Develop Reference

How to add a default selected value in android dropdown

I have a dropdown which takes its values from a database, I then want to add a default value to the existing drop down values. In this case the default value would be the selected value.
StringBuilder strbuilder = new StringBuilder();
ArrayList<String> arr_list = new ArrayList<String>();
List<String> m = new ArrayList<String>();
//This get the data values from database
m = db.getData();
int ms = m.size();
String str = strbuilder.toString();
String[] str1 = str.split(",");
try {
if (ms > 1) {
//This is my default value
m.add("Default Value");
for (int i = 0; i < ms; i++) {
m.get(0);
}
} else {
m.get(0);
}
} catch (Exception e) {
e.printStackTrace();
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_dropdown_item, m);
dropdown.setAdapter(adapter);
The codes above is able to add the values from the database to the dropdown and the Default Value is added but it doesn't appear to be the selected value.
For instance if the values from the database are "Apple, Mango,Pineapple" and the default value is "ALL FRUITS".
EXPECTED DROPDOWN
ALL FRUITS
Apple
Mango
Pineapple
Please how can I do make the default value the selected value? Thanks in advance.

I think you need below code.
List<String> categories = new ArrayList<String>();
categories = db.getData();
categories.add(0,"your_default_value");
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(dataAdapter);
spinner.setSelection(0);
Remember when you want to add any value to the very first of Arraylist you just do
arraylist.add(0,"value");
This will add the value to the very first index of arraylist and push all other element down.
In case you need any other element to be selected not first one
Spinner spinner = (Spinner) findViewById(R.id.spinner);
List<String> categories = new ArrayList<String>();
categories.add("Automobile");
categories.add("Business Services");
categories.add("Computers");
categories.add("Education");
categories.add("Personal");
categories.add("Travel");
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(dataAdapter);
int i=categories.indexOf("Education");
spinner.setSelection(i);

If the default value is always going to be at the 0 index, just get a reference to your dropdown/spinner, then set:
spinner.setSelection(0);
And here is a previously answered question detailing how to set it by value, if you'd rather do that.
https://stackoverflow.com/a/4228121/3299157

How to set string from sqlite to Spinner in Android?

I have Spinner in my app and set String[] programmatic.
speciality = (Spinner) findViewById(R.id.general_specality_s);
specialityadapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, speciality_list);
speciality.setAdapter(specialityadapter);
and get selected string like this speciality.getSelectedItem().toString(); and store in sqlite. Now I want to get that value from sqlite and need to set in Spinner1.
String SpinnerText=c.getString(c.getColumnIndex("speciality"));
How to set this string to speciality / Spinner ? Thanks in advance.

Fetch your data into an array and use an array adapter
String[] spinnerArray = your data goes here;
Spinner spinner = (Spinner)findViewById(R.id.yourspinnerid);
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, spinnerArray);
spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(spinnerAdapter);

Spinner not showing dropdown view

I am stuck with this issues.
I am using Spinner for showing different languages.But it is opening as a POP UP and i need to open it as dropdwon.
I don't want to use spinnerMode property of XML.

ArrayList<String> array = new ArrayList<String>();
array.add("None");
array.add("Site Visit");
array.add("Order");
array.add("Meeting");
array.add("Send Quotation");
ArrayAdapter<String> sadapter;
sadapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item,array);
spinRequestAction.setAdapter(sadapter);
This way you can make adapter for your spinner.

Here is a sample code
String[] city_list = new String[3];
city_list[0] = "New York";
city_list[1] = "San Francisco";
city_list[2] = "Washington DC";
ArrayAdapter<String> aa=new ArrayAdapter<String> (getApplicationContext(),        
R.layout.spinner_item, city_list);
city_spinner = (Spinner) findViewById(R.id.spinner1);
city_spinner.setAdapter(aa);
for additional help, you can refer here..

Spinner and HTML select

I have spinner for displaying categories. ((String)categorySpinner.getSelectedItem())) gives the category name.
The spinner is initialized as given below:
List<String> list = new ArrayList<String>();
for (int i = 0; i < category.length; i++) {
list.add(category[i].getName());
}
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(
android.R.layout.simple_spinner_dropdown_item
);
shoppingItemCategorySpnr.setAdapter(dataAdapter);
Is there any idea to make spinner like HTML select-tag so that I can display category name and get category id?

Adapter in Android

I just trying to set value to spinner manually by using ArrayAdapter,
String[] array_string = new String[5];
array_string [0] = "1";
array_string [1] = "2";
array_string [2] = "3";
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, array_spinner);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
when i run this code the first element of the array_string i mean (array_string [0] = "1";) value alone displayed in the Spinner when i click spinner for list of items it raising null pointer exception.

You have two null cells in the array (size = 5, set = 3), change this:
String[] array_string = new String[5];
to
String[] array_string = new String[3];
or assign values to array_string[3] and array_string[4]

Well, there are 2 errors:
(1) your 5th line should probably be:
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, array_string);
...i.e. array_spinner is not an array you declared in your snippet.
(2) You did not initialize all elements of array_string to an actual string immutable value. This means that array_string[3], array_string[4] are null, therefore raising this null pointer error you speak of.