The question is simple, as it has already been discussed here - extensively! -, about Listview with checkboxes loosing state after scrooling or unable to maintain it's state. In my case, when a scroll out of the view, the checked boxs become unckecked. In this post: Listview, custom adapter and checkboxes, I almost achieved the desire behaviour; however, it's using ArrayList, and I've read that the number of redraws this implementation makes, it's worth when you have a very long list... I used more than 20 implementations available here. Unfortunately, I was unable to find out why is not working. So, please have patience with me. I'll post only what I believe is fundamental to my problem. Below ShowChosenItensFromCategoriaActivity. Note: I'm passing the dbAdapter along with the SimpleCursorAdapter.
public class ShowChosenItensFromCategoriaActivity1 extends AppCompatActivity
{
private ListView mListView;
private SimpleCursorAdapter mCursorAdapter;
private Cursor mCursor;
private Bundle bundle;
private DBAdapter dbAdapter;
private int CATEGORIA_ID;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
bundle = this.getIntent().getExtras();
CATEGORIA_ID = bundle.getInt("CATEGORIA_ID");
setContentView(R.layout.show_all_produtos_from_chosen_categoria);
dbAdapter = new DBAdapter(this);
dbAdapter.open();
mCursor = dbAdapter.getChosenProdutosFromCategoria(CATEGORIA_ID);
String[] From = new String[]{"produtoname", "checked"};
int[] To = new int[]{R.id.idlistitem, R.id.idcheck};
mCursorAdapter = new ShowChosenItensFromCategoriaAdapter1(this,
R.layout
.show_all_produtos_from_chosen_categoria_row,
mCursor, From, To, 0, dbAdapter);
mListView = (ListView) findViewById(R.id.produtos_listview);
mListView.setAdapter(mCursorAdapter);
}
}
Now the show_all_produtos_from_chosen_categoria.xml, the method getChosenProdutosFromCategoria(CATEGORIA_ID) and it's .show_all_produtos_from_chosen_categoria_row.xml.
Code for: show_all_produtos_from_chosen_categoria.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<ListView
android:id="@+id/produtos_listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/toolbar"
android:layout_marginBottom="@dimen/list_padding"
android:layout_marginTop="@dimen/list_padding"
android:background="@color/lime_100"
android:padding="@dimen/list_padding"
android:scrollbarStyle="outsideOverlay"
tools:listitem="@layout/show_all_produtos_from_chosen_categoria_row"/>
</RelativeLayout>
Code for getChosenProdutosFromCategoria(CATEGORIA_ID):
public Cursor getChosenProdutosFromCategoria(int categoriaID)
{
mCursor = mDB.rawQuery(
"SELECT l._id, l.listaprodutoid as produtoID, p.produtoname as produtoname, " +
"l.listacheckbox as checked " +
"FROM tbllistadecompras l, tblprodutos p WHERE l.listaprodutoid = p._id and " +
"l.listacategoriaid=" + categoriaID + " ORDER BY p.produtoname", null);
if (mCursor != null) mCursor.moveToFirst();
assert mCursor != null;
return mCursor;
}
Code for: show_all_produtos_from_chosen_categoria_row.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:background="?android:attr/activatedBackgroundIndicator"
android:orientation="horizontal"
tools:context=".ShowChosenItensFromCategoriaActivity">
<TextView
android:id="@+id/idlistitem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:elegantTextHeight="true"
android:ellipsize="end"
android:scrollHorizontally="false"
android:textColor="@color/blue"
android:textSize="20sp"/>
<CheckBox
android:id="@+id/idcheck"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_marginEnd="10dip"
android:layout_marginStart="4dip"
android:focusable="false"
android:focusableInTouchMode="false"
android:gravity="center">
</CheckBox>
</RelativeLayout>
And now, the biggest problem, the adapter ShowChosenItensFromCategoriaAdapter. I've tried newView/bindView and getView alone. Here, I inserted the getView: method:
class ShowChosenItensFromCategoriaAdapter extends SimpleCursorAdapter
{
private DBAdapter dbAdapter;
private final Context context;
public ShowChosenItensFromCategoriaAdapter1(Context context, int
layout, Cursor c, String[] from, int[] to, int flags,DBAdapter dbAdapter)
{
super(context, layout, c, from, to, flags);
this.context = context;
this.dbAdapter = dbAdapter;
dbAdapter.open();
}
@Override
public View getView(final int position, View convertView, ViewGroup
parent)
{
ViewHolder viewHolder;
final int auxProdutoID; // has to be, to be used inside the
checkbox.method
if (mCursor.moveToPosition(position))
{
if (convertView == null)
{
LayoutInflater inflator = (LayoutInflater)
content.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
viewHolder = new ViewHolder();
viewHolder.produtoID =
mCursor.getInt(mCursor.getColumnIndex("produtoID"));
auxProdutoID = viewHolder.produtoID;
viewHolder.textviewProduto = (TextView)
convertView.findViewById(R.id.idlistitem);
viewHolder.checkBox = (CheckBox)
convertView.findViewById(R.id.idcheck);
viewHolder.checkBox.setOnCheckedChangeListener(
new CompoundButton.OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(CompoundButton
buttonView,boolean isChecked)
{
dbAdapter.setCheckBox(auxProdutoID, isChecked ? 1
: 0);
viewHolder.checkBox.setSelected(isChecked);
//int getPosition = (Integer)
buttonView.getTag();
}
});
convertView.setTag(viewHolder);
}
else
{
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.checkBox.setTag(position)
viewHolder.textviewProduto.setText(
mCursor.getString(mCursor.getColumnIndex("produtoname")));
viewHolder.checkBox.setChecked(
mCursor.getInt(mCursor.getColumnIndex("checked")) == 1);
return convertView;
}
}
}
