Wie öffne ich einen Dialog, um das Löschen zu bestätigen, wenn der Benutzer lange auf das Listenelement drückt?

Question

Ich lerne von einem Online-Tutorial, und ich versuche, eine Funktion von mir selbst zu implementieren. Wie kann ich einen Dialog öffnen, um den Benutzer zu warnen, wenn ein langer Druck auf das Listenelement erkannt wird? Nachfolgend finden Sie einige Code aus diesem Tutorial:

public class FriendList extends ListActivity 
{ 


private static final int ADD_NEW_FRIEND_ID = Menu.FIRST; 

private static final int EXIT_APP_ID = Menu.FIRST + 1; 
private IAppManager imService = null; 
private FriendListAdapter friendAdapter; 

public String ownusername = new String(); 

private class FriendListAdapter extends BaseAdapter 
{  
    class ViewHolder { 
     TextView text; 
     ImageView icon; 
    } 
    private LayoutInflater mInflater; 
    private Bitmap mOnlineIcon; 
    private Bitmap mOfflineIcon;   

    private FriendInfo[] friends = null; 


    public FriendListAdapter(Context context) { // Constructor of Class "FriendListAdapter" 
     super();    

     mInflater = LayoutInflater.from(context); 

     mOnlineIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.greenstar); 
     mOfflineIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.redstar); 

    } 

    public void setFriendList(FriendInfo[] friends) 
    { 
     this.friends = friends; 
    } 


    public int getCount() { // get how many row are in the listview 

     return friends.length; 
    } 


    public FriendInfo getItem(int position) { // get item from the row 

     return friends[position]; 
    } 

    public long getItemId(int position) { 

     return 0; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { // For modify the content of row 
     // A ViewHolder keeps references to children views to avoid unneccessary calls 
     // to findViewById() on each row. 
     ViewHolder holder; 

     // When convertView is not null, we can reuse it directly, there is no need 
     // to reinflate it. We only inflate a new View when the convertView supplied 
     // by ListView is null. 
     if (convertView == null) 
     { 
      convertView = mInflater.inflate(R.layout.friend_list_screen, null); 

      // Creates a ViewHolder and store references to the two children views 
      // we want to bind data to. 
      holder = new ViewHolder(); 
      holder.text = (TextView) convertView.findViewById(R.id.text); 
      holder.icon = (ImageView) convertView.findViewById(R.id.icon);          

      convertView.setTag(holder); 
     } 
     else { 
      // Get the ViewHolder back to get fast access to the TextView 
      // and the ImageView. 
      holder = (ViewHolder) convertView.getTag(); 
     } 

     // Bind the data efficiently with the holder. 
     holder.text.setText(friends[position].userName); 
     holder.icon.setImageBitmap(friends[position].status == STATUS.ONLINE ? mOnlineIcon : mOfflineIcon); 

     return convertView; 
    } 

} 

Answer 1

den Code verwenden, wie:

this.getListView().setLongClickable(true); 
this.getListView().setOnItemLongClickListener(new OnItemLongClickListener() { 
public boolean onItemLongClick(AdapterView<?> parent, View v, int position, long id) { 
    //Do your tasks here 


      AlertDialog.Builder alert = new AlertDialog.Builder(
        Activity.this); 
      alert.setTitle("Alert!!"); 
      alert.setMessage("Are you sure to delete record"); 
      alert.setPositiveButton("YES", new OnClickListener() { 

       @Override 
       public void onClick(DialogInterface dialog, int which) { 
               //do your work here      
        dialog.dismiss(); 

       } 
      }); 
      alert.setNegativeButton("NO", new OnClickListener() { 

       @Override 
       public void onClick(DialogInterface dialog, int which) { 

        dialog.dismiss(); 
       } 
      }); 

      alert.show(); 

    return true; 
    } 
    }); 

Sie Alarm Dialog anpassen können nach Ihrem Bedarf ...

Answer 2

es Hopes Hilfe:

oder

final MyDialog rDialog=new MyDialog(this,this); 
     return false; 
    } 

}); 

public void Dialog() { 

    AlertDialog.Builder dialogAlert = new AlertDialog.Builder(getApplicationContext()); 
    dialogAlert.setTitle("Demo ?"); 

    dialogAlert.show(); 
} 

//Another way 

public class MyDialog extends Dialog { 

Activity act; 
public ReminderSettingDialog(Context context,Activity act) { 
super(context); 
this.act=act; 
// TODO Auto-generated constructor stub 
} 

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

} 
} 

Answer 3

Sie sollten in Ihrer Aktivität mit ListView tun.

ListView myListView; 
myListView = (ListView) findViewById(R.id.my_list_view); 

myListView.setOnLongClickListener(new OnLongClickListener() { 

    @Override 
    public boolean onLongClick(View v) { 
     //show your dialog 
     //like this 
     CustomDialog dialog = new CustomDialog(); 
     dialog.show(getSupportFragmentManager(), TAG) 
     return false; 
    } 
});