Develop Reference

Spinner default no selection when data fetched from json

Hi I asked this question before.But i didn't got a proper solution. I have a spinner which will load data from json.After selecting any item from spinner then it will post zeroth postition value again to another API.Everyting works fine.But my problem is I want defaultly no slection for spinner.I added a string named "no selection" to to zeroth position but it is not working.Please help me to implement this.
My spinner
void getList(){
final Common common = new Common();
int a= 100;
String webService = "API/Employee/GetList";
String postData = "";
String[] dataColumns = {"ID",//0
"Code",//1
"Name" ,//2
};
Runnable postThread = new Runnable() {
#Override
public void run() {
//Spinner
int a= 0;
ArrayList<String> Names = new ArrayList<String>();
for (int i=0;i<common.dataArrayList.size();i++){
String[] data=new String[3];
data[0]=common.dataArrayList.get(i)[0];
data[1]=common.dataArrayList.get(i)[1];
data[2]=common.dataArrayList.get(i)[2];
List.add(data);
}
for(int i=0;i<List.size();i++){
Names.add(List.get(i)[1]+" - "+List.get(i)[2]);
}
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(Insert.this, R.layout.item_spinner_black, Names);
dataAdapter.setDropDownViewResource(R.layout.item_spinner);
Spinner =(Spinner)findViewById(R.id.spinner);
//I added below code but it not working
// dataAdapter.insert(getString(R.string.selectemp), 0);
Spinner.setAdapter(dataAdapter);
}
My Post Data
postData="{\"Title\":\""+title.getText().toString()
+"\",\"Spinnervalue\":\""+List.get(Spinner.getSelectedItemPosition())[0]}

I think its help you.
ArrayList<String> Names = new ArrayList<String>();
Names.add("no selection");
for (int i=0;i<common.dataArrayList.size();i++){
String[] data=new String[3];
data[0]=common.dataArrayList.get(i)[0];
data[1]=common.dataArrayList.get(i)[1];
data[2]=common.dataArrayList.get(i)[2];
List.add(data);
}
for(int i=0;i<List.size();i++){
Names.add(List.get(i)[1]+" - "+List.get(i)[2]);
}

The problem is the initialization of your adapter. So when you add later the data, it will not have pre-selected item.
Edit:
I reordered your current code.
void getList(){
final Common common = new Common();
int a= 100;
String webService = "API/Employee/GetList";
String postData = "";
String[] dataColumns = {"ID",//0
"Code",//1
"Name" ,//2
};
Runnable postThread = new Runnable() {
#Override
public void run() {
//Spinner
int a= 0;
ArrayList<String> Names = new ArrayList<String>();
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(Insert.this, R.layout.item_spinner_black, Names);
dataAdapter.setDropDownViewResource(R.layout.item_spinner);
Spinner =(Spinner)findViewById(R.id.spinner);
//I added below code but it not working
// dataAdapter.insert(getString(R.string.selectemp), 0);
Spinner.setAdapter(dataAdapter);
for (int i=0;i<common.dataArrayList.size();i++){
String[] data=new String[3];
data[0]=common.dataArrayList.get(i)[0];
data[1]=common.dataArrayList.get(i)[1];
data[2]=common.dataArrayList.get(i)[2];
List.add(data);
}
for(int i=0;i<List.size();i++){
Names.add(List.get(i)[1]+" - "+List.get(i)[2]);
}
}

I added a dummy value.And It worked fine.
ArrayList<String> Names = new ArrayList<String>();
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(Insert.this, R.layout.item_spinner_black, Names);
dataAdapter.setDropDownViewResource(R.layout.item_spinner);
Spinner =(Spinner)findViewById(R.id.spinner);
String[] data = new String[3];
data[0]="00000000-0000-0000-0000-000000000000";
data[1]="Select";
data[2]="Name";
List.add(data);
for (int i=0;i<common.dataArrayList.size();i++){
String[] data=new String[3];
data[0]=common.dataArrayList.get(i)[0];
data[1]=common.dataArrayList.get(i)[1];
data[2]=common.dataArrayList.get(i)[2];
List.add(data);
}
for(int i=0;i<List.size();i++){
Names.add(List.get(i)[1]+" - "+List.get(i)[2]);
}
Spinner.setAdapter(dataAdapter);

Populate Spinner with based on value returned from REST service

I have a REST method that returns result as "Res:"2". Now i need to populate a spinner with values 1,2. If the REST method returns the result as "Res:"3", the spinner values must be 1,2,3.
This is the code that i have implemented. But the spinner shows only 2 for the
Integer[] items = new Integer[]{Integer.valueOf(user2.getString("Res"))};
ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(MainActivity.this, android.R.layout.simple_spinner_item, items);
cboFloorLevel.setAdapter(adapter);
Note: user2 is a JSONObject

try this
List<Integer> numbers = new ArrayList<>();
int item = Integer.valueOf(user2.getString("Res"));
for(int i=1; i<item+1; i++){
numbers.add(i)
}
ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(MainActivity.this,
android.R.layout.simple_spinner_item, numbers);
cboFloorLevel.setAdapter(adapter);

Try this code
int end_value = Integer.valueOf(user2.getString("Res"));
Integer[] items = new Integer[]{end_value};
for(int i=0;i<end_value;i++){
items[i] = i+1;
}
ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(MainActivity.this, android.R.layout.simple_spinner_item, items);
cboFloorLevel.setAdapter(adapter);

I understand from the question that if the json response is
{"Res:"3"} you need to populate the spinner with 1,2,3.
int item = Integer.valueOf(user2.getString("Res"));
ArrayList <Integer>items = new ArrayList<>();
for(int j=1; j < item+1 ; j++){
items.add(j);
}
ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(MainActivity.this,
android.R.layout.simple_spinner_item, items);
cboFloorLevel.setAdapter(adapter);

Found my solution:
You need to import Arrays from java8:
import java.util.Arrays;
and then you can convert string to int, create array and fill that array with lambda passed to Arrays.setAll():
int maxValue = Integer.parseInt(user2.getString("Res"));
int[] items = new int[maxValue];
Arrays.setAll(array, i -> i + 1);
ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(MainActivity.this, android.R.layout.simple_spinner_item, items);
cboFloorLevel.setAdapter(adapter);

Extract substring from a string for spinner entry

I need to extract part of the string and display it in the spinner
I need that when the spinner display data example
For array entries like the following
"Equipo-001"
"Equipo-002"
Should show only:
"001"
"002"
Here's my code
private void rellenarSpinnerConFoliosDeMaquinasDelPunto(List<String> folios) {
maquinas = dbOn.getMaquinasDePunto(idPunto);
for (int i = 0; i < maquinas.size(); i++) {
foliosDeMaquinas.add(maquinas.get(i).getcFolioMaquina());
}
adaptadorFoliosMaquina = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, folios);
adaptadorFoliosMaquina.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spn_folioMaquina.setAdapter(adaptadorFoliosMaquina);
spn_folioMaquina.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

ArrayList<String> numberFolios = new ArrayList<>();
for(int j =0; j < folios.size(); j++){
numberFolios.add(folios.get(j).substring(8, 10));
}
adaptadorFoliosMaquina = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, numberFolios);
Check link for better reference on how to use substring.

You can use SPLIT function
ArrayList<String> data = new ArrayList();
foreach(String get:folios){
data.add(folios.split("-")[1]);
}
adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, data);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);

If your result will be dynamic(The string length would vary in future) the below solution may work,
private void rellenarSpinnerConFoliosDeMaquinasDelPunto(List<String> folios) {
try{
maquinas = dbOn.getMaquinasDePunto(idPunto);
for (int i = 0; i < maquinas.size(); i++) {
foliosDeMaquinas.add(maquinas.get(i).getcFolioMaquina().toString().split("-")[1]);
}
} catch(ArrayIndexOutOfBoundsException e){
e.printStackTrace();
}
adaptadorFoliosMaquina = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, folios);
adaptadorFoliosMaquina.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spn_folioMaquina.setAdapter(adaptadorFoliosMaquina);
spn_folioMaquina.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

Issue with android spinners - Loading distinct values in spinners

I'm using two Spinners to show the items I'm getting from the json response. I have 2 problems right now. When u check my logcat u can see there are items repeating (Right side list, u can see so many pan). I want to have 1 item only once in my Spinner. I want to use something similar to distinct we use in sql databases.
My second problem is,
Select pan in the 1 spinner then 2nd spinner should contain items related to pan. (select pan in 1st spinner and 2nd should display only Pan large, pan medium and personal pan)
#Override
public void onTaskCompleted(JSONArray responseJson) {
try {
List<String> crust = new ArrayList<String>();
List<String> description = new ArrayList<String>();
List<String> extraDescription = new ArrayList<String>();
for (int i = 0; i < responseJson.length(); ++i) {
JSONObject object = responseJson.getJSONObject(i);
if ((object.getString("MainCategoryID")).equals("1")
&& (object.getString("SubCategoryID")).equals("1")) {
JSONArray subMenuArray = object
.getJSONArray("SubMenuEntity");
for (int j = 0; j < subMenuArray.length(); ++j) {
JSONObject subMenuObject = subMenuArray
.getJSONObject(j);
Log.i("Crust", subMenuObject.getString("Crust"));
crust.add(subMenuObject.getString("Crust"));
Log.i("Description",
subMenuObject.getString("Description"));
description.add(subMenuObject.getString("Description"));
JSONArray extraItemEntityArray = subMenuObject
.getJSONArray("ExtraItemEntity");
}
}
crustSP = (Spinner) findViewById(R.id.sp_crust);
ArrayAdapter<String> dataAdapterCru = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, crust);
dataAdapterCru
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
crustSP.setAdapter(dataAdapterCru);
sizeSP = (Spinner) findViewById(R.id.sp_pizza_size);
ArrayAdapter<String> dataAdapterDes = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, description);
dataAdapterDes
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sizeSP.setAdapter(dataAdapterDes);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
Output of this

Call this method to get distinct descriptions and then set the adapter using the return value of this function...
public static ArrayList<String> removeDuplicatesFromList(ArrayList<String> descriptions)
{
ArrayList<String> tempList = new ArrayList<String>();
for(String desc : descriptions)
{
if(!tempList.contains(desc))
{
tempList.add(desc);
}
}
descriptions = tempList;
tempList = null;
return descriptions;
}
For instance
description = Utils.removeDuplicatesFromList(description);
ArrayAdapter<String> dataAdapterDes = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, description);
NOTE:
I would suggest you make a new class call it Utils.java and place the above method inside it and then call it i have mentioned above.
Like this...
import java.util.ArrayList;
public class Utils
{
private Utils()
{
//Its constructor should not exist.Hence this.
}
public static ArrayList<String> removeDuplicatesFromList(ArrayList<String> descriptions)
{
ArrayList<String> tempList = new ArrayList<String>();
for(String desc : descriptions)
{
if(!tempList.contains(desc))
{
tempList.add(desc);
}
}
descriptions = tempList;
tempList = null;
return descriptions;
}
}
I hope it helps.

How do I set the same attributes for multiple AutoCompleteTextViews?

Given that I have the following AutoCompleteTextViews
ArrayAdapter<String> adapter121 = new ArrayAdapter<String>
(this,android.R.layout.simple_dropdown_item_1line,androidBooks);
AutoCompleteTextView acTextView = (AutoCompleteTextView)findViewById(R.id.AndroidBooks);
AutoCompleteTextView acTextView0 = (AutoCompleteTextView)findViewById(R.id.AndroidBooks1);
AutoCompleteTextView acTextView1 = (AutoCompleteTextView)findViewById(R.id.et3);
AutoCompleteTextView acTextView2 = (AutoCompleteTextView)findViewById(R.id.et4);
AutoCompleteTextView acTextView3 = (AutoCompleteTextView)findViewById(R.id.et5);
AutoCompleteTextView acTextView4 = (AutoCompleteTextView)findViewById(R.id.et6);
AutoCompleteTextView acTextView5 = (AutoCompleteTextView)findViewById(R.id.et7);
AutoCompleteTextView acTextView6 = (AutoCompleteTextView)findViewById(R.id.et8);
AutoCompleteTextView acTextView7 = (AutoCompleteTextView)findViewById(R.id.et9);
How would I call:
acTextView.setThreshold(1);
acTextView.setAdapter(adapter121);
on each of my AutoCompleteTextViews?

To set each of the AutoCompleteTextViews you can add them an array mAutoCompleteTextViews and set the attributes by cycling through each one.
ArrayAdapter<String> adapter121 = new ArrayAdapter<String>
(this,android.R.layout.simple_dropdown_item_1line,androidBooks);
AutoCompleteTextView[] mAutoCompleteTextViews = new AutoCompleteTextView[{
(AutoCompleteTextView)findViewById(R.id.AndroidBooks),
(AutoCompleteTextView)findViewById(R.id.AndroidBooks1),
(AutoCompleteTextView)findViewById(R.id.et3),
(AutoCompleteTextView)findViewById(R.id.et4),
(AutoCompleteTextView)findViewById(R.id.et5),
(AutoCompleteTextView)findViewById(R.id.et6),
(AutoCompleteTextView)findViewById(R.id.et7),
(AutoCompleteTextView)findViewById(R.id.et8),
(AutoCompleteTextView)findViewById(R.id.et9)}];
// for each loop to set parameters on each AutoCompleteTextView in mAutoCompleteTextViews
for (AutoCompleteTextView acTextView : mAutoCompleteTextViews ){
acTextView.setThreshold(1);
acTextView.setAdapter(adapter121);
}
If you want to learn about arrays in Java then check out this section from the Java wikibook

You can actually create a loop that does all of this for you
int numberOfViews = 9;
for(int i = 0; i < numberOfViews; i++){
AutoComplete acTextView;
if(i == 0)
acTextView = (AutoCompleteTextView)findViewById(R.id.AndroidBooks);
if(i == 1)
acTextView = (AutoCompleteTextView)findViewById(R.id.AndroidBooks1);
else{
int id = getResources().getIdentifier("et" + (i+1), "id", getPackageName());
acTextView = (AutoCompleteTextView)findViewById(id);
}
acTextView.setThreshold(1);
acTextView.setAdapter(adapter121);
}