NULL-Objekt erhalten - Daten von einer Aktivität an eine andere senden

Question

Ich habe eine Klasse, die serializable implementiert und ich versuche, es Objekt mit Absicht zu senden, so bekomme ich Null-Objekt, wenn ich dieses Objekt mit putExtra() setzen;

Unten ist mein Code.

YelpSearch.java (fromClass)

import android.app.ListActivity; 
import android.support.v4.app.Fragment; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.Window; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.io.Serializable; 
import java.util.ArrayList; 
import java.util.Collections; 
import java.util.List; 

public class YelpSearch extends ListActivity implements Serializable { 

    @SuppressWarnings("serial") 
    class Business implements Serializable { 
     final String name; 
     final String url; 
     final String id; 


     public Business(String name, String url, String id) { 
      this.name = name; 
      this.url = url; 
      this.id = id; 
     } 


     @Override 
     public String toString() { 
      return name; 
     } 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); 
     super.onCreate(savedInstanceState); 
     setTitle("Finding Tacos..."); 
     setProgressBarIndeterminateVisibility(true); 
     Log.v("TAG","YelpSearchOnCreate"); 

     new AsyncTask<Void, Void, List<Business>>() { 
      @Override 
      protected List<Business> doInBackground(Void... params) { 
       Log.v("TAG","Async List"); 

       String businesses = Yelp.getYelp(YelpSearch.this).search("food", "91754"); 
       Log.v("TAG","String businsesses"+businesses); 
       try { 
        Log.v("TAG","try"); 
        return processJson(businesses); 
       } catch (JSONException e) { 
        return Collections.<Business>emptyList(); 
       } 
      } 

      @Override 
      protected void onPostExecute(List<Business> businesses) { 
       Log.v("TAG","onPostExecute"); 
       Log.v("BusinessesList","Businesses "+ businesses); 
       //setTitle("Tacos Found"); 
       setProgressBarIndeterminateVisibility(false); 
       getListView().setAdapter(new ArrayAdapter<Business>(YelpSearch.this, android.R.layout.simple_list_item_1, businesses)); 

      } 
     }.execute(); 
    } 

    @Override 
    protected void onListItemClick(ListView listView, View view, int position, long id) { 
     Business biz = (Business) listView.getItemAtPosition(position); 
     Log.v("Sending data to Detail","hi "+biz); 
     //startActivity(new Intent(Intent.ACTION_VIEW,Uri.parse(biz.url))); 
     Intent intent = new Intent(getApplicationContext(), YelpBizDetail.class); 
     // Intent intent = new Intent(YelpSearch.this,YelpBizDetail.class).putExtra("myCustomerObj",biz); 
     intent.putExtra("Detailclass",biz); 

     Log.v("Sending data to Detail","sent "+biz); 
     startActivity(intent); 
    } 

    List<Business> processJson(String jsonStuff) throws JSONException { 
     JSONObject json = new JSONObject(jsonStuff); 
     JSONArray businesses = json.getJSONArray("businesses"); 

     ArrayList<Business> businessObjs = new ArrayList<Business>(businesses.length()); 
     for (int i = 0; i < businesses.length(); i++) { 
      JSONObject business = businesses.getJSONObject(i); 
      businessObjs.add(new Business(business.optString("name"), business.optString("mobile_url"),business.optString("id"))); 
     } 
     return businessObjs; 
    } 
} 

YelpBizDetail (toClass)

import android.app.Activity; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.ArrayAdapter; 


import com.....projectmaw.YelpSearch.Business; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.io.Serializable; 
import java.util.ArrayList; 
import java.util.Collections; 
import java.util.List; 


public class YelpBizDetail extends Activity { 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.yelp_biz_detail); 
     Intent i = getIntent(); 
     Business biz = (Business) i.getSerializableExtra("Detailclass"); 
     // String biz = (String) i.getSerializableExtra("Detailclass"); 

     //String biz = (String) i.getSerializableExtra("Detailclass"); 
     Log.v("Received on Detail","data "+biz); 
    } 



} 

Answer 1

Versuchen Sie, einige Änderungen in onListItemClick in Ihrem YelpSearch.java machen, wie dies Ihr startActivity(intent) mit startActivity(new Intent(getApplicationContext(), YelpBizDetail.class).putExtra("Detailclass",biz)); ändern erstellen neue Absicht, wenn neue Aktivität gestartet wird. und entfernen

Log.v("Sending data to Detail","hi "+biz); 
     //startActivity(new Intent(Intent.ACTION_VIEW,Uri.parse(biz.url))); 
     Intent intent = new Intent(getApplicationContext(), YelpBizDetail.class); 
     // Intent intent = new Intent(YelpSearch.this,YelpBizDetail.class).putExtra("myCustomerObj",biz); 
     intent.putExtra("Detailclass",biz); 

     Log.v("Sending data to Detail","sent "+biz);