仅当minifyEnabled并与LifeCycle v 2.1.0一起使用时，应用程序在创建ViewModel时崩溃

Question

使用lazy{}创建视图模型时，我的应用在启动时因LinkageError崩溃。 仅在以下情况下才发生崩溃：

1. minifyEnabled设置为true ，并且
2. 我用ver。 2.1.0生命周期组件。 它与带minifyEnabled lifecycle-2.0.0一起minifyEnabled

    def lifecycle_version = '2.1.0'
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
    implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"

此外，崩溃仅发生在其中一种视图模型上。 在此活动之前接触过的同一活动中的其他视图模型不会使应用程序崩溃。

---

崩溃发生在第二行：

    private val searchStackViewModel by lazy {
        ViewModelProviders.of(this)[SearchStateViewModel::class.java]
    }

SearchStateViewModel是：

class SearchStateViewModel : ViewModel() {

    // Live data that initialises to empty stack with SearchStack.init
    private val privateStack = MutableLiveData<SearchStack>().apply {
        value = SearchStack()
    }

    // Observable view of search stack so it can't be directly modified
    internal val stateStack : LiveData<SearchStack> = privateStack

    /**
     * Add state to stack
     */
    fun add(searchState: SearchState) {
        val current = privateStack.value ?: SearchStack()
        current.add(searchState)
        privateStack.value = current
    }

    /**
     * Clear stack
     */
    fun clear() {
        val current = privateStack.value ?: SearchStack()
        current.clear()
        privateStack.value = current
    }

    /**
     * Clear stack, then add current state as the only state
     */
    fun clearThenAdd(searchState: SearchState) {
        val current = privateStack.value ?: SearchStack()
        current.clear()
        current.add(searchState)
        privateStack.value = current
    }

    /**
     * Get currentState search state, without changing the stack
     */
    fun currentState(): SearchState {
        return privateStack.value?.last() ?: SearchState()
    }

    /**
     * Return currentState search state, and remove it from the stack
     */
    fun pop(): SearchState {
        val current = privateStack.value ?: SearchStack()
        val poppedState = current.pop()
        privateStack.value = current
        return poppedState
    }
}

SearchStack只是一个ArrayList：

class SearchStack : ArrayList<SearchState>() {

    init {
        add(SearchState())
    }


    fun pop(): SearchState = if (lastIndex > 0) removeAt(lastIndex) else last()


    override fun clear() {
        super.clear()
        add(SearchState())
    }


    override fun add(element: SearchState): Boolean {
        if (element == lastOrNull())
            return false
        return super.add(element)
    }
}

而且SearchState是一个数据类：

@Parcelize
data class SearchState(
        val searchTerm: String = "",
        val isComplete: Boolean? = null,
        val dueOnly: Boolean = false,
        val aliveOnly: Boolean = true,
        val priority: Char? = null,
        val project: String? = null,
        val priorityMatchType: PriorityMatchType? = null,
        val name: String = "",
        val hideThresholdTasks: Boolean = true,
        val sortOrder: Int = -1,
        val sortOrderString: String? = null
                      ) : Parcelable {

    enum class PriorityMatchType {
        GREATOR,
        LESSOR,
        EXACT
    }

    enum class TaskState {
        DUE,
        PENDING,
        COMPLETED,
        ALL
    }

---

堆栈跟踪：

FATAL EXCEPTION: main
    Process: net.c306.ttsuper, PID: 7380
    java.lang.LinkageError: i.a.a.o.b
1 >>    at net.c306.ttsuper.view.ui.MainActivity$v.b(SourceFile:182)
        at net.c306.ttsuper.view.ui.MainActivity$v.b(SourceFile:159)
        at g.j.a(SourceFile:74)
        at net.c306.ttsuper.view.ui.MainActivity.F(SourceFile)
2 >>    at net.c306.ttsuper.view.ui.MainActivity.c(SourceFile:1839)
        at net.c306.ttsuper.view.ui.MainActivity.a(SourceFile:1993)
        at net.c306.ttsuper.view.ui.MainActivity.a(SourceFile:1967)
        at net.c306.ttsuper.view.ui.MainActivity.onCreate(SourceFile:386)
        at android.app.Activity.performCreate(Activity.java:6251)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
        at android.app.ActivityThread.-wrap11(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5417)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

标记为（1）的行是发生崩溃的ViewModel的延迟创建。
标记为（2）的行是对ViewModel的首次访问，它启动了延迟创建：

val lastState = searchStackViewModel.currentState()

Answer 1

我可能已经解决了。 事实证明，在lifecycle-2.0.0 ，ViewModel类具有公共方法clear() ：

    @MainThread
    final void clear() {
        mCleared = true;
        // Since clear() is final, this method is still called on mock objects
        // and in those cases, mBagOfTags is null. It'll always be empty though
        // because setTagIfAbsent and getTag are not final so we can skip
        // clearing it
        if (mBagOfTags != null) {
            synchronized (mBagOfTags) {
                for (Object value : mBagOfTags.values()) {
                    // see comment for the similar call in setTagIfAbsent
                    closeWithRuntimeException(value);
                }
            }
        }
        onCleared();
    }

我的SearchStackViewModel也有一个完全不相关的clear()方法。

    /**
     * Clear stack
     */
    fun clear() {
        val current = privateStack.value ?: SearchStack()
        current.clear()
        privateStack.value = current
    }

当minifyEnabled启用时，两者之间似乎存在冲突，因此发生了链接错误。 我重命名了方法，然后崩溃停止了。