Android的RelativeLayout以编程方式设置centerInParent

我有一个像这样的相关布局：

<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> 

我希望能够编程设置为positiveButton相同的效果：

 android:layout_centerInParent="true" 

我怎样才能编程？

Answer 1

完全未经testing，但这应该工作：

 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"

Answer 2

只是为了从Reuben响应中添加另一种风格，我使用这种方式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); } 

Answer 3

我已经做了

1. centerInParent

2.中心水平

3.中心垂直

真假 。

 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 – true

 addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, true); 

centerInParent – false

 addOrRemoveProperty(mView, RelativeLayout.CENTER_IN_PARENT, false); 

centerHorizo​​ntal – true

 addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, true); 

centerHorizo​​ntal – false

 addOrRemoveProperty(mView, RelativeLayout.CENTER_HORIZONTAL, false); 

centerVertical – true

 addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, true); 

centerVertical – false

 addOrRemoveProperty(mView, RelativeLayout.CENTER_VERTICAL, false); 

希望这会帮助你。