Develop Reference

Show only single column name from SQLite db in listview - Android

I need to set only first name field value in the listview.
Am querying data and getting all values and showing them in the listview. need to show only first name
The code,
import c...l.Database.ItemCRUDOperations;
import c...l.Model.Item;
List<Item> items;
ListView listView = (ListView) findViewById(R.id.listView);
itemCrud = new ItemCRUDOperations(this);
itemCrud.open();
items = itemCrud.getAllItems(); // returns id, first name, last name ...
// i need to only show first name in list view, currently it is showing all fields in listview
//I tried items.getFirstName() as I have getters and setters to it but not getting the value.
itemCrud.close();
ArrayAdapter<Item> adapter = new ArrayAdapter<>(this,
android.R.layout.simple_list_item_1, items);
listView.setAdapter(adapter);

Try this code:
...
List<String> firstNames = new ArrayList<>();
for (Item item : items) {
firstNames.add(item.getFirstName);
}
ArrayAdapter<Item> adapter = new ArrayAdapter<>(this,
android.R.layout.simple_list_item_1, firstNames);
listView.setAdapter(adapter);
Or you can simple override toString() method in your Item class:
#Override
public String toString() {
return getFirstName();
}

Use this to get a list with only firstName:
List<String> firstNamelist = new ArrayList<>();
for(Item item : items){
firstnameList.add(item.getFirstName());
}
then pass firstNameList to adapter:
ArrayAdapter<String> adapter = new ArrayAdapter<>(this,
android.R.layout.simple_list_item_1, firstNameList);
Hope it helps.

The easiest option already suggested in another answer is to create list of Strings and pass it to the adapter instead of list of Items.
Another, more general, way is to implement own list adapter, overriding method getView in it, like this:
class ItemListAdapter extends ArrayAdapter<Item> {
private static class ViewHolder {
TextView firstName;
TextView lastName;
// More fields ...
}
ItemListAdapter(Context context, List<Item> items) {
super(context, 0, items);
}
#Override
#NonNull
public View getView(final int position, View view, #NonNull ViewGroup parent) {
final Item item = getItem(position);
final ViewHolder viewHolder;
if (view == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
view = inflater.inflate(R.layout.item_layout, parent, false);
viewHolder.firstName = (TextView) view.findViewById(R.id.first_name_text_view);
view.setTag(viewHolder);
} else {
viewHolder = (ItemListAdapter.ViewHolder) view.getTag();
}
viewHolder.firstName.setText(item.getFirstName());
return view;
}
}
With this approach you will be able to add more information to the list item in future if you need.

How to add multiple items in Listview Android

I'm working on an Android application of booking medicine offline. I have used ListView for Cart, but whenever I add a new item in cart, my previous item get replaced.
L1 = imageacidity
L2 = imagecough
if(msg.toString().equals("L1")) {
adapter = new ContactImageAdapter(this, R.layout.list, imageacidity);
ListView dataList = (ListView) findViewById(R.id.list);
dataList.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
if(msg.toString().equals("L2"))
{
adapter = new ContactImageAdapter(this, R.layout.list, imagecough);
ListView dataList = (ListView) findViewById(R.id.list);
dataList.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
Here I have 5 elements in imageacidity and Imagecough Array. Whenever I select 1 item, it gets added in cart, but when I try to select another item it get replaced with new one.

You have to Add the element inside your adapter.
I will post a custom Adapter and show you how to add elements properly.
Adapter:
public class YourAdapter extends BaseAdapter {
List<String> itens;
private Context mContext;
private static LayoutInflater inflater = null;
public YourAdapter(Context context, List<String> itens){
this.itens = itens;
mContext = context;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return itens.size();
}
public String getItem(int position) {
return itens.get(position);
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.list_row, parent, false);
String msg = itens.get(position);
TextView tx = vi.findViewById(R.id.your_id);
tx.setText(msg);
return vi;
}
public void addItem(String item){
itens.add(item);
}
public void addItens(List<String> itens){
this.itens.addAll(itens);
}
}
ListView:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
adapter = new CustomAdapter(this,yourListOfItens);
listView = (ListView) findViewById(R.id.list_view);
listView.setAdapter(adapter);
}
You can set initial data on constructor of adapter, or use methods addItem and addAll on a click button for example.

The problem you are describing of the data being removed is happening because making a new ContactImageAdapter and calling setAdapter, which will completely remove the data that was already in the ListView.
If you want to properly implement the code in the question, you need something like this.
String msg = ""; // TODO: get this String value
ListView dataList = (ListView) findViewById(R.id.list);
// TODO: Define a single List to store the data and use that in *one* adapter
List<Contact> contacts = new ArrayList<Contact>();
adapter = new ContactImageAdapter(this, R.layout.list, contacts);
dataList.setAdapter(adapter);
// TODO: Replace this with the object to add to the adapter
Contact contact = null;
if(msg.equals("L1")) {
// TODO: Use whatever values you want for "L1"
int img = R.drawable.bati_acidity_1;
String name = "Amlapitta";
String price = "price 170";
contact = new Contact(img, name, price);
}
else if(msg.equals("L2")) {
// TODO: Use whatever values you want for "L2"
int img = R.drawable.bati_acidity_2;
String name = "Amlapitta2";
String price = "price 270";
contact = new Contact(img, name, price);
}
if (contact != null) {
contacts.add(contact);
adapter.notifyDataSetChanged();
}
Another problem is that you are calling notifyDataSetChanged without actually changing the datasets of imageacidity or imagecough.

You can use an algorithm (logic) on the InputListAdapter checking and verifying if there is a MedicineVO (Value Object Pattern) item on old list before the calling notyChange(..) method. In addition, you can wrapping the logic in other class such as MedicineLogic to improve the adapter readability.
See the sample code below:
public class MedicineInputListAdapter extends ArrayAdapter<MedicineVo> {
public static final int[] COLORS = new int[] { Color.WHITE, Color.BLUE };
private Context mContext;
private List<MedicineVo> medicineVos;
private MedicineVo medicineVoActual;
public BasePreOSPreventivaCorretivaInputListAdapter(Context context, int resource, List<MedicineVo> medicineVos) {
super(context, resource, medicineVos);
this.medicineVoActual = new MedicineVo();
this.medicineVos = new ArrayList<MedicineVo>();
this.medicineVos.addAll(medicineVos);
this.mContext = context;
}
private static class ViewHolder {
TextView mMedicineTextView;
//------------------------------------------------------
// others Android view components
//------------------------------------------------------
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder viewHolder;
if (convertView == null) {
//------------------------------------------------------
// mapper from xml to view and add itens to holder
//------------------------------------------------------
//------------------------------------------------------
// add event action to the mMedicineTextView
//------------------------------------------------------
viewHolder.mMedicineTextView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
TextView textView = (TextView) view;
MedicineVo medicineVo = (MedicineVo) textView.getTag();
boolean selected = medicineVo.getSelected();
if (selected) {
/*do it*/
}
refreshPreOSMaterialWhenUpdate(preOSMaterialVo);
}
});
convertView.setTag(viewHolder);
}
else {
viewHolder = (ViewHolder) convertView.getTag();
}
//------------------------------------------------------
// get item and adjust color
//------------------------------------------------------
MedicineVo item = getItem(position);
/*do it*/
return convertView;
}
public void refreshMedicineListWhenUpdate(MedicineVo medicineVo){
List<MedicineVo> newMedicineVos = new ArrayList<MedicineVo>();
for (MedicineVo medicineVoOnList : medicineVos) {
if( StringUtils.isNull(medicineVoOnList.getId()) )
continue;
if( MedicineLogic.existsOnList(medicineVos, medicineVoOnList) )
continue;
/* others checks if necessary */
newMedicineVos.add(medicineVoOnList);
}
medicineVos.addAll(newMedicineVos);
}
}

If you can't select more but only one item of your ListView, this might help.As others have commented on the question, changing the adapter of a ListView can clear the selection too, but as I supposed the code you've posted is inside onCreate (or other kind of initialization) so setting the adapter there won't affect the selection (since there can't be selection without items... :) )

calling remove from custom adapter always removes last item

I have implemented a custom adapter and listItemView. The adapter sets an onlclick listener to a button that is on the listItemView. The onclick listener simply calls a private method I have in the adapter and passes it the position of the item to be removed. I know the position is correct because the database removes the proper item. I have found similar questions but have not been able to adapt the answers to work for me. Ideas and thoughts are greatly appreciated. Thanks.
Here is the full adapter class
public class FoodListAdapter extends ArrayAdapter<FoodListItem> {
//private
private int type;
public FoodListAdapter(Context context, ArrayList<FoodListItem> _objects) {
super(context, 0, _objects);
type = 0;
}
public FoodListAdapter(Context context, ArrayList<FoodListItem> _objects, int _type) {
super(context, 0, _objects);
type = _type;
}
#Override
public View getView(int position, View reusableView, ViewGroup parent)
{
//Cast the reusable view to a listAdpaterItemView
FoodListItemView listItemView = (FoodListItemView) reusableView;
//Check if the listAdapterItem is null
if(listItemView == null)
{
//If it is null, then create a view.
listItemView = FoodListItemView.inflate(parent, this, type);
}
if (type == 2)
{
Button deleteButton = (Button) listItemView.findViewById(R.id.listItemViewDeleteBTN);
deleteButton.setTag(new Integer(position));
}
//Now we need to set the view to display the data.
listItemView.setData(getItem(position));
return listItemView;
}
}
Here is a portion of my code used in fragment. Note that I have a private variable decalred in the class for listAdapter, though I don't think I need that.
private void displayListForDate(Calendar _date)
{
//get the list view
ListView listView = (ListView) getView().findViewById(1);
//Clear the listview by removing the listadapter and setting it to null.
//listView.setAdapter(null);
//First we must get the items.
Global global = (Global) getActivity().getApplicationContext();
DietSQLiteHelper database = global.getDatabase();
//Create a list to hold the items we ate. This list will then be added to the listView.
final ArrayList<FoodListItem> consumedList;
//Add the items to the array.
consumedList = database.getConsumed(_date.getTimeInMillis());
//Create an adapter to be used by the listView
listAdapter = new FoodListAdapter(getActivity().getBaseContext(), consumedList, 2);
//Add the adapter to the listView.
listView.setAdapter(listAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
consumedList.remove(position);
listAdapter.notifyDataSetChanged();
}
});
}

If you didn't implement "equals" method of FoodListItem, try to implements it.

I would suggest,
that you just update the underlying data, in your case its ArrayList<FoodItems>.
In your Adapter make this simple method and change :
private List<FoodListItem> myList = new ArrayList<FoodListItem>();
public FoodListAdapter(Context context, List<FoodListItem> myList) {
super(context, 0, myList);
type = 0;
this.myList = myList;
}
public FoodListAdapter(Context context, List<FoodListItem> myList, int _type) {
super(context, 0, myList);
type = _type;
this.myList = myList;
}
// Also update your getView() method to use myList!
#Override
public View getView(int position, View reusableView, ViewGroup parent)
{
...
listItemView.setData(myList.get(position));
public void removeItem(int positio){
if(myList != null){
myList.remove(position);
}
}
And then in class, you are creating the adapter (Activity/Fragment), just call the method.
// Update the underlying ArrayAdapter
adapter.removeItem(position);
// Notify the adapter, the data has changed
adapter.notifyDataSetChanged();
Also, you shouldnt open connection to your SQLiteDatabase on UI thread, because you are blocking it. You never know, how fast is the reading from disk going to be. If it takes too long, user can think, that your application froze and therefore, he leaves, which you dont want. I would suggest to use AsyncTask, you will find a lot of examples.

I went through and cleaned up my code and it now works, here is the working code. I really don't know exactly the difference other than I updated the IDs that I was using to assign and get views. If anyone can explain the cause for the issue I was having I would appreciate it.
Here is the snippet from my fragment where I create the list view and assign an adapter.
private void displayListForDate(Calendar _date)
{
//get the list view
ListView listView = (ListView) getView().findViewById(R.id.listView);
//Clear the listview by removing the listadapter and setting it to null.
//listView.setAdapter(null);
//First we must get the items.
Global global = (Global) getActivity().getApplicationContext();
DietSQLiteHelper database = global.getDatabase();
//Create a list to hold the items we ate. This list will then be added to the listView.
ArrayList<FoodListItem> consumedList;
//Add the items to the array.
consumedList = database.getConsumed(_date.getTimeInMillis());
//Create an adapter to be used by the listView
listAdapter = new FoodListAdapter(getActivity().getBaseContext(), consumedList, 2);
//Add the adapter to the listView.
listView.setAdapter(listAdapter);
}
and here is my adapter class.
public class FoodListAdapter extends ArrayAdapter<FoodListItem>
{
//private
private int type;
public FoodListAdapter(Context context, ArrayList<FoodListItem> _objects) {
super(context, 0, _objects);
type = 0;
}
public FoodListAdapter(Context context, ArrayList<FoodListItem> _objects, int _type) {
super(context, 0, _objects);
type = _type;
}
#Override
public View getView(int position, View reusableView, ViewGroup parent)
{
//Cast the reusable view to a listAdpaterItemView
FoodListItemView listItemView = (FoodListItemView) reusableView;
//Check if the listAdapterItem is null
if(listItemView == null)
{
//If it is null, then create a view.
listItemView = FoodListItemView.inflate(parent, type);
}
if (type == 2)
{
Button deleteButton = (Button) listItemView.findViewById(R.id.listItemViewDeleteBTN);
deleteButton.setTag(new Integer(position));
deleteButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Integer tag = (Integer) view.getTag();
deleteItem(tag.intValue());
}
});
}
//Now we need to set the view to display the data.
listItemView.setData(getItem(position));
return listItemView;
}
private void deleteItem(int position)
{
FoodListItem item = getItem(position);
Global global = (Global) getContext().getApplicationContext();
DietSQLiteHelper database = global.getDatabase();
database.removeConsumed(item.getID());
remove(getItem(position));
}
}

Possible to inflate android spinner layout extended by ActionBarSherlock?

Is it possible to inflate Textview from #android:id/text1 ?
I don't want to create own layout, I would like just get a little modified text.
Here is my code:
First, I created variable to store data
private List<HashMap<String, String>> dataCities = new ArrayList<HashMap<String, String>>();
//Hashmap with keys and values
//id - 0
//name - default
Second, I created custom adapter in onCreate
#Override
protected void onCreate(Bundle savedInstanceState) {
//...
Spinner citiesSpinner = (Spinner) findViewById(R.id.city_sp);
citiesAdapter = new CustomArrayAdapter(this, R.layout.sherlock_spinner_item, dataCities);
citiesSpinner.setAdapter(citiesAdapter);
}
Third, I created my listener. It works but after calling notifyDataSetChanged nothing happens. Why?
#Override
public void onRequestJsonResponded(RequestType type, JSONArray array) {
//my enum type
switch (type) {
case cities:
//returns hashmap in arraylist, ArrayList<HashMap<String,String>> ...
dataCities = parseJSonArray(array);
Log.d(TAG, "End of parsing");
citiesAdapter.notifyDataSetChanged();
break;
case mark:
//...
break;
case model:
break;
}
}
Here is my custom arrayadapter
private class CustomArrayAdapter extends ArrayAdapter<HashMap<String, String>> {
public CustomArrayAdapter(Context context, int textViewResourceId, List<HashMap<String, String>> objects) {
super(context, textViewResourceId, objects);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater layoutInflater = LayoutInflater.from(getContext());
View v = layoutInflater.inflate(R.layout.sherlock_spinner_item, null);
TextView tv = (TextView)v.findViewById(android.R.id.text1);
tv.setText(getItem(position).get("name"));
return v;
}
}
Could someone tell me why do I get blank spinner data? (Spinner is empty). And how I get modified text without creating new layout? I would like just to use sherlock spinner item layout. Please help.

Simple, the list in your adapter is not the same as the list that you retrieved:
//In here you update your activity's list to the returned values
dataCities = parseJSonArray(array);
Log.d(TAG, "End of parsing");
//But the adapter is using the original value of dataCities (new ArrayList<HashMap<String, String>>() )
citiesAdapter.notifyDataSetChanged();
Since your adapter depends on ArrayAdapter, the easiest solution might be to just create a new adapter when the data is received.

Android add items to arraylist using custom class

I'm trying to add items to an arraylist using this class template:
public class Template {
public String username;
public String email;
}
Here's the whole code:
public void JsonToArrayList(JSONArray myJsonArray) throws JSONException
{
ArrayList<Template> listItems = new ArrayList<Template>();
JSONObject jo = new JSONObject();
Template tem = new Template();
ListView lv = (ListView) findViewById(R.id.listView1);
for(int i = 0; i<myJsonArray.length(); i++)
{
jo = myJsonArray.getJSONObject(i);
tem.username = jo.getString("username");
tem.email = jo.getString("user_email");
listItems.add(tem);
Log.e("Ninja Archives", tem.username);
}
// This is the array adapter, it takes the context of the activity as a first // parameter, the type of list view as a second parameter and your array as a third parameter
ArrayAdapter<Template> arrayAdapter = new ArrayAdapter<Template>(this,android.R.layout.simple_list_item_1, listItems);
lv.setAdapter(arrayAdapter);
}
The problem is, instead of filling my listview with nice username and email strings, it's filling up with items like this:
com.android.ninjaarchives.
Template#40585690
I think somewhere along the line I have become lost, but I've been trying all sorts for ages now and getting nowhere. Can anyone point me in the right direction?
Thanks for any help.
Note: not really sure what's going on with the code; it doesn't appear to be pasting correctly.

Use below code, it can be a solution for you
public void JsonToArrayList(JSONArray myJsonArray) throws JSONException
{
ArrayList<Template> listItems = new ArrayList<Template>();
JSONObject jo = new JSONObject();
Template tem = new Template();
ListView lv = (ListView) findViewById(R.id.listView1);
String listItemString[] = new String[myJsonArray.length];
for(int i = 0; i<myJsonArray.length(); i++)
{
jo = myJsonArray.getJSONObject(i);
tem.username = jo.getString("username");
tem.email = jo.getString("user_email");
listItemString[i] = tem.username +" - " + tem.email; // u can change it according to ur need.
listItems.add(tem);
Log.e("Ninja Archives", tem.username);
}
// This is the array adapter, it takes the context of the activity as a first // parameter, the type of list view as a second parameter and your array as a third parameter
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, listItemString);
lv.setAdapter(arrayAdapter);
}
But better to write Custom adapter by extending BaseAdapter, and do listItem handling in getView method here is one simple tutorial

Take a class extending Base
private class CustomAdapter extends BaseAdapter
{
LayoutInflater inflater;
public CustomAdapter(Context context)
{
inflater = LayoutInflater.from(context);
}
public int getCount()
{
return listItems.size();
}
public Object getItem(int position)
{
return listItems.get(position);
}
public long getItemId(int position)
{
return position;
}
public View getView(final int position, View convertView,ViewGroup parent)
{
//if(convertView==null)
//convertView = inflater.inflate(R.layout.listlayout, parent, false);
Template data = (Template) getItem(position);
TextView v=new TextView(context);
v.setText(data.name);
return v;
}
}
and set adapter to your listview
lv.setAdapter(new CustomAdapter(this));

In this case you have to use a custom adapter (that extends from ArrayAdapter) and override the getView method to display in a custom layout the username and the email.