如何将按钮连接到对话框，该对话框将使用用户输入在FrameLayout中编辑TextView? [英] How do I connect a button to a Dialog that will edit a TextView, within a FrameLayout, with a users input?

问题描述

我根本不了解DialogFragment.如何创建一个，如何从中获得用户输入，然后将其设置为TextView.

I don't understand DialogFragment at all. How to create one, how to get the user input out of it, and set it into a TextView.

单击TITLE按钮时，我想弹出一个DialogFragment，要求用户输入情绪板的标题.用户输入标题.当他们单击PostiveButton的完成"时，用户的标题设置在情绪面板的左上方，该面板具有带提示的TextView.

I would like for the TITLE button, when clicked, to bring up a DialogFragment asking the user to enter the title of their Mood Board. The user enters a title. When they click the PostiveButton "Done", the user's title is set into the top left frame of the mood board, which has a TextView with a hint.

请！提出问题，因为我不太了解对话框的设置.

Please! Ask questions, because I don't really understand the dialog setup.

这是我的MainActivity中的main_layout的图片.每个元素都有一个"@ + id/".

Here is a picture of my main_layout, in my MainActivity. Every element has an "@+id/".

推荐答案

您正在寻找的解决方案是回调:

The solution you are looking for is a callback:

1. 使用用作回调的方法创建接口
2. 在活动上实现界面
3. 创建对话框片段，然后在onAttach中获取界面
4. 在活动中显示对话框片段
5. 关闭对话框片段时，使用接口实例传递文本

interface Callback {
    updateText(String text)
}

class CoolActivity... implements Callback

onCreate {
    //find your views
    showDialogBtn.setOnClickListener(...
                FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        Fragment prev = getSupportFragmentManager().findFragmentByTag("yourTag");
        if (prev != null) {
            ft.remove(prev);
        }
        ft.addToBackStack(null);

        DialogFragment dialogFragment = ExampleDialogFragment.newInstance();
        dialogFragment.show(ft, "yourTag");
     )
}


@Override
updateText(String text) {
    youtView.setText(text)
}

class CoolDialogFragment extend DialogFragment {

     private Callback callback;


     @Override
      void onAttach(Context context) {
          callback = (Callback) context
      }

      @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        Dialog dialog = new Dialog(getActivity());
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        return dialog;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.dialog_fragment_example, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
         //find the views in the dialog fragment
         closeBtn.clickListener(...
               callback.updateText(edittext.getText().toString())
               dismiss()
         )
    }
}

这是对话框片段的要点 https://gist.github.com/cutiko/7e307efcf7492ea52ef05cd90f9e3203

Here is a gist of a dialog fragment https://gist.github.com/cutiko/7e307efcf7492ea52ef05cd90f9e3203

问题是您想将对话框片段与另一个组件连接起来，并且希望直接进行.这不是一个好习惯，因为yiu会创建2个高度连接的组件，因此最好是使用数据持久性和某种形式的React编程

The problem is you want to connect a dialog fragment with a another component, and you want to do it straigth forward. This is not considered a good practice because yiu create 2 componentes higly attached, so the best would be to use data persistence and some form of react programming

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