I want to use my getfilter() i implemented but from action bar in order to search my listview . But dont know why the app keeps on giving nullpointer i cant understand the error as well .
Here's my code calling my custom getfilter implented inside my coustom adapter.
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
ListView itcItems;
DataBaseHandler db;
private SearchView mSearchView;
//private EditText mStatusView;
public DummySectionFragment() {
}
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
//MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.option_menu, menu);
//getMenuInflater().inflate(R.menu.action, menu);
searchView = (SearchView) menu.findItem(R.id.Search).getActionView();
SearchManager searchManager = (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE);
searchView.setSearchableInfo(searchManager.getSearchableInfo(getActivity().getComponentName()));
searchView.setIconifiedByDefault(false);
SearchView.OnQueryTextListener queryTextListener = new SearchView.OnQueryTextListener()
{
#Override
public boolean onQueryTextChange(String newText)
{
// this is your adapter that will be filtered
adapter.getFilter().filter(newText);
return true;
}
#Override
public boolean onQueryTextSubmit(String query)
{
// this is your adapter that will be filtered
adapter.getFilter().filter(query);
return true;
}
};
searchView.setOnQueryTextListener(queryTextListener);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
setHasOptionsMenu(true);
View rootView = inflater.inflate(R.layout.common_listview,
container, false);
setHasOptionsMenu(true);
ActionBar actionbar = getActivity().getActionBar();
getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
actionbar.show();
//getActivity().requestWindowFeature(Window.FEATURE_ACTION_BAR);
//mStatusView = (EditText) rootView.findViewById(R.id.status_text);
itcItems = (ListView) rootView.findViewById(R.id.streamList);
/*MyAsyncTask task = new MyAsyncTask(getActivity());
task.execute("http://findaway.in/card/restlist.xml");
*
*/
db = new DataBaseHandler(getActivity());
if(isOnline(getActivity()))
{
flag=1;
db.delete();
getDataInAsyncTask();
getImage(db);
//db.close();
}
else
{
flag=0;
Toast.makeText(getActivity(), "No internet",
Toast.LENGTH_LONG).show();
try {
db.openDataBase();
} catch (SQLException sqle) {
throw sqle;
}
getDataInDataBase(db);
}
here's my logcat
line 212 is searchView = (SearchView) menu.findItem(R.id.Search).getActionView();
also is it compulsory to implement res/xml/searchable.xml ?? i havnt done that
In onCreateOptionsMenu(), call to super is missing. Consider using super and then using inflater and menu objects.
Related
I'm sorry for this question, but I'm a new in Android developing. I searched in internet, but I don't found any appropriate answer. I have a following code in my custom adapter:
public class ItemsAdapter extends CursorAdapter {
public ItemsAdapter(Context context, Cursor c) {
super(context, c, false);
}
#Override
public void bindView(View view, Context arg1, Cursor cursor) {
ViewHolder viewHolder = (ViewHolder) view.getTag();
viewHolder.title.setText(cursor.getString(cursor
.getColumnIndex("title")));
viewHolder.publishDate.setText(cursor.getString(cursor.getColumnIndex("date_time")));
viewHolder.rssNewsImage.setImageResource(R.drawable.rssnews);
}
#Override
public View newView(Context arg0, Cursor arg1, ViewGroup arg2) {
View view = LayoutInflater.from(mContext).inflate(
R.layout.listview_rssreaderactivity_row, arg2, false);
ViewHolder viewHolder = new ViewHolder();
viewHolder.title = (TextView) view
.findViewById(R.id.tw_title_listview_row_main);
viewHolder.publishDate = (TextView) view.findViewById(R.id.tw_pubDate_listview_row_main);
viewHolder.rssNewsImage = (ImageView) view.findViewById(R.id.imageRssView);
view.setTag(viewHolder);
return view;
}
public class ViewHolder {
TextView title;
TextView publishDate;
ImageView rssNewsImage;
}
}
I want to delete listView item in my custom adapter. Here is my code for click events:
#Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
final int position, long id) {
AlertDialog.Builder itemLongClickdialog = new AlertDialog.Builder(
RssNewsActivity.this);
itemLongClickdialog.setItems(R.array.array_longclick_item,
new OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
I can't delete given item.
How to resolve this problem? I will appreciate all answers.
Try This:
DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User clicked OK button
ItemsAdapter dba = new ItemsAdapter (yourActivity);
dba.open();
dba.remove(_id);
Log.i("TAAG", "removed: "+_id);
dba.close();
cursor.requery();
listview.getadaper().notifyDataSetChanged();
}
});
I need some help in my homework here...
I want to do a listview with itens from editText.. but I dont know how to delete and edit the item, I tryed to use ContextMenu. I will post my code, and if you think that i have to change anything, tell me.. I'm begginer.
private Button bt;
private ListView lv;
private EditText et;
private ArrayList<String> Arraylt = new ArrayList<String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_l);
bt = (Button)findViewById(R.id.bt);
lv = (ListView)findViewById(R.id.lv);
et = (EditText)findViewById(R.id.et);
lv.setOnCreateContextMenuListener(this);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> adapter, View view,
int posicao, long id) {
Object o = lv.getItemAtPosition(posicao);
et.setText(String.valueOf(o));
bt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addadicionar();
}
});
}
public void addadicionar() {
Arraylt.add(et.getText().toString());
lv.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Arraylt));
et.setText("");
}
hey this is my note pad code it will help you .. have a look
#Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
if (v.getId()==R.id.listView1)
{
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
}
}
#Override
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
switch(item.getItemId()) {
case R.id.edit:
// edit stuff here
return true;
case R.id.delete:
ArrayAdapter <String> adapter=new ArrayAdapter<String>(menu.this,android.R.layout.simple_list_item_1,data);
Cursor cursor2=mydb1.rawQuery("SELECT * FROM notes;", null);
data.remove(info);
lv.setAdapter(adapter);
cursor2.moveToPosition(info.position);
int id= cursor2.getInt(cursor2.getColumnIndex("id"));
mydb1.delete("notes", "id=?", new String[] {Integer.toString(id)});
list(view); // this will refresh my list by calling my display list method here
return true;
default:
return super.onContextItemSelected(item);
}
try to remove the item from listItems(List), then call adapter.notifyDataSetChanged();
try this code :
// note : you need to create xml file in res/menu folder which conatain deleter and editer item
#Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
if (v.getId()==R.id.listView1)
{
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
}
}
#Override
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
switch(item.getItemId()) {
case R.id.Deletar:
// edit stuff here
return true;
case R.id.editar:
ArrayAdapter <String> adapter=new ArrayAdapter<String>(menu.this,android.R.layout.simple_list_item_1,data);
data.remove(info);
lv.setAdapter(adapter);
list(view); // this will refresh my list by calling my display //list method here
return true;
default:
return super.onContextItemSelected(item);
}
Yes, I win!.. now, I can edit and delete the item from listview...
private Button bt;
private ListView lv;
private EditText et;
private ArrayList<String> Arraylt = new ArrayList<String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_l);
bt = (Button)findViewById(R.id.bt);
lv = (ListView)findViewById(R.id.lv);
et = (EditText)findViewById(R.id.et);
lv.setOnCreateContextMenuListener(this);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> adapter, View view, int posicao, long id) {
Object o = lv.getItemAtPosition(posicao);
et.setText(String.valueOf(o));
bt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addadicionar();
}
});
}
public void addadicionar() {
Arraylt.add(et.getText().toString());
lv.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Arraylt));
et.setText("");
}
sorry for the bad indent..
I'm trying to implement a viewpager with a PagerSlidingTabStrip instead of a TabView. The viewpager has three tabs in which each listview displays a list of events. The three tabs are called Past, Tonight and Future.
I've set up the slider as the github page suggests:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
View v = inflater.inflate(R.layout.all_events_main_strip, container, false);
// Set up the ViewPager, attaching the adapter and setting up a listener for when the
// user swipes between sections.
pager = (ViewPager) v .findViewById(R.id.pager_main);
tabs = (PagerSlidingTabStrip) v.findViewById(R.id.tabs);
adapter = new MyPagerAdapter(getFragmentManager());
pager.setAdapter(adapter);
tabs.setViewPager(pager);
// Set Present tab as default
pager.setCurrentItem(1);
return v;
}
When the app starts the Main Activity adds for the first time this fragment and everything works great. 3 swipeable tabs with 3 listviews. (c.f. code section)
Here is the problem:
I've noticed that when I press the back button and replace the fragment again, in order to reopen the viewpager, the tab in the middle doesn't show any listview. If I swype left or right the content in the other tabs is loaded and displayed but the Present Tab remains empty.
When I debug the ToNightEvents ListFragment isn't called at all.
Do you guys have any suggestions to solve the problem?
The code:
The code is structured as follows: After the onCreateView I've added an OnDestroyView method to remove the fragment but it didn't work... Then in the fragmentPagerAdapter each page is called as a fragment in the getItem method. Finally at the end of the code you can see the three ListFragment classes in which a listview is populated through an AsyncTask
public class FragmentAllEvents extends Fragment
{
private static final String TAG_UID = "uid";
private static final String TAG_LOGO = "logo";
private static final String TAG_POKUID = "pokuid";
static ArrayList<HashMap<String, String>> userList;
ArrayList<HashMap<String, String>> userListTotal;
private final Handler handler = new Handler();
HashMap<String, String> userSelected;
EventsFunctions eventsFunctions;
UserFunctions userFunctions;
static ListView lv;
ActionBar actionBar;
MyPagerAdapter adapter;
ViewPager pager;
PagerSlidingTabStrip tabs;
private Drawable oldBackground = null;
private int currentColor = 0xFF666666;
//Context context = this;
#Override public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
// Set up the action bar.
actionBar = getActivity().getActionBar();
actionBar.setHomeButtonEnabled(true);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
View v = inflater.inflate(R.layout.all_events_main_strip, container, false);
pager = (ViewPager) v .findViewById(R.id.pager_main);
tabs = (PagerSlidingTabStrip) v.findViewById(R.id.tabs);
adapter = new MyPagerAdapter(getFragmentManager());
pager.setAdapter(adapter);
tabs.setViewPager(pager);
pager.setCurrentItem(1);
return v;
}
#Override
public void onDestroyView()
{
super.onDestroyView();
getActivity().getSupportFragmentManager().beginTransaction().remove(this).commit();
}
public static class MyPagerAdapter extends FragmentPagerAdapter
{
public MyPagerAdapter(FragmentManager fm)
{
super(fm);
}
#Override
public Fragment getItem(int i)
{
switch (i)
{
case 0:
return new PastEvents();
case 1:
return new ToNightEvents();
case 2:
return new FutureEvents();
/*default:
// The other sections of the app are dummy placeholders.
return new ToNightEvents();
*/
}
return null;
}
/**
* A fragment that launches past events list.
*/
public static class PastEvents extends ListFragment implements
PullToRefreshAttacher.OnRefreshListener
{
private ListView pastList;
private PullToRefreshAttacher mPullToRefreshAttacher;
ProgressBar progress;
String tabTime;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View pastView = inflater.inflate(R.layout.pastlist, container, false);
progress = (ProgressBar) pastView.findViewById(R.id.loading_spinner_past);
tabTime="past";
pastList = (ListView) pastView.findViewById(android.R.id.list);
// Now get the PullToRefresh attacher from the Activity. An exercise to the reader
// is to create an implicit interface instead of casting to the concrete Activity
mPullToRefreshAttacher = ((Home) getActivity()).getPullToRefreshAttacher();
// Now set the ScrollView as the refreshable view, and the refresh listener (this)
mPullToRefreshAttacher.addRefreshableView(pastList, this);
new AsyncLoadEvents(getActivity(), progress, pastList, mPullToRefreshAttacher).execute(tabTime);
return pastView;
}
#SuppressWarnings("unchecked")
#Override
public void onListItemClick(ListView listView, View view, int position, long id)
{
super.onListItemClick (listView, view, position, id);
HashMap<String, String> map = (HashMap<String, String>) getListView().getItemAtPosition(position);
//Log.e("AttendList Report", "Clicked list item: " + position +" Content: \n" + map.get(TAG_ID).toString());
Log.e("PastList Report", "Clicked list item: " + position +" Event's content: \n" + map.get(TAG_UID).toString());
Intent intent = new Intent(getActivity(), SingleEventActivity.class);
intent.putExtra("pokuid",map.get(TAG_POKUID)); // Maybe remove attribute toString();
intent.putExtra("uid", map.get(TAG_UID));
intent.putExtra("logo",map.get(TAG_LOGO));
getActivity().startActivity(intent);
}
#Override
public void onRefreshStarted(View view)
{
new AsyncLoadEvents(getActivity(), progress, pastList, mPullToRefreshAttacher).execute(tabTime);
}
}
/**
* A fragment that launches future event list.
*/
public static class FutureEvents extends ListFragment implements
PullToRefreshAttacher.OnRefreshListener
{
private ListView futureList;
private PullToRefreshAttacher mPullToRefreshAttacher;
ProgressBar progress;
String tabTime;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View futureView = inflater.inflate(R.layout.futurelist, container, false);
progress = (ProgressBar) futureView.findViewById(R.id.loading_spinner_future);
tabTime = "future";
futureList = (ListView) futureView.findViewById(android.R.id.list); //change to attendlist if needed
// Now get the PullToRefresh attacher from the Activity. An exercise to the reader
// is to create an implicit interface instead of casting to the concrete Activity
mPullToRefreshAttacher = ((Home) getActivity()).getPullToRefreshAttacher();
// Now set the ScrollView as the refreshable view, and the refresh listener (this)
mPullToRefreshAttacher.addRefreshableView(futureList, this);
new AsyncLoadEvents(getActivity(), progress, futureList, mPullToRefreshAttacher).execute(tabTime);
return futureView;
}
#SuppressWarnings("unchecked")
#Override
public void onListItemClick(ListView listView, View view, int position, long id)
{
super.onListItemClick (listView, view, position, id);
HashMap<String, String> map = (HashMap<String, String>) getListView().getItemAtPosition(position);
Log.e("PastList Report", "Clicked list item: " + position +" Event's content: \n" + map.get(TAG_UID).toString());
Intent intent = new Intent(getActivity(), SingleEventActivity.class);
intent.putExtra("pokuid",map.get(TAG_POKUID)); // Maybe remove attribute toString();
intent.putExtra("uid", map.get(TAG_UID));
intent.putExtra("logo",map.get(TAG_LOGO));
getActivity().startActivity(intent);
}
#Override
public void onRefreshStarted(View view)
{
new AsyncLoadEvents(getActivity(), progress, futureList, mPullToRefreshAttacher).execute(tabTime);
}
}
/**
* A fragment that launches future event list.
*/
public static class ToNightEvents extends ListFragment implements
PullToRefreshAttacher.OnRefreshListener
{
private ListView tonightList;
private PullToRefreshAttacher mPullToRefreshAttacher;
ProgressBar progress;
String tabTime;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View tonightView = inflater.inflate(R.layout.tonightlist, container, false);
progress = (ProgressBar) tonightView.findViewById(R.id.loading_spinner_tonight);
tabTime = "tonight";
tonightList = (ListView) tonightView.findViewById(android.R.id.list); //change to attendlist if needed
// Now get the PullToRefresh attacher from the Activity. An exercise to the reader
// is to create an implicit interface instead of casting to the concrete Activity
mPullToRefreshAttacher = ((Home) getActivity()).getPullToRefreshAttacher();
// Now set the ScrollView as the refreshable view, and the refresh listener (this)
mPullToRefreshAttacher.addRefreshableView(tonightList, this);
new AsyncLoadEvents(getActivity(), progress, tonightList, mPullToRefreshAttacher).execute(tabTime);
return tonightView;
}
#SuppressWarnings("unchecked")
#Override
public void onListItemClick(ListView listView, View view, int position, long id)
{
super.onListItemClick (listView, view, position, id);
HashMap<String, String> map = (HashMap<String, String>) getListView().getItemAtPosition(position);
Log.e("PastList Report", "Clicked list item: " + position +" Event's content: \n" + map.get(TAG_UID).toString());
Intent intent = new Intent(getActivity(), SingleEventActivity.class);
intent.putExtra("pokuid",map.get(TAG_POKUID)); // Maybe remove attribute toString();
intent.putExtra("uid", map.get(TAG_UID));
intent.putExtra("logo",map.get(TAG_LOGO));
getActivity().startActivity(intent);
}
#Override
public void onRefreshStarted(View view)
{
new AsyncLoadEvents(getActivity(), progress, tonightList, mPullToRefreshAttacher).execute(tabTime);
}
}
public String[] titles=
{
"Past",
"Tonight",
"Future"
};
#Override
public int getCount()
{
return titles.length;
}
#Override
public CharSequence getPageTitle(int position)
{
return titles[position];
}
}
}
This would normally work if you were in an Activity, however I guess you are in a Fragment since the code you posted is the method onCreateView(). The problem is that you are trying to use the FragmentManager of the Activity and you should be using the Fragment's FragmentManager. This FragmentManager is not what you need. Try this instead:
adapter = new MyPagerAdapter(getChildFragmentManager());
I think I'm a little bit late but if anyone happens to have the same error here is the solution =)
Q.
The following fixed it for me:
Add an OnBackStackChangedListener to the fragment manager.
In the onBackStackChanged method, get references to both the ViewPager and the PagerSlidingTabStrip (pager and tabs in your example). If the appropriate fragment is currently active, do the following:
pager.invalidate();
tabs.invalidate();
pager.setAdapter(new MyPagerAdapter(getFragmentManager()));
tabs.setViewPager(pager);
I"m tring it refresh my listview when my sqllite database is change (when delete or update query).
the querys itself works just fine, but it doesn't update the listview layout, only when i"m exiting the acitvity and renter it the liseview is changing.
I tried the methodes:
notifyDataSetChanged()
requery()
the code of the activiy is:
public class ShowListActivity extends ListActivity {
private ItemsDataSource itemsDataSource;
private String source[] = new String[] {MySQLiteHelper.KEY_NAME, MySQLiteHelper.KEY_QUANTITY, MySQLiteHelper.KEY_CHECKED};
private int dest[] = new int[] {R.id.itemTitle, R.id.itemQuantity, R.id.itemCheck};
public void goBackMethod(View view) {
Intent intent = new Intent(this, MainScreen.class);
startActivity(intent);
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try {
setContentView(R.layout.activity_show_list);
} catch (Exception e) {
e.getMessage();
}
ApplicationController applicationController = (ApplicationController)getApplicationContext();
itemsDataSource = applicationController.itemsDataSource;
final Cursor mCursor = itemsDataSource.getAllItems();
startManagingCursor(mCursor);
CustomCursorAdapter adapter = new CustomCursorAdapter(this, mCursor);
adapter.notifyDataSetChanged();
setListAdapter(adapter);
ListView listView = getListView();
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
selectAction(id);
}
});
}
private void selectAction(final long position) {
Builder builder = new AlertDialog.Builder(this);
builder.setTitle("בחר פעולה");
builder
.setMessage("בחר בפעולה שברצונך לבצע:");
builder.setPositiveButton("עדכן פריט קניה",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//do update
}
});
builder.setNeutralButton("מחק פריט קניה",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
itemsDataSource.deleteItem(position);
Toast toast = Toast.makeText(getBaseContext(), "הפריט הנבחר נמחק בהצלחה", Toast.LENGTH_SHORT);
toast.show();
}
});
builder.setNegativeButton("חזור לרשימת הקניות",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
}
the code of the customadapter is:
public class CustomCursorAdapter extends CursorAdapter implements Adapter {
private Cursor mCursor;
private Context mContext;
private final LayoutInflater mInflater;
public CustomCursorAdapter(Context context, Cursor c) {
super(context, c);
mInflater=LayoutInflater.from(context);
mContext=context;
}
#Override
public void bindView(View view, Context context, Cursor cursor) {
TextView itemTitle= (TextView)view.findViewById(R.id.itemTitle);
itemTitle.setText(cursor.getString(cursor.getColumnIndex(MySQLiteHelper.KEY_NAME)));
TextView itemQuantity = (TextView)view.findViewById(R.id.itemQuantity);
itemQuantity.setText(cursor.getString(cursor.getColumnIndex(MySQLiteHelper.KEY_QUANTITY)));
CheckBox itemCheck = (CheckBox) view.findViewById(R.id.itemCheck);
itemCheck.setChecked(cursor.getInt(cursor.getColumnIndex(MySQLiteHelper.KEY_CHECKED))==1);
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
final View view=mInflater.inflate(R.layout.listview_item_row, parent, false);
TextView itemTitle= (TextView)view.findViewById(R.id.itemTitle);
itemTitle.setText(cursor.getString(cursor.getColumnIndex(MySQLiteHelper.KEY_NAME)));
TextView itemQuantity = (TextView)view.findViewById(R.id.itemQuantity);
itemQuantity.setText(cursor.getString(cursor.getColumnIndex(MySQLiteHelper.KEY_QUANTITY)));
CheckBox itemCheck = (CheckBox) view.findViewById(R.id.itemCheck);
itemCheck.setChecked(cursor.getInt(cursor.getColumnIndex(MySQLiteHelper.KEY_CHECKED))==1);
return view;
}
}
in your code you have not added your adapter class. I am sure that you will be adding the data in list view from an array list.
So in the time of updating the list view by adding or removing a data to the list view, first either add or remove the data from your array list and the call as follows
listView.invalidateViews();
then call your set Adapter method
I have a ListView with a Custom Adapter, and I need to access the View of individual rows of this ListView. I am trying to do it using getChildAt(), but it is returning null.
Here's my ListView:
myListView = (ListView) findViewById (R.id.listViewLayout);
This is the custom adapter:
public class MyListAdapter extends BaseAdapter {
...
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_row_layout, parent, false);
}
...
}
I create a List, and set it for the ListView:
List <String> myList = new ArrayList<String>();
myList.add("entry 1");
myList.add("entry 2");
myList.add("entry 3");
MyListAdapter myListAdapter = new MyListAdapter(getApplicationContext(), myList);
myListView.setAdapter(myListAdapter);
Now, I want to access the View for individual rows.
View v = myListView.getChildAt(myListView.getFirstVisiblePosition());
This v is null, no matter what. Additionally, myListView.getChildCount() always returns null.
What am I missing? Do I need to add the convertView to parent in getView()? Am I passing wrong parameters to inflate?
I have struggled a lot to figure this out. Please help me!
EDIT: I am posting the MyListAdapter class:
public class MyListAdapter extends BaseAdapter {
private Context context;
private List<String> myList;
public MyListAdapter(Context c, List<String> m) {
context = c;
myList = m;
}
#Override
public int getCount() {
return myList.size();
}
#Override
public Object getItem(int position) {
return myList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final int pos = position;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_row_layout, parent, false);
}
TextView text = (TextView) convertView.findViewById(R.id.itemText);
text.setText(myList.get(pos));
// Set the onClick Listener on this button
Button rowButton = (Button) convertView.findViewById(R.id.itemButton);
//commenting next two lines makes the list row clickable
rowButton.setFocusableInTouchMode(false);
rowButton.setFocusable(false);
rowButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Toast.makeText(context, myList.get(pos), Toast.LENGTH_SHORT).show();
}
});
convertView.setTag(pos);
return convertView;
}
}
In all probability you're doing all of this in onCreate(). Any view-related methods will return null (or empty) because the list has not been rendered yet. What do you need the child view for?
Try instead of extending the BaseAdapter, to use the ArrayAdapter class. With the BaseAdapter, I believe that you have to maintain both the list of objects and the views themselves. So something like this
public class MyAdapter extends ArrayAdapter<String>
{
...
}
Then you would create the class like this.
MyListAdapter myListAdapter = new MyListAdapter(getApplicationContext(), R.layout.list_row_layout, myList);
Updated
Also, in your constructor, you are not calling your base class constructor.