RxCommand

A command is an Observable triggered in response to some action, typicallyUI-related.

It manage the extra states, such as loading, enabled, errors for you, when using RxJava2 implement the functions of your ViewModel.

博客

Android 生命周期架构组件与 RxJava 完美协作

Code like this

ViewModel

public class MyViewModel extends ViewModel {

    public final RxCommand<List<User>> usersCommand;

    public MyViewModel(final UserRepository userRepository) {

        usersCommand = RxCommand.create(o -> {
                return userRepository.getUsers();
            });
    }
}

Activity

public class MyActivity extends AppCompatActivity {
    public void onCreate(Bundle savedInstanceState) {
        MyViewModel viewModel = ViewModelProviders.of(this).get(MyViewModel.class);

        viewModel.usersCommand
                .switchToLatest()
                .observeOn(AndroidSchedulers.mainThread())
                .compose(Live.bindLifecycle(this))
                .subscribe(users -> {
                    // update UI
                });

        viewModel.usersCommand
                .executing()
                .compose(Live.bindLifecycle(this))
                .subscribe(executing -> {
                    // show or hide loading
                })

        viewModel.usersCommand
                .errors()
                .compose(Live.bindLifecycle(this))
                .subscribe(throwable -> {
                    // show error message
                });
    }
}

Usage

buildscript {
    repositories {
        jcenter()
        maven { url 'https://maven.google.com' }
    }
}

dependencies {

    //  using Support Library 26.1+
    compile 'com.android.support:appcompat-v7:26.1.0'
    compile 'com.android.support:support-v4:26.1.0'
    compile 'com.android.support:design:26.1.0'

    // RxJava
    compile 'io.reactivex.rxjava2:rxjava:2.1.0'
    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'

    // Live
    compile 'com.shundaojia:live:1.0.2'

    // RxCommand
    compile 'com.shundaojia:rxcommand:1.2.2'
    compile 'android.arch.lifecycle:extensions:1.0.0' // for ViewModel

}