add subscriber to Single observed value

I would like to know how can I add the subscriber for single as shown below in the code.
when i try to add .subscribe() or .blockingsubscribe() the autocomplete in eclise does not show them

code:

Single<List<List<Person>>> singles = Single.just(Main.getPersons());

    singles

    .observeOn(Schedulers.io())

    .map(x->System.out.println(x.size()))

asked Nov 13 '18 at 8:33

LetsamrIt

1,23432041

add a comment |

I would like to know how can I add the subscriber for single as shown below in the code.
when i try to add .subscribe() or .blockingsubscribe() the autocomplete in eclise does not show them

code:

Single<List<List<Person>>> singles = Single.just(Main.getPersons());

    singles

    .observeOn(Schedulers.io())

    .map(x->System.out.println(x.size()))

asked Nov 13 '18 at 8:33

LetsamrIt

1,23432041

add a comment |

I would like to know how can I add the subscriber for single as shown below in the code.
when i try to add .subscribe() or .blockingsubscribe() the autocomplete in eclise does not show them

code:

Single<List<List<Person>>> singles = Single.just(Main.getPersons());

    singles

    .observeOn(Schedulers.io())

    .map(x->System.out.println(x.size()))

asked Nov 13 '18 at 8:33

LetsamrIt

1,23432041

I would like to know how can I add the subscriber for single as shown below in the code.
when i try to add .subscribe() or .blockingsubscribe() the autocomplete in eclise does not show them

code:

Single<List<List<Person>>> singles = Single.just(Main.getPersons());

    singles

    .observeOn(Schedulers.io())

    .map(x->System.out.println(x.size()))

java java-8 observable rx-java2

asked Nov 13 '18 at 8:33

LetsamrIt

1,23432041

asked Nov 13 '18 at 8:33

LetsamrIt

1,23432041

asked Nov 13 '18 at 8:33

LetsamrIt

1,23432041

asked Nov 13 '18 at 8:33

LetsamrIt

1,23432041

asked Nov 13 '18 at 8:33

LetsamrIt

1,23432041

add a comment |

2 Answers
2

active

oldest

votes

Your map function should return something that you want to subscribe on:

.map(x -> {

    System.out.println(x.size());

    return ???;

 });

edited Nov 13 '18 at 8:57

answered Nov 13 '18 at 8:48

taygetos

867716

thanks but i want to use onsuccess and onError

– LetsamrIt
Nov 13 '18 at 9:04

you still going to need a subscription

– taygetos
Nov 13 '18 at 9:11

yes i know but can show me how to use the subscription?? i cant use it please provide an examlple

– LetsamrIt
Nov 13 '18 at 9:21

Single<List<List<Person>>> singles = Single.just(Main.getPersons()); singles .observeOn(Schedulers.io()) .map(x -> s.size()) .subscribe(x -> System.out.println(x))

– taygetos
Nov 13 '18 at 9:27

Could be the OP wants to print and return the size like you suggested. It is really hard to guess as the OP keeps asking questions with the very same code example over and over...

– akarnokd
Nov 13 '18 at 9:42

add a comment |

You are using the wrong lambda and it throws off your IDE. Try this:

Single<List<List<Person>>> singles = Single.just(Main.getPersons());

singles

.observeOn(Schedulers.io())

.doOnSuccess(x -> System.out.println(x.size()))

.  // <---------------------------------------- now it should bring up the autocomplete

edited Nov 13 '18 at 10:19

answered Nov 13 '18 at 9:23

akarnokd

49k9100148

You're right, he probably wants to use the .doOnNext

– taygetos
Nov 13 '18 at 9:37

thanks but why i could not use .map directly? it is Single and i should use map operator normally??

– LetsamrIt
Nov 13 '18 at 10:14

also there is no doOnNext with songle

– LetsamrIt
Nov 13 '18 at 10:18

Map requires a Function that takes an item and returns an item. A lambda of x -> System.out.println(x.size()) does not return anything as println is a void method. This is a syntax error so the IDE can no longer follow the types and suggest anything via autoComplete.

– akarnokd
Nov 13 '18 at 10:21

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

Your map function should return something that you want to subscribe on:

.map(x -> {

    System.out.println(x.size());

    return ???;

 });

edited Nov 13 '18 at 8:57

answered Nov 13 '18 at 8:48

taygetos

867716

thanks but i want to use onsuccess and onError

– LetsamrIt
Nov 13 '18 at 9:04

you still going to need a subscription

– taygetos
Nov 13 '18 at 9:11

yes i know but can show me how to use the subscription?? i cant use it please provide an examlple

– LetsamrIt
Nov 13 '18 at 9:21

Single<List<List<Person>>> singles = Single.just(Main.getPersons()); singles .observeOn(Schedulers.io()) .map(x -> s.size()) .subscribe(x -> System.out.println(x))

– taygetos
Nov 13 '18 at 9:27

Could be the OP wants to print and return the size like you suggested. It is really hard to guess as the OP keeps asking questions with the very same code example over and over...

– akarnokd
Nov 13 '18 at 9:42

add a comment |

Your map function should return something that you want to subscribe on:

.map(x -> {

    System.out.println(x.size());

    return ???;

 });

edited Nov 13 '18 at 8:57

answered Nov 13 '18 at 8:48

taygetos

867716

thanks but i want to use onsuccess and onError

– LetsamrIt
Nov 13 '18 at 9:04

you still going to need a subscription

– taygetos
Nov 13 '18 at 9:11

yes i know but can show me how to use the subscription?? i cant use it please provide an examlple

– LetsamrIt
Nov 13 '18 at 9:21

Single<List<List<Person>>> singles = Single.just(Main.getPersons()); singles .observeOn(Schedulers.io()) .map(x -> s.size()) .subscribe(x -> System.out.println(x))

– taygetos
Nov 13 '18 at 9:27

Could be the OP wants to print and return the size like you suggested. It is really hard to guess as the OP keeps asking questions with the very same code example over and over...

– akarnokd
Nov 13 '18 at 9:42

add a comment |

Your map function should return something that you want to subscribe on:

.map(x -> {

    System.out.println(x.size());

    return ???;

 });

edited Nov 13 '18 at 8:57

answered Nov 13 '18 at 8:48

taygetos

867716

Your map function should return something that you want to subscribe on:

.map(x -> {

    System.out.println(x.size());

    return ???;

 });

edited Nov 13 '18 at 8:57

answered Nov 13 '18 at 8:48

taygetos

867716

edited Nov 13 '18 at 8:57

answered Nov 13 '18 at 8:48

taygetos

867716

answered Nov 13 '18 at 8:48

taygetos

867716

answered Nov 13 '18 at 8:48

taygetos

867716

thanks but i want to use onsuccess and onError

– LetsamrIt
Nov 13 '18 at 9:04

you still going to need a subscription

– taygetos
Nov 13 '18 at 9:11

yes i know but can show me how to use the subscription?? i cant use it please provide an examlple

– LetsamrIt
Nov 13 '18 at 9:21

Single<List<List<Person>>> singles = Single.just(Main.getPersons()); singles .observeOn(Schedulers.io()) .map(x -> s.size()) .subscribe(x -> System.out.println(x))

– taygetos
Nov 13 '18 at 9:27

Could be the OP wants to print and return the size like you suggested. It is really hard to guess as the OP keeps asking questions with the very same code example over and over...

– akarnokd
Nov 13 '18 at 9:42

add a comment |

thanks but i want to use onsuccess and onError

– LetsamrIt
Nov 13 '18 at 9:04

you still going to need a subscription

– taygetos
Nov 13 '18 at 9:11

yes i know but can show me how to use the subscription?? i cant use it please provide an examlple

– LetsamrIt
Nov 13 '18 at 9:21

Single<List<List<Person>>> singles = Single.just(Main.getPersons()); singles .observeOn(Schedulers.io()) .map(x -> s.size()) .subscribe(x -> System.out.println(x))

– taygetos
Nov 13 '18 at 9:27

Could be the OP wants to print and return the size like you suggested. It is really hard to guess as the OP keeps asking questions with the very same code example over and over...

– akarnokd
Nov 13 '18 at 9:42

thanks but i want to use onsuccess and onError

– LetsamrIt
Nov 13 '18 at 9:04

you still going to need a subscription

– taygetos
Nov 13 '18 at 9:11

yes i know but can show me how to use the subscription?? i cant use it please provide an examlple

– LetsamrIt
Nov 13 '18 at 9:21

Single<List<List<Person>>> singles = Single.just(Main.getPersons()); singles .observeOn(Schedulers.io()) .map(x -> s.size()) .subscribe(x -> System.out.println(x))

– taygetos
Nov 13 '18 at 9:27

Could be the OP wants to print and return the size like you suggested. It is really hard to guess as the OP keeps asking questions with the very same code example over and over...

– akarnokd
Nov 13 '18 at 9:42

add a comment |

You are using the wrong lambda and it throws off your IDE. Try this:

Single<List<List<Person>>> singles = Single.just(Main.getPersons());

singles

.observeOn(Schedulers.io())

.doOnSuccess(x -> System.out.println(x.size()))

.  // <---------------------------------------- now it should bring up the autocomplete

edited Nov 13 '18 at 10:19

answered Nov 13 '18 at 9:23

akarnokd

49k9100148

You're right, he probably wants to use the .doOnNext

– taygetos
Nov 13 '18 at 9:37

thanks but why i could not use .map directly? it is Single and i should use map operator normally??

– LetsamrIt
Nov 13 '18 at 10:14

also there is no doOnNext with songle

– LetsamrIt
Nov 13 '18 at 10:18

Map requires a Function that takes an item and returns an item. A lambda of x -> System.out.println(x.size()) does not return anything as println is a void method. This is a syntax error so the IDE can no longer follow the types and suggest anything via autoComplete.

– akarnokd
Nov 13 '18 at 10:21

add a comment |

You are using the wrong lambda and it throws off your IDE. Try this:

Single<List<List<Person>>> singles = Single.just(Main.getPersons());

singles

.observeOn(Schedulers.io())

.doOnSuccess(x -> System.out.println(x.size()))

.  // <---------------------------------------- now it should bring up the autocomplete

edited Nov 13 '18 at 10:19

answered Nov 13 '18 at 9:23

akarnokd

49k9100148

You're right, he probably wants to use the .doOnNext

– taygetos
Nov 13 '18 at 9:37

thanks but why i could not use .map directly? it is Single and i should use map operator normally??

– LetsamrIt
Nov 13 '18 at 10:14

also there is no doOnNext with songle

– LetsamrIt
Nov 13 '18 at 10:18

Map requires a Function that takes an item and returns an item. A lambda of x -> System.out.println(x.size()) does not return anything as println is a void method. This is a syntax error so the IDE can no longer follow the types and suggest anything via autoComplete.

– akarnokd
Nov 13 '18 at 10:21

add a comment |

You are using the wrong lambda and it throws off your IDE. Try this:

Single<List<List<Person>>> singles = Single.just(Main.getPersons());

singles

.observeOn(Schedulers.io())

.doOnSuccess(x -> System.out.println(x.size()))

.  // <---------------------------------------- now it should bring up the autocomplete

edited Nov 13 '18 at 10:19

answered Nov 13 '18 at 9:23

akarnokd

49k9100148

You are using the wrong lambda and it throws off your IDE. Try this:

Single<List<List<Person>>> singles = Single.just(Main.getPersons());

singles

.observeOn(Schedulers.io())

.doOnSuccess(x -> System.out.println(x.size()))

.  // <---------------------------------------- now it should bring up the autocomplete

edited Nov 13 '18 at 10:19

answered Nov 13 '18 at 9:23

akarnokd

49k9100148

edited Nov 13 '18 at 10:19

answered Nov 13 '18 at 9:23

akarnokd

49k9100148

answered Nov 13 '18 at 9:23

akarnokd

49k9100148

answered Nov 13 '18 at 9:23

akarnokd

49k9100148

You're right, he probably wants to use the .doOnNext

– taygetos
Nov 13 '18 at 9:37

thanks but why i could not use .map directly? it is Single and i should use map operator normally??

– LetsamrIt
Nov 13 '18 at 10:14

also there is no doOnNext with songle

– LetsamrIt
Nov 13 '18 at 10:18

Map requires a Function that takes an item and returns an item. A lambda of x -> System.out.println(x.size()) does not return anything as println is a void method. This is a syntax error so the IDE can no longer follow the types and suggest anything via autoComplete.

– akarnokd
Nov 13 '18 at 10:21

add a comment |

You're right, he probably wants to use the .doOnNext

– taygetos
Nov 13 '18 at 9:37

thanks but why i could not use .map directly? it is Single and i should use map operator normally??

– LetsamrIt
Nov 13 '18 at 10:14

also there is no doOnNext with songle

– LetsamrIt
Nov 13 '18 at 10:18

Map requires a Function that takes an item and returns an item. A lambda of x -> System.out.println(x.size()) does not return anything as println is a void method. This is a syntax error so the IDE can no longer follow the types and suggest anything via autoComplete.

– akarnokd
Nov 13 '18 at 10:21

You're right, he probably wants to use the .doOnNext

– taygetos
Nov 13 '18 at 9:37

thanks but why i could not use .map directly? it is Single and i should use map operator normally??

– LetsamrIt
Nov 13 '18 at 10:14

also there is no doOnNext with songle

– LetsamrIt
Nov 13 '18 at 10:18

Map requires a Function that takes an item and returns an item. A lambda of x -> System.out.println(x.size()) does not return anything as println is a void method. This is a syntax error so the IDE can no longer follow the types and suggest anything via autoComplete.

– akarnokd
Nov 13 '18 at 10:21

add a comment |

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