Android GridView and ScrollView nesting

From answering the channel answer, so the content is based on the original layout of the answer channel

1. layout file as follows

File name: Testxm.xml

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= "http://schemas.android.com/apk/res/    Android "Android:layout_width=" Match_parent "android:layout_height=" match_parent "android:background=" #f1f1f1 " android:orientation= "Vertical" > <!--Top Blue toolbar--<relativelayout android:id= "@+id/fujin_top_lla        Yout "android:layout_width=" fill_parent "android:layout_height=" 36DP "android:background=" #47a9d0 " Android:gravity= "center_vertical" android:orientation= "Horizontal" > <textview Android : id= "@+id/fujin_top_llayout_lessthan" android:layout_width= "wrap_content" android:layout_height= "30d P "android:layout_alignparentleft=" true "android:layout_marginleft=" 10dip "Android:paddin             gleft= "10DP" android:text= "1111"/> <textview android:id= "@+id/fujin_top_llayout_fujin" Android:layout_width= "WRap_content "android:layout_height=" 30DP "android:layout_torightof=" @+id/fujin_top_llayout_lessthan " android:paddingleft= "10DP" android:paddingtop= "3DP" android:text= "222" Androi D:textcolor= "#fff" android:textsize= "16sp"/> <textview android:id= "@+id/fujin_top_llay Out_dingwei "android:layout_width=" 70DP "android:layout_height=" 30DP "Android:layout_tole ftof= "@+id/fujin_top_llayout_search" android:text= "33333"/> <textview android:id= "@+id            /fujin_top_llayout_search "android:layout_width=" wrap_content "android:layout_height=" 30DP " Android:layout_alignparentright= "true" android:paddingright= "12DP" android:text= "44444"/> & lt;/relativelayout> <!--top Blue toolbar ends--<scrollview android:layout_width= "Match_parent" and roid:layout_height= "Wrap_content "android:fillviewport=" true "android:layout_weight=" 1 "android:scrollbars=" vertical ">            <linearlayout android:layout_width= "match_parent" android:layout_height= "Wrap_content" android:orientation= "Vertical" > <!--title--<relativelayout and Roid:id= "@+id/fenlei_title_rl" android:layout_width= "Match_parent" android:layout_height= "28 DP "android:layout_marginleft=" 15DP "android:layout_marginright=" 15DP "Androi                    d:layout_margintop= "20DP" > <textview android:id= "@+id/fenlei_title_tv" Android:layout_width= "Match_parent" android:layout_height= "Match_parent" an droid:gravity= "center" android:text= "title" android:textsize= "15sp"/> &L   T;/relativelayout>         <!--Title_over-<!--btnlist-<linearlayout Android:id = "@+id/fujin_btnlist_tl" android:layout_width= "match_parent" android:layout_height= "Wrap_con Tent "android:layout_margintop=" 15DP "android:orientation=" Vertical "Android:        Scrollbaralwaysdrawverticaltrack= "true" > </LinearLayout> <!--btnlist_over-- </LinearLayout> </ScrollView></LinearLayout>

2, the GridView item layout file

<?xml version= "1.0" encoding= "Utf-8"? ><relativelayout          xmlns:android= "http://schemas.android.com/apk /res/android "          android:layout_height=" wrap_content "          android:paddingbottom=" 4dip "android:layout_width=" Fill_parent ">         <textview                android:layout_width=" wrap_content "                android:layout_below=" @+id/ Itemimage "                android:layout_height=" wrap_content "                android:text=" TextView01 "                android:layout_ Centerhorizontal= "true"                android:id= "@+id/itemtext" >         </TextView></RelativeLayout>

3. Activity Code

public class Porterduffactivity extends activity{private portercanvas Mportercanvas = null;private GridView GridView; Private linearlayout ll;public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.LAYOUT.TESTXM); This.addview ();} private void AddView () {for (int i=1; i<=35;i++) {ll= (linearlayout) Findviewbyid (r.id.fujin_btnlist_tl            );        This.addtwoclassify (i); }}private void makegridview (int num) {arraylist
4. MyGridView Code
public class MyGridView extends gridview{private Boolean needscrollbar = false;   Sets whether there is a scrollbar, which should be set to false when it is to be displayed in Scollview. Otherwise true public      MyGridView (context context) {           super (context);       }       Public MyGridView (context context, AttributeSet Attrs) {           Super (context, attrs);       }       Public MyGridView (context context, AttributeSet attrs, int defstyle) {           Super (context, attrs, Defstyle);       }           @Override       protected void onmeasure (int widthmeasurespec, int heightmeasurespec) {           if (!needscrollbar) {               int expandspec = Measurespec.makemeasurespec (integer.max_value >> 2, measurespec.at_most);               Super.onmeasure (Widthmeasurespec, Expandspec);           } else {               super.onmeasure (Widthmeasurespec, Heightmeasurespec);}}}   


Summarize:
Because the ScrollView and GridView have layout conflicts, if the outer layer is nested with ScrollView, the GridView cannot display full if it does not specify a fixed height. The ListView also has this problem.
But in fact, for this to the problem, I think the use of LinearLayout equal layout is also possible, vertical layout can be added down, so as to avoid the conflict with the ScrollView. But primarily because the GridView is a packaged component, using the GridView can simplify some of the work, but it also increases the burden of layout refreshes (although it is not generally possible to consider)
Android GridView and ScrollView nesting