無法在ViewModelProviders中解析android.support.v4.app.FragmentActivity的方法

Question

我正在嘗試在應用程序中實現體系結構組件，但是當我使用getActivity()在片段中的視圖模型中添加生命周期getActivity()其顯示消息

無法解析android.support.v4.app.FragmentActivity的方法

這是我的代碼：

 viewModel = ViewModelProviders.of(getActivity()).get(MyViewModel.class);
        viewModel.setToken(token);
        viewModel.getRecent().observe(getActivity(), new Observer<List<Recent>>() {
            @Override
            public void onChanged(List<Recent> recent) {
                adapter.setData(recent);
            }
        });

我的片段來自android.support.v4.app.Fragment

和MyActivity擴展了AppCompatActivity

這是我的Gradle文件：

    def paging_version = "2.1.0"
    def lifecycle_version = "2.0.0"
    def room_version = "2.1.0-alpha04"

    implementation "androidx.room:room-runtime:$room_version"
    annotationProcessor "androidx.room:room-compiler:$room_version"
    implementation "androidx.paging:paging-runtime:$paging_version"
    implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"
    implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"

我該如何解決這個問題？ 提前致謝。

Answer 1

問題

在androidx.lifecycle.ViewModelProviders.of(FragmentActivity) ，他們接受androidx.fragment.app.FragmentActivity ，而不是android.support.v4.app.FragmentActivity 。

解

1. 使用從Android Studio 3.2引入的“ Migrate to AndroidX將整個項目Migrate to AndroidX 。 您可以在此頁面中找到信息
2. 更改依賴項版本以支持庫版本。 依賴版本可以在此頁面找到

dependencies {
    def lifecycle_version = "1.1.1"

    // ViewModel and LiveData
    implementation "android.arch.lifecycle:extensions:$lifecycle_version"
    // alternatively - just ViewModel
    implementation "android.arch.lifecycle:viewmodel:$lifecycle_version" // For Kotlin use viewmodel-ktx
    // alternatively - just LiveData
    implementation "android.arch.lifecycle:livedata:$lifecycle_version"
    // alternatively - Lifecycles only (no ViewModel or LiveData).
    //     Support library depends on this lightweight import
    implementation "android.arch.lifecycle:runtime:$lifecycle_version"

    annotationProcessor "android.arch.lifecycle:compiler:$lifecycle_version" // For Kotlin use kapt instead of annotationProcessor
    // alternately - if using Java8, use the following instead of compiler
    implementation "android.arch.lifecycle:common-java8:$lifecycle_version"

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

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