从DialogFragment返回值 [英] Return values from DialogFragment

问题描述

我正在执行的任务是单击EditText后需要显示一个对话框.在该对话框中，我使用RecyclerView显示具有RadioButton的内容.

I am doing task in which I need to show a dialog after clicking on EditText. In that dialog I show contents with RadioButtons using RecyclerView.

现在，我要做的是，从对话框中选择RadioButton(RecyclerView中的内容)后，它应该返回该内容的值，然后关闭对话框.

Now, what I want to do is, after selecting RadioButton (content which is in the RecyclerView) from dialog, it should return value of that content and then dialog should be dismissed.

要生成对话框，我使用了DialogFragment.

To generate a dialog I've used a DialogFragment.

由于我是android开发的新手，所以我很困惑，无法找到解决方案.

As I'm new in android development, I am totally confused and unable to find the solution.

推荐答案

由于您的对话框是DialogFragment，因此您可以使用两件事

Because your dialog is a DialogFragment you can use two things

1. 如果要从Activity启动对话框，则可以使用界面

1. If you are starting the dialog from a Activity, you can use an interface

• 创建接口

  • create an interface

    public interface ISelectedData {
        void onSelectedData(String string);
    }
    

  • 在活动"中实现界面

  • implement an interface in your Activity

    public class MyActivity implements ISelectedData {
    
        .....
    
        @Override 
        public void onSelectedData(String myValue) {
            // Use the returned value
        }
    }
    

  • 在对话框中，将界面附加到活动"

  • in your Dialog, attach the interface to your Activity

    private ISelectedData mCallback;
    
    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
    
        try {
            mCallback = (ISelectedData) activity;
        }
        catch (ClassCastException e) {
            Log.d("MyDialog", "Activity doesn't implement the ISelectedData interface");
        }
    }
    

  • 将值返回到活动"时，只需在对话框中调用

  • when returning the value to Activity, just call in your Dialog

    mCallback.onSelectedData("myValue");
    

    在Android开发者网站上查看示例.

    Check the example on the Android developer site.

    1. 如果要从Fragment启动对话框，则可以使用setTargetFragment(...)
    1. If you are starting the dialog from a Fragment, you can use setTargetFragment(...)

    • 启动对话框

      • starting the Dialog

        MyDialog dialog = new MyDialog();
        dialog.setTargetFragment(this, Constants.DIALOG_REQUEST_CODE);
        dialog.show(fragmentManager, Constants.DIALOG);
        

      • 从对话框返回值

      • returning the value from the Dialog

        Bundle bundle = new Bundle();
        bundle.putString(Constants.MY_VALUE, "MyValue");
        
        Intent intent = new Intent().putExtras(bundle);
        
        getTargetFragment().onActivityResult(getTargetRequestCode(), Activity.RESULT_OK, intent);
        
        dismiss();
        

      • 获取片段中的值

      • getting the value in Fragment

        @Override
        public void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
        
            if (requestCode == Constants.DIALOG_REQUEST_CODE) {
        
                if (resultCode == Activity.RESULT_OK) {
        
                    if (data.getExtras().containsKey(Constants.MY_VALUE)) {
        
                        String myValue = data.getExtras().getString(Constants.MY_VALUE);
        
                        // Use the returned value
                    }
                }
            }
        }     
        

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