从 DialogFragment 返回值 [英] Return values from DialogFragment

问题描述

我正在执行单击EditText 后需要显示对话框的任务.在那个对话框中，我使用 RecyclerView 显示带有 RadioButton 的内容.

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

为了生成对话框，我使用了 DialogFragment.

由于我是 android 开发的新手，我完全困惑并且无法找到解决方案.

解决方案

因为你的对话框是一个 DialogFragment 你可以使用两个东西

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1. 如果您从 Activity 启动对话框，则可以使用接口

• 创建接口

  公共接口 ISelectedData {void onSelectedData(String string);}

• 在你的 Activity 中实现一个接口

  公共类 MyActivity 实现了 ISelectedData {.....@覆盖公共无效 onSelectedData(字符串 myValue){//使用返回值}}

• 在您的对话框中，将界面附加到您的活动

  private ISelectedData mCallback;@覆盖public void onAttach(活动活动){super.onAttach(活动)；尝试 {mCallback = (ISelectedData) 活动；}捕获(ClassCastException e){Log.d("MyDialog", "Activity 没有实现 ISelectedData 接口");}}

• 将值返回给 Activity 时，只需在您的 Dialog 中调用

  mCallback.onSelectedData("myValue");

  查看 Android 开发者网站上的示例.

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2. 如果您从 Fragment 开始对话框，您可以使用 setTargetFragment(...)

• 启动对话框

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

• 从对话框返回值

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

• 获取片段中的值

  @Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == Constants.DIALOG_REQUEST_CODE) {如果(结果代码 == Activity.RESULT_OK){如果 (data.getExtras().containsKey(Constants.MY_VALUE)) {String myValue = data.getExtras().getString(Constants.MY_VALUE);//使用返回值}}}}

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.

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.

To generate a dialog I've used a DialogFragment.

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

解决方案

Because your dialog is a DialogFragment you can use two things

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

• create an interface

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

• implement an interface in your Activity

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

• 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");
      }
  }
  

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

  mCallback.onSelectedData("myValue");
  

  Check the example on the Android developer site.

2. If you are starting the dialog from a Fragment, you can use setTargetFragment(...)

• starting the Dialog

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

• 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();
  

• 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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