請幫我在AlertDialog中設置一個上下文菜單

Question

我一直在這一整天工作，而且我非常接近，但無法實現這個目標。我有一個按鈕，可以打開一個AlertDialog，其中包含名稱和價格的保存條目。現在，我可以點擊對話框中的一個項目，並自動填寫我的活動中的名稱和價格字段。我想也能夠長時間按一個項目並收到刪除它的選項。這是我第一次嘗試使用Android應用程序，其中很多內容都是從記事本教程中重新使用的。我弄不明白兩件事：

1）我的registerForContextMenu是否足夠/正確？

2）我在做什麼錯我的onCreateContextMenu？

謝謝。

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(); 

     } 

    }); 

    } 

Answer 1

是我registerForContextMenu足夠/正確嗎？

您正在註冊任何savedItems的上下文菜單。如果這是你想要的上下文菜單，那麼你沒事。

如果您的目標是在對話框的列表中的項目上有上下文菜單，那麼您的方法是錯誤的。您將無法使用AlertDialog.Builder。您需要創建一個AlertDialog的自定義子類，以便您可以在那裏覆蓋onCreateContextMenu()。

Answer 2

我才發現我的子類AlertDialog

@Override 
public boolean onMenuItemSelected(int featureId, MenuItem item) { 

被調用，而不是

@Override 
public boolean onContextItemSelected(MenuItem item) { 

：

public class MyAlertDialog extends AlertDialog implements 
OnCreateContextMenuListener { 

也許這是別人爲我有用相當肯定你在此期間解決了你的問題。

Answer 3

您只需要實現以下功能。它會工作。

@Override 
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) 
{ 
    Log.e(LOGTAG, "Tao menu"); 
    if(v == expList) 
    { 
     super.onCreateContextMenu(menu, v, menuInfo); 
     //AdapterContextMenuInfo aInfo = (AdapterContextMenuInfo) menuInfo; 

     // We know that each row in the adapter is a Map 
     //HashMap map = (HashMap) simpleAdpt.getItem(aInfo.position); 
     menu.setHeaderTitle("Options"); 
     menu.add(1, 1, 1, "Reprint"); 
     menu.add(1, 2, 1, "Void"); 

     menu.getItem(0).setOnMenuItemClickListener(new OnMenuItemClickListener() 
     { 
      public boolean onMenuItemClick(MenuItem clickedItem) 
      { 
       return true; 
      } 
     }); 

     menu.getItem(1).setOnMenuItemClickListener(new OnMenuItemClickListener() 
     { 
      public boolean onMenuItemClick(MenuItem clickedItem) 
      { 
       return true; 
      } 
     }); 
    } 
}