我使用过listview man times但我从来没有遇到过这样的问题。我收到了像
这样的错误java.lang.IllegalStateException：适配器的内容已更改，但ListView未收到通知。确保不从后台线程修改适配器的内容，而只是从UI线程修改。确保适配器在其内容更改时调用notifyDataSetChanged（）。 [在ListView（2131558770，类android.widget.ListView）中使用Adapter（class shoppingmazza.android.catalyst.com.shoppingmazza.activity.SearchAdapter）]
这里是我的搜索引擎： -
import java.util.ArrayList;
import shoppingmazza.android.catalyst.com.shoppingmazza.R;
/**
* Created by ANDROID on 10/26/2015.
*
*/
public class SearchAdapter extends ArrayAdapter<SearchItem> {
static ArrayList<SearchItem> productsList;
LayoutInflater vi;
int Resource;
ViewHolder holder;
public SearchAdapter(Context context, int resource, ArrayList<SearchItem> object) {
super(context, resource, object);
vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
productsList = object;
Resource = resource;
// this.context = context;
}
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
holder = new ViewHolder();
v = vi.inflate(Resource, null);
holder.search_name = (TextView)v.findViewById(R.id.text_name_search);
holder.serch_id = (TextView)v.findViewById(R.id.text_id_serach);
v.setTag(holder);
}
else{
holder = (ViewHolder)v.getTag();
}
String content = productsList.get(position).getName();
content = content.replace("'", "");
content = content.replace("&", "");
holder.search_name.setText(content);
holder.serch_id.setText(productsList.get(position).getid());
return v;
}
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
static class ViewHolder{
public TextView search_name;
public TextView serch_id;
}
}
这里是我的活动课： -
public class SearchActivity extends AppCompatActivity {
private Toolbar mToolbar;
private ListView listview;
private EditText editText;
private String searchtext;
private SearchAdapter adapter;
private ArrayList<SearchItem> SearchItem = new ArrayList<>();
private ImageView imageView;
// flag for Internet connection status
Boolean isInternetPresent = false;
// Connection detector class
ConnectionDetector cd;
AlertDialogManager alert = new AlertDialogManager();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_activity);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setTitle(null);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
cd = new ConnectionDetector(getApplicationContext());
//Button button = (Button)findViewById(R.id.clear_text);
imageView = (ImageView)findViewById(R.id.cross_btn);
listview = (ListView)findViewById(R.id.search_item);
editText = (EditText)findViewById(R.id.myEditText);
adapter = new SearchAdapter(getApplicationContext(),R.layout.search_item_show,SearchItem);
editText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
SearchItem.clear();
adapter.notifyDataSetChanged();
isInternetPresent = cd.isConnectingToInternet();
if(isInternetPresent){
new SearchItemFind().execute(CollectionOfAllURL.SearchItemFind);
}
else {
alert.showAlertDialog(SearchActivity.this, "No Internet Connection",
"You don't have internet connection.", false);
}
}
});
editText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if(actionId == EditorInfo.IME_ACTION_SEARCH){
isInternetPresent = cd.isConnectingToInternet();
if(isInternetPresent){
// new SearchItemFind().execute("http://www.shoppingmazza.com/?route=feed/web_api/livesearch");
new SearchItemActionFind().execute(CollectionOfAllURL.SearchItemFind);
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
inputMethodManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
}
else {
alert.showAlertDialog(SearchActivity.this, "No Internet Connection",
"You don't have internet connection.", false);
}
return true;
}
return false;
}
});
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String svalue = SearchAdapter.productsList.get(position).getSvalue();
String menu_id = SearchAdapter.productsList.get(position).getid();
if(svalue.equals("0")){
Intent i = new Intent(SearchActivity.this, ProductsCategory.class);
i.putExtra("category", menu_id);
startActivity(i);
}
else {
Intent i = new Intent(SearchActivity.this, ProductsDetails.class);
i.putExtra("product_id", menu_id);
startActivity(i);
}
}
});
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(null);
}
});
}
public class SearchItemFind extends AsyncTask<String,Void,Void>{
Boolean result ,trycatch = true;
JSONArray jsonArray;
JSONArray jsonArray1;
Boolean firstBool,secondBool;
@Override
protected void onPreExecute() {
super.onPreExecute();
searchtext = editText.getText().toString();
/* SearchItem.clear();
searchCateogry.clear();*/
SearchItem.clear();
adapter.notifyDataSetChanged();
}
@Override
protected Void doInBackground(String... params) {
try{
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(params[0]);
List<NameValuePair> nameValuePairs = new ArrayList<>(1);
nameValuePairs.add(new BasicNameValuePair("searchdata", searchtext));
post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = client.execute(post);
if(response.getStatusLine().getStatusCode()==200) {
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(data);
jsonArray = jsonObject.getJSONArray("category");
jsonArray1 = jsonObject.getJSONArray("products");
if(jsonArray.length() > 1){
firstBool = true;
}
else {
firstBool = false;
}
if(jsonArray1.length() > 1){
secondBool = true;
}
else {
secondBool = false;
}
JSONArray result = new JSONArray();
if(firstBool){
for (int i = 0; i < jsonArray.length(); i++) {
result.put(jsonArray.get(i));
}
}
if(secondBool){
for (int i = 0; i < jsonArray1.length(); i++) {
result.put(jsonArray1.get(i));
}
}
for(int i=0;i<result.length();i++){
Log.d("resukt",result+"");
JSONObject jsonObject1 = result.getJSONObject(i);
SearchItem search = new SearchItem();
search.setName(jsonObject1.getString("name"));
search.setid(jsonObject1.getString("id"));
search.setSvalue(jsonObject1.getString("svalue"));
SearchItem.add(search);
}
/* JSONArray mainJson = concatArray(jsonArray,jsonArray1);
for(int i=0;i<mainJson.length();i++){
JSONObject jsonObject1 = mainJson.getJSONObject(i);
SearchItem search = new SearchItem();
search.setName(jsonObject1.getString("name"));
search.setid(jsonObject1.getString("id"));
search.setSvalue(jsonObject1.getString("svalue"));
SearchItem.add(search);
}*/
/* if (jsonArray.length() > 1) {
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
SearchItem search = new SearchItem();
search.setName(jsonObject1.getString("name"));
search.setid(jsonObject1.getString("id"));
search.setSvalue(jsonObject1.getString("svalue"));
SearchItem.add(search);
}
}*/
/* if (jsonArray.length() > 1) {
for (int i = 0; i < jsonArray1.length(); i++) {
JSONObject jsonObject1 = jsonArray1.getJSONObject(i);
SearchItem search = new SearchItem();
search.setName(jsonObject1.getString("name"));
search.setid(jsonObject1.getString("pid"));
search.setSvalue(jsonObject1.getString("svalue"));
SearchItem.add(search);
}
}*/
}
else {
trycatch = false;
}
}catch (IOException |JSONException e){
Log.e("Error :", e.getMessage());
trycatch = false;
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
//super.onPostExecute(aVoid);
// dialog.dismiss();
if(trycatch) {
adapter.notifyDataSetChanged();
adapter = new SearchAdapter(SearchActivity.this,R.layout.search_item_show,SearchItem);
listview.setAdapter(adapter);
adapter.notifyDataSetChanged();
/* try {
concatArray(jsonArray,jsonArray1);
}
catch (Exception e){
e.getMessage();
}*/
}
else {
Toast.makeText(SearchActivity.this,"Something is bad happen try again later",Toast.LENGTH_LONG).show();
}
}
}
public class SearchItemActionFind extends AsyncTask<String,Void,Void>{
Boolean result ,trycatch = true;
JSONArray jsonArray;
JSONArray jsonArray1;
Boolean firstBool,secondBool;
@Override
protected void onPreExecute() {
super.onPreExecute();
searchtext = editText.getText().toString();
SearchItem.clear();
adapter.notifyDataSetChanged();
}
@Override
protected Void doInBackground(String... params) {
try{
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(params[0]);
List<NameValuePair> nameValuePairs = new ArrayList<>(1);
nameValuePairs.add(new BasicNameValuePair("searchdata", searchtext));
post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = client.execute(post);
if(response.getStatusLine().getStatusCode()==200){
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(data);
jsonArray = jsonObject.getJSONArray("category");
jsonArray1 = jsonObject.getJSONArray("products");
if(jsonArray.length() > 1){
firstBool = true;
}
else {
firstBool = false;
}
if(jsonArray1.length() > 1){
secondBool = true;
}
else {
secondBool = false;
}
JSONArray result = new JSONArray();
if(firstBool){
for (int i = 0; i < jsonArray.length(); i++) {
result.put(jsonArray.get(i));
}
}
if(secondBool){
for (int i = 0; i < jsonArray1.length(); i++) {
result.put(jsonArray1.get(i));
}
}
for(int i=0;i<result.length();i++){
JSONObject jsonObject1 = result.getJSONObject(i);
SearchItem search = new SearchItem();
search.setName(jsonObject1.getString("name"));
search.setid(jsonObject1.getString("id"));
search.setSvalue(jsonObject1.getString("svalue"));
SearchItem.add(search);
}
/* if (jsonArray.length() > 1) {
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
SearchItem search = new SearchItem();
search.setName(jsonObject1.getString("name"));
search.setid(jsonObject1.getString("id"));
search.setSvalue(jsonObject1.getString("svalue"));
SearchItem.add(search);
}
}*/
/* if (jsonArray.length() > 1) {
for (int i = 0; i < jsonArray1.length(); i++) {
JSONObject jsonObject1 = jsonArray1.getJSONObject(i);
SearchItem search = new SearchItem();
search.setName(jsonObject1.getString("name"));
search.setid(jsonObject1.getString("id"));
search.setSvalue(jsonObject1.getString("svalue"));
SearchItem.add(search);
}
}*/
}
}catch (IOException |JSONException e){
// Log.e("Error :", e.getMessage());
trycatch = false;
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
//super.onPostExecute(aVoid);
// dialog.dismiss();
if(trycatch) {
adapter.notifyDataSetChanged();
adapter = new SearchAdapter(SearchActivity.this,R.layout.search_item_show,SearchItem);
listview.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
else {
Toast.makeText(SearchActivity.this,"Something is bad happen try again later",Toast.LENGTH_LONG).show();
}
}
}
}
我是Android开发新手请帮我解决这个错误。
答案 0 :(得分：1)
因为您正在后台线程中更改适配器中使用的数组。 你在打电话：
SearchItem.add(search);
doInbackground方法中的。而是在onPostExecute方法中执行此操作。