Two Spinner and Array - arrays

Question

I'm studing android and the excercise I'll do is this one:
You have the Five Continental with relative state/capital.
Create an Activity with two spinner and une button .
When you select Continent from the first spinner the second spinner should display only the state of the relative continent. When you click on the button a dialog box should show:
Continental: Selected Contiental;
State:Selected State;
StateCapital: the capital of the state.
I don't want to use any db (I'm a dummy at the moment) can you help me ?
I think is more simple to use arrays.
I Create my string xml
<string name="Select_continent">Select Continent</string>
<string-array name="continent">
<item>Usa</item>
<item>Europe</item>
<item>Australia</item>
<item>Asia</item>
<item>Africa</item>
</string-array>
<string name="Select_state_usa">Select State</string>
<string-array name="Usa">
<item>Alabama</item>
<item>Ohio</item>
<item>Florida</item>
<item>...</item>
<string name="Select_state_eu">Select State</string>
<string-array name="Europe">
<item>Germany</item>
<item>Italy</item>
<item>England</item>
<item>...</item>
Then I create my main.xml
<Spinner
android:id="#+id/spinner1"
android:layout_width="300dp"
android:layout_height="50dp"
android:entries="#array/continent"
android:prompt="#string/Select_continent"
android:gravity="center"
/>
<TextView
android:id="#+id/TextView01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=" Select continent:"
android:textColor="#000" />
<Spinner
android:id="#+id/spinner2"
android:layout_width="297dp"
android:layout_height="50dp"
/>
And then I create MyActivity.java
public class MyActivity extends Activity {
private Spinner spinner1, spinner2;
private Button btnSubmit;
final Context context = this;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.Myactivity);
addItemsOnSpinner2();
addListenerOnButton();
addListenerOnSpinnerItemSelection();
}
//add items into spinner dynamically
public void addItemsOnSpinner2() {
spinner2 = (Spinner) findViewById(R.id.spinner2);
List<String> list = new ArrayList<String>();
list.add("Austria");
list.add("Italy");
list.add("Germany");
list.add("France");
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>
this,android.R.layout.simple_spinner_item,list);dataAdapter.setDropDownViewResource
android.R.layout.simple_spinner_dropdown_item);spinner2.setAdapter(dataAdapter);
}
public void addListenerOnSpinnerItemSelection(){
spinner1 = (Spinner) findViewById(R.id.spinner1);
}
//get the selected dropdown list value
public void addListenerOnButton() {
spinner1 = (Spinner) findViewById(R.id.spinner1);
spinner2 = (Spinner) findViewById(R.id.spinner2);
btnSubmit = (Button) findViewById(R.id.btnSubmit);
btnSubmit.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {AlertDialog.Builder alertDialogBuilder3 = new AlertDialog.Builder
(context);
alertDialogBuilder3
.setTitle("Continent")
.setIcon(R.drawable.info)
.setMessage("Continent " + "\n " + String.valueOf (spinner1.getSelectedItem()) +
"\n " + String.valueOf(spinner2.getSelectedItem()) +
"\nCapital : " )
.setNeutralButton("Ok",null)
.create() // create one
.show();
}
});
}}
Can you help me to add the relative state to the continent?

Answer 1

Initialize both spinners, populate the continent spinner and set OnItemSelected() listener, switch-case on the selected item, populate the second spinner according to the case.
EDITED:
Sure! Please note, however that I am currently on my tablet so I will not be able to test out the code before handing it out to you.
public class MyClass extends Activity
{
ArrayList<String> continents;
ArrayList<String> statesOfContA;
ArrayList<String> statesOfContB;
Spinner conts;
Spinner states;
Button btnShowToast;
String continentValue;
String stateValue;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
btnShowToast = (Button)findViewById(R.id.btnShow);
continents = new ArrayList<String>();
statesOfContA = new ArrayList<String>();
statesOfContB = new ArrayList<String>();
continents.add("Continent A");
continents.add("Continent B");
statesOfContA.add("State A");
statesOfContA.add("State B");
statesOfContB.add("State A");
statesOfContB.add("State B");
conts = (Spinner)findViewById(R.id.spConts);
states = (Spinner)findViewById(R.id.spStates);
ArrayAdapter<String> contAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, continents);
conts.setAdapter(contAdapter);
conts.setOnItemClickListener(new OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> parent, View v, int pos,
long arg3)
{
ArrayAdapter<String> stateAdapter;
String choice = parent.getItemAtPosition(pos).toString();
continentValue = continents.getSelectedItem().toString();
switch(choice)
{
case "Continent A":
stateAdapter = new ArrayAdapter<String>(MyClass.this, android.R.layout.simple_spinner_item, statesOfContA);
states.setAdapter(stateAdapter);
break;
case "Continent B":
stateAdapter = new ArrayAdapter<String>(MyClass.this, android.R.layout.simple_spinner_item, statesOfContB);
states.setAdapter(stateAdapter);
break;
}
Toast t = Toast.makeText(getApplicationContext(), "Continent: " + continentValue + " State: " + stateValue, Toast.LENGTH_LONG;
t.show();
}
});
btnShowToast.setOnClickListener(new View.setOnClickListener()
{
#Override
public void onClick(View v)
{
Toast t = Toast.makeText(getApplicationContext(), "Continent: " continentValue + " State: " + stateValue, Toast.LENGTH_LONG;
t.show();
}
}
}
}
Watch out for any spelling mistakes as well! If this doesn't work, kindly let me know so we can find another solution :)
Good luck!