【发布时间】：2013-11-15 10:03:25
【问题描述】：
我想在我的 android 应用程序中实现 google 类型搜索，为此我使用了自动完成文本视图，当我一个一个输入字符时它非常有效，但是当我同时输入多个字符时会出现问题，我的应用程序显示一个对话框并强制关闭。 提前致谢
public class Activity_ListItem extends Activity {
public Context mContext;
// views declaration
public AutoCompleteTextView txtAutoComplete;
public ListView lvItems;
// arrayList for Adaptor
ArrayList<String> listItems;
// getting input from AutocompleteTxt
String strItemName;
// making Adaptor for autocompleteTextView
ArrayAdapter<String> adaptorAutoComplete;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// for showing full screen
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_listitem);
mContext = this;
listItems = new ArrayList<String>();
// Declaring and getting all views objects
Button btnShare = (Button) findViewById(R.id.ListItem_btnShare);
Button btnSort = (Button) findViewById(R.id.ListItem_btnSort);
lvItems = (ListView) findViewById(R.id.ListItem_lvItem);
txtAutoComplete = (AutoCompleteTextView) findViewById(R.id.ListItem_autoComplete);
// adding listeners to button
btnShare.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
});
btnSort.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
});
// setting adaptor to autoComplete TextView
// adaptorAutoComplete = new ArrayAdapter<String>(mContext,android.R.layout.simple_dropdown_item_1line, listItems);
txtAutoComplete.setThreshold(1);
// adding Listener to Auto CompleteText View
txtAutoComplete.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence charEnter, int start, int before,
int count) {
// TODO Auto-generated method stub
strItemName = charEnter.toString();
new FetchItemListFromServer().execute();
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
/* strItemName = txtAutoComplete.getText().toString();
new FetchItemListFromServer().execute();*/
// adaptorAutoComplete.notifyDataSetChanged();
}
});
} // on create ends
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity__list_item, menu);
return true;
} // method ends
public SoapObject getDataFromServer(String product_name, String store_id) {
// all variables for Soap
String SOAP_ACTION = "http://www.SupermarketAPI.com/COMMERCIAL_SearchForItem";
String NAMESPACE = "http://www.SupermarketAPI.com";
String METHOD_NAME = "COMMERCIAL_SearchForItem";
String URL = "http://www.supermarketapi.com/api.asmx?WSDL";
SoapObject objSoap = null;
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
// Use this to add parameters
request.addProperty("APIKEY", "8b0e05b569");
request.addProperty("ItemName",strItemName);
request.addProperty("StoreID", "9829ae4237");
// Declare the version of the SOAP request
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
SoapEnvelope.VER11);
envelope.setOutputSoapObject(request);
envelope.dotNet = true;
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
// this is the actual part that will call the webservice
try {
androidHttpTransport.call(SOAP_ACTION, envelope);
// Get the SoapResult from the envelope body.
objSoap = (SoapObject) envelope.getResponse();
if (objSoap != null) {
String strData = objSoap.toString();
System.out.println("envelop.getResponse//////"
+ strData.toString());
}
} catch (Exception e) {
e.printStackTrace();
}
return objSoap;
} // method ends
public class FetchItemListFromServer extends AsyncTask<Void, Void, Void> {
SoapObject objSoap = null;
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
listItems.clear();
objSoap = getDataFromServer(strItemName, "");
if (objSoap != null) {
System.out.println("getPropertyCountinevents//////////"
+ objSoap.getPropertyCount());
for (int i = 0; i < objSoap.getPropertyCount(); i++) {
Object obj = objSoap.getProperty(i);
if (obj instanceof SoapObject) {
SoapObject objNew = (SoapObject) obj;
listItems
.add(objNew.getProperty("Itemname").toString());
}
}
}
System.out.println("ArrayList size//////////"
+ listItems.size());
runOnUiThread(new Runnable(){
public void run(){
adaptorAutoComplete = new ArrayAdapter<String>(mContext,android.R.layout.simple_dropdown_item_1line, listItems);
txtAutoComplete.setAdapter(adaptorAutoComplete);
adaptorAutoComplete.notifyDataSetChanged();
}
});
return null;
} // method ends
} // asyntask class ends
} // final class ends
【问题讨论】：
-
在这个线程stackoverflow.com/questions/19858843/…中查看我的答案
-
@pskink：我不明白，什么是 SimpleCursorAdaptor。
-
我猜每次文本更改时，它都会启动一个新的线程/异步任务。不要那样做。停止当前正在执行的 Asynctask 并开始一个新的。因此，在任何给定时间点，只有一个后台线程正在执行以获取数据。
-
@AbhishekV 我怎么知道以前的 Asyntask 正在运行以及如何停止它。
-
使用我的解决方案：你不需要处理任何线程/异步任务等
标签： android