Develop Reference

Create Spinner and Adapter without any XML

I can create a very simple Spinner with code like this
final List<String> categories = new ArrayList<>();
categories.add("First");
categories.add("Second");
categories.add("Third");
final Spinner spinner = new Spinner(context);
final ArrayAdapter<String> dataAdapter = new ArrayAdapter<>(context, R.layout.spinner, categories);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(dataAdapter);
however, this requires R.layout.spinner in my app. How can I avoid this XML with own, pure Java code, e.g. by implementing an own ArrayAdapter-like class?

Extend you custom adapter from ArrayAdapter and try to override getView() with your own code. You should be able to create the adapter with a null resource id. You will have to build you own views since you will no longer be using a resource.

Using listView and spinner in 1 layout

I use listview with cursor adapter and spinner in 1 layout.
I don't know how to use setAdapter into these 2 different thing.
Spinner sp = (Spinner) findViewById(R.id.spinner);
SpinnerAdapter adapter = new SpinnerAdapter(this, R.layout.spinner_layou, R.id.txt, item);
//sp.setAdapter(adapter); <----- I should have to set my spinner adapter here, but it seems to make it crash
cursorAdapter = new NotesCursorAdapter(this, null, 0); //my own class which extend CursorAdapter
ListView list = (ListView) findViewById(android.R.id.list);
list.setAdapter(cursorAdapter);
I have google it and find some clue by using ArrayAdapter. But what i found is ArrayAdapter used for the same type adapter (in my case, I use 2 different adapter(Spinner and CursorAdapter) CMIIW. Is anyone can help me on this?

How to programatically set entries of spinner in android?

I have made various string-arrays in the string.xml file and I have to set different arrays as entries for the spinner according to certain condition in Java. Is it possible or is database the only way to do so. Thanks in advance.

You need to use an adapter and populate with tha array in xml file.
Specify the name of your array in xml at createFromResource method (second parameter).
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.my_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mySpinner.setAdapter(adapter);

You have to extract your data from file:
String[] testArray = getResources().getStringArray(R.array.testArray);
Then, you have to inflate in the spinner:
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, testArray );
mySpinner.setAdapter(spinnerArrayAdapter);

You can start with using ArrayAdapter, it is a simple class to populate spinner items programmatically.
String data[];
//... do your stuff to get populate this array
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, data);
mySpinner.setAdapter(spinnerArrayAdapter);
You can also modify the view of dropdown items and customize them further by overriding this class.

Android ListView setAdapter issue

I'm trying to bind data do a listview on android, but I'm not able to.
I saw some code on the internet and it worked, but I just don't know why, and I don't want to create a new ListView on the fly, I want to use the one that is listed on the main.xml
Why I can do this:
ListView lv = new ListView(this);
lv.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,PEOPLE));
setContentView(lv);
But I can't do this:
ListView listPessoas = (ListView) findViewById(R.id.listPessoas);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.id.listPessoas, PESSOAS);
listPessoas.setAdapter(adapter);

What is R.id.pessoas??
This works fine for me:
String[] x = new String[]{"AAA","BBB","CCC"};
ListView lv = (ListView) findViewById(R.id.listView1);
ArrayAdapter<String> test = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,x);
lv.setAdapter(test);

Your error here is when you are creating the new ArrayAdapter. You are passing R.id.listPessoas as the row view to use for each row. This is the id of the ListView. The adapter is looking for a layout id containing a text view to be used for each row of the list. Change the R.id.listPessoas to android.R.layout.simple_list_item_1 and your code should work. The simple_list_item_1 layout is just a TextView that the data will be bound to.

What you have written is not correct, the second parameter in the array adapter constructor should be the simple layout for each list item not again your list view.
If your have a custom complex layout for your list item you need to write a custom adapter as well.

If you are getting error.
getApplicationContext(); will work instead of 'this'.

Spinner within a tab

i have a problem with the spinner in a tab host:
in fact i successed to make dynamically using
Spinner spinner = new Spinner(isChild() ? getParent() : this);
but i want it defined by the XML file. like this
Spinner spinner = (Spinner) this.findViewById(R.id.widget10);
I got the problem when i use (OnItemSelectedListener())
when opening the the dialogue of selection??
please i need a help,
think u.

Let us suppose, there are two class1 and class2
In class1 define a method
public static View makeSpinner(Context context) {
View v = LayoutInflater.from(context).inflate(R.layout.spinner, null);
Spinner spinner = (Spinner) v.findViewById(R.id.spinner);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(context, android.R.layout.simple_spinner_dropdown_item);
adapter.add("one");
adapter.add("two");
adapter.add("three");
spinner.setAdapter(adapter);
return v;
}
and in the class2 where u need to access the spinner define it's setContentView as below:-
setContentView(MainActivity.makeSpinner(getParent()));

I found a different solution.
My problem was that I had a MapView in the same activity as the spinner. Because of this I couldn't use the described technique.
And actually I didn't wanted to redesign my whole project so I just replaced my spinner in the XML-File with an FrameLayout.
Now my code looks like this:
Spinner spinner = new Spinner(isChild() ? getParent() : this);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getParent(),
android.R.layout.simple_spinner_item, data);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
FrameLayout frame = (FrameLayout)findViewById(R.id.frameLayoutSpinnerTarget);
frame.addView(spinner);