I have created one sstatic Arraylist and displayed the data in listview using the custom adapter. My requirement is when i click on the listitem, i have to show the details of particular listitem in the next screen. How can i pass the selected listitem data from listview screen to details screen.
I have tried to pass the data using the parcelable concept. But when I click on the listitem, i am getting "Null pointer exception"
Any complete example will be very helpful.
Thanks in advance.
It can be acheived in following way.I'm assuming that your list item is a text view.
Add onItemClick Listener to your listview,get Selected Item's text on click and pass it with itent extras to NextActivity.
listview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View p_view,
int p_pos, long arg3) {
TextView text= (TextView ) p_view.findViewById(R.id.textview1); //id of textview from layout file that you are inflating.
String mytext=text.getText();
Intent i = new Intent(Context context,NextActivity.class);
i.putExtra("text",mytext);
startActivity(i);
}
});
And on the next activity,retreive the text from extras.
Bundle extras = getIntent().getExtras();
String text_value= extras.getString("text");
Related
I have a listView and setting multiChoiceModeListener on it. It works fine. Now to play an audio item inside the listView I have written
ViewHolder.AuidoXmlLayoutItem.setOnClickListener({...playAudioCode...});
inside the getView of listView adapter class.
because of this now the multiChoiceModeSelection dosent not show selection of listItem when I longPress on AuidoXmlLayoutItem and hence does not show ContextualActionBar.
How can I keep the onClick of the audio item layout and still allow ContextualActionBar to appear on long click of audio item layout
Try to use OnItemClickListener rather than OnClickListener. Follow this way,
view.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// playAudioCode
// change the checkbox state
ViewToChecked checkedTextView = ((ViewToChecked)view);
checkedTextView.setChecked(!checkedTextView.isChecked());
}
});
You might get a concept.
I'm probably doing something else wrong but I've followed examples given here:
How to remove a row from the Cell Table
and
GWT get CellTable contents for printing or export
to accomplish my goal and the result is close but not quite right.
I have a page with two widgets. The first wiget contains a CellTable that uses an aSync ListDataProvider to pull results and populate a table. The table has a selection change event handler associated with it that loads further details about the selected item into the second widget below it.
public OrderAdminTable() {
selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
#Override
public void onSelectionChange(SelectionChangeEvent event) {
OrderAdminListProxy selected = selectionModel.getSelectedObject();
if (selected != null && orderSnapShot != null) {
orderSnapShot.loadSnapShot(selected);
}
}
});
initTable();
this.addStyleName("order-list fixed_headers BOM");
this.setSelectionModel(selectionModel);
}
Once the second widget has loaded the details about the selected item, the user can remove the item from the table/list by clicking a button in the RootPanel that is the parent of both widgets.
searchView.getCmdReview().addClickHandler(new ClickHandler() {
#Override public void onClick(ClickEvent event) {
searchView.getOrderAdminSnapshot().reviewOrder();//this line calls a web service that deletes the item from the server data
dataProvider.getList().remove(searchView.getOrderAdminSnapshot().getSelectedOrder());
for(int i=0;i<table.getRowCount();i++){
TableRowElement row = table.getRowElement(i);
for(int j=0;j<row.getCells().getLength();j++){
if(row.getCells().getItem(j).getInnerText().contains(searchView.getOrderAdminSnapshot().getSelectedOrder().getSalesOrderNumber())){
row.setAttribute("removed", "true");
row.addClassName("hidden");
}
}
}
}
});
This all works fine until you select another item in the table. When that happens, the selection change event seems to redraw the table and remove my custom attribute and class from the previously selected item. This makes it appear in the list again.
The ultimate goal here is to avoid a round trip to the server to pull new results when you remove an item from the list. The line "searchView.getOrderAdminSnapshot().reviewOrder();" makes a web service call that removes the item from the data on the server side so it does not appear in subsequent reloads.
Is there some way to force the selection change event to maintain the state of the table row that was previously selected? Is there a better way to remove the selected item from the list? Any advice would be appreciated.
Once you remove the object from the list dataProvider.getList().remove, it should disappear from the table. There is no need to hide the row - this row should be gone. So your loop should never find it.
I want to create a listview from which we can use onclick and in which on long press a Context menu comes out. the code is
public class MainActivity extends ListActivity{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String quizlist[]={"Normal","MCQ 2 Options","MCQ 3 options","MCQ 4 Options"};
ArrayAdapter<String> ab=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,quizlist);
setListAdapter(ab);
}
}
Thanks in advance
You can register an AdapterView.OnItemLongClickListener on the ListView. So what you need to do is find the list view:
in onCreate try
((ListView) getView).setOnItemLongKlickListener(...)
or
((ListView) findViewById(<the id of your list view>).setOnItemLongKlickListener(...)
When implementing an OnItemLongClickListener you will have to override the onItemLongClick method:
From the documentation:
public abstract boolean onItemLongClick (AdapterView<?> parent, View view, int position, long id)
Added in API level 1 Callback method to be invoked when an item in
this view has been clicked and held. Implementers can call
getItemAtPosition(position) if they need to access the data associated
with the selected item.
Parameters
parent The AbsListView where the click happened
view The view within the AbsListView that was clicked
position The position of the view in the list
id The row id of the item that was clicked
Returns true if the callback consumed the long click, false otherwise
So, parent is your ListView. view is the view of the *long clicked' list item. position is the position inside the list and thus also the position in your array. For id I am not sure whether the default implementations returns a constant or the position.
I'm using UploadItem, RadioGroupItem and some other widgets. RadioButton is having onChangeHandler which will decide what all other components need to be displayed. I've uploaded some file using UploadItem. Then I changed the radio button selection. On changing the radio button, required widgets are getting displayed properly but whatever file I'd selected using UploadItem is going away. Fresh UploadItem widget is getting displayed. In other words page is getting refreshed.
My requirement is whenever I change radio button option, required widget should displayed along with that whatever file I had selected using UploadItem should remain same.
My Code is something like this:
UploadItem upload = new UploadItem();
RadioGroupItem radioGroup = new RadioGroupItem();
HashMap map = new HashMap();
map.put("option1","option1");
map.put("option2","option2");
radioGroup.setValueMap(map);
TextItem textbox = new TextItem();
radioGroup.addChangeHandler(new ChangeHandler(){
public void onChanged(ChangedEvent event) {
String radioValue =((String)event.getValue());
if(radioValue.equalsIgnoreCase("option2")){
textbox.show();
}else{
textbox.hide();
}
}
});
Add all created widgets to DynamicForm object using dynamicForm.setFields(all created widgets)
Changing the radio button should hide and show the textBox. But while doing that page is getting refreshed and whatever file we had selected using UploadItem is lost.
As per the documentation for hide() and show() of FormItem class, invocation of any of these methods, will cause the DynamicForm to be redrawn.
So it may cause the problem you're getting.
To overcome this issue, I would suggest you to put UploadItem in a separate DynamicForm.
fire an event on radio Selection change as
radioButton.addListener(Events.Change, new Listener<BaseEvent>() {
#Override
public void handleEvent(BaseEvent be) {
if(radioButton.getValue()){
//fire an event here for ur widget
}
}
});
Im populating a table using ListView component in wicket.The last column of my table is button. So for each row I'll have a button in the last column.What I'm trying to implement is onlick of the button I need to delete the appropriate row. So for this I need to get the current index of the list on click of button. How to achieve/get this ?
I would extend Ajax button and pass the row reference (item) in the constructor...then you can do anything you want..by overriding the onSubmit method
Example:
private class SpecialButton extends AjaxButton {
final Item<Object> rowItem;
public SpecialButton(final String id, final Item<Object> rowItem) {
super(id);
this.rowItem = rowItem;
}
#Override
protected void onSubmit(final AjaxRequestTarget target, final Form<?> form) {
// here you cand do everything you want with the item and the model object of the item.(row)
Object object = rowItem.getModelObject();
}
}
You should replace Object from Item<Object> with your reapeater model. After creating this private class you can reuse it for every row in your repeater.
If you want to delete that row you just have to remove the model from the list used to generate the repeater and refresh the repeater container(Wicket does not allow you to refresh the repeater by adding it to the target...instead you have to add the repeater continer.)
Have a look at the repeaters Wicket Examples page to understand how to use ListView and other repeaters:
http://www.wicket-library.com/wicket-examples/repeater/
You can get the current index of the list from item.getIndex()
protected void populateItem(final ListItem<T> item) {
int index = item.getIndex();
...
Look here for inspirations on how to do it properly (without index):
Wicket ListView not refreshing