我开发了一个购物应用程序。我正在使用网络服务来获取物品。我在 asynctask 中调用 Web 服务功能，并成功获取项目。但是我添加了登录页面，当用户登录时，用户导航到项目页面，然后 asynctask 无法获得结果。在调试 asynctask 时有效，但在正常运行应用程序时 asynctask 不起作用。如果我在微调器上选择类别，则 asynctask 可以工作。我认为，它是关于在微调器选定项目上调用 asynctask，但我不知道如何修复它。
同样，调试程序按预期工作，但是当我正常运行应用程序时，asynctask 无法获取项目。我必须按预期为作品选择微调器中的类别。
登录页面：
public class LoginUser extends AsyncTask<String,String,String>{
private ProgressDialog dialog = new ProgressDialog(LoginActivity.this);
private String UName;
private String PWord;
public LoginUser(String user_name,String pass_word){
this.UName = user_name;
this.PWord = pass_word;
}
@Override
protected void onPreExecute() {
dialog.setMessage("Please wait...");
dialog.show();
}
@Override
protected String doInBackground(String... params) {
String uid = GetUser(UName,PWord);
return uid;
}
protected void onPostExecute(String uid){
if(uid.equals("0")){
Toast toast = Toast.makeText(getBaseContext(), "Login failed.", Toast.LENGTH_SHORT);
toast.show();
}
else{
SPE = SP.edit();
SPE.putString("username", username);
SPE.putString("password", password);
SPE.putString("user_id", user_id);
SPE.commit();
Intent intent = new Intent(LoginActivity.this,MainActivity.class);
bundle.putString("login", "login");
intent.putExtras(bundle);
startActivity(intent);
}
dialog.dismiss();
}
}
项目页面：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
intent = new Intent(MainActivity.this,ItemActivity.class);
bundle = new Bundle();
veriler = getIntent().getExtras();
String PageLogin = "";
PageLogin = veriler.getString("login");
spn = (Spinner)findViewById(R.id.spinner1);
items = new String[4][0];
categories = new String[11];
categories[0] = "All";
categories[1] = "Computers";
categories[2] = "Mobile";
categories[3] = "Home Electronics";
categories[4] = "Fashion";
categories[5] = "Magazines";
categories[6] = "Health & Beauty";
categories[7] = "Movie & Music";
categories[8] = "Furnitures";
categories[9] = "Toys";
categories[10] = "Accessories";
ArrayAdapter<String> spn_adapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_spinner_item, categories);
spn_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spn.setAdapter(spn_adapter);
if(PageLogin.equals("login")){
CatID="0";
new GetAllItemsAS().execute();
}
spn.setOnItemSelectedListener(new OnItemSelectedListener(){
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
selectedCat = spn.getSelectedItem().toString().trim();
if(selectedCat.equals("All")){
CatID="0";
}
else if(selectedCat.equals("Computers")){
CatID="1";
}
else if(selectedCat.equals("Mobile")){
CatID="2";
}
else if(selectedCat.equals("Home Electronics")){
CatID="3";
}
else if(selectedCat.equals("Fashion")){
CatID="4";
}
else if(selectedCat.equals("Magazines")){
CatID="5";
}
else if(selectedCat.equals("Health & Beauty")){
CatID="6";
}
else if(selectedCat.equals("Movie & Music")){
CatID="7";
}
else if(selectedCat.equals("Furnitures")){
CatID="8";
}
else if(selectedCat.equals("Toys")){
CatID="9";
}
else if(selectedCat.equals("Accessories")){
CatID="10";
}
new GetAllItemsAS().execute();
}
public void onNothingSelected(AdapterView<?> arg0) {
CatID="0";
new GetAllItemsAS().execute();
}
});
}
所有代码：
登录活动：
public class LoginActivity extends Activity {
SharedPreferences SP;
SharedPreferences.Editor SPE;
private String username;
private String password;
private String user_id;
private Bundle bundle;
private String _username;
private String _password;
private TextView _usernameTxt;
private TextView _passwordTxt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
bundle = new Bundle();
SP = getSharedPreferences("UserInfoXML", MODE_PRIVATE);
_usernameTxt = (TextView)findViewById(R.id.userNameSignInTxt);
_passwordTxt = (TextView)findViewById(R.id.PasswordSignInTxt);
Button login = (Button)findViewById(R.id.SignInButton);
login.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
username = _usernameTxt.getText().toString();
password = _passwordTxt.getText().toString();
new LoginUser(username,password).execute();
}
});
}
public class LoginUser extends AsyncTask<String,String,String>{
private ProgressDialog dialog = new ProgressDialog(LoginActivity.this);
private String UName;
private String PWord;
public LoginUser(String user_name,String pass_word){
this.UName = user_name;
this.PWord = pass_word;
}
@Override
protected void onPreExecute() {
dialog.setMessage("Please wait...");
dialog.show();
}
@Override
protected String doInBackground(String... params) {
String uid = GetUser(UName,PWord);
return uid;
}
protected void onPostExecute(String uid){
if(uid.equals("0")){
Toast toast = Toast.makeText(getBaseContext(), "Login failed.", Toast.LENGTH_SHORT);
toast.show();
}
else{
SPE = SP.edit();
SPE.putString("username", username);
SPE.putString("password", password);
SPE.putString("user_id", user_id);
SPE.commit();
Intent intent = new Intent(LoginActivity.this,MainActivity.class);
bundle.putString("login", "login");
intent.putExtras(bundle);
startActivity(intent);
}
dialog.dismiss();
}
}
public String GetUser(String user_name,String pass_word){
String id = null;
PropertyInfo kulad = new PropertyInfo();
kulad.name= "username";
kulad.setValue(user_name);
kulad.type = PropertyInfo.STRING_CLASS;
PropertyInfo parola = new PropertyInfo();
parola.name= "password";
parola.setValue(pass_word);
parola.type = PropertyInfo.STRING_CLASS;
SoapObject request = new SoapObject("http://shopar.org/", "Login");
request.addProperty(kulad);
request.addProperty(parola);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.bodyOut=request;
envelope.dotNet = true;
envelope.setOutputSoapObject(request);
HttpTransportSE androidHttpTransport = new HttpTransportSE("http://service.melihmucuk.com/ShopArWS.asmx");
androidHttpTransport.debug = true;
try {
androidHttpTransport.call("http://shopar.org/Login", envelope);
SoapPrimitive response = (SoapPrimitive) envelope.getResponse();
id = String.valueOf(response.toString());
}
catch (Exception e) {
e.printStackTrace();
id = "0";
}
return id;
}
主要活动：
public class MainActivity extends Activity {
private String[] categories;
private String[][] items;
private String selectedCat = "All";
private String CatID = "0";
private Spinner spn;
private Intent intent;
private Bundle bundle;
private Bundle veriler;
private String[][] GetAllItems(){
SoapObject request = new SoapObject("http://shopar.org/", "GetAllItem");
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = true;
envelope.setOutputSoapObject(request);
//http://192.168.2.240/ShopArService/ShopArWS.asmx
HttpTransportSE androidHttpTransport = new HttpTransportSE("http://service.melihmucuk.com/ShopArWS.asmx");
androidHttpTransport.debug = true;
try {
androidHttpTransport.call("http://shopar.org/GetAllItem", envelope);
SoapObject response = (SoapObject) envelope.getResponse();
int allCounter=0;
int catCounter=0;
String cat_id="";
for(int i=0;i<response.getPropertyCount();i++){
Object property = response.getProperty(i);
if(property instanceof SoapObject){
SoapObject item = (SoapObject) property;
cat_id = item.getProperty("cat_id").toString();
if(CatID.equals("0")){
allCounter++;
}
else if(CatID.equals(cat_id)){
catCounter++;
}
}
}
if(CatID.equals("0")){
items[0] = new String[response.getPropertyCount()]; //item_id
items[1] = new String[response.getPropertyCount()]; //price
items[2] = new String[response.getPropertyCount()]; //title
items[3] = new String[response.getPropertyCount()]; //desc
for(int i=0;i<response.getPropertyCount();i++){
Object property = response.getProperty(i);
if(property instanceof SoapObject){
SoapObject item = (SoapObject) property;
String item_id = item.getProperty("item_id").toString();
String price = item.getProperty("price").toString() + " TL";
String title = item.getProperty("title").toString();
String desc = item.getProperty("desc").toString();
items[0][i] = item_id;
items[1][i] = price;
items[2][i] = title;
items[3][i] = desc;
}
}
}
else{
items[0] = new String[catCounter]; //item_id
items[1] = new String[catCounter]; //price
items[2] = new String[catCounter]; //title
items[3] = new String[catCounter]; //desc
for(int k=0;k<catCounter;k++){
for(int i=0;i<response.getPropertyCount();i++){
Object property = response.getProperty(i);
if(property instanceof SoapObject){
SoapObject item = (SoapObject) property;
String item_id = item.getProperty("item_id").toString();
String price = item.getProperty("price").toString() + " TL";
String title = item.getProperty("title").toString();
String desc = item.getProperty("desc").toString();
String catid = item.getProperty("cat_id").toString();
List <String> list = Arrays.asList(items[0]);
if(CatID.equals(catid)){
if(list.contains(item_id)){
}
else{
items[0][k] = item_id;
items[1][k] = price;
items[2][k] = title;
items[3][k] = desc;
break;
}
}
}
}
}
}
}
catch (Exception e) {
e.printStackTrace();
}
return items;
}
public class GetAllItemsAS extends AsyncTask<String,String,String[][]>{
private ProgressDialog dialog = new ProgressDialog(MainActivity.this);
@Override
protected void onPreExecute() {
dialog.setMessage("Loading...");
dialog.show();
}
@Override
protected String[][] doInBackground(String... params) {
GetAllItems();
return items;
}
protected void onPostExecute(String[][] items){
ASFinish();
dialog.dismiss();
}
}
public void ASFinish(){
ListView liste = (ListView)findViewById(R.id.listView1);
ListArrayAdapter adapter = new ListArrayAdapter(MainActivity.this,items[2],items[3],items[1],items[0]);
liste.setAdapter(adapter);
liste.setOnItemClickListener(new AdapterView.OnItemClickListener(){
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
bundle.putString("item_id", items[0][arg2]);
intent.putExtras(bundle);
startActivity(intent);
}
});
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// intent = new Intent(MainActivity.this,ItemActivity.class);
// bundle = new Bundle();
veriler = getIntent().getExtras();
String PageLogin = "";
if(veriler != null){
PageLogin = veriler.getString("login");
}
spn = (Spinner)findViewById(R.id.spinner1);
items = new String[4][0];
categories = new String[11];
categories[0] = "All";
categories[1] = "Computers";
categories[2] = "Mobile";
categories[3] = "Home Electronics";
categories[4] = "Fashion";
categories[5] = "Magazines";
categories[6] = "Health & Beauty";
categories[7] = "Movie & Music";
categories[8] = "Furnitures";
categories[9] = "Toys";
categories[10] = "Accessories";
ArrayAdapter<String> spn_adapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_spinner_item, categories);
spn_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spn.setAdapter(spn_adapter);
if(PageLogin.equals("login")){
CatID="0";
new GetAllItemsAS().execute();
}
spn.setOnItemSelectedListener(new OnItemSelectedListener(){
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
selectedCat = spn.getSelectedItem().toString().trim();
if(selectedCat.equals("All")){
CatID="0";
}
else if(selectedCat.equals("Computers")){
CatID="1";
}
else if(selectedCat.equals("Mobile")){
CatID="2";
}
else if(selectedCat.equals("Home Electronics")){
CatID="3";
}
else if(selectedCat.equals("Fashion")){
CatID="4";
}
else if(selectedCat.equals("Magazines")){
CatID="5";
}
else if(selectedCat.equals("Health & Beauty")){
CatID="6";
}
else if(selectedCat.equals("Movie & Music")){
CatID="7";
}
else if(selectedCat.equals("Furnitures")){
CatID="8";
}
else if(selectedCat.equals("Toys")){
CatID="9";
}
else if(selectedCat.equals("Accessories")){
CatID="10";
}
new GetAllItemsAS().execute();
}
public void onNothingSelected(AdapterView<?> arg0) {
CatID="0";
new GetAllItemsAS().execute();
}
});
}