我想在我的Android应用程序中实现谷歌类型搜索，为此我使用了自动完成textview，当我逐个输入字符时它非常有用，但是当我同时输入多个字符时出现问题，我的应用程序显示了一个对话框并被迫关闭。 在此先感谢
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
答案 0 :(得分：1)
这是我的朋友pskink建议的工作解决方案
public class TestActivity 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;
private static final int ADDRESS_TRESHOLD = 2;
private Filter filter;
@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
}
});
String[] from = { "name" };
int[] to = { android.R.id.text1 };
SimpleCursorAdapter a = new SimpleCursorAdapter(this,
android.R.layout.simple_dropdown_item_1line, null, from, to, 0);
a.setStringConversionColumn(1);
FilterQueryProvider provider = new FilterQueryProvider() {
@Override
public Cursor runQuery(CharSequence constraint) {
// run in the background thread
if (constraint == null) {
return null;
}
String[] columnNames = { Columns._ID, "name" };
MatrixCursor c = new MatrixCursor(columnNames);
try {
// total code for implementing my way of auto complte
String SOAP_ACTION = "your action";
String NAMESPACE = "your name space";
String METHOD_NAME = "your method name";
String URL = "your Url";
SoapObject objSoap = null;
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
// Use this to add parameters
request.addProperty("KEY", yourkey);
request.addProperty("Key", constraint);
request.addProperty("Key", Id);
// 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
androidHttpTransport.call(SOAP_ACTION, envelope);
// Get the SoapResult from the envelope body.
objSoap = (SoapObject) envelope.getResponse();
if (objSoap != null) {
String strData = objSoap.toString();
}
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;
c.newRow()
.add(i)
.add(objNew.getProperty("Itemname")
.toString());
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return c;
}
};
a.setFilterQueryProvider(provider);
txtAutoComplete.setAdapter(a);
} // on create ends
} // final class ends
答案 1 :(得分：1)
你可以像这样使用asynytask
public class GetLocations extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = manager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = manager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (isGPSEnabled) {
/*
* Criteria criteria = new Criteria(); String bestProvider =
* manager.getBestProvider(criteria, false); Location location =
* manager.getLastKnownLocation(bestProvider); double lat
* =location.getLatitude(); double longi
* =location.getLongitude();
* System.out.println("getting location continous ////// Lattti "
* +location.getLatitude() );
* System.out.println("getting location continous ////// LONGITU "
* + location.getLongitude());
*/
manager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 3000, 0, mylistener);
} else {
Toast.makeText(MyService.this, "Please oN Gps ",
Toast.LENGTH_LONG).show();
}
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
// getting current lattitude and longitude
return null;
}
}
答案 2 :(得分：0)
您可以在AsyncTask的preExecute（）方法中设置全局布尔值。一旦设置了布尔值，就取消之前的AsynTask（即如果AsyncTask已经运行）。多数民众赞成。
请参阅http://developer.android.com/reference/android/os/AsyncTask.html了解AsyncTask的使用情况