Hello android enthusiasts,
I noticed a pretty strange behavior today. It seems as if the number
of executions of an overriden getView() methode (of
SimpleCursorAdapter) is correlated to the number of LinearLayouts (the
Spinner widget that uses this adapter) it is nested in.
The following code illustrates this:
############################
####DemonstrateBug.java#####
############################
public class DemonstrateBug extends Activity {
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.bug);
String[] from = new String[] { People.NAME };
int[] to = { R.id.tv_name };
Cursor cursor = managedQuery(People.CONTENT_URI, new String[] {
People._ID, People.NAME }, null, null);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.in_spinner, cursor, from, to) {
@Override
public View getView(int position, View convertView, ViewGroup
parent) {
Log.d("BUG", "getView for posititon " + position);
return super.getView(position, convertView, parent);
}
};
Spinner s = (Spinner) findViewById(R.id.spinner);
s.setAdapter(adapter);
s.setSelection(2);
}
}
###############################
###res/layout/bug.xml############
###############################
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:orientation="vertical">
<LinearLayout android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<Spinner android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
Output:
...
D/ActivityThread( 5979): Installing external provider
contacts;call_log:
com.google.android.providers.contacts.ContactsProvider
D/BUG ( 5979): getView for posititon 0
D/BUG ( 5979): getView for posititon 0
D/BUG ( 5979): getView for posititon 2
...
Expected Output:
...
D/ActivityThread( 5979): Installing external provider
contacts;call_log:
com.google.android.providers.contacts.ContactsProvider
(maybe: "D/BUG ( 5979): getView for posititon 0" because of
initialization)
D/BUG ( 5979): getView for posititon 2
....
If i nest another LinearLayout arround the Spinner, getView will be
executed 4 times. After that I can nest as many Views as I like,
getView will not be called more than 4 times.
I have 2 problems with the bug:
1) I have a pretty complicated layout and I load and scale an image in
getView. When getView is executed 4 times it takes pretty long
(because the image will be scaled and loaded 4 times).
2) Even if I should not do resource intensive stuff in getView() it
creates side effects because 1 time getView is called for the right
position, the other times it is called for the first item in the
spinner.
I have a similar issue with ListView in a ListActivity. But it is
harder to reproduce. I hope gaining insight in this behavior will
reveal insight in the other one as well.
Can you reproduce said behavior? Should I file a bug report?
Bye bye,
Valentin
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