Вызов определенных действий в android при щелчке элемента списка

Question

Я хочу позвонить определенному Activity при нажатии элемента списка. Используя операторы if или case в моем обработчике событий click12 и использовании переменной String fclass_state, у меня есть 4 действия для вызова. Как мне это сделать?

public class OutletsList extends ListActivity{ 

// Progress Dialog 
     private ProgressDialog pDialog; 


     // testing on Emulator: 
     private static final String READ_COMMENTS_URL = "myurl"; 



     // JSON IDS: 
     private static final String TAG_SUCCESS = "success"; 
     private static final String TAG_OUTLET_NAME = "outlet_name"; 
     private static final String TAG_POSTS = "posts"; 
     private static final String TAG_SPARKLING_CLASSIFICATION =  "sparkling_classification"; 
     private static final String TAG_SPARKLING_CHANNEL = "sparkling_channel"; 
     private static final String TAG_CLASS = "class"; 


     // An array of all of our comments 
     private JSONArray mOutlets = null; 
     // manages all of our comments in a list. 
     private ArrayList<HashMap<String, String>> mOutletsList; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.outlets_list); 


} 

@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume(); 
    // loading the comments via AsyncTask 
    new LoadMathQuestions().execute(); 
} 

/* public void addComment(View v) { 
    Intent i = new Intent(ReadComments.this, AddComment.class); 
    startActivity(i); 
} 
*/ 
/** 
* Retrieves recent post data from the server. 
*/ 
public void updateJSONdata() { 

    // Instantiate the arraylist to contain all the JSON data. 
    // we are going to use a bunch of key-value pairs, referring 
    // to the json element name, and the content. 

    mOutletsList = new ArrayList<HashMap<String, String>>(); 

    // Instantiating the json parser J parser 
    JSONParser jParser = new JSONParser(); 
    // Feed the beast our comments url, and it spits us 
    // back a JSON object. Boo-yeah Jerome. 
    JSONObject json = jParser.getJSONFromUrl(READ_COMMENTS_URL); 

    //Catcing Exceptions 
    try { 
     //Checking the amount of data rows. 
     mOutlets = json.getJSONArray(TAG_POSTS); 

     // looping through the database 
     for (int i = 0; i < mOutlets.length(); i++) { 
      JSONObject c = mOutlets.getJSONObject(i); 

      // gets the content of each tag 
      String outlet = c.getString(TAG_OUTLET_NAME); 
      String schannel = c.getString(TAG_SPARKLING_CHANNEL); 
      String spclassification = c.getString(TAG_SPARKLING_CLASSIFICATION); 
      String cls = c.getString(TAG_CLASS); 



      HashMap<String, String> map = new HashMap<String, String>(); 

      map.put(TAG_OUTLET_NAME, outlet); 
      map.put(TAG_SPARKLING_CHANNEL, schannel); 
      map.put(TAG_SPARKLING_CLASSIFICATION, spclassification); 
      map.put(TAG_CLASS, cls); 


      // adding HashList to ArrayList 
      mOutletsList.add(map); 

      // JSON data parsing completed by hash mappings 
      // list 
     } 

    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 
} 

/** 
* Inserts the parsed data into the listview. 
*/ 
private void updateList() { 
    // For a ListActivity we need to set the List Adapter, and in order to do 
    //that, we need to create a ListAdapter. This SimpleAdapter, 
    //will utilize our updated Hashmapped ArrayList, 
    //use our single_post xml template for each item in our list, 
    //and place the appropriate info from the list to the 
    //correct GUI id. Order is important here. 
    ListAdapter adapter = new SimpleAdapter(this, mOutletsList, 
      R.layout.single_outlet, new String[] { TAG_OUTLET_NAME, TAG_SPARKLING_CHANNEL, 

TAG_SPARKLING_CLASSIFICATION, TAG_CLASS}, new int[] 
        { R.id.outlet_name, R.id.sparkling_channel, R.id.sparkling_classification, 

R.id.cls_state}); 

    // I shouldn't have to comment on this one: 
    setListAdapter(adapter); 

    // Optional: when the user clicks a list item we 
    //could do something. However, we will choose 
    //to do nothing... 
    final ListView lv = getListView(); 
    lv.setOnItemClickListener(new OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> parent, View view, 
       int position, long id) { 


      HashMap<String, String>map = (HashMap<String, String>)parent.getItemAtPosition(position); 


      String foutname = map.get(TAG_OUTLET_NAME); 
      String fchannel = map.get(TAG_SPARKLING_CHANNEL); 
      String fclass = map.get(TAG_SPARKLING_CLASSIFICATION); 
      String fclass_state = map.get(TAG_CLASS); 



      Intent i = new Intent(OutletsList.this, GdgScoreSheeet.class); 
      i.putExtra("outlt", foutname); 
      i.putExtra("chnl", fchannel); 
      i.putExtra("cls", fclass); 
      i.putExtra("clsstate", fclass_state); 
      startActivity(i); 


    }); 
} 

public class LoadMathQuestions extends AsyncTask<Void, Void, Boolean> { 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     pDialog = new ProgressDialog(OutletsList.this); 
     pDialog.setMessage("Loading outlets please wait..."); 
     pDialog.setIndeterminate(false); 
     pDialog.setCancelable(true); 
     pDialog.show(); 
    } 

    @Override 
    protected Boolean doInBackground(Void... arg0) { 
     updateJSONdata(); 
     return null; 

    } 

    @Override 
    protected void onPostExecute(Boolean result) { 
     super.onPostExecute(result); 
     pDialog.dismiss(); 
     updateList(); 
    } 
} 
} 

Answer 1

Используйте этот код в качестве примера для замены, где создаются ваше Намерение:

Intent i = new Intent(); 
// Additional Extras 

if(fclass_state.equals("GOLD")){ 
    i.setClass(OutletList.this, GoldActivity.class); 
    // additional extras 
} else if(fclass_state.equals("SILVER")){ 
    i.setClass(OutletList.this, SilverActivity.class); 
    // additional extras 
} else if(fclass_state.equals("BRONZE")){ 
    i.setClass(OutletList.this, BronzeActivity.class); 
    // additional extras 
} else { 
    i.setClass(OutletList.this, UnassignedActivity.class); 
    // additional extras 
} 

Answer 2

В вашем методе OnClick:

switch(position) { 
    // first list item selected 
    case 0:  
     Intent i = new Intent(OutletsList.this, GdgScoreSheeet.class); 
     i.putExtra("outlt", foutname); 
     i.putExtra("chnl", fchannel); 
     i.putExtra("cls", fclass); 
     i.putExtra("clsstate", fclass_state); 
     startActivity(i); 
     break; 
    // second list item selected 
    case 1: 
     ... 
}