Android Course---optimization listview list view (2)

Layout_simple.xml

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content">    <ImageViewAndroid:layout_width= "70DP"Android:layout_height= "70DP"android:src= "@drawable/yuantu"Android:id= "@+id/lv2"/>    <LinearLayoutAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content"android:orientation= "vertical"android:layout_gravity= "Center_vertical"Android:layout_marginleft= "20DP">        <TextViewAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Food Pictures"Android:id= "@+id/tv1"/>        <TextViewAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "very tasty."Android:id= "@+id/tv2"/>    </LinearLayout></LinearLayout>

Activity_ui5.xml

<? XML version= "1.0" encoding= "Utf-8" ?> <  xmlns:android= "http://schemas.android.com/apk/res/android"    Android:layout_ Width= "Match_parent"    android:layout_height= "Match_parent"     Android:id= "@+id/lv_2"></ListView>

Uiactity.java

 PackageCom.hanqi.test5;ImportAndroid.os.Bundle;Importandroid.support.v7.app.AppCompatActivity;ImportAndroid.util.Log;ImportAndroid.view.LayoutInflater;ImportAndroid.view.View;ImportAndroid.view.ViewGroup;ImportAndroid.widget.BaseAdapter;ImportAndroid.widget.ImageView;ImportAndroid.widget.ListView;ImportAndroid.widget.TextView;Importjava.util.ArrayList;Importjava.util.List; Public classUIActivity5extendsappcompatactivity{//Data Source//list<map<string,object>> LM;List<food>LF; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.LAYOUT.ACTIVITY_UI5); //Get ListViewListView lv_2 =(ListView) Findviewbyid (r.id.lv_2); //preparing the data sourceLF =NewArraylist<food>(); Lf.add (NewFood (R.drawable.yuantu, "Content 1", "Gourmet 1")); Lf.add (NewFood (R.drawable.yuantu, "Content 2", "Gourmet 2")); Lf.add (NewFood (R.drawable.yuantu, "Content 3", "Gourmet 3")); Lf.add (NewFood (R.drawable.yuantu, "Content 4", "Gourmet 4")); /*lm =new arraylist<map<string,object>> ();        map<string,object> map = new hashtable<string, object> ();        Map.put ("image", R.drawable.yuantu);        Map.put ("name", "Gourmet picture 01");        Map.put ("Content", "very tasty ah 01");        Lm.add (map);        Map = new hashtable<string, object> ();        Map.put ("image", R.drawable.yuantu);        Map.put ("name", "Gourmet Picture 02");        Map.put ("Content", "very tasty ah 02");        Lm.add (map);        Map = new hashtable<string, object> ();        Map.put ("image", R.drawable.yuantu);        Map.put ("name", "Gourmet picture 03");        Map.put ("Content", "very tasty ah 03");        Lm.add (map);        Map = new hashtable<string, object> ();        Map.put ("image", R.drawable.yuantu);        Map.put ("name", "Gourmet picture 04");        Map.put ("Content", "very tasty ah 04"); Lm.add (map);*/Lv_2.setadapter (NewMybaseadapter ()); }    classMybaseadapterextendsBaseadapter {//get the number of rows to display@Override Public intGetCount () {returnlf.size (); }        //gets the row that corresponds to the subscript@Override PublicObject GetItem (intposition) {            returnLf.get (position); }        //gets the ID of the corresponding row@Override Public LongGetitemid (intposition) {            returnposition; }        //fitting data to a view, returning a view//3 parameters: 1.position (subscript of data)//2.convertView (Reusable view)//3.parent (parent view)@Override PublicView GetView (intposition, View Convertview, ViewGroup parent) {            //if Convertview is empty, the layout file is loaded            if(Convertview = =NULL) {LOG.E ("TAG", "position =" +position); //1. Get the style file (layout file)Layoutinflater Layoutinflater =Getlayoutinflater (); Convertview= Layoutinflater.inflate (R.layout.layout_simple,NULL); }            //2. Binding The view component of the data and layout files//1) Get a row of data from the data source//map<string,object> Map = lm.get (position); Food and food=Lf.get (position); //2) Get the view component of the layout fileImageView iv_2 =(ImageView) Convertview.findviewbyid (R.ID.LV2); TextView TV1=(TextView) Convertview.findviewbyid (R.ID.TV1); TextView TV2=(TextView) Convertview.findviewbyid (R.ID.TV2); //3) binding (data adapter)//Iv_2.setimageresource ((int) map.get ("image"));//Tv1.settext (Map.get ("name"). toString ());//Tv2.settext (Map.get ("content"). toString ());Iv_2.setimageresource ((int) Food.getimage ());            Tv1.settext (Food.getname ());            Tv2.settext (Food.getcontent ()); //3. Return to view            returnConvertview; }    }}

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Android Course---optimization listview list view (2)