如何Toast相关值到从微调器中选择的字符串值。
我能够从下面的 xml 格式中获取微调器数据，但无法将其id 传递给它们以进行 toast 。
**
APIGetCitiesResponse xmlns="http://xxxx">
<APIGetCitiesResult xmlns:a="http://xxxx.xxx" xmlns:i="http://www.w3.org/2010/XMLSchema-instance">
<a:Pair>
<a:FromID>10</a:FromID> <---This should Toast---->
<a:FromName>INDIA</a:FromName><---On selecting this from spinner ------->
<a:ToID>30</a:ToID>
<a:ToName>TURKEY</a:ToName>
</a:Pair>
<a:Pair>
<a:FromID>40</a:FromID>
<a:FromName>USA</a:FromName>
<a:ToID>10</a:ToID>
<a:ToName>INDIA</a:ToName>
</a:Pair>
<a:Pair>
<a:FromID>19</a:FromID>
<a:FromName>CHINA</a:FromName>
<a:ToID>40</a:ToID>
<a:ToName>USA</a:ToName>
</a:Pair>
<a:Pair>
<a:FromID>30</a:FromID>
<a:FromName>TURKEY</a:FromName>
<a:ToID>10</a:ToID>
<a:ToName>INDIA</a:ToName>
</a:Pair>
</Result>
</Response>
**
MainActivity.java
public class MainActivity extends Activity implements AdapterView.OnItemSelectedListener, OnClickListener {
ArrayList<String> title;
ArrayList<String> title2;
Button button;
Spinner spinner;
Spinner spinner2;
private EditText fromDateEtxt;
//private EditText toDateEtxt;
private DatePickerDialog fromDatePickerDialog;
//private DatePickerDialog toDatePickerDialog;
private SimpleDateFormat dateFormatter;
ArrayAdapter<String> from_adapter;
ArrayAdapter<String> from_adapter2;
Map<String, List<String>> values = new HashMap<String, List<String>>();
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
title = new ArrayList<String>();
title2 = new ArrayList<String>();
button = (Button) findViewById(R.id.button1);
spinner = (Spinner) findViewById(R.id.spinner1);
spinner.setOnItemSelectedListener(this);
spinner2 = (Spinner) findViewById(R.id.spinner2);
//spinner2.setOnItemSelectedListener(this);
dateFormatter = new SimpleDateFormat("dd-MM-yyyy", Locale.US);
findViewsById();
setDateTimeField();
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
button.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
parse();
from_adapter=new ArrayAdapter<String>(getBaseContext(),android.R.layout.simple_spinner_item, title);
from_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
title2.clear();
from_adapter2=new ArrayAdapter<String>(getBaseContext(),android.R.layout.simple_spinner_item, title2);
from_adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(from_adapter);
//from_adapter2.clear();
//from_adapter2.notifyDataSetChanged();
spinner2.setAdapter(from_adapter2);
}
private Object from_adapter(int i) {
// TODO Auto-generated method stub
return null;
}
});
}
public void onItemSelected(AdapterView<?> parent, View view, int pos,
long id) {
String lang_Name = parent.getItemAtPosition(pos).toString();
List<String> lang_Key = values.get(lang_Name);
from_adapter2.clear();
for(String s : lang_Key){
from_adapter2.insert(s, from_adapter2.getCount());
}
from_adapter2.notifyDataSetChanged();
Toast.makeText(parent.getContext(), ""+lang_Key,
Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView<?> arg0) {
}
protected void parse() {
// TODO Auto-generated method stub
try {
URL url = new URL(
"www.example.com");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(url.openStream()));
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getElementsByTagName("a:Pair");
for (int i = 0; i < nodeList.getLength(); i++) {
Element el = (Element) nodeList.item(i);
// get the a:W value
String awValue = el.getElementsByTagName("a:FromName").item(0).getTextContent();
// add the above value in our map as key if it isn't present in the map, this key will
// have a list associated with it in which ALL the values for a:R will be stored, if
// the awValue key is present then you just add the new a:R value to its list
if (!values.containsKey(awValue)) {
values.put(awValue, new ArrayList<String>());
}
// also add the value pointed by a:R to the list associated with a:W
String arValue = el.getElementsByTagName("a:ToName").item(0).getTextContent();
values.get(awValue).add(arValue);
// Log.d("ADebugTag", "Value: " + arValue);
}
Log.d("ADebugTag", "Value: " + values);
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
Element fstElmnt = (Element) node;
NodeList nameList = fstElmnt.getElementsByTagName("a:FromName");
Element nameElement = (Element) nameList.item(0);
nameList = nameElement.getChildNodes();
NodeList websiteList = fstElmnt.getElementsByTagName("a:ToName");
Element websiteElement = (Element) websiteList.item(0);
websiteList = websiteElement.getChildNodes();
title.add(((Node) nameList.item(0)).getNodeValue());
}
NodeList nodeList2 = doc.getElementsByTagName("a:Pair");
for (int i = 0; i < nodeList2.getLength(); i++) {
Node node = nodeList2.item(i);
Element fstElmnt = (Element) node;
NodeList nameList = fstElmnt.getElementsByTagName("a:ToName");
Element nameElement = (Element) nameList.item(0);
nameList = nameElement.getChildNodes();
title2.add(((Node) nameList.item(0)).getNodeValue());
}
Set<String> set = new LinkedHashSet<String>(title);
title = new ArrayList<String>(set);
// Collection<String> set = new LinkedHashSet<String>(months);
Set<String> set2 = new LinkedHashSet<String>(title2);
title2 = new ArrayList<String>(set2);
System.out.println("list are");
System.out.println(set);
System.out.println("list 2 are");
System.out.println(set2);
} catch (Exception e) {
System.out.println("XML Pasing Excpetion = " + e);
}
}
@Override
public void onClick(View view) {
if(view == fromDateEtxt) {
fromDatePickerDialog.show();
} else {
Log.d("errorrrr", "soryy");
}
}
}
更新:1
在对上面的代码进行如下更改时，如果 Logcat Log.d("fromid fromid", "fromid: "+ fromid) 中的第一个微调器，我将获得所有 ID；但是如何将它附加到微调器，以便如果单击特定值，则其特定 id 为 Toasted。
NodeList nodeList = doc.getElementsByTagName("Pair");
for (int i = 0; i < nodeList.getLength(); i++) {
Element el = (Element) nodeList.item(i);
String awValue = el.getElementsByTagName("FromName").item(0).getTextContent();
if (!values.containsKey(awValue)) {
values.put(awValue, new ArrayList<String>());
String fromid = el.getElementsByTagName("FromID").item(0).getTextContent();
Log.d("fromid fromid", "fromid: " + fromid);
}
String arValue = el.getElementsByTagName("ToName").item(0).getTextContent();
values.get(awValue).add(arValue);
}
最佳答案
为 xml 响应城市创建一个 POJO 类。
City.java
public class City {
int id;
String name;
public City() {
}
public City(int id, String name) {
this.id = id;
this.name = name;
}
//getters ad setters
}
与其每次都解析 xml，不如在一个循环中解析所有内容。
解析方法
Map<Integer, City> to = new HashMap<>();
Map<Integer, City> from = new HashMap<>();
protected void parse() {
try {
URL url = new URL("https://raw.githubusercontent.com/kushagrakhare/g/master/test.xml");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(url.openStream()));
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getElementsByTagName("a:CityPair");
for (int i = 0; i < nodeList.getLength(); i++) {
Element el = (Element) nodeList.item(i);
// get the a:W value
String fromCityName = el.getElementsByTagName("a:FromCityName").item(0).getTextContent();
int fromCityID = Integer.parseInt(el.getElementsByTagName("a:FromCityID").item(0).getTextContent());
int toCityID = Integer.parseInt(el.getElementsByTagName("a:ToCityID").item(0).getTextContent());
String toCityName = el.getElementsByTagName("a:ToCityName").item(0).getTextContent();
City from1 = new City(fromCityID, fromCityName);
City to1 = new City(toCityID, toCityName);
from.put(fromCityID, from1);
to.put(toCityID, to1);
}
for (City item : from.values()) {
title.add(item.getName());
}
for (City item : to.values()) {
title2.add(item.getName());
}
} catch (Exception e) {
System.out.println("XML Pasing Excpetion = " + e);
}
}
存储每个微调器的选择，并在它更改时显示 toast 。
onItemSelected代码
int spinner1SelectionPos;
int spinner2SelectionPos;
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
switch (parent.getId()) {
case R.id.spinner1:
spinner1SelectionPos = pos;
break;
case R.id.spinner2:
spinner2SelectionPos = pos;
break;
}
int fcityKey = getMapKey(from, title.get(spinner1SelectionPos));
int tcityKey = getMapKey(to, title2.get(spinner2SelectionPos));
String message = title.get(spinner1SelectionPos) + " " + fcityKey
+ " " + title2.get(spinner2SelectionPos) + " " + tcityKey;
Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
}
//for getting key from a map using value
private int getMapKey(Map<Integer, City> map, String value) {
for (Map.Entry<Integer, City> item : map.entrySet()) {
if (item.getValue().getName().equals(value)) return item.getKey();
}
return -1;
}
关于java - 如何在从 xml 解析中选择的微调器上显示/烘烤字符串数组的相关项，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36807013/