Develop Reference

How to set selected item for Spinner in Android

In an Android app, I have a SpinnerAdapter that I am using to display expiration years of credit cards. My variable expirationYears contains an array of Strings with years from "2020" to "2029". It was declared as String[] expirationYears = new String[10]; and then with a function I set the ten years as Strings, from current year and then the nine subsequent years after that for a total of ten elements in the array. When I run it, this is what I see:
Everything is perfect so far. The only problem is that when as you see in the image above, 2020 is the year selected by default. That is the first element in the expirationYears array. But I want to set 2021 as default (the second element of the array). This is what my code has:
Spinner spinnerYearCreditCardPayment;
SpinnerAdapter creditCardYearAdapter = new SpinnerAdapter(Payment.this, expirationYears);
creditCardYearAdapter
.setDropDownViewResource(android.R.layout.spinner_dropdown_item);
spinnerYearCreditCardPayment.setAdapter(creditCardYearAdapter);
spinnerYearCreditCardPayment
.setOnItemSelectedListener(new OnItemSelectedListener() {
..........
});
I was expecting to have some property available to define which element I want to show by default. Something like creditCardYearAdapter.setSelectedItem(INDEX_NUMBER). But that property does not exist. Do you know how I could set the default selected item so that it is not the first element of the array (2020) but the second (2021)? Thank you.
UPDATE 1:
Following The_Martian's answer, this was what I did:
spinnerYearCreditCardPayment
.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
arg0.setSelection(1);
cardYear = (String) spinnerYearCreditCardPayment
.getSelectedItem();
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
Now I correctly see the second element of the array ("2021") as the default selection.
The problem is that when I use arg0.setSelection(1);, I choose another year and it does not respond. The selected year remains "2021" even thought I am trying to change the year.

You can do similar to the following. I am just giving you an idea here.
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
parent.setSelection(position + 1);
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});

Try this snippet
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id)
{
int seleccion=parent.getSelectedItemPosition();
spinner.setSelection(position)
});
}

You can select the spinner item based on value instead of position. Can refer the example below-
String value = "to be selected value";
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.select_state, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mSpinner.setAdapter(adapter);
if (value != null) {
int spinnerPosition = adapter.getPosition(value);
mSpinner.setSelection(spinnerPosition);
}

Android Multiple Spinner

I'm sure I'm missing something simple, but I am having some logic issues with my code. I am working on a converter app. I will be using two spinners to select between to do conversions. Ex. inches to feet. I am using two simple methods to test before fleshing out all of the code. Right now if I select the value for SpinnerA in the app first, and then select the value for SpinnerB, it doesn't calculate. If I select SpinnerB first and then SpinnerA, it works. What am I missing?
spinnerA = (Spinner)getView().findViewById(R.id.spinnerA);
spinnerB = (Spinner)getView().findViewById(R.id.spinnerB);
adapterA = ArrayAdapter.createFromResource(getContext(),
R.array.conversions, android.R.layout.simple_spinner_item);
adapterA.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapterB = ArrayAdapter.createFromResource(getContext(),
R.array.conversions, android.R.layout.simple_spinner_item);
adapterB.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerA.setAdapter(adapterA);
spinnerB.setAdapter(adapterB);
spinnerA.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
tempA = parent.getItemAtPosition(position).toString();
if (tempA.equals("Inches") && tempB.equals("Centimeters")){
textView.setText(String.valueOf(halfMyNum(100)));
}
else if (tempA.equals("Centimeters")){
if (tempB.equals("Inches")){
textView.setText(String.valueOf(doubleMyNum(12)));
}
}
else{
textView.setText("Please select a valid option");
}
//Toast.makeText(getContext(), parent.getItemAtPosition(position)+ " Selected"
//, Toast.LENGTH_LONG).show();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
spinnerB.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
tempB = parent.getItemAtPosition(position).toString();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}

When you are selecting an item from spinnerA first, tempA is initialized and item listener for spinnerA is called but tempB is not yet initialized.
Then, when you select item from spinnerB, tempB is initialized and item listener for spinnerB is called. In your case, you only called the method in item listener method for spinnerA, so when you select item from spinnerB nothing actually executes. One possible solution is to call the desired method in item listener for spinnerB as well.

Set visibility TableLayout based item selected on Spinner

I want to make Spinner to set Visibility of table, i have 2 Array String "cuboid and cylinder". if i select Cuboid , cubeT table is visible and cyclinderT table is Invisible. and if i select Cylinder , cylinderT table is Visible and cubeT is Invisible.
Sample code welcome. Thank you for your time.

You can set an OnItemSelectedListener to your Spinner then using the int position argument to decide what action to take.
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
switch (position) {
case Cuboid:
cubeT.setVisibility(View.VISIBLE);
cylinderT.setVisibility(View.GONE);
break;
....
}
}
#Override
public void onNothingSelected(AdapterView<?> parentView) { }
});

spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
String text = ((Spinner)spinner).getSelectedItem().toString();
if (Intrinsics.areEqual(text, "Cuboid")) {
//Your code here to set your "table" as cubeT if it's image in imageview
//if it's a "tableLayout" you may create 2 different layouts included and..:
setContentView(R.layout.your_cubeT_layout);
} else if (Intrinsics.areEqual(text, "Cylinder")) {
setContentView(R.layout.your_cyclinderT_layout);
}
} //when it comes to use different layouts on the same activity, generally suggestions made over fragments to make your code more dynamic but i don't know how to do that...
#Override
public void onNothingSelected(AdapterView<?> parentView) {
// your code here
}
});
I'm not using java since years so i might code bad... So no warranty!

how can I start an app with last closed settings?

In my code, there are Spinners for countries and their cities. When I start app, the lists of Spinners are ordering alphabetically.
The application will be opened with the last closed settings. For example:
If we select France for country and Paris for city from spinners.
Then, exit from app. Start again. First element of state_spin will be France, city_spin will be Paris.
how can I do it. thanks..
state_spin = (Spinner) findViewById(R.id.spinner1);
city_spin = (Spinner) findViewById(R.id.spinner2);
new spinner1_countries(context,UrlMain,arrayAdpt_state,state_spin).execute();
//to get state lists from a website
state_spin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
final String[] stateList = spinner1_countries.stateList;
new spinner2_city(context, arrayAdpt_state,city_spin).execute(); //to get city lists
}
public void onNothingSelected(AdapterView<?> arg0) { } });
city_spin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
......

You can store the previously selected options in SharedPreferences. When your app starts again, load these default values from SharedPreferences and set them as default for your selectors.
Find a nice tutorial here

When the User selects something in the spinner, save the position to SharedPreferences:
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
...
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
SharedPreferences.Editor editor = sp.edit();
editor.putInt("1st_spinner", position);
editor.apply();
}
When Your app is started get the position an set the spinner:
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
int position = sp.getInt("1st_spinner", 1);
state_spin.setSelection(position);

Spinner returns null

The countryCodeSpinner shows up as null in following code snippet.
countryCodeSpinner = (Spinner) findViewById(R.id.spinner_country);
countryCodeSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
selectedCountryCode = (Long) selectedItemView.findViewById(R.id.country_name).getTag();
}

Check if you have placed 'setContentView()' method before initializing spinner. Also it can be possible that the resource id is different from which you are using in the same layout file.