我在Web服务中添加微调器值。我想要的是在edittext中添加一个提示，例如＆＃34;选择你的国家＆＃34;。我尝试使用自定义适配器，但它没有成功。有什么好办法吗？
public class MainActivity extends AppCompatActivity {
private EditText card_number_et, cvv_et, card_holder_name_et, multiline_et, postcode_et;
private Spinner country_spin, state_spin, city_spin;
private Button pay_btn;
static EditText expiry_date_et;
private ArrayAdapter adapter, adapter1, adapter2, adapter3;
private ArrayList<String> namelist = new ArrayList<>();
private ArrayList<String> idlist = new ArrayList<>();
private HashMap<String,String> spinnerMap1, spinnerMap2, spinnerMap3;
private String countryid, stateid, cityid;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
country_spin = (Spinner)findViewById(R.id.country_spin);
state_spin = (Spinner)findViewById(R.id.state_spin);
city_spin = (Spinner)findViewById(R.id.city_spin);
card_number_et = (EditText)findViewById(R.id.card_number_et);
expiry_date_et = (EditText)findViewById(R.id.expiry_date_et);
cvv_et = (EditText)findViewById(R.id.cvv_et);
card_holder_name_et = (EditText)findViewById(R.id.card_holder_name_et);
multiline_et = (EditText)findViewById(R.id.multiline_et);
postcode_et = (EditText)findViewById(R.id.postcode_et);
pay_btn = (Button)findViewById(R.id.pay_btn);
expiry_date_et.setOnClickListener(new View.OnClickListener() {
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public void onClick(View v) {
DatePickerFragment date = new DatePickerFragment();
date.show(getFragmentManager(), "Date");
}
});
country_spin.setPrompt("Select your country");
state_spin.setPrompt("Select your state");
city_spin.setPrompt("Select your city");
getCountryList();
country_spin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String countryname = country_spin.getSelectedItem().toString();
System.out.println("somucountryname"+" "+countryname);
countryid = spinnerMap1.get(countryname);
System.out.println("somucountrynameid"+" "+countryid);
if(countryid != null && !countryid.trim().isEmpty()){
getStateList(countryid);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
state_spin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String statename = state_spin.getSelectedItem().toString();
System.out.println("somustatename"+" "+statename);
stateid = spinnerMap2.get(statename);
System.out.println("somustateid"+" "+stateid);
if(stateid != null && !stateid.trim().isEmpty()){
getCityList(stateid);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
pay_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
makepayment();
}
});
} // onCreate ends
private void getCountryList() {
if(namelist!=null )namelist.clear();
if(idlist!=null )idlist.clear();
StringRequest stringRequest = new StringRequest(Request.Method.GET, "http://www.example.com/webservice/allreligionlisting",
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jObj = new JSONObject(response);
JSONArray jArray = jObj.getJSONArray("all_country");
for(int i=0;i<jArray.length();i++){
JSONObject main = jArray.getJSONObject(i);
namelist.add(main.getString("name"));
idlist.add(main.getString("code"));
String[] spinnerArray = new String[idlist.size()];
spinnerMap1 = new HashMap<>();
for (int j = 0; j < idlist.size(); j++)
{
spinnerMap1.put(namelist.get(j),idlist.get(j));
spinnerArray[j] = namelist.get(j);
}
adapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_spinner_item, spinnerArray);
adapter.setDropDownViewResource(R.layout.spinnerlayout);
country_spin.setAdapter(adapter);
}
} catch (JSONException e) {
// JSON error
e.printStackTrace();
Toast.makeText(MainActivity.this, "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, "VolleyError" + error.toString(), Toast.LENGTH_LONG).show();
}
}) {
/*@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
return params;
}*/
};
RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
requestQueue.add(stringRequest);
}
private void getStateList(final String countryId) {
if(namelist!=null )namelist.clear();
if(idlist!=null )idlist.clear();
StringRequest stringRequest = new StringRequest(Request.Method.GET, "http://www.example.com/webservice/allstate/"+countryId,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jObj = new JSONObject(response);
if(jObj.getString("ACK").equals("1")){
JSONArray jArray = jObj.getJSONArray("all_state");
for(int i=0;i<jArray.length();i++){
JSONObject main = jArray.getJSONObject(i);
namelist.add(main.getString("name"));
idlist.add(main.getString("id"));
String[] spinnerArray = new String[idlist.size()];
spinnerMap2 = new HashMap<>();
for (int j = 0; j < idlist.size(); j++)
{
spinnerMap2.put(namelist.get(j),idlist.get(j));
spinnerArray[j] = namelist.get(j);
}
adapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_spinner_item, spinnerArray);
adapter.setDropDownViewResource(R.layout.spinnerlayout);
state_spin.setAdapter(adapter);
}
}
} catch (JSONException e) {
// JSON error
e.printStackTrace();
Toast.makeText(MainActivity.this, "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, "VolleyError" + error.toString(), Toast.LENGTH_LONG).show();
}
}) {
/*@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
return params;
}*/
};
RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
requestQueue.add(stringRequest);
}
private void getCityList(final String stateId) {
if(namelist!=null )namelist.clear();
if(idlist!=null )idlist.clear();
StringRequest stringRequest = new StringRequest(Request.Method.GET, "http://www.example.com/webservice/allcity/"+stateId,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jObj = new JSONObject(response);
if(jObj.getString("ACK").equals("1")){
JSONArray jArray = jObj.getJSONArray("all_city");
for(int i=0;i<jArray.length();i++){
JSONObject main = jArray.getJSONObject(i);
namelist.add(main.getString("name"));
idlist.add(main.getString("id"));
String[] spinnerArray = new String[idlist.size()];
spinnerMap3 = new HashMap<>();
for (int j = 0; j < idlist.size(); j++)
{
spinnerMap3.put(namelist.get(j),idlist.get(j));
spinnerArray[j] = namelist.get(j);
}
adapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_spinner_item, spinnerArray);
adapter.setDropDownViewResource(R.layout.spinnerlayout);
city_spin.setAdapter(adapter);
}
}
} catch (JSONException e) {
// JSON error
e.printStackTrace();
Toast.makeText(MainActivity.this, "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, "VolleyError" + error.toString(), Toast.LENGTH_LONG).show();
}
}) {
/*@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
return params;
}*/
};
RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
requestQueue.add(stringRequest);
}
}
答案 0 :(得分：0)
我最近在我的项目中实现了这一点。在填写SELECT LEFT(s.artikkelId, 2) as lev_id, *,
SUM(s.pris*s.antall) AS total, SUM(s.antall) AS antall
FROM ecs_statistikk s JOIN
butikk_ordre bo
ON s.ordreId = bo.ecs_ordre_id AND
s.butikkNr = bo.site_id
WHERE s.salgsDato >= '2016-06-01' AND s.salgsDato <= '2016-09-30'
GROUP BY LEFT(s.artikkelId, 2)
ORDER BY total DESC ;
通行证＆＃34; 选择项目＆＃34;之前，您需要做的就是在arraylist的 0 arraylist，然后用数据填充它。然后在你的Spinner适配器中覆盖以下方法 -
position您可以看到示例here。