Eatwhatapp Development Combat (III)

In combat two we added "Add Store function" on Eatwhatapp. Next, let's show the added store, where we use the control--listview. First on the demo chart:

First, let's set up the layout first:

<relativelayout Android:id= "@+id/et_relative"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content" > <Button Android:id= "@+id/add_shop_btn"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_alignparentright= "true"Android:text= "@string/add_shop_btn_text"Android:onclick= "Addshop"/> <EditText Android:id= "@+id/addshop_et"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:layout_toleftof= "@id/add_shop_btn"android:textsize= "18sp"/> </RelativeLayout> <TextView Android:id= "@+id/shop_name"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "@string/shop_name"Android:layout_below= "@id/et_relative"Android:paddingtop= "20DP"android:textsize= "18sp"/> <Button Android:id= "@+id/random_btn"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:layout_below= "@id/shop_name"Android:text= "@string/random_btn_text"/> <ListView Android:id= "@+id/lv_shop"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:layout_below= "@id/random_btn"/>

Set the layout of each item item in the ListView, layout file: Item_shop.xml

<?xml version= "1.0" encoding= "Utf-8"? ><relativelayout xmlns:android= "http://schemas.android.com/apk/res/ Android "    android:layout_width=" Match_parent "    android:layout_height=" Match_parent "     android:orientation= "vertical" >        <TextView         android:id= "@+id/item_text"         android:layout_width= "Wrap_content"        android:layout_height= "Wrap_content"         Android:textsize= "30SP"        android:layout_centerinparent= "true"        Android:text = "Shop name"/></relativelayout>

Next in the Java code, first add a shop class, which contains the properties: String name;

 Public class Shop {        private  String name;          Public Shop (String name) {        this. Name = name;    }           Public String GetName () {        return  name;    }      Public void setName (String name) {        this. Name = name;    }    } 

Define an inner class shopinfoadapter inherit Baseadapter in mainactivity:

//internal class adapter inheritance Baseadapter    classShopinfoadapterextendsbaseadapter{@Override Public intGetCount () {returnshoplist.size (); } @SuppressLint ("Viewholder") @Override PublicView GetView (intposition, View Converview, ViewGroup parent) {View v= View.inflate (mainactivity. This, R.layout.item_shop,NULL); TextView Tv_name=(TextView) V.findviewbyid (R.id.item_text);                        Tv_name.settext (Shoplist.get (position). GetName ()); returnv; } @Override PublicObject GetItem (intarg0) {            return NULL; } @Override Public LongGetitemid (intarg0) {            return0; }        }

At the beginning define:

    // Shop Type    Private List<shop> shoplist;     // ListView Control    Private ListView shop_lv;     // Adapter    Private Shopinfoadapter Shopadapter;

Initialize Lsitview and adapter in Inti () and set adapter:

// Initialize the control ListViewshop_lv = (listview) Findviewbyid (R.id.lv_shop);         // Initializing the adapter New Shopinfoadapter ();         // set Adapter shop_lv.setadapter (shopadapter);

Modify Addshop ():

if(AddName! =NULL&& "". Equals (AddName)) {            //List Shop Add store nameShop shop =NewShop (AddName); //add a newly instantiated shop objectShoplist.add (Shop); //Refresh ListViewshopadapter.notifydatasetchanged (); //Empty text box contentsAddshop_et.settext (""); String Toast_text= "Add Shop:" +AddName; Toast.maketext (mainactivity. This, Toast_text, Toast.length_short). Show (); } Else{toast.maketext (mainactivity). This, "Add content is empty", Toast.length_short). Show (); }

Modify the logic of the display store name in the RANDOM_BTN click event:

Shop_name.settext (Shoplist.get (num). GetName ());

This completes the display of the store name.

Eatwhatapp Development Combat (III)