android - Google Places Error -


i'm trying perform search using google places api in app i'm getting error.

my code:

public class googleplaces {      /** global instance of http transport. */     private static final httptransport http_transport = new nethttptransport();       private static final string api_key = "";       // google places serach url's     private static final string places_search_url = "https://maps.googleapis.com/maps/api/place/search/json?";     private static final string places_details_url = "https://maps.googleapis.com/maps/api/place/details/json?";      private double _latitude;     private double _longitude;     private double _radius;      /**      * searching places      * @param latitude - latitude of place      * @params longitude - longitude of place      * @param radius - radius of searchable area      * @param types - type of place search      * @return list of places      * */     public placeslist search(double latitude, double longitude, double radius, string types)             throws exception {          this._latitude = latitude;         this._longitude = longitude;         this._radius = radius;            try {             httprequestfactory httprequestfactory = createrequestfactory(http_transport);             httprequest request ;             request  = httprequestfactory.buildgetrequest(new genericurl(places_search_url));             request.geturl().put("key", api_key);             request.geturl().put("location", _latitude + "," + _longitude);             request.geturl().put("radius", _radius); // in meters             request.geturl().put("sensor", "false");             if(types != null)                 request.geturl().put("types", types);              placeslist list = request.execute().parseas(placeslist.class);             // check log cat places response status             log.d("places status", "" + list.status);             return list;          } catch (httpresponseexception e) {             log.e("error:", e.getmessage());             return null;         }      }      /**      * searching single place full details      * @paramrefrence - reference id of place      *                 - in search api request      * */     public placedetails getplacedetails(string reference) throws exception {         try {              httprequestfactory httprequestfactory = createrequestfactory(http_transport);             httprequest request = httprequestfactory                     .buildgetrequest(new genericurl(places_details_url));             request.geturl().put("key", api_key);             request.geturl().put("reference", reference);             request.geturl().put("sensor", "false");              placedetails place = request.execute().parseas(placedetails.class);              return place;          } catch (httpresponseexception e) {             log.e("error in perform detail", e.getmessage());             throw e;         }     }      /**      * creating http request factory      * */     public static httprequestfactory createrequestfactory(             final httptransport transport) {         return transport.createrequestfactory(new httprequestinitializer() {             public void initialize(httprequest request) {                 googleheaders headers = new googleheaders();                 headers.setapplicationname("com-xink-vn");                 request.setheaders(headers);                 jsonhttpparser parser = new jsonhttpparser(new jacksonfactory());                 request.addparser(parser);             }         });     }  }

error log:

 java.lang.runtimeexception: error occured while executing doinbackground()         @ android.os.asynctask$3.done(asynctask.java:299)         @ java.util.concurrent.futuretask$sync.innersetexception(futuretask.java:273)         @ java.util.concurrent.futuretask.setexception(futuretask.java:124)         @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:307)         @ java.util.concurrent.futuretask.run(futuretask.java:137)         @ android.os.asynctask$serialexecutor$1.run(asynctask.java:230)         @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1076)         @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:569)         @ java.lang.thread.run(thread.java:856)  caused by: java.lang.noclassdeffounderror: com.google.common.base.preconditions         @ com.google.api.client.util.classinfo.<init>(classinfo.java:164)         @ com.google.api.client.util.classinfo.of(classinfo.java:92)         @ com.google.api.client.util.genericdata.<init>(genericdata.java:79)         @ com.google.api.client.util.genericdata.<init>(genericdata.java:61)         @ com.google.api.client.http.genericurl.<init>(genericurl.java:97)         @ com.vog.utils.googleplaces.search(googleplaces.java:59)         @ com.vog.xink.editpictureactivity$loadplaces.doinbackground(editpictureactivity.java:606)         @ com.vog.xink.editpictureactivity$loadplaces.doinbackground(editpictureactivity.java:576)         @ android.os.asynctask$2.call(asynctask.java:287)         @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:305)             at java.util.concurrent.futuretask.run(futuretask.java:137)             at android.os.asynctask$serialexecutor$1.run(asynctask.java:230)             at java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1076)             at java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:569)             at java.lang.thread.run(thread.java:856)


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