请帮我建立了一个上下文菜单在AlertDialog [英] Please help me set up a Context Menu in an AlertDialog

问题描述

我已经在这工作了一整天，我真的很接近，但就是无法得到这个工作。我有一个按钮，拉起填充保存的条目，包括名称和价格的AlertDialog。现在，我可以单击该对话框中的项目，并把它在我的活动名称和价格字段自动填写。我希望也能长preSS一个项目，并收到一个选项，将其删除。这是我第一次尝试在一个Android应用程序，和很多这是从记事本教程改变用途。有两件事情我想不通：

1）是我registerForContextMenu足够/正确吗？

2）什么是我与我的错onCreateContextMenu做？

感谢。

  savedItems.setOnClickListener（新View.OnClickListener（）{
     公共无效的onClick（视图v）{      cDbHelper.open（）;
      mNotesCursor = cDbHelper.fetchAllSaved（）;
            startManagingCursor（mNotesCursor）;            //创建名称的数组和相应的价格从分贝
            的String [] =由新的String [] {Sa​​vedItemsDbAdapter.KEY_NAME，SavedItemsDbAdapter.KEY_PRICE};            //和字段的数组我们要绑定这些字段
            INT []为= INT新[] {R.id.text1，R.id.text2};            //现在创建一个简单的游标适配器，并将其设置为显示
            SimpleCursorAdapter保存=
                 新SimpleCursorAdapter（NewEntry.this，R.layout.saved_row，mNotesCursor，从，到）;      //建立一个AlertDialog来保存这个名单
            AlertDialog.Builder建设者=新AlertDialog.Builder（NewEntry.this）;
      builder.setTitle（从列表中选择）;
      //这是足以注册上下文菜单？
      registerForContextMenu（五）;
      builder.setAdapter（保存，新DialogInterface.OnClickListener（）{       //当单击从列表中的项目，它会自动填充在活动的名称和价格领域
       @覆盖
       公共无效的onClick（DialogInterface对话，诠释项）{
 光标C = mNotesCursor;
       c.moveToPosition（项目）;
 意图I =新意图（NewEntry.this，NewEntry.class）;
       i.putExtra（名，c.getString（
         c.getColumnIndexOrThrow（SavedItemsDbAdapter.KEY_NAME）））;
       i.putExtra（价格，c.getString（
         c.getColumnIndexOrThrow（SavedItemsDbAdapter.KEY_PRICE）））;
       startActivityForResult（ⅰ，ACTIVITY_AUTO）;
       完（）;
}      //尝试和失败设置的上下文菜单 - 我们的目标是能够长期preSS，
      //有一个删除？选项​​弹出，这将删除该条目点击时
      @覆盖
      公共无效onCreateContextMenu（文本菜单菜单视图V，
    ContextMenuInfo menuInfo）{
    super.onCreateContextMenu（菜单，V，menuInfo）;
    menu.add（0，DELETE_ID，0，R.string.menu_delete）;
   }   公共布尔onContextItemSelected（菜单项项）{    开关（item.getItemId（））{
       案例DELETE_ID：
        AdapterContextMenuInfo信息=（AdapterContextMenuInfo）item.getMenuInfo（）;
        mDbHelper.deleteItem（info.id）;
        返回true;
    }
    返回false;
   }
      }）;      AlertDialog警报= builder.create（）;         alert.show（）;        }     }）;    }
 

解决方案

  

是我registerForContextMenu足够/正确吗？

您正在注册的任何上下文菜单 savedItems 是。如果这是你想要的上下文菜单中，那么一切都OK。

如果你的目标是对在该对话框中的列表中的项目的上下文菜单，你的做法是错误的。您将无法使用 AlertDialog.Builder 。您将需要创建 AlertDialog 自定义子类，因此您可以覆盖 onCreateContextMenu（）那里。

I've been working at this all day, and I'm really close but just can't get this to work. I have a button that pulls up an AlertDialog populated with saved entries that include Name and Price. Right now, I can click an item in the Dialog and have it automatically fill in the Name and Price fields in my activity. I want to also be able to long press an item and receive an option to delete it. This is my first try at an Android app, and a lot of this is repurposed from the Notepad Tutorial. Two things I can't figure out:

1) Is my registerForContextMenu sufficient/correct?

2) What am I doing wrong with my onCreateContextMenu?

Thanks.

savedItems.setOnClickListener(new View.OnClickListener() {
     public void onClick(View v) {

      cDbHelper.open();
      mNotesCursor = cDbHelper.fetchAllSaved();
            startManagingCursor(mNotesCursor);

            // Create an array of names and corresponding prices from db
            String[] from = new String[]{SavedItemsDbAdapter.KEY_NAME, SavedItemsDbAdapter.KEY_PRICE};

            // and an array of the fields we want to bind those fields to
            int[] to = new int[]{R.id.text1, R.id.text2};

            // Now create a simple cursor adapter and set it to display
            SimpleCursorAdapter saved = 
                 new SimpleCursorAdapter(NewEntry.this, R.layout.saved_row, mNotesCursor, from, to);

      // Build an AlertDialog to hold this list
            AlertDialog.Builder builder = new AlertDialog.Builder(NewEntry.this);
      builder.setTitle("Choose from list");
      // IS THIS SUFFICIENT TO REGISTER FOR CONTEXT MENU?
      registerForContextMenu(v);
      builder.setAdapter(saved, new DialogInterface.OnClickListener() {

       // When an item from the list is clicked, it automatically populates the name and price fields in activity
       @Override
       public void onClick(DialogInterface dialog, int item) {
 Cursor c = mNotesCursor;
       c.moveToPosition(item);
 Intent i = new Intent(NewEntry.this, NewEntry.class);
       i.putExtra("name", c.getString( 
         c.getColumnIndexOrThrow(SavedItemsDbAdapter.KEY_NAME)));
       i.putExtra("price", c.getString(
         c.getColumnIndexOrThrow(SavedItemsDbAdapter.KEY_PRICE)));
       startActivityForResult(i, ACTIVITY_AUTO);
       finish();
}

      // TRYING AND FAILING TO SET UP A CONTEXT MENU - the goal is to be able to long press, 
      // have a "Delete?" option pop up, which will delete the entry when clicked 
      @Override
      public void onCreateContextMenu(ContextMenu menu, View v,
    ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    menu.add(0, DELETE_ID, 0, R.string.menu_delete);
   }

   public boolean onContextItemSelected(MenuItem item) {

    switch(item.getItemId()) {
       case DELETE_ID:
        AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
        mDbHelper.deleteItem(info.id);
        return true;
    }
    return false;
   }
      });

      AlertDialog alert = builder.create();

         alert.show();

        }

     });

    }

解决方案

Is my registerForContextMenu sufficient/correct?

You are registering a context menu for whatever savedItems is. If that is what you want the context menu on, then you are OK.

If your goal is to have a context menu on the items in the list in the dialog, your approach is wrong. You will not be able to use AlertDialog.Builder. You will need to create a custom subclass of AlertDialog, so you can override onCreateContextMenu() there.

这篇关于请帮我建立了一个上下文菜单在AlertDialog的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！