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.LayoutParamscolumnParams= (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);

}