Advanced Controls "Android 5"--listactivity

Use of listactivity

A ListView control is integrated in the Listactivity class.

By inheriting the Listactivity class, you can easily use the ListView control

1  Public classclass Name extends Listactivity {2     protected voidonCreate (Bundle savedinstancestate) {3         Super. OnCreate (savedinstancestate);4         //gets the array in the resource file5String [] Data=getresources (). Getstringarray (r.array.city);6Arrayadapter<string> adapter=NewArrayadapter<string> ( This,7Android. R.layout.simple_list_item_multiple_choice,data);//style is a check box8 Setlistadapter (adapter);9ListView Listview=getlistview ();//Gets the ListView object that listactivity comes withTen         //to set the selection behavior of a listview: Check One Listview.setchoicemode (listview.choice_mode_multiple); A     } -}

part of the code that applies listactivityGrid list GridView (displays information by multiple rows and columns)

Method	Property	Describe
Public GridView (Context context)		Create a GridView Object
public void Setstretchmode (int stretchmode)	Android:stretchmode	Zoom mode
public void setverticalspacing (int verticalspacing)	Android:verticalspacing	Set Vertical Spacing
public void sethorizontalspacing (int horizontalspacing)	Android:horizontalspacing	Set Horizontal Spacing
public void setnumcolumns (int numcolumns)	Android:numcolumns	Sets the amount of data to display per column, and if set to Auto--fit, indicates the automatic setting
public void setselection (int position)		Set the default check
public void setgravity (int gravity)	Android:gravity	Sets the alignment mode, specified by the Grivity class
public void Setadapter (ListAdapter adapter)		Set up a picture set

<LinearLayoutAndroid:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"><ImageViewAndroid:id= "@+id/img"Android:layout_width= "90DP"Android:layout_height= "100DP"Android:scaletype= "Fitxy"//Set all picture sizes consistent android:padding= "1px"/>//Set four peripheral pitch to 1 pixels</LinearLayout>

ImageView

<LinearLayoutAndroid:layout_width= "Fill_parent"Android:layout_height= "Fill_parent">  <GridViewAndroid:id= "@+id/gv"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"Android:numcolumns= "3"//Set all picture sizes consistent Android:stretchmode= "ColumnWidth"/>//Set all picture sizes to match</LinearLayout>

GridView

1GridView GV = (GridView) Findviewbyid (R.ID.GV);//Locate the control2field[] fields = r.drawable.class. Getdeclaredfields ();//read the picture at the end of the PNG3list<map<string, integer>> data =NewArraylist<map<string, integer>>();4      for(Field field:fields) {5map<string, integer> map =NewHashmap<string, integer>();6             Try {         7Map.put ("img", Field.getint (r.drawable.class));8 data.add (map);9}Catch(IllegalArgumentException e) {Ten e.printstacktrace (); One}Catch(illegalaccessexception e) { A E.printstacktrace ();  -             } -     } theSimpleadapter adapter =NewSimpleadapter ( This, data, r.layout.gridview0, -             Newstring[] {"img"},New int[] {r.id.gimg});//Create an adapter -Gv.setadapter (adapter);//Add GridView Object -  +Gv.setonitemclicklistener (NewOnitemclicklistener () { -          Public voidOnitemclick (adapterview<?> ADP, view view,intPositionLongArg) { +Map<string, integer> map= (map<string, integer>) adp.getitematposition (position); A             intImgid=map.get ("img"); atImageView iv=NewImageView (GridView0. This); - Iv.setscaletype (ImageView.ScaleType.CENTER); - Iv.setimageresource (imgid); -             FinalDialog da=NewAlertdialog.builder (GridView0. This). Settitle ("Show Pictures"). Setview (iv). Create (); -                 NewThread () {//set the thread so that the dialog box closes after 5 seconds -                      Public voidrun () { in                         Try {          -Thread.Sleep (5000); to}Catch(interruptedexception e) { + E.printstacktrace ();  -}finally{              the Da.dismiss ();  *                         } $                     }Panax Notoginseng }.start (); - da.show (); the     } +});

GridView Section Java code

Advanced Controls "Android 5"--listactivity