將嵌套類移動到外部文件

Question

在我的主要活動文件中，我有兩個類要移出到新文件（僅用於清理代碼）。這兩個班級分別是AdapterForPostsListView和PostFilter。我嘗試使用Eclipse的「Refractor」 - >「將類型移動到新文件」，但由於在主/父活動中定義了一些變量，因此它會生成錯誤。

public class Amawal extends SherlockActivity { 

    // Declare Variables 
    ListView list; 
    EditText editsearch; 
    private List<Post> wp_posts = null; 
    private AdapterForPostsListView dataAdapter = null; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.home_activity); 

     // Initialise DB; copy it from assets to system if not already done. 
     AmawalDB db = new AmawalDB(this, null, 1); 
     db.initialise(); 

     wp_posts = db.getAllPosts(); 

     populateListView(); 
     registerClickCallback(); 
    } 

    private void populateListView() { 
     // create an ArrayAdaptar from the Posts object 
     dataAdapter = new AdapterForPostsListView(this, R.layout.item_view, wp_posts); 
     ListView list = (ListView) findViewById(R.id.posts_container_listview); 

     // Assign adapter to ListView 
     list.setAdapter(dataAdapter); 

     // enables filtering for the contents of the given ListView 
     list.setTextFilterEnabled(true); 

    } 

    /* 
    * http://www.mysamplecode.com/2012/07/android-listview-custom-layout-filter. 
    * html 
    */ 
    private class AdapterForPostsListView extends ArrayAdapter<Post> { 

     private ArrayList<Post> originalList; 
     private ArrayList<Post> newList; 
     private PostFilter filter; 

     public AdapterForPostsListView(Context context, int textViewResourceId, List<Post> countryList) { 
      super(context, textViewResourceId, countryList); 
      this.newList = new ArrayList<Post>(); 
      this.newList.addAll(countryList); 
      this.originalList = new ArrayList<Post>(); 
      this.originalList.addAll(countryList); 
     } 

     @Override 
     public Filter getFilter() { 
      if (filter == null) { 
       filter = new PostFilter(); 
      } 
      return filter; 
     } 

     private class ViewHolder { 
      TextView holder_post_title; 
      TextView holder_post_content; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 

      ViewHolder holder = null; 
      Log.v("ConvertView", String.valueOf(position)); 
      if (convertView == null) { 

       LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
       convertView = vi.inflate(R.layout.item_view, null); 

       holder = new ViewHolder(); 
       holder.holder_post_title = (TextView) convertView.findViewById(R.id.item_postTitle); 
       holder.holder_post_content = (TextView) convertView.findViewById(R.id.item_postContent); 

       convertView.setTag(holder); 

      } else { 
       holder = (ViewHolder) convertView.getTag(); 
      } 

      Post post = newList.get(position); 
      holder.holder_post_title.setText(post.getpostTitle()); 
      holder.holder_post_content.setText(post.getPostContent()); 

      return convertView; 

     } 

     private class PostFilter extends Filter { 

      @Override 
      protected FilterResults performFiltering(CharSequence constraint) { 

       constraint = constraint.toString().toLowerCase(Locale.getDefault()); 
       FilterResults result = new FilterResults(); 
       if (constraint != null && constraint.toString().length() > 0) { 
        ArrayList<Post> filteredItems = new ArrayList<Post>(); 

        for (int i = 0, l = originalList.size(); i < l; i++) { 
         Post post = originalList.get(i); 
         if (post.toString().toLowerCase(Locale.getDefault()).contains(constraint)) 
          filteredItems.add(post); 
        } 
        result.count = filteredItems.size(); 
        result.values = filteredItems; 
       } else { 
        synchronized (this) { 
         result.values = originalList; 
         result.count = originalList.size(); 
        } 
       } 
       return result; 
      } 

      @SuppressWarnings("unchecked") 
      @Override 
      protected void publishResults(CharSequence constraint, FilterResults results) { 

       newList = (ArrayList<Post>) results.values; 
       notifyDataSetChanged(); 
       clear(); 
       for (int i = 0, l = newList.size(); i < l; i++) 
        add(newList.get(i)); 
       notifyDataSetInvalidated(); 
      } 
     } 
    } 

    private void registerClickCallback() { 
     ListView list = (ListView) findViewById(R.id.posts_container_listview); 
     list.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View viewClicked, int position, long id) { 

       Post clickedPost = wp_posts.get(position); 

       // New intent 
       Intent i = new Intent(Amawal.this, SinglePost.class); 

       int ID = clickedPost.getID(); 

       String message = "You clicked position " + position + " Which is ID " + ID; 
       Toast.makeText(Amawal.this, message, Toast.LENGTH_LONG).show(); 

       // supply a Tag 
       i.putExtra("ID", ID); 

       // launch activity 
       startActivity(i); 
      } 
     }); 
    } 

    // Create the options menu 
    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Get the options menu view from menu.xml in menu folder 
     getSupportMenuInflater().inflate(R.menu.menu, menu); 

     // Locate the EditText in menu.xml 
     editsearch = (EditText) menu.findItem(R.id.menu_search).getActionView(); 

     // Listen to search text change 
     editsearch.addTextChangedListener(new TextWatcher() { 

      @Override 
      public void afterTextChanged(Editable s) { 
       String text = editsearch.getText().toString().toLowerCase(Locale.getDefault()); 

       dataAdapter.getFilter().filter(text); 
      } 

      @Override 
      public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { 

      } 

      @Override 
      public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { 

      } 

     }); 

     // Show the search menu item in menu.xml 
     MenuItem menuSearch = menu.findItem(R.id.menu_search); 

     menuSearch.setOnActionExpandListener(new OnActionExpandListener() { 

      // Menu Action Collapse 
      @Override 
      public boolean onMenuItemActionCollapse(MenuItem item) { 
       // Empty EditText to remove text filtering 
       editsearch.setText(""); 
       editsearch.clearFocus(); 
       return true; 
      } 

      // Menu Action Expand 
      @Override 
      public boolean onMenuItemActionExpand(MenuItem item) { 
       // Focus on EditText 
       editsearch.requestFocus(); 

       // Force the keyboard to show on EditText focus 
       InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); 
       imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0); 
       return true; 
      } 
     }); 

     // Show the about us menu item in menu.xml 
     MenuItem menuAbout = menu.findItem(R.id.menu_about); 

     // Capture the about menu click 
     menuAbout.setOnMenuItemClickListener(new OnMenuItemClickListener() { 

      @Override 
      public boolean onMenuItemClick(MenuItem item) { 
       // TODO Auto-generated method stub 
       // Open the about us activity 
       Toast.makeText(getApplicationContext(), "Nothing here!", Toast.LENGTH_LONG).show(); 
       return false; 
      } 

     }); 

     return true; 
    } 

    @Override 
    protected void onDestroy() { 
     super.onDestroy(); 
     // Close the database here 
    } 

} 

由於我是新來的Java的OOP我有獲得新創建的類問題工作:(

Answer 1

一個構造函數添加到您的移動指出，需要作爲參數，你需要的變量的類從父類存儲這些值作爲類的成員變量，它的方法可以訪問

舉例來說，如果我們假定爲簡單起見，只有originalList需要通過傳遞：

class PostFilter extends Filter { 
    private ArrayList<Post> originalList; 

    public PostFilter(ArrayList<Post> originalList) { 
     this.originalList = originalList; 
    } 
...