java - 从DialogFragment调用Fragment时没有触发回调函数

Question

现在我有:-

1) 1 Activity ，这是从 AppCompactActivity 扩展的主要 Activity 。

2) 1 fragment 类，从 fragment 扩展，这是从主 Activity 调用的 fragment (1) - ProfileTeacherActivity.java

3) 1 fragment 类，从 DialogFragment 扩展，此对话框从 fragment (2) 调用 - ModalBox.java

所以，基本上，这只是一个简单的执行流程。开始时，应用程序显示主 Activity (1) 具有抽屉，其中有一些链接(例如配置文件链接)，当单击此链接时，应用程序调用 fragment (2) 通过一个编辑按钮显示配置文件的详细信息。单击编辑按钮后，应用程序将调用 DialogFragment (3)，其中包含一些用于编辑用户个人资料的 EditText。

我想要实现的是，在编辑用户的个人资料并成功保存到数据库后，我尝试将用户的数据发送回fragment (2)只是为了显示最新更新的信息，不幸的是它没有'不工作。

这是我尝试过的:

1) 在DialogFragment中创建接口(interface)(3) - ModalBox.java

public class ModalBox extends DialogFragment{

   ....
   public interface EditProfileModalBoxInterface {
     void onFinishEditProfile( HashMap<String, String> dataPassing );
   }
   ...
   ...
}

2)在DialogFragment内部我也有.setPositiveButton函数用于OK按钮。 - ModalBox.java

public class ModalBox extends DialogFragment{
   ...       
   ...
   public Dialog onCreateDialog(Bundle savedInstanceState ) {
      ...
      builder
        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(final DialogInterface dialog, int id) {
               // At here i'm using retrofit2 http library
               // to do updating stuff
               // and inside success's callback of retrofit2(asynchronous)
               // here i call the below function to send data 
               // dataToSend is a HashMap value
               sendBackResultToParent( dataTosend );
            }
        })
         .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                // User cancelled the dialog
            }
        });
      .....
   }

   // Function called inside success's callback of retrofit2
   public void sendBackResultToParent( HashMap<String, String> data ) {
      // instantiated interface
      EditProfileModalBoxInterface ls=(EditProfileModalBoxInterface)getTargetFragment();
      // declaring interface's method
      ls.onFinishEditProfile( data );
   }
}

3) 最后，我在 fragment 中实现了这些接口(interface) (2) - ProfileTeacherActivity.java

public class ProfileTeacherActivity extends Fragment 
       implements ModalBox.EditProfileModalBoxInterface{

    public View onCreateView(LayoutInflater inflater, 
                   ViewGroup container, Bundle savedInstanceState ) {
       .....
       .....
    }

    // At here the interface's method did't triggered
    @Override
    public void onFinishEditProfile( HashMap dataPassedFromDialog ) {
      Toast.makeText(getActivity(), "Testing...." , Toast.LENGTH_LONG).show();
    }

}

我现在感到困惑的是，只有当我在retrofit2 success的回调中调用这个函数sendBackResultToParent( dataTosend ); 时才会出现问题，在它之外调用时它会触发。我假设异步调用导致了这一点。如果我可以使用 Promise 或类似的东西，或者有什么解决方法吗？

以下现有解决方案在我的案例中不起作用:

• Callback to a Fragment from a DialogFragment
• How to send data from DialogFragment to a Fragment?
• Send Data from DialogFragment to Fragment

如果上述用例不够清晰或有误解，请向我询问更多信息。感谢您的帮助。问候。

Answer 1

这是一个示例 DialogFragment 代码，用于向选定的联系人发送消息。我也需要捕获 DialogFragment 上的点击事件并重定向。

理想情况下要实现这一目标，这就是需要做的事情

• 覆盖AlertDialog.Builder的正/负按钮点击并且不执行任何操作
• 在此之后，使用 getButton 方法提及 AlertDialog.BUTTON_NEGATIVE 或 AlertDialog.BUTTON_POSITIVE 并分配一个操作

<小时/>

public class SMSDialogFrag extends DialogFragment {

    private static String one="one";
    private EditText messageContent;
    private AlertDialog dialog;
    private String mobNumber;

    public static SMSDialogFrag showDialog(String mobNumber){
        SMSDialogFrag customDialogFrag=new SMSDialogFrag();
        Bundle bundle=new Bundle();
        bundle.putString(one, mobNumber);
        customDialogFrag.setArguments(bundle);
        return customDialogFrag;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
        View view = getActivity().getLayoutInflater().inflate(R.layout.sms_dialog, null);

        alertDialogBuilder.setView(view);
        setupUI(view);
        alertDialogBuilder.setTitle("");

        alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //Do nothing here because we override this button later
            }
        });
        alertDialogBuilder.setPositiveButton("Send", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //Do nothing here because we override this button later
            }
        });
        dialog = alertDialogBuilder.create();
        dialog.show();
        dialog.getButton(AlertDialog.BUTTON_NEGATIVE).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog.dismiss();
                //else dialog stays open. Make sure you have an obvious way to close the dialog especially if you set cancellable to false.
            }
        });
        dialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendMessage();//IN YOUR USE CASE YOU CAN REDIRECT TO YOUR CALLER FRAGMENT

            }
        });

        return dialog;
    }
    void setupUI(View view){
        TextView textViewMob=(TextView)view.findViewById(R.id.mobNumber);
        messageContent=(EditText)view.findViewById(R.id.messageContent);
        mobNumber=getArguments().getString(one);
        textViewMob.setText("Send message to : "+mobNumber);
    }
    void sendMessage(){
        if( ! TextUtils.isEmpty(messageContent.getText())){
            try {
                SmsManager smsManager = SmsManager.getDefault();
                Log.v(Constants.UI_LOG,"Number >>>>>>> "+mobNumber);
                smsManager.sendTextMessage(mobNumber, null, messageContent.getText().toString(), null, null);
            } catch (Exception e) {
                e.printStackTrace();
            }
            Toast.makeText(getActivity(),"Message Sent!",Toast.LENGTH_SHORT).show();
            dialog.dismiss();
        }else{
            Toast.makeText(getActivity(),"Please enter message to send!",Toast.LENGTH_SHORT).show();
        }
    }
}