在Android的適配器面臨的問題，有什麼錯？

Question

今天，我突然遇到了以前從未見過的問題。幫我:)

public class ShowAnimalsListActivity extends Activity 
    { 
     ArrayList<String> animalsNameList; 
     public void onCreate(Bundle saveInstanceState) 
     { 
       super.onCreate(saveInstanceState); 
       setContentView(R.layout.animal_list); 

       // Get the reference of ListViewAnimals 
       ListView animalList=(ListView)findViewById(R.id.listViewAnimals); 


       animalsNameList = new ArrayList<String>(); 
       getAnimalNames(); 

       ArrayAdapter<String> arrayAdapter =  
       new ArrayAdapter<String>(this,android.R.layout.simple_list_item1, animalsNameList); 
       // Set The Adapter 
       animalList.setAdapter(
       animalList.setOnItemClickListener(new OnItemClickListener() 
        { 
          // argument position gives the index of item which is clicked 
          public void onItemClick(AdapterView<?> arg0, View v,int position, long arg3) 
          { 

            String selectedAnimal=animalsNameList.get(position); 
            Toast.makeText(getApplicationContext(), "Animal Selected : "+selectedAnimal, Toast.LENGTH_LONG).show(); 
           } 
        }); 
     } 

Answer 1

你應該先設置適配器，然後你寫onClickListener。

animalList.setAdapter(arrayAdapter); 

也改變

String selectedAnimal=animalsNameList.get(position); 

到

String selectedAnimal=String.ValueOf(animalsNameList.get(position));