Android practice simple tutorial-47th gun (multiple choice of ListView-ordering system), androidlistview

Android practice simple tutorial-47th gun (multiple choice of ListView-ordering system), androidlistview

The multiple choice of ListView is usually used in the take-out menu. You can improve the selection and add it to your project. Let's take a look at the code below:

I. Code

1. main. xml: (composed of a ListView and a Button)

<? 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: orientation = "vertical"> <ListView android: id = "@ + id/drink_list" android: layout_width = "fill_parent" android: layout_height = "0dp" android: layout_weight = "1"> </ListView> <Button android: id = "@ + id/btn_commit" android: layout_width = "match_parent" android: layout_height = "58dp" android: text = "OK"/> </LinearLayout>

2. item. 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 = "# ffffff" android: orientation = "horizontal"> <CheckBox android: id = "@ + id/check_box" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: clickable = "false" android: focusable = "false" android: focusableInTouchMode = "true"/> <ImageView android: id = "@ + id/food_imager" android: layout_width = "50dp" android: layout_height = "50dp" android: background = "# ffffff"/> <TextView android: id = "@ + id/food_name" android: layout_width = "100dp" android: layout_height = "50dp" android: text = "coffee" android: gravity = "center_vertical" android: layout_marginLeft = "10dp" android: textSize = "18sp"/> <TextView android: layout_width = "wrap_content" android: layout_height = "50dp" android: text = "unit price: RMB" android: paddingLeft = "20dp" android: textSize = "12sp"/> <TextView android: id = "@ + id/price" android: layout_width = "wrap_content" android: layout_height = "50dp" android: paddingRight = "10dp" android: text = "18" android: layout_marginLeft = "20dp" android: textSize = "18sp"/> </LinearLayout>

3. Food. java :( bean class)

package com.example.info;public class Food {public int food_img;public String food_name;public String food_price;public String text;public int getFood_img() {return food_img;}public void setFood_img(int food_img) {this.food_img = food_img;}public String getFood_name() {return food_name;}public void setFood_name(String food_name) {this.food_name = food_name;}public String getFood_price() {return food_price;}public void setFood_price(String food_price) {this.food_price = food_price;}public Food(int food_img, String food_name, String food_price) {super();this.food_img = food_img;this.food_name = food_name;this.food_price = food_price;}public Food() {super();}@Overridepublic String toString() {return super.toString();}}

4. MyListViewAdapter. java:

Package com. example. adapter; import java. util. arrayList; import java. util. hashMap; import com.example.info. food; import com. example. listviewselectitem. r; import android. content. context; import android. view. layoutInflater; import android. view. view; import android. view. viewGroup; import android. widget. baseAdapter; import android. widget. checkBox; import android. widget. imageView; import android. widget. textView; public class MyListViewAdapter extends BaseAdapter {// The listprivate ArrayList <Food> foodlist that fills in data; // It is used to control the CheckBox selection status private static HashMap <Integer, Boolean> isSelected; // Context private context Context; // used to import the layout private LayoutInflater inflater = null; // constructor public MyListViewAdapter (ArrayList <Food> list, context Context) {this. context = context; this. foodlist = list; inflater = LayoutInflater. from (context); isSelected = new HashMap <Integer, Boolean> (); // initialize data initDate () ;}// initialize isSelected data private void initDate () {for (int I = 0; I <foodlist. size (); I ++) {getIsSelected (). put (I, false) ;}@overridepublic int getCount () {return foodlist. size () ;}@ Overridepublic Object getItem (int position) {return foodlist. get (position) ;}@ Overridepublic long getItemId (int position) {return position ;}@ Overridepublic View getView (int position, View convertView, ViewGroup parent) {ViewHolder holder = null; if (convertView = null) {// obtain the ViewHolder object holder = new ViewHolder (); // import the layout and assign it to convertviewconvertView = inflater. inflate (R. layout. item, null); holder. imageView = (ImageView) convertview.findviewbyid(r.id.food_imager%%holder.txt 1 = (TextView) convertview.findviewbyid(r.id.food_name%%%holder.txt 2 = (TextView) convertView. findViewById (R. id. price); holder. cb = (CheckBox) convertView. findViewById (R. id. check_box); // set the label convertView for the view. setTag (holder);} else {// retrieve holderholder = (ViewHolder) convertView. getTag ();} // get the data Food food = foodlist. get (position); // returns 2. setText (food. food_price); // set the display of TextView in the list // set the checkbox selection status based on isSelected holder. cb. setChecked (getIsSelected (). get (position); return convertView;} public static HashMap <Integer, Boolean> getIsSelected () {return isSelected;} public static void setIsSelected (HashMap <Integer, Boolean> isSelected) {MyListViewAdapter. isSelected = isSelected;} public static class ViewHolder {public TextView txt1; public TextView txt2; public ImageView imageView; public CheckBox cb ;}}

5. MainActivity. java:

Package com. example. listviewselectitem; import java. util. arrayList; import java. util. hashMap; import com. example. adapter. myListViewAdapter; import com. example. adapter. myListViewAdapter. viewHolder; import com.example.info. food; import android. OS. bundle; import android. app. activity; import android. content. context; import android. view. layoutInflater; import android. view. view; import android. view. window; import Droid. view. view. onClickListener; import android. widget. adapterView; import android. widget. button; import android. widget. checkBox; import android. widget. listView; import android. widget. toast; import android. widget. adapterView. onItemClickListener; public class MainActivity extends Activity implements OnClickListener, OnItemClickListener {private ListView listView; private Button OK; private ArrayList <Food> fo Ods = new ArrayList <Food> (); private MyListViewAdapter adapter; private CheckBox checkBox; protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); requestWindowFeature (Window. FEATURE_NO_TITLE); setContentView (R. layout. activity_main); initView (); // initialize the control View = LayoutInflater. from (this ). inflate (R. layout. item, null); checkBox = (CheckBox) view. findViewById (R. id. check_box); ini TData (); // initialize virtual data adapter = new MyListViewAdapter (foods, getApplicationContext (); listView. setAdapter (adapter);}/*** initialization control **/public void initView () {listView = (ListView) findViewById (R. id. drink_list); // listview list control OK = (Button) findViewById (R. id. btn_commit); // click OK. setOnClickListener (this); listView. setOnItemClickListener (this);}/*** initialize virtual data **/public void initData () {Class cls = R. drawabl E. class; // reflection try {foods. add (new Food (cls. getDeclaredField ("d1 "). getInt (null), "Kiwi juice", "10"); foods. add (new Food (cls. getDeclaredField ("d2 "). getInt (null), "orange juice", "12"); foods. add (new Food (cls. getDeclaredField ("d3 "). getInt (null), "beer", "15"); foods. add (new Food (cls. getDeclaredField ("d4 "). getInt (null), "grape juice", "10"); foods. add (new Food (cls. getDeclaredField ("d5 "). getInt (null), "Milk Tea", "8"); foods. add (new Food (Cls. getDeclaredField ("d6 "). getInt (null), "mint juice", "10"); foods. add (new Food (cls. getDeclaredField ("d7 "). getInt (null), "Lemon Mint", "12"); foods. add (new Food (cls. getDeclaredField ("d8 "). getInt (null), "coconut juice", "10"); foods. add (new Food (cls. getDeclaredField ("d9 "). getInt (null), "pearl milk tea", "9"); foods. add (new Food (cls. getDeclaredField ("d10 "). getInt (null), "pomegranate juice", "10");} catch (Exception e) {e. printStackTrace () ;}}/*** Press Button click event processing **/@ Overridepublic void onClick (View v) {int mID = v. getId (); switch (mID) {case R. id. btn_commit: myPrice (); // calculates the total price and outputs the break;}/*** method of calculating the total price **/public void myPrice () {HashMap <Integer, boolean> map = MyListViewAdapter. getIsSelected (); String str = ""; int money = 0; for (int I = 0; I <map. size (); I ++) {if (map. get (I) {str + = (I + ""); money + = Integer. parseInt (foods. get (I ). food_price) ;}} MyL IstViewAdapter. getIsSelected (). get (""); Toast. makeText (getApplicationContext (), "selected" + str + ", total price:" + money, Toast. LENGTH_SHORT ). show ();}/*** method for selecting items in listview **/@ Overridepublic void onItemClick (AdapterView <?> Parent, View view, int position, long id) {// get the ViewHolder object, this eliminates the need to instantiate the cb instance step ViewHolder holder = (ViewHolder) view through the layer-by-layer findViewById. getTag (); // Changes the status of the CheckBox holder. cb. toggle (); // record the CheckBox selection status to MyListViewAdapter. getIsSelected (). put (position, holder. cb. isChecked ());}}

Ii. running instances

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