Custom Adapter for List View

Question

I want to create a custom adapter for my list view  Is there any article that can walk me through how to create one and also explain how it works

User · Answer

check this link  in very simple via the convertView  we can get the layout of a row which will be displayed in listview  which is the parentView    View v   convertView   if  v    null         LayoutInflater vi      vi   LayoutInflater from getContext         v   vi inflate R layout itemlistrow  null        using the position  you can get the objects of the List lt Item gt    Item p   items get position     after that we ll have to set the desired details of the object to the identified form widgets   if  p    null         TextView tt    TextView  v findViewById R id id       TextView tt1    TextView  v findViewById R id categoryId       TextView tt3    TextView  v findViewById R id description        if  tt    null            tt setText p getId               if  tt1    null             tt1 setText p getCategory   getId               if  tt3    null             tt3 setText p getDescription               then it will return the constructed view which will be attached to the parentView  which is a ListView GridView

User · Answer

It is very simple   import android content Context  import android content DialogInterface  import android support annotation NonNull  import android support annotation Nullable  import android support v7 app AlertDialog  import android view LayoutInflater  import android view View  import android view ViewGroup  import android widget ArrayAdapter  import android widget Button  import android widget ImageView  import android widget TextView   import java util List          Created by Belal on 9 14 2017         we need to extend the ArrayAdapter class as we are building an adapter public class MyListAdapter extends ArrayAdapter lt Hero gt           the list values in the List of type hero      List lt Hero gt  heroList         activity context      Context context         the layout resource file for the list items     int resource         constructor initializing the values      public MyListAdapter Context context  int resource  List lt Hero gt  heroList            super context  resource  heroList           this context   context          this resource   resource          this heroList   heroList               this will return the ListView Item as a View      NonNull      Override     public View getView final int position   Nullable View convertView   NonNull ViewGroup parent               we need to get the view of the xml for our list item           And for this we need a layoutinflater         LayoutInflater layoutInflater   LayoutInflater from context              getting the view         View view   layoutInflater inflate resource  null  false              getting the view elements of the list from the view         ImageView imageView   view findViewById R id imageView           TextView textViewName   view findViewById R id textViewName           TextView textViewTeam   view findViewById R id textViewTeam           Button buttonDelete   view findViewById R id buttonDelete              getting the hero of the specified position         Hero hero   heroList get position              adding values to the list item          imageView setImageDrawable context getResources   getDrawable hero getImage              textViewName setText hero getName             textViewTeam setText hero getTeam                adding a click listener to the button to remove item from the list         buttonDelete setOnClickListener new View OnClickListener                  Override             public void onClick View view                      we will call this method to remove the selected value from the list                   we are passing the position which is to be removed in the method                  removeHero position                                        finally returning the view         return view               this method will remove the item from the list      private void removeHero final int position              Creating an alert dialog to confirm the deletion         AlertDialog Builder builder   new AlertDialog Builder context           builder setTitle  Are you sure you want to delete this                if the response is positive in the alert          builder setPositiveButton  Yes   new DialogInterface OnClickListener                  Override             public void onClick DialogInterface dialogInterface  int i                       removing the item                  heroList remove position                      reloading the list                  notifyDataSetChanged                                         if response is negative nothing is being done          builder setNegativeButton  No   new DialogInterface OnClickListener                  Override             public void onClick DialogInterface dialogInterface  int i                                          creating and displaying the alert dialog          AlertDialog alertDialog   builder create            alertDialog show              Source  Custom ListView Android Tutorial

User · Answer

You can take a look at this sample in the official ApiDemos  It shows how to extend BaseAdapter and apply it to a ListView  After that  just look at the reference for BaseAdapter and try to understand what each method does  including the inherited ones  and when how to use it   Also  Google is your friend

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Data Model  public class DataModel       String name      String type      String version number      String feature       public DataModel String name  String type  String version number  String feature             this name name          this type type          this version number version number          this feature feature              public String getName             return name             public String getType             return type             public String getVersion number             return version number             public String getFeature             return feature                Array Adapter  public class CustomAdapter extends ArrayAdapter lt DataModel gt  implements View OnClickListener      private ArrayList lt DataModel gt  dataSet      Context mContext          View lookup cache     private static class ViewHolder           TextView txtName          TextView txtType          TextView txtVersion          ImageView info             public CustomAdapter ArrayList lt DataModel gt  data  Context context            super context  R layout row item  data           this dataSet   data          this mContext context               Override     public void onClick View v             int position  Integer  v getTag            Object object  getItem position           DataModel dataModel  DataModel object           switch  v getId                          case R id item info                  Snackbar make v   Release date    dataModel getFeature    Snackbar LENGTH LONG                           setAction  No action   null  show                    break                       private int lastPosition   -1        Override     public View getView int position  View convertView  ViewGroup parent               Get the data item for this position         DataModel dataModel   getItem position              Check if an existing view is being reused  otherwise inflate the view         ViewHolder viewHolder     view lookup cache stored in tag          final View result           if  convertView    null                 viewHolder   new ViewHolder                LayoutInflater inflater   LayoutInflater from getContext                 convertView   inflater inflate R layout row item  parent  false               viewHolder txtName    TextView  convertView findViewById R id name               viewHolder txtType    TextView  convertView findViewById R id type               viewHolder txtVersion    TextView  convertView findViewById R id version number               viewHolder info    ImageView  convertView findViewById R id item info                result convertView               convertView setTag viewHolder             else               viewHolder    ViewHolder  convertView getTag                result convertView                     Animation animation   AnimationUtils loadAnimation mContext   position  gt  lastPosition    R anim up from bottom   R anim down from top           result startAnimation animation           lastPosition   position           viewHolder txtName setText dataModel getName             viewHolder txtType setText dataModel getType             viewHolder txtVersion setText dataModel getVersion number             viewHolder info setOnClickListener this           viewHolder info setTag position              Return the completed view to render on screen         return convertView            Main Activity  public class MainActivity extends AppCompatActivity        ArrayList lt DataModel gt  dataModels      ListView listView      private static CustomAdapter adapter        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           Toolbar toolbar    Toolbar  findViewById R id toolbar           setSupportActionBar toolbar            listView  ListView findViewById R id list            dataModels  new ArrayList lt  gt              dataModels add new DataModel  Apple Pie    Android 1 0    1   September 23  2008             dataModels add new DataModel  Banana Bread    Android 1 1    2   February 9  2009             dataModels add new DataModel  Cupcake    Android 1 5    3   April 27  2009             dataModels add new DataModel  Donut   Android 1 6   4   September 15  2009             dataModels add new DataModel  Eclair    Android 2 0    5   October 26  2009             dataModels add new DataModel  Froyo    Android 2 2    8   May 20  2010             dataModels add new DataModel  Gingerbread    Android 2 3    9   December 6  2010             dataModels add new DataModel  Honeycomb   Android 3 0   11   February 22  2011             dataModels add new DataModel  Ice Cream Sandwich    Android 4 0    14   October 18  2011             dataModels add new DataModel  Jelly Bean    Android 4 2    16   July 9  2012             dataModels add new DataModel  Kitkat    Android 4 4    19   October 31  2013             dataModels add new DataModel  Lollipop   Android 5 0   21   November 12  2014             dataModels add new DataModel  Marshmallow    Android 6 0    23   October 5  2015              adapter  new CustomAdapter dataModels getApplicationContext              listView setAdapter adapter           listView setOnItemClickListener new AdapterView OnItemClickListener                  Override             public void onItemClick AdapterView lt   gt  parent  View view  int position  long id                     DataModel dataModel  dataModels get position                    Snackbar make view  dataModel getName     n  dataModel getType     API    dataModel getVersion number    Snackbar LENGTH LONG                           setAction  No action   null  show                                          Override     public boolean onCreateOptionsMenu Menu menu               Inflate the menu  this adds items to the action bar if it is present          getMenuInflater   inflate R menu menu main  menu           return true              Override     public boolean onOptionsItemSelected MenuItem item               Handle action bar item clicks here  The action bar will            automatically handle clicks on the Home Up button  so long            as you specify a parent activity in AndroidManifest xml          int id   item getItemId               noinspection SimplifiableIfStatement         if  id    R id action settings                return true                     return super onOptionsItemSelected item             row item xml   lt RelativeLayout xmlns android  http   schemas android com apk res android      android layout width  match parent      android layout height  wrap content      android orientation  vertical      android padding  10dp  gt        lt TextView         android id    id name          android layout width  wrap content          android layout height  wrap content          android layout alignParentTop  true          android text  Marshmallow          android textAppearance   android attr textAppearanceSmall          android textColor   android color black    gt         lt TextView         android id    id type          android layout width  wrap content          android layout height  wrap content          android layout below    id name          android layout marginTop  5dp          android text  Android 6 0          android textColor   android color black    gt        lt ImageView         android id    id item info          android layout width  wrap content          android layout height  wrap content          android layout alignParentEnd  true          android layout alignParentRight  true          android layout centerVertical  true          android src   android drawable ic dialog info    gt         lt LinearLayout         android layout width  wrap content          android layout height  wrap content          android layout centerInParent  true  gt            lt TextView             android id    id version heading              android layout width  wrap content              android layout height  wrap content              android text  API                android textColor   android color black              android textStyle  bold    gt            lt TextView             android id    id version number              android layout width  wrap content              android layout height  wrap content              android text  23              android textAppearance   android attr textAppearanceButton              android textColor   android color black              android textStyle  bold    gt        lt  LinearLayout gt    lt  RelativeLayout gt

User · Answer

public class CustomAdapter extends BaseAdapter       ArrayList lt BookPojo gt  data      Context ctx      int index 0       public CustomAdapter ArrayList lt BookPojo gt  data  Context ctx            super            this data   data          this ctx   ctx              Override     public int getCount                TODO Auto-generated method stub         return data size                Override     public Object getItem int position               TODO Auto-generated method stub         return data get position               Override     public long getItemId int position               TODO Auto-generated method stub         return position              Override     public View getView int position  View convertview  ViewGroup parent               TODO Auto-generated method stub         View v convertview           if v  null               LayoutInflater vi LayoutInflater from ctx               v vi inflate R layout messgeview null                       RelativeLayout rlmessage  RelativeLayout v findViewById R id rlmessgeview            TextView tvisdn  TextView v findViewById R id tvisdn           TextView tvtitle  TextView v findViewById R id tvtitle           TextView tvauthor  TextView v findViewById R id tvauthor           TextView tvprice  TextView v findViewById R id tvprice            BookPojo bpj data get position            tvisdn setText bpj isdn              tvtitle setText bpj title           tvauthor setText bpj author           tvprice setText bpj price               if index 2  0                        rlmessage setBackgroundColor Color BLUE                     else                       rlmessage setBackgroundColor Color YELLOW                       index             return v

User · Answer

Google has an example called EfficientAdapter  which in my opinion is the best simple example of how to implement custom adapters  http   developer android com resources samples ApiDemos src com example android apis view List14 html  CommonsWare has written a good explanation of the patterns used in the above example http   commonsware com Android excerpt pdf

User · Answer

This code is easy to understand   three horizontal text views layout xml   lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      android orientation  horizontal  android layout width  match parent      android layout height  match parent  gt        lt TextView         android layout width  wrap content          android layout height  wrap content          android id    id leftTextView   gt        lt TextView         android layout width  wrap content          android layout height  wrap content          android id    id centreTextView   gt        lt TextView         android layout width  wrap content          android layout height  wrap content          android id    id rightTextView   gt    lt  LinearLayout gt    ThreeStrings java  public class ThreeStrings       private String left      private String right      private String centre       public ThreeStrings String left  String right  String centre            this left   left          this right   right          this centre   centre            ThreeHorizontalTextViewsAdapter java  public class ThreeHorizontalTextViewsAdapter extends ArrayAdapter lt ThreeStrings gt     private int layoutResource   public ThreeHorizontalTextViewsAdapter Context context  int layoutResource  List lt ThreeStrings gt  threeStringsList        super context  layoutResource  threeStringsList       this layoutResource   layoutResource      Override public View getView int position  View convertView  ViewGroup parent         View view   convertView       if  view    null            LayoutInflater layoutInflater   LayoutInflater from getContext             view   layoutInflater inflate layoutResource  null              ThreeStrings threeStrings   getItem position        if  threeStrings    null            TextView leftTextView    TextView  view findViewById R id leftTextView           TextView rightTextView    TextView  view findViewById R id rightTextView           TextView centreTextView    TextView  view findViewById R id centreTextView            if  leftTextView    null                leftTextView setText threeStrings getLeft                       if  rightTextView    null                rightTextView setText threeStrings getRight                       if  centreTextView    null                centreTextView setText threeStrings getCentre                          return view              main layout xml   lt LinearLayout xmlns android  http   schemas android com apk res android      xmlns tools  http   schemas android com tools  android layout width  match parent      android layout height  match parent  android paddingLeft   dimen activity horizontal margin      android paddingRight   dimen activity horizontal margin      android paddingTop   dimen activity vertical margin      android paddingBottom   dimen activity vertical margin      android orientation  vertical      tools context  com androidapplication ListActivity  gt         lt ListView         android layout width  match parent          android layout height  wrap content          android id    id listView  gt  lt  ListView gt    lt  LinearLayout gt    MainActivity java  public class MainActivity extends Activity          Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            List lt ThreeStrings gt  threeStringsList   new ArrayList lt  gt             ThreeStrings threeStrings   new ThreeStrings  a    b    c            threeStringsList add threeStrings                   ListView listView    ListView findViewById R id listView           ThreeHorizontalTextViewsAdapter threeHorizontalTextViewsAdapter   new ThreeHorizontalTextViewsAdapter this  R layout three horizontal text views layout  threeStringsList           listView setAdapter threeHorizontalTextViewsAdapter

User · Answer

A more compact example of a custom adapter  using list array as my data        class MyAdapter extends ArrayAdapter lt Object gt        public ArrayAdapter Context context  List lt MyObject gt  objectList            super context  R layout my list item  R id textViewTitle  objectList toArray                 Override     public View getView int position  View convertView  ViewGroup parent            View row   super getView position  convertView  parent           TextView title    TextView  row findViewById R id textViewTitle           ImageView icon    ImageView  row findViewById R id imageViewAccessory           MyObject obj    MyObject  getItem position           icon setImageBitmap                 title setText obj name           return row            And this is how to use it   List lt MyObject gt  objectList       MyAdapter adapter   new MyAdapter this getActivity    objectList   listView setAdapter adapter

User · Answer

I know this has already been answered    but I wanted to give a more complete example   In my example  the ListActivity that will display our custom ListView is called OptionsActivity  because in my project this Activity is going to display the different options my user can set to control my app   There are two list item types  one list item type just has a TextView and the second list item type just has a Button   You can put any widgets you like inside each list item type  but I kept this example simple   The getItemView   method checks to see which list items should be type 1 or type 2   According to my static ints I defined up top  the first 5 list items will be list item type 1  and the last 5 list items will be list item type 2   So if you compile and run this  you will have a ListView that has five items that just contain a Button  and then five items that just contain a TextView   Below is the Activity code  the activity xml file  and an xml file for each list item type   OptionsActivity java   public class OptionsActivity extends ListActivity        private static final int LIST ITEM TYPE 1   0      private static final int LIST ITEM TYPE 2   1      private static final int LIST ITEM TYPE COUNT   2       private static final int LIST ITEM COUNT   10         The first five list items will be list item type 1         and the last five will be list item type 2     private static final int LIST ITEM TYPE 1 COUNT   5       private MyCustomAdapter mAdapter        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           mAdapter   new MyCustomAdapter            for  int i   0  i  lt  LIST ITEM COUNT  i                if  i  lt  LIST ITEM TYPE 1 COUNT              mAdapter addItem  item type 1              else             mAdapter addItem  item type 2                      setListAdapter mAdapter              private class MyCustomAdapter extends BaseAdapter            private ArrayList lt String gt  mData   new ArrayList lt String gt             private LayoutInflater mInflater           public MyCustomAdapter                 mInflater    LayoutInflater getSystemService Context LAYOUT INFLATER SERVICE                      public void addItem final String item                mData add item               notifyDataSetChanged                        Override         public int getItemViewType int position              if position  lt  LIST ITEM TYPE 1 COUNT                return LIST ITEM TYPE 1            else               return LIST ITEM TYPE 2                      Override         public int getViewTypeCount                 return LIST ITEM TYPE COUNT                      Override         public int getCount                 return mData size                        Override         public String getItem int position                return mData get position                       Override         public long getItemId int position                return position                      Override         public View getView int position  View convertView  ViewGroup parent                ViewHolder holder   null              int type   getItemViewType position               if  convertView    null                    holder   new ViewHolder                    switch type                        case LIST ITEM TYPE 1                          convertView   mInflater inflate R layout list item type1  null                           holder textView    TextView convertView findViewById R id list item type1 text view                           break                      case LIST ITEM TYPE 2                          convertView   mInflater inflate R layout list item type2  null                           holder textView    TextView convertView findViewById R id list item type2 button                           break                                    convertView setTag holder                 else                   holder    ViewHolder convertView getTag                              holder textView setText mData get position                return convertView                        public static class ViewHolder           public TextView textView             activity options xml    lt LinearLayout xmlns android  http   schemas android com apk res android      xmlns tools  http   schemas android com tools      android id    id container      android layout width  match parent      android layout height  match parent      android orientation  vertical        gt        lt ListView         android id    id optionsList          android layout width  match parent          android layout height  wrap content   gt       lt  ListView gt    lt  LinearLayout gt    list item type 1 xml    lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout     xmlns android  http   schemas android com apk res android      android id    id list item type1 layout      android layout width  match parent      android layout height  match parent      android orientation  vertical   gt        lt TextView         android id    id list item type1 text view          android layout width  wrap content          android layout height  wrap content          android text  Text goes here    gt    lt  LinearLayout gt    list item type2 xml    lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout     xmlns android  http   schemas android com apk res android      android id    id list item type2 layout      android layout width  match parent      android layout height  match parent      android orientation  vertical   gt        lt Button         android id    id list item type2 button          android layout width  wrap content          android layout height  wrap content          android text  Button text goes here    gt    lt  LinearLayout gt

User · Answer

BaseAdapter is best custom adapter for listview   Class MyAdapter extends BaseAdapter     and it has many functions such as getCount    getView   etc

User · Answer

import android app Activity   import android content Context   import android text Html   import android view LayoutInflater   import android view View   import android view ViewGroup   import android widget BaseAdapter   import android widget ImageView   import android widget TextView   import org json JSONObject   import java util ArrayList   public class OurteamAdapter extends BaseAdapter        Context cont      ArrayList lt OurteamModel gt  llist      OurteamAdapter madap      LayoutInflater inflater      JsonHelper Jobj      String Id      JSONObject obj   null      int position   0      public OurteamAdapter Context c ArrayList lt OurteamModel gt  Mi                this cont   c          this llist   Mi             Override     public int getCount                    TODO Auto-generated method stub         return llist size               Override     public Object getItem int position               TODO Auto-generated method stub         return llist get position              Override     public long getItemId int position               TODO Auto-generated method stub         return position             Override     public View getView final int position  View convertView  ViewGroup parent                   TODO Auto-generated method stub         if convertView    null                        LayoutInflater in    LayoutInflater  cont getSystemService Activity LAYOUT INFLATER SERVICE               convertView   in inflate R layout doctorlist  null                     TextView category    TextView  convertView findViewById R id button1           TextView title    TextView  convertView findViewById R id button2           ImageView i1  ImageView  convertView findViewById R id imageView1           category setText Html fromHtml llist get position  getGalleryName              title setText Html fromHtml llist get position  getGalleryDetail              if llist get position  getImagesrc    null                        i1 setImageBitmap llist get position  getImagesrc                       else                       i1 setImageResource R drawable anandlogo                     return convertView

User · Answer

Here is the complete walk through to create a custom adapter for list view step by step -  https   www caveofprogramming com guest-posts custom-listview-with-imageview-and-textview-in-android html  public class CustomAdapter extends BaseAdapter         String    result      Context context   int    imageId        private static LayoutInflater inflater null      public CustomAdapter MainActivity mainActivity  String   prgmNameList  int   prgmImages               TODO Auto-generated constructor stub         result prgmNameList          context mainActivity          imageId prgmImages           inflater     LayoutInflater  context                   getSystemService Context LAYOUT INFLATER SERVICE              Override     public int getCount                TODO Auto-generated method stub         return result length              Override     public Object getItem int position               TODO Auto-generated method stub         return position              Override     public long getItemId int position               TODO Auto-generated method stub         return position             public class Holder               TextView tv          ImageView img             Override     public View getView final int position  View convertView  ViewGroup parent               TODO Auto-generated method stub         Holder holder new Holder            View rowView                      rowView   inflater inflate R layout program list  null                holder tv  TextView  rowView findViewById R id textView1                holder img  ImageView  rowView findViewById R id imageView1                   holder tv setText result position             holder img setImageResource imageId position                      rowView setOnClickListener new OnClickListener                              Override             public void onClick View v                       TODO Auto-generated method stub                 Toast makeText context   You Clicked   result position   Toast LENGTH LONG  show                                         return rowView

User · Answer

public class ListAdapter extends ArrayAdapter lt Item gt         private int resourceLayout      private Context mContext       public ListAdapter Context context  int resource  List lt Item gt  items            super context  resource  items           this resourceLayout   resource          this mContext   context              Override     public View getView int position  View convertView  ViewGroup parent             View v   convertView           if  v    null                LayoutInflater vi              vi   LayoutInflater from mContext               v   vi inflate resourceLayout  null                      Item p   getItem position            if  p    null                TextView tt1    TextView  v findViewById R id id               TextView tt2    TextView  v findViewById R id categoryId               TextView tt3    TextView  v findViewById R id description                if  tt1    null                    tt1 setText p getId                                if  tt2    null                    tt2 setText p getCategory   getId                                if  tt3    null                    tt3 setText p getDescription                                      return v             This is a class I had used for my project  You need to have a collection of your items which you want to display  in my case it s  lt Item gt   You need to override View getView int position  View convertView  ViewGroup parent  method   R layout itemlistrow defines the row of the ListView    lt  xml version  1 0  encoding  utf-8   gt   lt TableLayout xmlns android  http   schemas android com apk res android      android layout height  wrap content  android orientation  vertical      android layout width  fill parent  gt        lt TableRow android layout width  fill parent                android id    id TableRow01                android layout height  wrap content  gt            lt TextView android textColor   FFFFFF                    android id    id id                    android layout width  fill parent                    android layout height  wrap content                    android text  id  android textStyle  bold                     android gravity  left                    android layout weight  1                     android typeface  monospace                    android height  40sp    gt       lt  TableRow gt        lt TableRow android layout height  wrap content                android layout width  fill parent  gt            lt TextView android textColor   FFFFFF                     android id    id categoryId                    android layout width  fill parent                    android layout height  wrap content                    android text  categoryId                     android layout weight  1                     android height  20sp    gt            lt TextView android layout height  wrap content                    android layout width  fill parent                     android layout weight  1                    android textColor   FFFFFF                    android gravity  right                    android id    id description                    android text  description                     android height  20sp    gt       lt  TableRow gt    lt  TableLayout gt    In the MainActivity define ListViewlike this       ListView yourListView    ListView  findViewById R id itemListView       get data from the table by the ListAdapter ListAdapter customAdapter   new ListAdapter this  R layout itemlistrow  List lt yourItem gt     yourListView  setAdapter customAdapter

[android] Custom Adapter for List View

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