我有一个活动，我必须解析XML并使用解析的数据填充Spinner。
我完成了解析XML。这是方法：
void parse_ExamList()
{
ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
//String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xmlContent); // getting DOM element
//count_questions=2;
NodeList nl = doc.getElementsByTagName(KEY_EXAMSET);
// looping through all item nodes <item>
for ( int i = 0; i < nl.getLength();i++) {
// while(counter< nl.getLength())
// {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
//map.put(KEY_EXAMSET, parser.getValue(e, KEY_EXAMSET));
map.put(KEY_SETID, parser.getValue(e, KEY_SETID));
map.put(KEY_SETNAME, parser.getValue(e, KEY_SETNAME));
//Log.i("Set ID: ", parser.getValue(e, KEY_SETID));
//Log.i("Set Name: ", parser.getValue(e, KEY_SETNAME));
menuItems.add(map);
}
}
如果你发现你可以看到arraylist的 KEY_SETID 和 KEY_SETNAME 。我必须使用 KEY_SETNAME 填充微调器，并且微调器中不会显示 KEY_SETID 。但是，如果单击该项，则应获取与该名称对应的id，以便发送到服务器。
我有一个填充微调器的方法，如下所示：
// add items into exam list spinner dynamically
public void addItemsOnExamListSpinner()
{
List<String> list = new ArrayList<String>();
list.add("Speed Test 150(min) PO Set-01");
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
exam_list_spinner.setAdapter(dataAdapter);
}
我应该如何使用解析XML时获得的ArrayList填充微调器？
这是完整活动：
public class SpeedTestExamNameActivity extends Activity {
Spinner exam_list_spinner;
Button detailsBtn;
TextView showUser;
String full_name;
//variables to get response from server
String responseBody;
//variables required for parsing the XML
String xmlContent=null;
// XML node keys
static final String KEY_EXAMSET = "ExamSet"; // parent node
static final String KEY_SETID = "SetId";
static final String KEY_SETNAME = "SetName";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_speed_test_exam_name);
//checking internet connectivity to download list
isOnline_downloadList();
//Showing user full name after login
full_name=getFromPreference("user_name");
//textview to show user name
showUser=(TextView)findViewById(R.id.speed_username_textView);
showUser.setText("Welcome, "+full_name);
//spinner
exam_list_spinner = (Spinner) findViewById(R.id.speed_examlist_spinner);
//adding items to spinners
addItemsOnExamListSpinner();
// onclick details button
detailsBtn = (Button) findViewById(R.id.speed_exam_details_button);
detailsBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(SpeedTestExamNameActivity.this,
"Exam List Spinner: "+ String.valueOf(exam_list_spinner.getSelectedItem()),
Toast.LENGTH_SHORT).show();
Intent intent = new Intent(SpeedTestExamNameActivity.this, SpeedTestActivity.class);
SpeedTestExamNameActivity.this.startActivity(intent);
}
});
}
//getting content from preferences
public String getFromPreference(String variable_name)
{
String preference_return;
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
preference_return = preferences.getString(variable_name,"");
return preference_return;
}
//check connection
public boolean isOnline_downloadList() {
ConnectivityManager cm =(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
//sending request for login
new MyAsyncTask().execute(getFromPreference("student_code"));
return true;
}
//alert box to show internet connection error
AlertDialog.Builder Internet_Alert = new AlertDialog.Builder(SpeedTestExamNameActivity.this);
// set title
Internet_Alert.setCancelable(false);
Internet_Alert.setTitle("Attention!");
Internet_Alert.setMessage("This application requires internet connectivity, no internet connection detected");
Internet_Alert.setPositiveButton("Quit", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1)
{
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
onQuitPressed();
}
});
Internet_Alert.create().show();
return false;
}
//to remove application from task manager
public void onQuitPressed() {
int pid = android.os.Process.myPid();
android.os.Process.killProcess(pid);
}
//===================================================================================================================================
//sending student code to server to get exam list
//===================================================================================================================================
private class MyAsyncTask extends AsyncTask<String, Integer, Double>{
@Override
protected Double doInBackground(String... params) {
// TODO Auto-generated method stub
postData(params[0]);
return null;
}
protected void onPostExecute(Double result){
//Toast.makeText(getApplicationContext(), responseBody, Toast.LENGTH_LONG).show();
//Log.i("response: ", responseBody);
//processResponce(responseBody);
//going to next activity
xmlContent=responseBody;
parse_ExamList();
}
protected void onProgressUpdate(Integer... progress){
}
public void postData(String student_code) {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
//HttpPost httppost = new HttpPost("http://icaerp.com/AndroidDataService/dataServiceAndroid.asmx/login");
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(SpeedTestExamNameActivity.this);
final String url_first = preferences.getString("URLFirstPart","");
HttpPost httppost = new HttpPost(url_first+"ExamList");
try {
// Data that I am sending
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("StudentCode", student_code));
//nameValuePairs.add(new BasicNameValuePair("Password", passwrd));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
responseBody = EntityUtils.toString(response.getEntity());
Log.d("result", responseBody);
}
catch (Throwable t ) {
//Toast.makeText( getApplicationContext(),""+t,Toast.LENGTH_LONG).show();
Log.d("Error Time of Login",t+"");
}
}
}
//===================================================================================================================================
//END sending EmailAddress and Password to server
//===================================================================================================================================
// function to populate SPINNER with exam list from xml
void parse_ExamList()
{
ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
//String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xmlContent); // getting DOM element
//count_questions=2;
NodeList nl = doc.getElementsByTagName(KEY_EXAMSET);
// looping through all item nodes <item>
for ( int i = 0; i < nl.getLength();i++) {
// while(counter< nl.getLength())
// {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
//map.put(KEY_EXAMSET, parser.getValue(e, KEY_EXAMSET));
map.put(KEY_SETID, parser.getValue(e, KEY_SETID));
map.put(KEY_SETNAME, parser.getValue(e, KEY_SETNAME));
//Log.i("Set ID: ", parser.getValue(e, KEY_SETID));
//Log.i("Set Name: ", parser.getValue(e, KEY_SETNAME));
menuItems.add(map);
}
}
// add items into exam list spinner dynamically
public void addItemsOnExamListSpinner()
{
List<String> list = new ArrayList<String>();
list.add("Speed Test 150(min) PO Set-01");
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
exam_list_spinner.setAdapter(dataAdapter);
}
}
这是布局文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".SpeedTestExamNameActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:text="@string/speed_choose_exam"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Spinner
android:id="@+id/speed_examlist_spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="68dp" />
<Button
android:id="@+id/speed_exam_details_button"
android:layout_width="95dp"
android:layout_height="wrap_content"
android:layout_below="@+id/speed_examlist_spinner"
android:layout_centerHorizontal="true"
android:layout_marginTop="36dp"
android:text="@string/details" />
<TextView
android:id="@+id/speed_username_textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Name Title"
android:textAppearance="?android:attr/textAppearanceSmall" />
</RelativeLayout>
如何从XML解析方法返回的Arraylist中填充Spinner？
答案 0 :(得分：5)
这就是你可以这样做的方法。
首先，创建一个POJO MyObject，其中包含2个字段 KEY_SETID 和 KEY_SETNAME 及其相关的getter/setter。覆盖toString()，以返回KEY_SETNAME，因为您希望将其显示为Spinner中的项目名称。
然后，通过解析XML，从您填充的ArrayList创建MyObject HashMap。
然后使用下面的示例代码段填充Spinner。
Spinner s = (Spinner) findViewById(R.id.SpinnerSpcial);
ArrayList<MyObject> objects = new ArrayList<MyObject>(); // This is actually the list created from the HashMap
ArrayAdapter<MyObject> adapter = new ArrayAdapter<ObjectName>(this, android.R.layout.simple_spinner_item, objects);
s.setAdapter(adapter);
现在要选择项目，请使用以下代码。
MyObject selectedItem = (MyObject) s.getSelectedItem(); // Object which was selected.
selectedItem.getKEY_SETID(); // This will give you the ID of the item selected. Do whatever you wish with to do.
尝试一下，让我知道，如果你被困在任何地方。
<强>更新： -
你的POJO会是这样的。
public class MyObject {
private String KEY_SETID;
private String KEY_SETNAME;
public String getKEY_SETID() {
return KEY_SETID;
}
public void setKEY_SETID(String kEY_SETID) {
KEY_SETID = kEY_SETID;
}
public String getKEY_SETNAME() {
return KEY_SETNAME;
}
public void setKEY_SETNAME(String kEY_SETNAME) {
KEY_SETNAME = kEY_SETNAME;
}
@Override
public String toString() {
return this.KEY_SETNAME; // Value to be displayed in the Spinner
}
}
答案 1 :(得分：2)
提示：尝试使代码变得简单和有效。首先，在您的解析函数中，而不是向HashMap添加ArrayList ..取两个arraylists和这些ArrayList s应该在类级别声明。相应地，填写ArrayList个并在Spinner点击时获取它们。所以Activity代码代表：
public class SpeedTestExamNameActivity extends Activity {
Spinner exam_list_spinner;
Button detailsBtn;
TextView showUser;
String full_name;
ArrayList<String> menuItems = new ArrayList<String>();
ArrayList<String> menuKeys = new ArrayList<String>();
//variables to get response from server
String responseBody;
//variables required for parsing the XML
String xmlContent=null;
// XML node keys
static final String KEY_EXAMSET = "ExamSet"; // parent node
static final String KEY_SETID = "SetId";
static final String KEY_SETNAME = "SetName";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_speed_test_exam_name);
//checking internet connectivity to download list
isOnline_downloadList();
//Showing user full name after login
full_name=getFromPreference("user_name");
//textview to show user name
showUser=(TextView)findViewById(R.id.speed_username_textView);
showUser.setText("Welcome, "+full_name);
//spinner
exam_list_spinner = (Spinner) findViewById(R.id.speed_examlist_spinner);
//adding items to spinners
addItemsOnExamListSpinner();
// onclick details button
detailsBtn = (Button) findViewById(R.id.speed_exam_details_button);
detailsBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(SpeedTestExamNameActivity.this,
"Exam List Spinner: "+
String.valueOf(exam_list_spinner.getSelectedItem()),
Toast.LENGTH_SHORT).show();
//here you get the menuKey too
Toast.makeText(SpeedTestExamNameActivity.this,
"Exam List Spinner Key: "+ menuKeys.get(exam_list_spinner.getSelectedItemPosition()),
Toast.LENGTH_SHORT).show();
Intent intent = new Intent(SpeedTestExamNameActivity.this, SpeedTestActivity.class);
SpeedTestExamNameActivity.this.startActivity(intent);
}
});
}
//getting content from preferences
public String getFromPreference(String variable_name)
{
String preference_return;
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
preference_return = preferences.getString(variable_name,"");
return preference_return;
}
//check connection
public boolean isOnline_downloadList() {
ConnectivityManager cm =(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
//sending request for login
new MyAsyncTask().execute(getFromPreference("student_code"));
return true;
}
//alert box to show internet connection error
AlertDialog.Builder Internet_Alert = new AlertDialog.Builder(SpeedTestExamNameActivity.this);
// set title
Internet_Alert.setCancelable(false);
Internet_Alert.setTitle("Attention!");
Internet_Alert.setMessage("This application requires internet connectivity, no internet connection detected");
Internet_Alert.setPositiveButton("Quit", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1)
{
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
onQuitPressed();
}
});
Internet_Alert.create().show();
return false;
}
//to remove application from task manager
public void onQuitPressed() {
int pid = android.os.Process.myPid();
android.os.Process.killProcess(pid);
}
//===================================================================================================================================
//sending student code to server to get exam list
//===================================================================================================================================
private class MyAsyncTask extends AsyncTask<String, Integer, Double>{
@Override
protected Double doInBackground(String... params) {
// TODO Auto-generated method stub
postData(params[0]);
return null;
}
protected void onPostExecute(Double result){
//Toast.makeText(getApplicationContext(), responseBody, Toast.LENGTH_LONG).show();
//Log.i("response: ", responseBody);
//processResponce(responseBody);
//going to next activity
xmlContent=responseBody;
parse_ExamList();
}
protected void onProgressUpdate(Integer... progress){
}
public void postData(String student_code) {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
//HttpPost httppost = new HttpPost("http://icaerp.com/AndroidDataService/dataServiceAndroid.asmx/login");
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(SpeedTestExamNameActivity.this);
final String url_first = preferences.getString("URLFirstPart","");
HttpPost httppost = new HttpPost(url_first+"ExamList");
try {
// Data that I am sending
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("StudentCode", student_code));
//nameValuePairs.add(new BasicNameValuePair("Password", passwrd));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
responseBody = EntityUtils.toString(response.getEntity());
Log.d("result", responseBody);
}
catch (Throwable t ) {
//Toast.makeText( getApplicationContext(),""+t,Toast.LENGTH_LONG).show();
Log.d("Error Time of Login",t+"");
}
}
}
//===================================================================================================================================
//END sending EmailAddress and Password to server
//===================================================================================================================================
// function to populate SPINNER with exam list from xml
void parse_ExamList()
{
XMLParser parser = new XMLParser();
//String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xmlContent); // getting DOM element
//count_questions=2;
NodeList nl = doc.getElementsByTagName(KEY_EXAMSET);
// looping through all item nodes <item>
for ( int i = 0; i < nl.getLength();i++) {
// while(counter< nl.getLength())
// {
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
//map.put(KEY_EXAMSET, parser.getValue(e, KEY_EXAMSET));
menuKeys.add( parser.getValue(e, KEY_SETID));
menuItems.add( parser.getValue(e, KEY_SETNAME));
//Log.i("Set ID: ", parser.getValue(e, KEY_SETID));
//Log.i("Set Name: ", parser.getValue(e, KEY_SETNAME));
}
}
// add items into exam list spinner dynamically
public void addItemsOnExamListSpinner()
{
List<String> list = new ArrayList<String>();
list.add("Speed Test 150(min) PO Set-01");
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, menuItems);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
exam_list_spinner.setAdapter(dataAdapter);
}
}
注意：简单替换即可。我只更改了detailsBtn.setOnClickListener(new View.OnClickListener() {和parseExamList()中的代码，并在类级别声明了两个ArrayLists。它，看看你在启动新活动之前是否在点击详细信息按钮上获得了两个Toast。
更新：我假设您已按照android hive tutorial解析XML。只需在getValue类中更改XMLParser函数：< / p>
public String getValue(Element item, String str) {
NodeList n = item.getElementsByTagName(str);
return this.getElementValue(n.item(0));
}
但是如果你不遵循那个......那么按照那个教程来构建解析器就可以解决你的问题.Insha Allah。如果我帮助你找到解决方案，请将其标记为答案
答案 2 :(得分：1)
Spinner spinnerLocation;
spinnerLocation = (Spinner)findViewById(R.id.spinnerLocation);
ArrayList<String> locationArray = new ArrayList<String>();
for(int i=0;i<10;i++)
{
locationArray.add("value "+i);
}
ArrayAdapter<String> locationAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, locationArray);
locationAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerLocation = (Spinner)findViewById(R.id.spinnerLocation);
spinnerLocation.setAdapter(locationAdapter);
spinnerLocation.setAdapter(locationAdapter);
spinnerLocation.setOnItemSelectedListener(new OnItemSelectedListener() {
int count=0;
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3)
{
System.out.println("whatever you wanna do");
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
Toast.makeText(getBaseContext(),"inside no item selected ",Toast.LENGTH_SHORT).show();
}
});
答案 3 :(得分：1)
我已经通过将我的代码xml解析代码更改为：
来完成解决方法void parse_ExamList()
{
ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
Document doc = parser.getDomElement(xmlContent); // getting DOM element
//list object to populate spinner
List<String> list = new ArrayList<String>();
NodeList nl = doc.getElementsByTagName(KEY_EXAMSET);
// looping through all item nodes <item>
for ( int i = 0; i < nl.getLength();i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
//map.put(KEY_EXAMSET, parser.getValue(e, KEY_EXAMSET));
map.put(KEY_SETID, parser.getValue(e, KEY_SETID));
map.put(KEY_SETNAME, parser.getValue(e, KEY_SETNAME));
//adding items to spinners
list.add("("+parser.getValue(e, KEY_SETID)+") "+parser.getValue(e, KEY_SETNAME));
menuItems.add(map);
}
//populating the spinner with the list items
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
exam_list_spinner.setAdapter(dataAdapter);
}
但问题是，id和name都显示在微调器中，我只想显示名称并在显示时隐藏id。但是稍后我将要求具有所选名称的id