Dat Chu Dat Chu - 5 months ago 111
Android Question

BaseAdapter notifyDatasetChanged() called but getView() is never called

I have a custom adapter that visualize each row in the list of Orders.

public class OrderRowAdapter extends BaseAdapter implements OnClickListener {
OrderList items_;
LayoutInflater inflater_;
int list_view_resource_id_;
private final String TAG = "OrderRowAdapter";

public OrderRowAdapter(Context context, int list_view_resource_id,
OrderList items) {
this.list_view_resource_id_ = list_view_resource_id;
this.items_ = items;
this.inflater_ = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

public Object getItem(int position) {
return items_.getOrders(position);
}

public View getView(int position, View convertView, ViewGroup parent) {
Log.d(TAG, "View updated for item in position = " + position);

View v = convertView;
if (v == null) {
v = inflater_.inflate(list_view_resource_id_, parent);
}

Order item = items_.getOrders(position);
if (item != null) {
TextView order_info_tv = (TextView) v.findViewById(R.id.order_info);
TextView order_status_tv = (TextView) v.findViewById(R.id.order_status);

if (order_info_tv != null) {
order_info_tv.setText(
String.format("For customer: %s\nTotal of %d items", item.getCustomerId(), item.getItemsCount()));
}
if (order_status_tv != null) {
order_status_tv.setText("Status: " + getStatusText(item.getStatus()));
}
}
return v;
}

public int getCount() {
if (items_ == null) {
Log.d(TAG, "Null so get count returned 0");
return 0;
} else {
Log.d(TAG, "Get count returned " + items_.getOrdersCount());
return items_.getOrdersCount();
}
};


After querying new list of orders from a web service, I want to update the content of the ListView, so I have my Activity does the updating before calling notifyDataSetChanged()

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.orders);

initThreading();
findViews();
setUrls();

// Load the list of order from disk
try {
order_list_ = OrderList.parseFrom(new FileInputStream(
"/sdcard/orderList.bin"));
} catch (FileNotFoundException e) {
Log.e(TAG, "Cannot find the file", e);
} catch (IOException e) {
Log.e(TAG, "Cannot read the file", e);
}

order_row_adapter_ = new OrderRowAdapter(OrderActivity.this,
R.layout.order_row, order_list_);
orders_listview_.setAdapter(order_row_adapter_);

// Request new updates from the server
updateOrderInformation(-1);
}

public void updateOrders(InputStream new_order_stream) {
Log.d(TAG, "Updating order UI");
try {
order_list_.parseFrom(new_order_stream);
} catch (IOException e) {
Log.e(TAG, "IOException" , e);
}

runOnUiThread(new Runnable() {
public void run() {
guiUpdateOrders();
}
});
}

private void guiUpdateOrders() {
order_row_adapter_.notifyDataSetChanged();
Log.d(TAG, "Dataset notified that it has changed. GUI update anytime now.");
}


But, the getView() method of OrderRowAdapter is never called. The ListView is never updated.

Answer

It turns out the problem with my getView() not being called is because it is not visible. My layout xml has the upper TextView with fill_parent for its height. Thus the entire view only has that single TextView visible.

Solution: check the graphical view of the layout in question to make sure the ListView is visible.

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