升級後，想說試試官方的 Samples

Android Studio 3.1.3 編譯 AppUsageStatistics Sample

https://github.com/googlesamples/android-AppUsageStatistics/#readme

結果 error 滿天飛

這些錯誤訊息都沒有幫助，甚至有誤導之嫌…..

找了三天，原來是 build.gradle 裡面

dependencies {

compile ‘com.android.support:support-v4:27.0.2’
compile ‘com.android.support:support-v13:27.0.2’
compile ‘com.android.support:cardview-v7:27.0.2’
compile ‘com.android.support:appcompat-v7:27.0.2’
compile ‘com.android.support:recyclerview-v7:+’
compile ‘com.android.support:appcompat-v7:21.+’
}

改成…..

dependencies {
    implementation 'com.android.support:support-v4:27.0.2'
    implementation 'com.android.support:support-v13:27.0.2'
    implementation 'com.android.support:cardview-v7:27.0.2'
    implementation 'com.android.support:appcompat-v7:27.0.2'
    implementation 'com.android.support:recyclerview-v7:27.0.2'
}

版本號碼不要用 "+"，就沒 error
compile 改成 implementation 可以去除警告訊息

感謝這篇最後有個高手提示
https://stackoverflow.com/questions/50266035/no-resource-identifier-found-for-attribute-appcomponentfactory-in-package-and
要不然，依照錯誤訊息找到的文章大部分都要你關閉 AAPT2，雖然真的減少一兩個報錯，可是卻使問題更難找了，
而且，關閉這個新的資源編譯器，對未來開發很不利阿!!

在Android Studio App Project 加入 Google Maps Activity 遇到執行錯誤，在 Gradle Console 訊息如下：

:app:transformClassesWithDexForDebug FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ‘:app:transformClassesWithDexForDebug’.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.dex.DexIndexOverflowException: method ID not in [0, 0xffff]: 65536

---

 

Google 老半天，有的說程式需要減肥，有的是Android Studio Invalidate Caches 需要清乾淨，或是有人 clean project……不過，還是比較多人提到版本衝突問題：

試了老半天，在Build.Grandle 找到這一段，修改後有效：

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.0.0'
    compile 'com.google.android.gms:play-services-appindexing:9.8.0'
    compile 'com.google.android.gms:play-services:9.8.0'
    testCompile 'junit:junit:4.12'
}

把這兩列改為：

compile 'com.google.android.gms:play-services-appindexing:8.1.0'
compile 'com.google.android.gms:play-services:8.1.0'

這樣就能順利執行，至於Google Service 版本號碼，可以搜尋 google play service previous versions