問題

debug 模式運行沒有問題，release模式打包后，頁面閃退，報錯如下：

 java.lang.LinkageError: Method void j.r.a.i.f.c.clear() overrides final method in class Landroidx/lifecycle/ViewModel; (declaration of 'j.r.a.i.f.c' appears in base.apk!classes3.dex)

一開始懷疑是混淆的問題，但是沒有發現問題，后來通過 注釋-排查 的方法，發現是命名的問題：

package androidx.lifecycle;

import androidx.annotation.MainThread;
import androidx.annotation.Nullable;

import java.io.Closeable;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public abstract class ViewModel {
    // Can't use ConcurrentHashMap, because it can lose values on old apis (see b/37042460)

    @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();
    }

}

lifecycle 的 ViewModel 中，有clear方法，我在業務代碼中也起相同名字方法，它還以為我是要繼承...overrides final method...

解決

原代碼：

class TaskNoticeViewModel : GraphqlViewModel() {

    // 清空消息
    fun clear() {
        cleanCall?.cancel()
        cleanCall = CleanTaskNoticeMutation.builder()
            .build()
            .requestOnlineAuth({
                logError("清空消息成功  ${it?.CleanMessage()}")
            },{
                logError("清空消息失敗")
                false
            })
    }
}

更改方法名即可

class TaskNoticeViewModel : GraphqlViewModel() {

    // 清空消息
    fun clearMessage() {
        cleanCall?.cancel()
        cleanCall = CleanTaskNoticeMutation.builder()
            .build()
            .requestOnlineAuth({
                logError("清空消息成功  ${it?.CleanMessage()}")
            },{
                logError("清空消息失敗")
                false
            })
    }
}