@Override
protected void initialize() {
ListView lv = (ListView) findViewById(android.R.id.list);
mEntries = new ArrayList<>();
getSupportLoaderManager().initLoader(LOADER, new Bundle(), DefaultEngineAsyncListActivity.this);
ArrayAdapter myAdapter =
new ArrayAdapter<String>(
this, android.R.layout.simple_list_item_1, android.R.id.text1, mEntries) {
private static final int TYPE_EVEN = 0;
private static final int TYPE_ODD = 1;
protected static final int NEAR_END_THRESHOLD = 3;
private OnPositionNearEndListener mNearEndListener =
new OnPositionNearEndListener() {
@Override
public void onNearEnd() {
final Loader l = getSupportLoaderManager().getLoader(LOADER);
if (l != null
&& ((ListDataLoader) l).hasMoreResults()
&& !((ListDataLoader) l).isLoading()) {
l.forceLoad();
}
}
};
public boolean isNearEndOfList(int position) {
return getCount() - position <= NEAR_END_THRESHOLD;
}
@Override
public int getViewTypeCount() {
return 2;
}
@Override
public int getItemViewType(int position) {
return position % 2 == 0 ? TYPE_EVEN : TYPE_ODD;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (mNearEndListener != null && isNearEndOfList(position)) mNearEndListener.onNearEnd();
View v = super.getView(position, convertView, parent);
if (getItemViewType(position) == TYPE_EVEN)
v.setBackgroundColor(getResources().getColor(R.color.colorAccent));
return v;
}
};
// show the irr view at the 40th position (index starts at 0)
// don't pass a rule engine here but use the default implementation provided by the irr itself
irrDecoAdapter = new IrrAdapterDecorator(this, myAdapter, 39, R.layout.standard_irr_layout);
lv.setAdapter(irrDecoAdapter);
engine = (DefaultRuleEngine) irrDecoAdapter.getUnderlyingRuleEngine();
// change demo description
((TextView) findViewById(R.id.intro)).setText(R.string.default_engine_async_list_intro);
}
@Override
public void onLoadFinished(Loader<List<String>> loader, List<String> data) {
Toast.makeText(
this,
(data.isEmpty() ? "Reached end of list" : "More elements loaded"),
Toast.LENGTH_SHORT)
.show();
mEntries.addAll(data);
irrDecoAdapter.notifyDataSetChanged(true);
}
@Override
void evaluateRules(boolean onlyDump) {
if (!onlyDump) irrDecoAdapter.notifyRuleEngineStateChanged();
super.evaluateRules(onlyDump);
}