Set Key and Value in Spinner

Best practice to implement key-value pair in android Spinner

setup Spinner:

        spLang = (Spinner)view.findViewById( R.id.spLang );
        spLang.setOnItemSelectedListener( this );
        ArrayList<String> sp_Lang = new ArrayList<String>();
        sp_Lang.add("english");
        sp_Lang.add("french");
        ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,
                    android.R.layout.simple_spinner_item, sp_Lang);
        spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spLang.setAdapter(spinnerAdapter);

For Perticular Spinner item Selection:

int Position = spinnerAdapter.getPosition("Japanese");
spLang.setSelection(Position);

First Create Hashmap for store Key and value pair

HashMap<String ,String> hmLang = new HashMap<String,String>();

Now Add value like this into HashMap :

hmLang.put("english" ,"en");

Here in HashMap key = YourValue and Value = yourKey

@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int position, long id) {
    switch(adapterView.getId())
    {
        case R.id.spLang:
        String lang_Name = adapterView.getItemAtPosition(position).toString();
        String lang_Key = hmLang.get(lang_Name);
        break

    }

If you have any issue with this code then please ask

Set Key and Value in spinner

Try to use HashMap to store Key-Value pair data and in your case spinner item index as key and Province_ID as value. Check below example for more details.

Prepare value for spinner

String[] spinnerArray = new String[Province_ID.size()];
HashMap<Integer,String> spinnerMap = new HashMap<Integer, String>();
for (int i = 0; i < Province_ID.size(); i++)
{
   spinnerMap.put(i,Province_ID.get(i));
   spinnerArray[i] = Province_NAME.get(i);
}

Set value to spinner

ArrayAdapter<String> adapter =new ArrayAdapter<String>(context,android.R.layout.simple_spinner_item, spinnerArray);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);

Get value to spinner

String name = spinner.getSelectedItem().toString();
String id = spinnerMap.get(spinner.getSelectedItemPosition());

spinner key and value

I would go for map instead.

1-create the languages map

Map<String, String> languages = new HashMap<>();
        languages.put("hindi", "hi");
        languages.put("arabic", "ar");
        languages.put("english", "en");

2-get the selected item

    String selectedLanguage = mySpinner.getSelectedItem().toString();
    String languageToSend=languages.get(selectedLanguage); //send it to url

Spinner with Key-Value Pair

Hope this can help you

Add Data in in Spinner

private void setDataInSpinner(Spinner id, int dataArray) {
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this, dataArray, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
        id.setAdapter(adapter);
    }

To get the selected value of Spinner use this

Spinner mySpinner = (Spinner)findViewById(R.id.spinner);
String Text = mySpinner.getSelectedItem().toString();

Or You can use setOnItemSelectedListener to get the selected values

String value = GetClassCode.getCode(Text);//here u have to pass the value that is selected on the spinner

Create a Class

public class GetClassCode {
    static HashMap<String, String> codeHash = new HashMap<String, String>();

    static {
        init();
    }

    public static void init() {
        codeHash.put("key", "value");
        codeHash.put("key", "value");
        codeHash.put("key", "value");
        codeHash.put("key", "value");

    }

    public static String getCode(String param) {
        return codeHash.get(param);
    }
}

What's the correct way to implement key-value pair in Spinner in android

this is one way.
i use it quite a lot though i use my own adapter (inheriting from BaseAdpater).
Another way would b like the above to have an index (0,1,2 etc ) mappd to a value and when you get an item get it's index a well so you can retrieve it's value fro mthe map.
I like that option less...

How to set key value to spinner list from firebase

You're listening one level too high in your JSON tree. Your onDataChange() is now triggered with the CIVIL node, while you likely want it one level lower.

rootRef.child("First/CIVIL").addValueEventListener(

One thing to note though: this will load all data under each date, just to show that date in the spinner. If that is a significant amount of data, you're wasting your user's bandwidth.

I'd consider in that case flattening your data structure and keeping a separate node with just the dates:

"Dates": {
  "CIVIL": {
    "2015-16": true,
    "2016-17": true,
    "2017-18": true
  }
}

The true values are just needed to make sure Firebase doesn't delete the keys. Downloading this branch of the JSON ensures you only download the minimum data that is needed to populate the spinner.

How to Implement Spinner with key-value in Android?

It's using the toString method of HashMap to display the value. So it sees this as one object being in the spinner.

There are two ways to do this:

1. Implement an extension to ArrayAdapter and override the getView() method to return the appropriate value.

2. Implement your own Object to fill the spinner and override its toString method.

The first method has preference, because it allows for much more flexibility.

How to set spinner selection if every field has key and value pair

There is a simply, magic way to display custom object model in spinner

public class TruckCapacity {

        ...

        @Override
        public String toString() {

            return whateverYouWantToDisplay;
        }
    }

And a way to get selected item

TruckCapacity truckCapacity = (TruckCapacity) parent.getItemAtPosition(position);

@Edit

You can for example search your spinners list to find searched id, loop iteration is an equivalent of your array position, and then programitically set selection

public int findSpinnerPosition(List<TruckCapacity> truckCapacityList, int searchId) {

        int position = -1;
        for (int i = 0; i < truckCapacityList.size(); i++) {

            if (truckCapacityList.get(i).getId() == searchId) {

                position = i;
                break;
            }
        }
        return position;
    }

And select

int position = findSpinnerPosition(truckCapacityList, 7);
        if (position != -1) {
            truckCapacitySpinner.setSelection();
        } else {
            //item with this id doesn't exist
        }

Android setting default value from Hashmap Key for Spinner in Simple Adapter

Create a model class for your JSON data,

private class Item {
    String key;
    String value;

    public Item(String key, String value) {
        this.key = key;
        this.value = value;
    }

    public String getKey() {
        return key;
    }

    public void setKey(String key) {
        this.key = key;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    @Override
    public String toString() {
        return value;
    }
}

Parse your data into this model class,

List<Item> list = new ArrayList<>();
Iterator<String> iterator = jsonObject1.keys();
while (iterator.hasNext()) {
    String id = iterator.next();
    String name = jsonObject1.getString(id);
    list.add(new Item(id, name));
}

Initialize the Spinner,

final ArrayAdapter<Item> adapter = new ArrayAdapter<Item>(this, android.R.layout.simple_spinner_dropdown_item, list);
category.setAdapter(adapter);

Find the index of your get_selected_item_id in the list and use setSelection method of Spinner to set it as default.

int index = findIndexOf(list, get_selected_item_id);
if (index != -1) {
    category.setSelection(index);
}

The findIndexOf method,

private int findIndexOf(List<Item> list, int selectedKey) {
    for (int i = 0; i < list.size(); i++) {
        if (list.get(i).getKey().equals(String.valueOf(selectedKey))) {
            return i;
        }
    }
    return -1;
}

The ItemSelectedListener,

category.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int position, long l) {
        // get selected item using position argument
        Item selectedItem = list.get(position);
        // your code
    }

    @Override
    public void onNothingSelected(AdapterView<?> adapterView) {

    }
});

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