHECK) {
        // if true center text:
        layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
        holder.txtGuestName.setLayoutParams(layoutParams);
    } else {
        // if false remove center:
        layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT, 0);
        holder.txtGuestName.setLayoutParams(layoutParams);
    }

我已经做了1年了。中心家长2。中心水平3。中心垂直，带有true和false

private void addOrRemoveProperty(View view, int property, boolean flag){
    RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
    if(flag){
        layoutParams.addRule(property);
    }else {
        layoutParams.removeRule(property);
    }
    view.setLayoutParams(layoutParams);
}

如何调用方法：

centerInParent-正确

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, false);

centerInParent-错误

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, false);

中心水平-正确

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, false);

中心水平-错误

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, false);

中心垂直-正确

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, false);

中心垂直-错误

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, false);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, true);

addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, false);

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希望这能对您有所帮助。

有效，但只有在I indertet layoutParams.addRule（RelativeLayout.ALIGN_PARENT_RIGHT，0）之后才有效；在父规则中居中之前。谢谢。我想补充一点，这也适用于我，但我必须更改layoutParams.addRule（PARENT中的RelativeLayout.CENTER，0）；到layoutParams.addRule（父级中的RelativeLayout.CENTER\u，-1）；在我的情况下。您的应用程序可能需要“锚定”字段中的其他值。锚定字段值可以是0以外的任何值，以表示当前为真。源代码具有类似于

if的比较（规则[CENTER_IN_PARENT]！=0 | |规则[CENTER_HORIZONTAL]！=0）{

其中

0

有效地计算为

false

，作为后续问题，是否有人知道此答案中的代码是否可用于动画？例如，从相对左偏移到中心位置等动画图像。您可以简单地使用layoutParams.addRule（RelativeLayout.CENTER\u in\u PARENT），不需要第二个参数，因为您可以选择删除规则的最佳方法：layoutParams.RemoveUle（RelativeLayout.CENTER\u in\u PARENT）；