Return values from DialogFragment

问题

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.

回答1:

Because your dialog is a DialogFragment you can use two things

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.

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
            }
        }
    }
}

来源：https://stackoverflow.com/questions/34526866/return-values-from-dialogfragment

标签

android

android-recyclerview

android-dialogfragment