Lifecycle 2.2.0 ViewModel

哎呀，烦死了，这些个api一天一个写法。更新时间2020年09月16日 20:14:11

最近更新时间	当前稳定版	下一候选版本	Beta 版	Alpha 版
2020 年 8 月 19 日	2.2.0	-	-	2.3.0-alpha07

引用依赖

dependencies {
        def lifecycle_version = "2.2.0"
        def arch_version = "2.1.0"

        // ViewModel
        implementation "androidx.lifecycle:lifecycle-viewmodel:$lifecycle_version"
        // LiveData
        implementation "androidx.lifecycle:lifecycle-livedata:$lifecycle_version"
        // Lifecycles only (without ViewModel or LiveData)
        implementation "androidx.lifecycle:lifecycle-runtime:$lifecycle_version"

        // Saved state module for ViewModel
        implementation "androidx.lifecycle:lifecycle-viewmodel-savedstate:$lifecycle_version"

        // Annotation processor
        annotationProcessor "androidx.lifecycle:lifecycle-compiler:$lifecycle_version"
        // alternately - if using Java8, use the following instead of lifecycle-compiler
        implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"

        // optional - helpers for implementing LifecycleOwner in a Service
        implementation "androidx.lifecycle:lifecycle-service:$lifecycle_version"

        // optional - ProcessLifecycleOwner provides a lifecycle for the whole application process
        implementation "androidx.lifecycle:lifecycle-process:$lifecycle_version"

        // optional - ReactiveStreams support for LiveData
        implementation "androidx.lifecycle:lifecycle-reactivestreams:$lifecycle_version"

        // optional - Test helpers for LiveData
        testImplementation "androidx.arch.core:core-testing:$arch_version"
    }

ViewModel

private ActivityMainBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.xxx);
        binding.setXXXViewModel(new ViewModelProvider(this).get(XXXViewModel.class));
        //使用 SavedStateViewModel
        //binding.setXXXViewModel(new ViewModelProvider(this, new SavedStateViewModelFactory(Application application, this)).get(XXXViewModel.class));
        binding.setLifecycleOwner(this);
    }