android - 从服务器动态添加数据以自动完成Textview

Question

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 ，当我一个一个地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行关闭。 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

Answer 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;
        }
    }