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我在我的家庭活動中有3個微調。如果我選擇1個其他應該根據第一個微調改變。我有國家，城市和位置作爲微調，如果我選擇國家，那麼城市和位置應該改變根據那。現在我設法得到微調（從數據庫中的項目）的國家項目。現在如何獲得微調選項中的項目..迷惑。 這裏是我的家活動（其中我得到微調（國家）項）：如何獲得微調項目的選擇先前的微調在Android？
public class Home extends AppCompatActivity implements AdapterView.OnItemClickListener, AdapterView.OnItemSelectedListener {
private Spinner countrySpinner, locationSpinner, citySpinner;
private TextView cityCodeTextView;
private Button submitButton;
private ArrayList<String> country_list, location_list, city_list;
private JSONArray result;
ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
countrySpinner = (Spinner) findViewById(Country);
//citySpinner = (Spinner) findViewById(City);
//locationSpinner = (Spinner) findViewById(R.id.Location);
countrySpinner .setOnItemSelectedListener(this);
country_list = new ArrayList<String>();
//location_list = new ArrayList<String>();
// city_list = new ArrayList<String>();
getData();
}
private void getData(){
StringRequest
stringRequest = new StringRequest(Config.DATA_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
JSONObject j = null;
try {
Log.d("Test",response);
JSONArray result = new JSONArray(response);
//Calling method getCountry to get the Country from the JSON Array
getCountry(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}});
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
private void getCountry(JSONArray jsonArrayCountry){
//Traversing through all the items in the json array
List<Country> countries = new ArrayList<>();
try {
String country_name, country_code;
JSONObject countries_object;
for (int i = 0; i < jsonArrayCountry.length(); i++) {
countries_object = jsonArrayCountry.getJSONObject(i);
country_code = countries_object.getString("id");
country_name = countries_object.getString("country");
countries.add(new Country(country_code, country_name));
}
ArrayAdapter countryAdapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, countries);
countrySpinner.setPrompt("--Select Country--");
countrySpinner.setAdapter(countryAdapter);
countrySpinner.setAdapter(new NothingSelectedSpinnerAdapter(countryAdapter,
R.layout.contact_spinner_row_nothing_selected,this));
countrySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
} catch (JSONException e) {
Log.e("Home", e.getLocalizedMessage(), e);
}
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
//Setting the values to textviews for a selected item
//textViewName.setText(getName(position));
//textViewCourse.setText(getCourse(position));
//textViewSession.setText(getSession(position));
}
//When no item is selected this method would execute
@Override
public void onNothingSelected(AdapterView<?> parent) {
// textViewName.setText("");
// textViewCourse.setText("");
//textViewSession.setText("");
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
}
這是Country.java
public class Country {
private String name;
private String id;
public Country(String id, String name) {
this.name = name;
this.id = id;
}
public String getName() {
return name;
}
public String getId() {
return id;
}
@Override
public String toString() {
return name;
}
}
這是City.java
public class City {
private String name;
public String getName() {
return name;
}
@Override
public String toString() {
return name;
}
}
這是Location.java
public class Location {
private String name;
public String getName() {
return name;
}
@Override
public String toString() {
return name;
}
}
這是Config.java
public class Config {
//JSON URL
public static final String DATA_URL = "http://demo5...../get_country.php";
public static final String DATA_URL1 = "http://demo5...../get_jsoncity.php?id=";
//Tags used in the JSON String
public static final String DATA_URL2 = "http://demo5...../get_jsonlocation.php?id=";
//Tags used in the JSON String
//JSON array name
public static final String JSON_ARRAY = "result";
}
這是我第一次微調JSON：
[
{
"id": "1",
"country": "UAE"
},
{
"id": "2",
"country": "UK"
},
{
"id": "3",
"country": "SAUDI ARABIA"
},
{
"id": "4",
"country": "OMAN"
},
{
"id": "5",
"country": "BAHRAIN"
},
{
"id": "6",
"country": "INDIA"
}
]
這是對城市，如果我選擇的ID = 1
[
{
"id": "1",
"city_name": "Abu Dhabi"
},
{
"id": "2",
"city_name": "Dubai"
},
{
"id": "3",
"city_name": "Sharjah"
},
{
"id": "4",
"city_name": "Ajman"
},
{
"id": "5",
"city_name": "Ummal Qwain"
}
]
我已經得到第一個微調項目即國家，我需要根據第一個微調選項獲得城市（第二微調）和位置（第三微調）的項目。
見本教程; http://www.androidhive.info/2013/12/android-populating-spinner-data-from-mysql-database/ – rafsanahmad007
是的，我看到了，但我需要3微調..thts 1 –
，如果我選擇其他1 2 shud從服務器n得到所選項目不是所有項目 –