Celta Celta - 6 months ago 232
Android Question

Android ListView selected item stay highlighted

I have an

XML
with two
ListView
, one with a list of clients filled by a select query (
lv_cli
) and the other with the details of the client selected (
lv_cli_det
).
I would like to keep the client selected in the
lv_cli
while the
lv_cli_det
show the details.

XML:

<ListView
android:id="@+id/cli_lista"
android:layout_width="512dp"
android:layout_height="wrap_content"
android:fadeScrollbars="false"
>
</ListView>

<ListView
android:id="@+id/cli_lista_det"
android:layout_width="512dp"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/cli_lista"
android:fadeScrollbars="false" >
</ListView>


Java:

Cursor cursor = db.rawQuery("Select NrCl||';'||Nome From Clientes", null);
final ListView t = (ListView)findViewById(R.id.cli_lista);
ArrayAdapter<String> myarrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, listItems);
t.setAdapter(myarrayAdapter);

final ListView td = (ListView)findViewById(R.id.cli_lista_detalhe);
final ArrayAdapter<String> myarrayAdapter2 = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, listItems2);

t.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String item = ((TextView)view).getText().toString();
String[] strArray = item.split("\\;");

cli.load(strArray[0].toString());
td.setAdapter(myarrayAdapter2);
listItems2.clear();
listItems2.add("Nome: " + cli.getNome());
listItems2.add("Morada: " + cli.getMorada());
listItems2.add("Localidade: " + cli.getLoca());
listItems2.add("Código Postal: " + cli.getCp());
listItems2.add("Pais: " + cli.getPais());
listItems2.add("Nif: " + cli.getNif());
listItems2.add("Tel: " + cli.getTel());
listItems2.add("Tlm: " + cli.getTlm());
listItems2.add("Tipo Preço: " + cli.getTipoPvn());
listItems2.add("Cond. Pagamento: " + cli.getCpg());
listItems2.add("Obs: " + cli.getObs());
td.setAdapter(myarrayAdapter2);
myarrayAdapter2.notifyDataSetChanged();
}
});

Answer

To hold the color of listview item when you press it, include the following line in your listview layout:

android:background="@drawable/bg_key"

Then define bg_key.xml in drawable folder like this:

<?xml version="1.0" encoding="utf-8" ?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item 
        android:state_selected="true"
        android:drawable="@color/pressed_color"/>
    <item
        android:drawable="@color/default_color" />
</selector>

Finally, include this in your listview onClickListener:

listView.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,long arg3) {
        view.setSelected(true);
        ... //Anything
    }
});

This way, only one item will be color-selected at any time. You can define your color values in res/values/colors.xml with something like this:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="pressed_color">#4d90fe</color>
    <color name="default_color">#ffffff</color>
</resources>