@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("currentOffset", demoUtils.currentOffset);
outState.putInt("itemCount", adapter.getCount());
for (int i = 0; i < adapter.getCount(); i++) {
outState.putParcelable("item_" + i, (Parcelable) adapter.getItem(i));
}
}
@Override
protected void onRestoreInstanceState(@NotNull Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
demoUtils.currentOffset = savedInstanceState.getInt("currentOffset");
int count = savedInstanceState.getInt("itemCount");
List<DemoItem> items = new ArrayList<>(count);
for (int i = 0; i < count; i++) {
items.add((DemoItem) savedInstanceState.getParcelable("item_" + i));
}
adapter.setItems(items);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.one_column) {
setNumColumns(1);
} else if (id == R.id.two_columnns) {
setNumColumns(2);
} else if (id == R.id.three_columns) {
setNumColumns(3);
} else if (id == R.id.four_columns) {
setNumColumns(4);
} else if (id == R.id.five_columns) {
setNumColumns(5);
} else if (id == R.id.onetwenty_dp_columns) {
setColumnWidth(120);
} else if (id == R.id.twoforty_dp_columns) {
setColumnWidth(240);
} else if (id == R.id.append_items) {
adapter.appendItems(demoUtils.moarItems(50));
} else if (id == R.id.reset_items) {
demoUtils.currentOffset = 0;
adapter.setItems(demoUtils.moarItems(50));
} else if (id == R.id.reordering) {
listView.setAllowReordering(!listView.isAllowReordering());
item.setTitle(listView.isAllowReordering() ? "Prevent reordering" : "Allow reordering");
} else if (id == R.id.debugging) {
int index = listView.getFirstVisiblePosition();
View v = listView.getChildAt(0);
int top = (v == null) ? 0 : v.getTop();
listView.setDebugging(!listView.isDebugging());
item.setTitle(listView.isDebugging() ? "Disable debugging" : "Enable debugging");
listView.setAdapter(adapter);
listView.setSelectionFromTop(index, top);
} else if (id == android.R.id.home) {
drawerLayout.openDrawer(GravityCompat.START);
}
return super.onOptionsItemSelected(item);
}