Develop Reference

How can i add favourite (CheckBox/ToggleButton/ImageView) to my ListView?

Please help me.
How can i add favourite (CheckBox/ToggleButton/ImageView) to my ListView? ... I have never added a favourite button before so I would like to add one in listView with CheckBox or ToggleButton or ImageView .
Hope everyone understand my question
My code :
This is my ListAdapter
static class ListAdapter extends BaseAdapter {
private LayoutInflater inflater;
private Context ctx;
public ListAdapter(Context context) {
inflater = LayoutInflater.from(context);
ctx = context;
}
public int getCount() {
return RecipeName.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if(convertView == null){
convertView = inflater.inflate(R.layout.row, null);
holder = new ViewHolder();
holder.txtRecipeName = (TextView) convertView.findViewById(R.id.txtRecipeName);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.txtRecipeName.setText(RecipeName[position]);
return convertView;
}
static class ViewHolder {
TextView txtRecipeName;
}
}
This is my row xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:weightSum="1"
android:gravity="center_horizontal"
android:background="#drawable/row">
<TextView
android:id="#+id/txtRecipeName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#color/text"
android:textSize="16sp"
android:textStyle="bold"
android:layout_weight="0.04"
android:typeface="normal"
android:background="#drawable/button2"/>
</LinearLayout>

For adding image u can use ImageView same as TextView in the .xml file..
Just add the src of the image after it "android:src="#drawable/beach" like this.
Here "#drawable/beach" is the path of image.
`<ImageView
android:id="#+id/photo_image_view" //for id
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop" //this will display image in center
android:src="#drawable/beach" /> //path of image`

For Toggle Button..use the following code in .xml file
<Switch
android:id="#+id/toggle_switch" //give id so can use this in java code later
android:layout_width="wrap_content" //set width
android:layout_height="wrap_content" //set height
android:text="Toggle Button" // string to be displayed
android:textAppearance="?android:textAppearanceSmall" />
How it will look
Toggle Button

Getting 250+ items but Custom Listview not displaying anything

I just created a list view with a custom view to create a country list for select
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/primary_light"
android:orientation="vertical"
tools:context=".RnActivity.RnView.RnUser.ActivitySignUpOptions">
<ListView
android:id="#+id/country_list_for_select_list_area"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/primary"
/>
</LinearLayout>
custom view
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<ImageView
android:id="#+id/view_layout_country_list_item_country_icon_image"
android:layout_width="50dp"
android:layout_height="match_parent"
android:src="#drawable/gjh_logo_b"
/>
<TextView
android:id="#+id/view_layout_country_list_item_country_name"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="start|center_vertical"
android:layout_weight="1"
android:text="India"
android:textSize="18sp" />
<TextView
android:id="#+id/view_layout_country_list_item_country_code"
android:layout_width="50dp"
android:layout_height="match_parent"
android:gravity="center|center_vertical"
android:layout_gravity="right"
android:text="IN"
android:textSize="18sp"
/>
</LinearLayout>
In Activity
ListView country_list_for_select_list_area;
#Override
public void lodeControls() {
country_list_for_select_list_area=findViewById(R.id.country_list_for_select_list_area);
}
#Override
public void setEvents() {
}
RxAdopterCountry countryAdopter;
#Override
public void createAdopters() {
countryAdopter=new RxAdopterCountry(getActivity(),R.layout.view_layout_country_list_item, RsXtraCountryList.getInstance().getCountryList());
}
#Override
public void setData() {
country_list_for_select_list_area.setAdapter(countryAdopter);
}
In Adopter
private final ArrayList<RentCountry> countryList;
private Context context;
public RxAdopterCountry(#NonNull Context context, int resource, ArrayList<RentCountry> countryList) {
super(context, resource);
this.context=context;
this.countryList=countryList;
}
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
if(convertView==null){
convertView= LayoutInflater.from(context).inflate(R.layout.view_layout_country_list_item, parent, false);
}
ImageView view_layout_country_list_item_country_icon_image=convertView.findViewById(R.id.view_layout_country_list_item_country_icon_image);
TextView view_layout_country_list_item_country_name=convertView.findViewById(R.id.view_layout_country_list_item_country_name);
TextView view_layout_country_list_item_country_code=convertView.findViewById(R.id.view_layout_country_list_item_country_code);
view_layout_country_list_item_country_name.setText(countryList.get(position).getName());
view_layout_country_list_item_country_code.setText(countryList.get(position).getCode());
view_layout_country_list_item_country_icon_image.setImageResource(countryList.get(position).getFlag_id());
return super.getView(position, convertView, parent);
}
i debugged the whole code and there are 250 items are coming in
private final ArrayList<RentCountry> countryList;
but list view is showing nothing
What I am doing wrong? I tried everything and debugged the whole code 10 times. yes I am getting the data in the ArrayList bu still noting is appearing in the list view.
Please help

The problem with your code is you are returning super.getView(position, convertView, parent) from getView while you should be returning the View you just created that is convertView .
For super constructor call you have to use super(context, resource, countryList) so that Adapter can return the size of list.
Change getView like below
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
//...
return convertView;
}
Also you should be using RecyclerView now. ListView and GridView are legacy widgets for a long time . RecyclerView is much more flexible.

ListView doesn't display on screen

I recently started to use ListView on Android Application and I'm not making it to display at the screen.
I saw many tutorials on how to do a custom Adapter and followed it line by line, but at the end I wasn't able to make the ListView display on my screen, I even let a fixed Text in one TextView to display at the ListView but it still didn't displayed it.
This is the constructor of my entity code:
public Classificacao(int colocacao, int time, int pontos) {
this.colocacao = colocacao;
this.time = time;
this.pontos = pontos;
}
This my Custom Adapter that extends "ArrayAdapter"
private Context context;
private ArrayList<Classificacao> classificacaoList;
ClassificacaoAdapter(Context context, ArrayList<Classificacao> classificacaoList) {
super(context, R.layout.layout_classificacao, classificacaoList);
this.context = context;
this.classificacaoList = classificacaoList;
}
#SuppressLint("SetTextI18n")
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if(convertView == null){
convertView = layoutInflater.inflate(R.layout.layout_classificacao, parent, false);
}
TextView colocacao = convertView.findViewById(R.id.texto1);
colocacao.setText(Integer.toString(classificacaoList.get(position).getColocacao()));
ImageView imagem = convertView.findViewById(R.id.imagem1);
imagem.setImageResource(classificacaoList.get(position).getImagem());
TextView nome = convertView.findViewById(R.id.texto2);
nome.setText(classificacaoList.get(position).getTime());
TextView pontos = convertView.findViewById(R.id.texto3);
pontos.setText(Integer.toString(classificacaoList.get(position).getPontos()));
return convertView;
}
This the layout "activity_atividade02" that have the ListView, and some others Text views that I won't display here.
<ListView
android:id="#+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
This is the layout "layout_classificacao" that will be filled by the adapter
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="20dp">
<TextView
android:id="#+id/texto1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:textColor="#android:color/black"
android:textSize="30sp" />
<ImageView
android:id="#+id/imagem1"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:layout_weight="1"
android:contentDescription="imagem do time"
app:srcCompat="#drawable/flamengo" />
<TextView
android:id="#+id/texto2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:textColor="#color/colorPrimary"
android:textSize="30sp" />
<TextView
android:id="#+id/texto3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:textColor="#android:color/black"
android:textSize="30sp" />
</LinearLayout>
And this is the main class "Atividade02"
that start everything
public class Atividade02 extends AppCompatActivity {
ListView listView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_atividade02);
listView = findViewById(R.id.listView);
ArrayList<Classificacao> classificacaoArrayList = new ArrayList<>();
classificacaoArrayList.add(new Classificacao(1, 2,46));
classificacaoArrayList.add(new Classificacao(2, 1,42));
classificacaoArrayList.add(new Classificacao(3,0,38));
classificacaoArrayList.add(new Classificacao(4,3,35));
classificacaoArrayList.add(new Classificacao(5,5,33));
classificacaoArrayList.add(new Classificacao(6,4,33));
ArrayAdapter classificacaoAdapter = new ClassificacaoAdapter(this, classificacaoArrayList);
listView.setAdapter(classificacaoAdapter);
}
}
Resuming, the ListView isn't displaying the "ClassificacaoAdapter" and I want it to do it.

Make sure adapter has the method getItemcount() and it returns the classificacaoList.size(). It should not return 0;

Well... it was a pretty obvious problem, in the main layout activity_atividade02 there was a LinearLayout above the ListView that it's layout_height was set to match_parent and it was occupying the entire layout and not letting the ListView being displayed.

I test your code as you write and found an error here and it works normally but I comment imageView line because you don't define it in Classificacao class
an error here
TextView nome = convertView.findViewById(R.id.texto2);
nome.setText(classificacaoList.get(position).getTime());
setText() accept String only ..but you pass integer rather than String you can do that
nome.setText(""+classificacaoList.get(position).getTimee());
or use
Integer.toString( classificacaoList.get(position).getTimee() )
as you use in other lines

please add getCount() method in your ClassificacaoAdapter class, it is an override method. It will return the size of the list,if you will not override this it will return 0 as your list size.
public int getCount() {
return classificacaoList .size();
}

NullPointException in ListView when getting button

I am having a weird problem and can't seem to find whats causing it. Every view component in my ArrayAdapter is being located in the getView method except my button which is causes a NullPointerException.
Adapter:
public class ItemAdapter extends ArrayAdapter<Item>{
private Context context;
private int resource;
private List<Item> list;
public ItemAdapter(Context context, int resource, List<Item> list)
{
super(context, resource, list);
this.context = context;
this.resource = resource;
this.list = list;
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
if (convertView == null)
convertView = LayoutInflater.from(context).inflate(resource, parent,false);
TextView name = (TextView) convertView.findViewById(R.id.itemName);
ImageView itemImg = (ImageView) convertView.findViewById(R.id.itemImg);
Button addToCart = (Button) convertView.findViewById(R.id.button1);
final Item item = list.get(position);
name.setText(item.getName());
UrlImageViewHelper.setUrlDrawable(itemImg, item.getPicture());
addToCart.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View view)
{
Toast.makeText(context, "Clicked", Toast.LENGTH_LONG).show();
}
});
return convertView;
}
}
Fragment with listview
#InjectView(R.id.itemList) private ListView listView;
#Inject private ItemDao dao;
private ArrayAdapter<Item> adapter;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
return inflater.inflate(R.layout.fragment_shop, container, false);
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState)
{
super.onViewCreated(view, savedInstanceState);
dao.open();
List<Item> items = dao.findAll();
dao.close();
adapter = new ItemAdapter(getActivity(),R.layout.list_product_item, items);
listView.setAdapter(adapter);
}
list_product_item
<?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="horizontal"
android:paddingBottom="5dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="5dp" >
<ImageView
android:id="#+id/itemImg"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginRight="5dp"
android:scaleType="centerCrop" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/itemName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/itemStoreName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
Now the call to convertView.findViewById(R.id.button1) returns a null instance. What is the cause of this and how can I fix it.

do you have right the name of the layout?
adapter = new GroceryItemAdapter(getActivity(), R.layout.list_textview, items);
vs.
list_product_item
(I am assuming this is the file name for R.layout.list_product_item)

Instead of getting the layout inflater using the from method try initializing the inflater in the constructor..
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
in the getView
convertView = mInflater.inflate(your layout, null);

Extending ListActivity android.R.id.list

I am creating a Calculator. When calculations are made, I need them displayed, then clickable so I can delete individual figures. I followed this tutorial, and got this far. The only problem is when I run it, I get a FC and my logcat says this:
Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
All of my research say to change my id to android.R.id.list. I tried this, but still getting the same error.
Here is my code:
CustomAdapter.java (extends ArrayAdapter)
private final Context context;
private final ArrayList<Calculations> items = null;
private final LayoutInflater inflater;
public CustomListAdapter(Context context, int textViewResourceId, ArrayList<Calculations>items){
super(context, textViewResourceId, items);
this.context = context;
this.items = items;
this.inflater = LayoutInflater.from(context);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final View v = convertView != null
? convertView
: infalter.inflate(R.layout.list_item, parent, false);
final Calculations c = items.get(position);
final TextView type = (TextView) v.findViewById(R.id.tvType);
final TextView figure = (TextView) v.findViewById(R.id.tvFullFigure);
final TextView amount = (TextView) v.findViewById(R.id.tvAmount);
type.setText(c.getType());
figure.setText(c.getFigure());
amount.setText(c.getFigureAmount());
return v;
}
acitivty_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="15dp"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:background="#drawable/concret_back"
>
<!--Code remove for brevity-->
<ListView
android:id="#+id/android.R.id.list"
android:layout_width="wrap_content"
android:layout_height="fill_parent" />
</RelativeLayout>
I have had this problem with another app I have done and never found a solution. So I though I would ask why do I keep getting the Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' error?
Thanks for any input.

Change your ListView id from
<ListView
android:id="#+id/android.R.id.list"
android:layout_width="wrap_content"
android:layout_height="fill_parent" />
to
<ListView
android:id="#android:id/list"
android:layout_width="wrap_content"
android:layout_height="fill_parent" />