Android：从AlertDialog传递一个变量onClick

Question

我想在用户点击AlertDialog中的“OK”时将变量传递给外部函数。 我正在尝试这个例子，但它不会识别变量（YUP）。

public final void deleteBookmark(Cursor cur, int pos) { 

     //fetching info 
     ((Cursor) cur).moveToPosition(pos); 
     String bookmark_id = ((Cursor) cur).getString(((Cursor) cur).getColumnIndex(Browser.BookmarkColumns._ID)); 
     String bookmark_title = ((Cursor) cur).getString(((Cursor) cur).getColumnIndex(Browser.BookmarkColumns.TITLE)); 

     //asking user to approve delete request 
     AlertDialog alertDialog = new AlertDialog.Builder(Dmarks.this).create(); 
     alertDialog.setTitle("Delete" + " " + bookmark_title); 
     alertDialog.setIcon(R.drawable.icon); 
     alertDialog.setMessage("Are you sure you want to delete this Bookmark?"); 
     alertDialog.setButton("OK", new DialogInterface.OnClickListener() { 
       public void onClick(DialogInterface dialog, int which) { 
       **String Yup = "yes";** 
      } }); 
     alertDialog.setButton2("Cancel", new DialogInterface.OnClickListener() { 
       public void onClick(DialogInterface dialog, int which) { 
        Context context = getApplicationContext(); 
        Toast.makeText(context, "canceled" , Toast.LENGTH_SHORT).show(); 
      } }); 
     alertDialog.show(); 

     **if (Yup == "yes")** { 
     //deleting if user approved 
     getContentResolver().delete(Browser.BOOKMARKS_URI, "_id = " + bookmark_id, null); 

     //notifying user for deletion 
     Context context = getApplicationContext(); 
     Toast.makeText(context, bookmark_title + " " + "deleted" , Toast.LENGTH_SHORT).show(); 
     } 
    } 

我知道代码有点搞砸了，但它只是为了理解。

感谢帮助！

Answer 1

由于您在onClick方法中创建了字符串，并且在onClick完成时它被回收，因此Yup无法识别。

我建议刚刚摆脱YUP，因为即使你解决这个问题，你也会遇到问题。该对话框将弹出，但在用户选择时，应用程序将已经通过if语句，所以Yup从未有机会等于“是”。换句话说，对话框不会暂停你的代码，并在通过“if（Yup ==”yes“）之前等待用户输入。此外，if语句应如下所示：if (Yup.equals("yes"))，否则它将返回。假每次

我会让你的代码看起来是这样的：

public final void deleteBookmark(Cursor cur, int pos) { 

    //fetching info 
    ((Cursor) cur).moveToPosition(pos); 
    final String bookmark_id = ((Cursor) cur).getString(((Cursor) cur).getColumnIndex(Browser.BookmarkColumns._ID)); 
    final String bookmark_title = ((Cursor) cur).getString(((Cursor) cur).getColumnIndex(Browser.BookmarkColumns.TITLE)); 

    //asking user to approve delete request 
    AlertDialog alertDialog = new AlertDialog.Builder(Dmarks.this).create(); 
    alertDialog.setTitle("Delete" + " " + bookmark_title); 
    alertDialog.setIcon(R.drawable.icon); 
    alertDialog.setMessage("Are you sure you want to delete this Bookmark?"); 
    alertDialog.setButton("OK", new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int which) { 
      //deleting if user approved 
      getContentResolver().delete(Browser.BOOKMARKS_URI, "_id = " + bookmark_id, null); 

      //notifying user for deletion 
      Context context = getApplicationContext(); 
      Toast.makeText(context, bookmark_title + " " + "deleted" , Toast.LENGTH_SHORT).show(); 
      } }); 
    alertDialog.setButton2("Cancel", new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int which) { 
       Context context = getApplicationContext(); 
       Toast.makeText(context, "canceled" , Toast.LENGTH_SHORT).show(); 
     } }); 
    alertDialog.show(); 
    } 
}