How to select a particular row from the java listView

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How to select a particular row from the java listView

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#1 by (2 votes)

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How do I get the row id of a listView? The idea is this: before grabbing the selected line, I'll work with all the lines I'm trying.

aList = new ArrayList<HashMap<String,String>>();        

for(int i=0;i<countries.length;i++){
        HashMap<String, String> hm = new HashMap<String,String>();
    hm.put("txt", getString(countries[i]));

    aList.add(hm);        
}

String[] from = { "txt" };


int[] to = { R.id.txt};        


SimpleAdapter adapter = new SimpleAdapter(getActivity().getBaseContext(), aList, R.layout.listview_layout, from, to);       

        setListAdapter(adapter);

...

OnItemClickListener listener = new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, final int arg2, long arg3) {



                for(int i=0;i< arg0.getCount();i++){

                não sei fazer o setText(); em todos os 'R.id.txt'...    

            }

If someone has an idea how to do it, I appreciate the help.

java android

asked by anonymous 05.12.2014 / 03:29

1 answer

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score 2 · Accepted Answer

First check your event logic, you are using an event to select an item from the list, I did not understand why to change the rest of the items.

Before changing the list item, you need to know what kind of items it has, or you have created a simple list with a String array, or you may have loaded it with objects (and have customized ListView items).

EXAMPLE WITH STRINGS:

Declare an ArrayList of global strings and ArrayAdapter in class

ArrayList<String> arrayItens;
ArrayAdapter<String> adapter;

//chame esse método no inicio da atividade, para carregar a lista.
private void carregaLista(){
        arrayItens = new ArrayList<String>();
        arrayItens.add("um");
        arrayItens.add("dois");
        arrayItens.add("tres");
        //Cria um adapter e o referencia com o arrayItens
        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,arrayItens);
        //seta sua ListView com o adapter que está contendo seu array
        lvLista.setAdapter(adapter);
        //uma vez setado o adapter do seu ListView, 
        //você não precisa mais trabalhar diretamente com o ListView para manipular seus dados, 
        //você trabalha diretamente na fonte de dados que seria o arrayItens e o adapter. 
    }

In the OnItemClickListener event, change the following lines.

@Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
        //modifica a string na posicao exata do arrayList que esta referenciado pelo adapter
        arrayItens.set(position, "esse numero foi selecionado"); //esse texto vai aparecer na tela no lugar do numero.
        //com o arrayList modificado o adapter manda atualizar todas suas referencias com algum componente gráfico que no caso é o ListView.
        adapter.notifyDataSetChanged(); //atualiza o ListView
}

If you need to make the change to all items, you can make a for in the arrayItems. and after for do not forget to call the notifyDataSetChanged method (call this method outside of the for loop) to update the listview on the screen.