Android: Force Close Erreur

Question

J'écrivais l'application Android (liste de contacts simples) selon le didacticiel vidéo O'Really. Mais j'ai été arrêté avec une erreur irritante, que je ne suis pas capable de gérer moi-même. S'il vous plaît aider.

Texte de l'erreur dans l'émulateur Android:

The application ContactList (process my.contactlist) had stopped unexpectedly. Please, try again 

Après le débogage j'ai trouvé que le problème se produit dans ContactAdapter à la ligne

ci = (ContactItem) View.inflate(context, R.layout.contact_item, null); 

Le dit LogCat:

12-19 12:19:30.727: ERROR/AndroidRuntime(522): FATAL EXCEPTION: main 
     java.lang.ClassCastException: android.widget.LinearLayout 
     at my.contactlist.ContactAdapter.getView(ContactAdapter.java:45) 
     at android.widget.AbsListView.obtainView(AbsListView.java:1430) 
     at android.widget.ListView.makeAndAddView(ListView.java:1745) 
     at android.widget.ListView.fillDown(ListView.java:670) 
     at android.widget.ListView.fillFromTop(ListView.java:727) 
     at android.widget.ListView.layoutChildren(ListView.java:1598) 
     at android.widget.AbsListView.onLayout(AbsListView.java:1260) 
     at android.view.View.layout(View.java:7175) 
     at android.widget.RelativeLayout.onLayout(RelativeLayout.java:912) 
     at android.view.View.layout(View.java:7175) 
     at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 
     at android.view.View.layout(View.java:7175) 
     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1254) 
     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1130) 
     at android.widget.LinearLayout.onLayout(LinearLayout.java:1047) 
     at android.view.View.layout(View.java:7175) 
     at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 
     at android.view.View.layout(View.java:7175) 
     at android.view.ViewRoot.performTraversals(ViewRoot.java:1140) 
     at android.view.ViewRoot.handleMessage(ViewRoot.java:1859) 
     at android.os.Handler.dispatchMessage(Handler.java:99) 
     at android.os.Looper.loop(Looper.java:123) 
     at android.app.ActivityThread.main(ActivityThread.java:3683) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:507) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
     at dalvik.system.NativeStart.main(Native Method) 

Code des classes principales et dispositions:

public class MainActivity extends ListActivity { 

    private ContactApp app; 
    private ContactAdapter adapter; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.main); 
     setUpViews(); 
     app = (ContactApp) getApplication(); 
     app.getContacts().add(new Contact("AAA", "BBB", "CCC")); 
     adapter = new ContactAdapter(this, app.getContacts()); 
     setListAdapter(adapter); 
     Toast.makeText(this, "count="+adapter.getCount(), Toast.LENGTH_SHORT).show(); 
    } 

    private void setUpViews() { 
     Button addButton = (Button) findViewById(R.id.newContact); 
     addButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Intent intent = new Intent(MainActivity.this, AddContactActivity.class); 
       startActivity(intent); 


       } 
      }); 
     } 

     @Override 
     protected void onResume() { 
      super.onResume(); 
      // adapter.notifyDataSetChanged(); 
     } 
    } 

ContactAdapter.java:

public class ContactAdapter extends BaseAdapter { 

    private ArrayList<Contact> contacts; 
    private Context context; 

    public ContactAdapter(Context context, ArrayList<Contact> contacts) { 
     super(); 
     this.contacts = contacts; 
     this.context = context; 
    } 

    @Override 
    public int getCount() { 
     return contacts.size(); 
    } 

    @Override 
    public Contact getItem(int i) { 
     return (contacts == null) ? null : contacts.get(i); 
    } 

    @Override 
    public long getItemId(int i) { 
     return i; 
    } 

    @Override 
    public View getView(int i, View view, ViewGroup viewGroup) { 
     ContactItem ci; 
     if (view == null) { 
      ci = (ContactItem) View.inflate(context, R.layout.contact_item, null); 
     } else { 
      ci = (ContactItem)view; 
     } 

     ci.setContact(contacts.get(i)); 
     return ci; 
    } 

    public void forceReload() { 
     notifyDataSetChanged(); 
    } 
} 

Contact.java:

public class Contact { 

    private String lastname; 
    private String name; 
    private String phoneNumber; 

    public Contact(String lastname, String name, String phoneNumber) { 
     this.lastname = lastname; 
     this.name = name; 
     this.phoneNumber = phoneNumber; 
    } 


    public String getLastname() { 
     return lastname; 
    } 

    public String getName() { 
     return name; 
    } 

    public String getPhoneNumber() { 
     return phoneNumber; 
    } 

    public void setLastname(String lastname) { 
     this.lastname = lastname; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public void setPhoneNumber(String phoneNumber) { 
     this.phoneNumber = phoneNumber; 
    } 
} 

contact_item.xml

<?xml version="1.0" encoding="utf-8"?> 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
       android:layout_width="fill_parent" 
       android:layout_height="fill_parent" 
       android:orientation="horizontal"> 

    <ImageView 
      android:id="@+id/img" 
      android:src="@drawable/person" 
      android:layout_width="24px" 
      android:layout_height="24px" 
      android:layout_marginLeft="2px" 
      android:layout_marginRight="5px" 
      android:layout_marginTop="5px" 
      /> 

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" 
        android:orientation="vertical"> 
     <TextView 
       android:id="@+id/show_name" 
       android:layout_height="wrap_content" 
       android:layout_width="fill_parent" 
       android:textSize="12px" 
       android:textColor="#AAAAFF" 

       /> 
     <TextView 
       android:id="@+id/show_phone" 
       android:layout_height="wrap_content" 
       android:layout_width="fill_parent" 
       android:textSize="12px" 
       android:textColor="#AAAAFF" 


       /> 
    </LinearLayout> 

</LinearLayout> 

ContactItem.java

public class ContactItem extends LinearLayout { 

    // private Contact contact; 
    private TextView name; 
    private TextView phone; 


    public ContactItem(Context context, AttributeSet attrs) { 
     super(context, attrs); 
    } 

    @Override 
    protected void onFinishInflate() { 
     super.onFinishInflate();  
     name = (TextView) findViewById(R.id.show_name); 
     phone = (TextView) findViewById(R.id.show_phone); 
    } 

    public void setContact(Contact contact) { 
     //this.contact = contact; 
     name.setText(contact.getLastname());//+" "+contact.getName()); 
     phone.setText(contact.getPhoneNumber()); 
    } 
} 

Des suggestions?

Answer 1

La mise en page que vous gonflez est une LinearLayout. Vous ne pouvez pas convertir un LinearLayout en ContactItem, mais vous pouvez convertir un objet ContactItem en un LinearLayout. Puisque vous avez défini ContactItem, pourquoi ne modifiez-vous pas la racine de votre présentation en ContactItem?