37.4 Adding Saved State Support to the ViewModelDemo Project

With the basics of ViewModel Saved State covered, the ViewModelDemo app can be extended to include this support. Begin by loading the ViewModelDemo_LiveData project created in “An Android Jetpack LiveData Tutorial” into Android Studio (a copy of the project is also available in the sample code download), opening the build.gradle (Module: ViewModelDemo.app) file and adding the Saved State library dependencies (checking, as always, if more recent library versions are available):

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dependencies {

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    implementation "androidx.savedstate:savedstate:1.0.0"

    implementation "androidx.lifecycle:lifecycle-viewmodel-savedstate:2.2.0"

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}

Next, modify the MainViewModel.java file so that the constructor accepts and stores a SavedStateHandle instance. Also import androidx.lifecycle.SavedStateHandle, declare a key string...