android - 在 RxJava 中链接对话 fragment 结果

Question

我们如何在 RxJava 链中链接对话 fragment 并等待其结果(单击哪个按钮)。

类似于:

buttonClickObservable.flatMap(v -> showDialogAndWaitForResponse()).subscribe(dialogResult -> doSomething());

这可能吗？请有人指导我。

谢谢。

Answer 1

如果您正在使用 RxBinding 库，您可以这样做:

buttonClickObservable
            .doOnNext(e -> showDialog())
            .flatMap(v -> dialogBtnClickObservable)
            .subscribe(clicked -> Log.d("TAG", "It's working!"));

编辑: 好的，事实证明使用 RxBinding 观察对话框的 View 并不是那么容易。所以，这是一个使用 RxBinding 和 PublishSubject

的完整示例

public class MainActivity extends AppCompatActivity {
    Button btn;

    //here you can declare the Subject with the type
    //you're expecting as a result from the dialog
    public static final Subject<String> fragmentResultSubject = PublishSubject.create();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn = findViewById(R.id.btn);

        RxView.clicks(btn)
                .doOnNext(e -> showDialog())
                .flatMap(v -> fragmentResultSubject)
                .subscribe(fragmentResult -> Log.d("TAG", fragmentResult));
    }

    private MyDialogFragment showDialog() {
        MyDialogFragment myDialogFragment = new MyDialogFragment();
        myDialogFragment.show(getSupportFragmentManager(), "FRAG_TAG");

        return myDialogFragment;
    }


    public static class MyDialogFragment extends DialogFragment {
        Button dialogBtn;

        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_dialog, container, false);
            dialogBtn = rootView.findViewById(R.id.dialogBtn);
            dialogBtn.setOnClickListener(v -> fragmentResultSubject.onNext("Fragment btn clicked"));

            return rootView;
        }
    }
}