Several knowledge points derived from the home page interface (4)

Java List Copy: Shallow and Deep Copy

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

Summary of the copy method of List collection

Description: Copying a collection by means of new ArrayList<T>(List<T> srcList) creates a separate memory space, and the content is the same as that of the source collection. Modifications to the new collection do not affect the source collection.

Layout a and then b, can you use code to dynamically modify a on b?

When setting the control layout:

[javascript] view plaincopy    

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

Method 1: addRule(int verb)

[javascript] view plaincopy    

1. leftTxtParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);  

Method 2: addRule(int verb, int anchor)

[javascript] view plaincopy    

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

The second parameter here is the control ID. You can click to view the control ID: android sets the ID and setId() exception for the new control in the code

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) ;

}