由主页界面引出的几个知识点(四)

java List复制：浅拷贝与深拷贝

http://blog.csdn.net/demonliuhui/article/details/54572908

List集合的复制方式小结

说明：通过new ArrayList<T>(List<T> srcList)的方式复制一个集合，是单独开辟了一个内存空间，并且内容跟源集合的内容一样。对新集合的修改并不影响源集合。

布局a再b下，能用代码动态修改为a在b上吗

设置控件布局时：

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1. LayoutParams leftTxtParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);  

方法一：addRule(int verb)

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1. leftTxtParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);  

方法二：addRule(int verb, int anchor)

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1. leftTxtParams.addRule(RelativeLayout.END_OF, img_left.getId());  

此处第二个参数是控件ID，有关控件ID可以点击查看： android在代码中为new出的控件设置ID及setId()异常

https://www.cnblogs.com/Annoying/p/5402339.html

<RelativeLayout

android :id= "@+id/ll_tab_layout_container"

android :layout_width= "match_parent"

android :layout_height= "match_parent"

android :fillViewport= "true"

app :layout_behavior= "@string/appbar_scrolling_view_behavior" >

<android.support.v7. widget .CardView

android :id= "@+id/card_column"

style= "@style/home_card_style"

android :layout_alignParentTop= "true"

android :layout_width= "match_parent"

android :layout_height= "wrap_content"

android :layout_marginBottom= "7dp"

android :layout_marginTop= "5dp" >

<RelativeLayout

android :layout_width= "match_parent"

android :layout_height= "match_parent"

android :orientation= "vertical" >

<com.dx168.efsmobile.me.widget.HomeCardTitleLayout

android :id= "@+id/column_more"

android :layout_width= "match_parent"

android :layout_height= "wrap_content"

app :contentIcon= "@drawable/hundreds_icon"

app :contentText= "百家专栏"

app :rightIcon= "@drawable/home_right_more_arrow"

app :rightText= "查看更多" />

<FrameLayout

android :id= "@+id/cloumn_fragment"

android :layout_width= "match_parent"

android :layout_height= "match_parent"

android :layout_below= "@+id/column_more" />

</RelativeLayout>

</android.support.v7. widget .CardView>

<android.support.v7. widget .CardView

android :id= "@id/card_image"

style= "@style/home_card_style"

android :layout_width= "match_parent"

android :layout_height= "wrap_content"

android :layout_below= "@id/card_column"

android :layout_marginBottom= "7dp"

android :layout_marginTop= "5dp" >

<ImageView

android :id= "@+id/personal"

android :layout_width= "match_parent"

android :layout_height= "72dp"

android :scaleType= "fitXY" />

</android.support.v7. widget .CardView>

<FrameLayout

android :id= "@+id/fl_live_container_bottom"

android :layout_below= "@id/card_image"

android :layout_width= "match_parent"

android :layout_height= "wrap_content" />

</RelativeLayout>

if (isActiveUser){

RelativeLayout.LayoutParams imgParams = (RelativeLayout.LayoutParams) mImgCardView .getLayoutParams() ;

imgParams.addRule(RelativeLayout. BELOW , 0 ) ;

imgParams.addRule(RelativeLayout. ALIGN_PARENT_TOP ) ;

mImgCardView .setLayoutParams(imgParams) ;

RelativeLayout.LayoutParams columnParams = (RelativeLayout.LayoutParams) mlColumnCardView .getLayoutParams() ;

columnParams.addRule(RelativeLayout. ALIGN_PARENT_TOP , 0 ) ;

columnParams.addRule(RelativeLayout. BELOW , mImgCardView .getId()) ; //or params

mlColumnCardView .setLayoutParams(columnParams) ;

} else {

RelativeLayout.LayoutParams columnParams = (RelativeLayout.LayoutParams) mlColumnCardView .getLayoutParams() ;

columnParams .addRule(RelativeLayout. BELOW , 0 ) ;

columnParams .addRule(RelativeLayout. ALIGN_PARENT_TOP ) ;

mlColumnCardView .setLayoutParams( columnParams ) ;

RelativeLayout.LayoutParams imgParams = (RelativeLayout.LayoutParams) mImgCardView .getLayoutParams() ;

imgParams.addRule(RelativeLayout. ALIGN_PARENT_TOP , 0 ) ;

imgParams.addRule(RelativeLayout. BELOW , mlColumnCardView .getId()) ;

mImgCardView .setLayoutParams(imgParams) ;

}