如何從解析數組中刪除字符串

Question

我目前正在使用Android的解析API，並且我目前在我的應用程序中有一個字符串數組。我目前有一個ListView與我所有的字符串。在ListView本身的應用程序內部，我實現了一個setOnItemLongClickListener，其中Dialog。我想從Parse中刪除選定的ListView項目的字符串。

Image of the Database Row

NotesFragment.java

public class NotesFragment extends Fragment { 

    ParseUser user; 
    ListView notesList; 
    private FloatingActionButton FAB; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
    } 


    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.fragment_notes, container, false); 

     notesList = (ListView) rootView.findViewById(R.id.lv_contact); 
     user = ParseUser.getCurrentUser(); 

     FAB = (FloatingActionButton) rootView.findViewById(R.id.fab); 
     FAB.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       Intent intent = new Intent(getContext(), AddNoteActivity.class); 
       getActivity().overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_left); 
       startActivity(intent); 
      } 
     }); 

     final ArrayList<ParseObject> list1 = (ArrayList) user.getList("notes"); 
     ArrayAdapter<ParseObject> arrayAdapter; 
     arrayAdapter = new ArrayAdapter<ParseObject>(getContext(), android.R.layout.simple_list_item_1, list1); 

     RelativeLayout emptyView = (RelativeLayout) rootView.findViewById(R.id.empty); 

     if (list1 == null) { 

      emptyView.setVisibility(View.VISIBLE); 


     } else { 

      notesList.setAdapter(arrayAdapter); 
      emptyView.setVisibility(View.INVISIBLE); 

     } 

     notesList.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { 

      @Override 
      public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) { 
       new AlertDialog.Builder(getContext()) 
         .setTitle("Are you sure you want to Delete?") 
         .setPositiveButton("Yes", new DialogInterface.OnClickListener() { 
          public void onClick(DialogInterface dialog, int whichButton) { 

           ArrayList<String> toRemove = new ArrayList<>(); 
           toRemove.add("Hey"); 
           ParseUser.getCurrentUser().removeAll("checklistDat", toRemove); 
           ParseUser.getCurrentUser().saveInBackground(); 
           ParseUser.getCurrentUser().deleteInBackground(); 

          } 
         }) 


         .setNegativeButton("No", new DialogInterface.OnClickListener() { 
          public void onClick(DialogInterface dialog, int whichButton) { 


          } 
         }) 
         .show(); 
       return true; 
      } 
     }); 

     return rootView; 
    } 

} 

Answer 1

我能夠這樣做

NotesFragment.java

public class NotesFragment extends Fragment { 

    ParseUser user; 
    ListView notesList; 
    ProgressBar mPB; 
    private FloatingActionButton FAB; 
    ArrayList<ParseObject> list1 = (ArrayList) ParseUser.getCurrentUser().getList("notes"); 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.fragment_notes, container, false); 

     mPB = (ProgressBar) rootView.findViewById(R.id.progress_bar); 

     mPB.setVisibility(View.VISIBLE); 

     new Handler().postDelayed(new Runnable() { 

      @Override 
      public void run() { 
       mPB.setVisibility(View.GONE); 
      } 

     }, 3500); 

     notesList = (ListView) rootView.findViewById(R.id.lv_contact); 
     user = ParseUser.getCurrentUser(); 

     FAB = (FloatingActionButton) rootView.findViewById(R.id.fab); 
     FAB.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       Intent intent = new Intent(getContext(), AddNoteActivity.class); 
       getActivity().overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_left); 
       startActivity(intent); 
      } 
     }); 


     final ArrayAdapter<ParseObject> arrayAdapter; 
     arrayAdapter = new ArrayAdapter<ParseObject>(getContext(), android.R.layout.simple_list_item_1, list1); 

     final RelativeLayout emptyView = (RelativeLayout) rootView.findViewById(R.id.empty); 

     if (list1 == null) { 

      emptyView.setVisibility(View.VISIBLE); 
      mPB.setVisibility(View.GONE); 


     } else { 

      notesList.setAdapter(arrayAdapter); 
      emptyView.setVisibility(View.INVISIBLE); 

     } 

     notesList.setLongClickable(true); 
     notesList.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { 
      @Override 
      public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) { 
       new android.app.AlertDialog.Builder(getContext()) 
         .setTitle("Delete?") 
         .setPositiveButton("Yes", new DialogInterface.OnClickListener() { 
          public void onClick(DialogInterface dialog, int whichButton) { 
           list1.remove(position); 
           ParseUser.getCurrentUser().remove("notes"); 
           ParseUser.getCurrentUser().put("notes", list1); 
           ParseUser.getCurrentUser().saveInBackground(new SaveCallback() { 
            @Override 
            public void done(ParseException e) { 

             Toast.makeText(getContext(), "Deleted", Toast.LENGTH_SHORT).show(); 


             if (list1.toString().equals("[]")) { 

              emptyView.setVisibility(View.VISIBLE); 
              mPB.setVisibility(View.GONE); 


             } else { 

              notesList.setAdapter(arrayAdapter); 
              emptyView.setVisibility(View.INVISIBLE); 

             } 

            } 
           }); 
          } 
         }) 


         .setNegativeButton("No", new DialogInterface.OnClickListener() { 
          public void onClick(DialogInterface dialog, int whichButton) { 

          } 
         }) 
         .show(); 
       return true; 
      } 
     }); 

     return rootView; 
    } 
}