1
I’m looking to make a product listing, where each line contains more than one information per line.
The problem is that the app throws exception (I believe) and closes when I click the button that would fill the list.
I made a custom View for each Listview item that is produtos_item.xml
My IDE is the Android Studio. A Activity is the Inicial.java and View where Listview is principal.xml.
main.xml (Activity)
<?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">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Formar lista"
android:onClick="FormarLista" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/Principal__ListaProdutos"
android:layout_centerHorizontal="true" />
</RelativeLayout>
products_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/produtos_item__Nome"
android:textColor="@android:color/background_dark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Nome do produto"
android:textStyle="bold"
android:textSize="17dp" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:baselineAligned="false">
<LinearLayout
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:textColor="@android:color/background_dark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/clientes_itens_Quantidade"
android:textSize="15dp" />
<TextView
android:textColor="@android:color/background_dark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" " />
<TextView
android:id="@+id/produtos_item__Quantidade"
android:textColor="@android:color/background_dark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="150"
android:textSize="15dp" />
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:textColor="@android:color/background_dark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/clientes_itens_Preco"
android:textSize="15dp" />
<TextView
android:textColor="@android:color/background_dark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" R$ "
android:textSize="15dp" />
<TextView
android:id="@+id/produtos_item__Valor"
android:textColor="@android:color/background_dark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="5.50"
android:textSize="15dp" />
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:textColor="@android:color/background_dark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/clientes_itens_Estoque"
android:textSize="15dp" />
<TextView
android:textColor="@android:color/background_dark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" R$ "
android:textSize="15dp" />
<TextView
android:id="@+id/produtos_item__Total"
android:textColor="@android:color/background_dark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="825.00"
android:textSize="15dp" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
Listadapterlist.java
public class ListAdapterList extends ArrayAdapter<Item> {
private Context context;
private ArrayList<Item> itens;
private int layoutResourceId;
public ListAdapterList(Context context, int layoutResourceId, ArrayList<Item> itens){
super(context, layoutResourceId, itens);
this.context = context;
this.itens = itens;
this.layoutResourceId = layoutResourceId;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Item item = this.itens.get(position);
convertView = LayoutInflater.from(this.context).inflate(layoutResourceId, parent, false);
((TextView) convertView.findViewById(R.id.produtos_item__Nome)).setText(item.getNome());
((TextView) convertView.findViewById(R.id.produtos_item__Quantidade)).setText(item.getQuantidade());
((TextView) convertView.findViewById(R.id.produtos_item__Valor)).setText(String.valueOf(item.getValor()));
((TextView) convertView.findViewById(R.id.produtos_item__Total)).setText(String.valueOf(item.getValorEstoque()));
return convertView;
}
}
Java item.
public class Item {
private String Nome;
private double Valor;
private int Quantidade;
public Item(String nome, double valor, int quantidade) {
Nome = nome;
Valor = valor;
Quantidade = quantidade;
}
public String getNome() { return Nome; }
public double getValor() { return Valor; }
public int getQuantidade() { return Quantidade; }
public double getValorEstoque() { return Quantidade * Valor; }
}
Initial.
public class Inicial extends Activity{
private ListView Lista;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.principal);
Lista = (ListView)findViewById(R.id.Principal__ListaProdutos);
}
public void FormarLista(View v){
ArrayList<Item> objects = new ArrayList<>();
objects.add(new Item("Produto 1", 5.6, 18));
objects.add(new Item("Produto 2", 16.9, 12));
objects.add(new Item("Produto 3", 1.2, 200));
ListAdapterList customAdapter = new ListAdapterList(this, R.layout.produtos_item, objects);
Lista.setAdapter(customAdapter);
}
}
Error console
E/ArrayAdapter: You must supply a resource ID for a TextView
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView