How to use Flowable in RxJava 2?

Question

There is an introduction of new Flowable in RxJava2. How to use this in android. There was no Flowable in RxJava1.

Answer 1

public class FlowableExampleActivity extends AppCompatActivity {

    private static final String TAG = FlowableExampleActivity.class.getSimpleName();
    Button btn;
    TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_example);
        btn = (Button) findViewById(R.id.btn);
        textView = (TextView) findViewById(R.id.textView);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                doSomeWork();
            }
        });
    }

    /*
     * simple example using Flowable
     */
    private void doSomeWork() {

        Flowable<Integer> observable = Flowable.just(1, 2, 3, 4);

        observable.reduce(50, new BiFunction<Integer, Integer, Integer>() {
            @Override
            public Integer apply(Integer t1, Integer t2) {
                return t1 + t2;
            }
        }).subscribe(getObserver());

    }

    private SingleObserver<Integer> getObserver() {

     return new SingleObserver<Integer>() {
        @Override
        public void onSubscribe(Disposable d) {
            Log.d(TAG, " onSubscribe : " + d.isDisposed());
        }

        @Override
        public void onSuccess(Integer value) {
            Log.d(TAG, " onSuccess : value : " + value);
        }

        @Override
        public void onError(Throwable e) {
            Log.d(TAG, " onError : " + e.getMessage());
        }
    };
}
}

I have a create a sample project to demonstrate the use of RxJava2. Here you can find the sample project - RxJava2-Android-Samples

Answer 2

This is what it says in the documentations

Practically, the 1.x fromEmitter (formerly fromAsync) has been renamed to Flowable.create. The other base reactive types have similar create methods (minus the backpressure strategy).

So you can use this in the same way as fromEmitter and fromAsync

Rx.2 Documentation