Question

我无法弄清楚为什么按下硬件后退按钮（或对话框的OK按钮）有时不会将我返回到初始的DialogFragment。

我有一个DeductionListDialog片段，可以从MainActivity的选项菜单中调用：

    public boolean onOptionsItemSelected(MenuItem item) {
    ...
    case R.id.action_deduction_list:
        DialogFragment newFragment = new DeductionListDialog();
        newFragment.show(getFragmentManager(), "dialog");
        return true;
    default:
        return super.onOptionsItemSelected(item);
    }

DeductionListDialog在其onCreateDialog方法中有几个onClickListener：

        // the listview that holds the deduction list
    ListView listview = (ListView) view.findViewById(android.R.id.list);
    listview.setOnItemClickListener(new OnItemClickListener() {

        @Override
        // set a short click listener
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            // create a new dialog fragment
            DialogFragment deduction_specifics = new DeductionSpecificsDialog();

            // / bundle database row so we can get the correct info
            // for our specific listing
            Bundle arguments = new Bundle();
            arguments.putLong("database_row", id);
            deduction_specifics.setArguments(arguments);
            deduction_specifics.show(getFragmentManager(), "dialog");
        }
    });
    // set the long click listener
    listview.setOnItemLongClickListener(new OnItemLongClickListener() {

        // on long click we want to open the edit fragment
        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
            DialogFragment deduction_edit = new DeductionEditFragment();
            Bundle arguments = new Bundle();
            arguments.putLong("database_id", id);
            deduction_edit.setArguments(arguments);
            deduction_edit.show(getFragmentManager(), "dialog");
            /*Intent deduction_edit_intent = new Intent(getActivity(), DeductionEditActivity.class);
            deduction_edit_intent.putExtra("database_id", id);
            startActivity(deduction_edit_intent);*/
            return true;
        }
    });

当listview onItemClick＆amp;单击onItemLongClick侦听器，弹出另一个包含各种信息的对话框。当我按下后退按钮或对话框的OK按钮时，我按预期返回到初始的DeductionListDialog片段。

DeductionListDialog也在其onCreateDialog方法中：

        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
...
        alertDialogBuilder.setView(view);
    alertDialogBuilder.setTitle("Deductions: ");
    alertDialogBuilder.setMessage("Long press to update or delete");
    alertDialogBuilder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
               // User clicked OK button
               dialog.dismiss();
           }
       });
    alertDialogBuilder.setNegativeButton("Add", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
               // User clicked Add button
                DialogFragment deduction_edit = new DeductionEditFragment();
                Bundle arguments = new Bundle();
                deduction_edit.setArguments(arguments);
                deduction_edit.show(getFragmentManager(), "dialog");

               /*Intent deduction = new Intent(getActivity(), DeductionEditActivity.class);
               startActivity(deduction);*/
           }
       });

当我单击“添加”按钮时，会创建一个新的DeductionEditFragment。当我单击后退（或对话框的取消和接受按钮）时，我希望视图返回到原始的DeductionListDialog片段，但点击只会导致片段关闭回MainActivity。

1）为什么会这样，因为我想学习将来如何防止这种情况发生 2）解决这个问题的最快方法是什么？ 3）如果与＃2不同，解决这个问题的“正确”方法是什么？

可以在此处找到整个三个类（DeductionListDialog，DeductionEditDialog，DeductionSpecificsDialog）的pastebin：http://pastebin.com/AJQ6KCEN
谢谢大家。

DialogFragment后退按钮关闭主要活动

0 个答案: