【AS-AndroidX】迁移AndroidX带来的问题

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迁移主原文：https://blog.csdn.net/dandelionela/article/details/102976961 # 【AS-AndroidX】AndroidX的迁移 #

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问题1：使用自动迁移时报错

那么就需要去每一个报错的类里面，参照类对照表，逐一把未替换的support类及自动替换错的类修正成AndroidX的类

需要注意的是，IDE的build日志只输出100个错误，虽然写的是100个，其实后边还有很多。改完这100还有下一个100，加油！

问题2：百度地图SDK

报错：java.lang.UnsatisfiedLinkError: No implementation found for int com.baidu.mapsdkplatform.comjni.tools.JNITools.initClass

2019-11-12 11:55:59.209 23040-23040/? E/libc: Access denied finding property "ro.vendor.df.effect.conflict"2019-11-12 11:55:59.223 23040-23040/? E/NativeLoader: found libBaiduMapSDK_base_v5_4_4.so error2019-11-12 11:55:59.223 23040-23040/? E/.***.****: No implementation found for int com.baidu.mapsdkplatform.comjni.tools.JNITools.initClass(java.lang.Object, int) (tried Java_com_baidu_mapsdkplatform_comjni_tools_JNITools_initClass and Java_com_baidu_mapsdkplatform_comjni_tools_JNITools_initClass__Ljava_lang_Object_2I)2019-11-12 11:55:59.224 23040-23040/? E/AndroidRuntime: FATAL EXCEPTION: main    Process: com.*****.***.******, PID: 23040    java.lang.UnsatisfiedLinkError: No implementation found for int com.baidu.mapsdkplatform.comjni.tools.JNITools.initClass(java.lang.Object, int) (tried Java_com_baidu_mapsdkplatform_comjni_tools_JNITools_initClass and Java_com_baidu_mapsdkplatform_comjni_tools_JNITools_initClass__Ljava_lang_Object_2I)        at com.baidu.mapsdkplatform.comjni.tools.JNITools.initClass(Native Method)        at com.baidu.mapsdkplatform.comjni.tools.a.b(Unknown Source:6)        at com.baidu.mapsdkplatform.comapi.a.(Unknown Source:23)        at com.baidu.mapsdkplatform.comapi.a.a(Unknown Source:0)        at com.baidu.mapsdkplatform.comapi.c.a(Unknown Source:17)        at com.baidu.mapapi.SDKInitializer.initialize(Unknown Source:2)        at com.dandelionela.metro.elametro.MetroApplication.initializeBaiduMap(MyApplication.java:61)        at com.dandelionela.metro.elametro.MetroApplication.onCreate(MyApplication.java:53)        at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1183)...

第一步尝试去百度地图官方API文档找些资料，没有找到，所以就先升级了一下百度地图到V6.0.0仍然报错。

于是将jniLibs文件夹下的ndk支持库从单独的【armeabi-v7a】改为单独的【arm64-v8a】发现报错消失。

很奇怪，在升级AndroidX之前同一手机使用armeabi-v7a可以正常使用，升级完AndroidX之后，就不行了。也是奇怪。

问题3：

2019-11-12 13:43:19.118 27256-27256/com.***.*** E/libc: Access denied finding property "ro.vendor.df.effect.conflict"2019-11-12 13:43:19.136 27256-27295/com.***.*** E/Perf: Fail to get file list lib2019-11-12 13:43:19.136 27256-27295/com.***.*** E/Perf: getFolderSize() : Exception_1 = java.lang.NullPointerException: Attempt to get length of null array2019-11-12 13:43:19.137 27256-27295/com.***.*** E/Perf: Fail to get file list ***.***.***.***2019-11-12 13:43:19.137 27256-27295/com.***.*** E/Perf: getFolderSize() : Exception_1 = java.lang.NullPointerException: Attempt to get length of null array2019-11-12 13:43:19.216 27256-27256/? E/AndroidRuntime: FATAL EXCEPTION: main    Process: com.***.***, PID: 27256    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.***.***/com.***.***.activity.WelcomeActivity}: android.view.InflateException: Binary XML file line #2 in com.***.***:layout/activity_welcome: Binary XML file line #2 in com.***.***/activity_welcome: Error inflating class androidx.constraintlayout.ConstraintLayout        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3304)        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3443)        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2040)        at android.os.Handler.dispatchMessage(Handler.java:107)        at android.os.Looper.loop(Looper.java:223)        at android.app.ActivityThread.main(ActivityThread.java:7520)        at java.lang.reflect.Method.invoke(Native Method)        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)     Caused by: android.view.InflateException: Binary XML file line #2 in com.***.***:layout/activity_welcome: Binary XML file line #2 in com.***.***:layout/activity_welcome: Error inflating class androidx.constraintlayout.ConstraintLayout     Caused by: android.view.InflateException: Binary XML file line #2 in com.***.***:layout/activity_welcome: Error inflating class androidx.constraintlayout.ConstraintLayout     Caused by: java.lang.ClassNotFoundException: androidx.constraintlayout.ConstraintLayout        at java.lang.Class.classForName(Native Method)        at java.lang.Class.forName(Class.java:454)        at android.view.LayoutInflater.createView(LayoutInflater.java:819)        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1010)        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:965)        at android.view.LayoutInflater.inflate(LayoutInflater.java:663)        at android.view.LayoutInflater.inflate(LayoutInflater.java:538)        at android.view.LayoutInflater.inflate(LayoutInflater.java:481)        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:555)        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:161)        at com.***.***.activity.WelcomeActivity.onCreate(WelcomeActivity.java:31)        at android.app.Activity.performCreate(Activity.java:7894)        at android.app.Activity.performCreate(Activity.java:7881)

突然找到了问题的关键所在：

androidx.constraintlayout.ConstraintLayout

这个类路径有误！这是由IDE自动转化为AndroidX的时候自动生成的。显然是错误的。我们只改了Java文件中的导包错误，却忽略了XML文件中的类的错误。

打开看一下源码：

<?xml version="1.0" encoding="utf-8"?>

果然是ConstraintLayout标签的包名不对。按照对照表，把错误的【androidx.constraintlayout.ConstraintLayout】修改为【androidx.constraintlayout.widget.ConstraintLayout】

然后全局检索一下错误的AndroidX替换，改为正确的AndroidX替换。几十处，擦。。。。。

同样的问题还发生在其他IDE导包错误的地方：

Caused by: java.lang.ClassNotFoundException: android.support.design.widget.TabLayoutCaused by: java.lang.ClassNotFoundException: androidx.core.view.ViewPagerCaused by: java.lang.ClassNotFoundException: android.support.v7.widget.RecyclerViewCaused by: java.lang.ClassNotFoundException: android.support.design.widget.FloatingActionButtonCaused by: java.lang.ClassNotFoundException: android.support.v4.widget.SwipeRefreshLayoutCaused by: java.lang.ClassNotFoundException: androidx.core.widget.SwipeRefreshLayoutCaused by: java.lang.ClassNotFoundException: androidx.core.widget.DrawerLayoutCaused by: java.lang.ClassNotFoundException: android.support.design.widget.CoordinatorLayoutCaused by: java.lang.ClassNotFoundException: android.support.design.widget.AppBarLayoutCaused by: java.lang.ClassNotFoundException: android.support.design.widget.NavigationViewCaused by: java.lang.ClassNotFoundException: android.support.constraint.Guideline

XML布局文件中需要修改的常用控件：

Support Library Class	AndroidX Class
android.support.constraint.ConstraintLayout	androidx.constraintlayout.widget.ConstraintLayout
android.support.design.widget.FloatingActionButton	com.google.android.material.floatingactionbutton.FloatingActionButton
android.support.design.widget.AppBarLayout	com.google.android.material.appbar.AppBarLayout
android.support.v7.widget.RecyclerView	androidx.recyclerview.widget.RecyclerView
android.support.design.widget.CoordinatorLayout	androidx.coordinatorlayout.widget.CoordinatorLayout
android.support.v7.widget.Toolbar	androidx.appcompat.widget.Toolbar
android.support.v4.widget.SwipeRefreshLayout	androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android.support.design.widget.TabLayout	com.google.android.material.tabs.TabLayout
android.support.v4.view.ViewPager	androidx.viewpager.widget.ViewPager
android.support.v4.widget.DrawerLayout	androidx.drawerlayout.widget.DrawerLayout
android.support.design.widget.NavigationView	com.google.android.material.navigation.NavigationView
android.support.v7.widget.SwitchCompat	androidx.appcompat.widget.SwitchCompat
android.support.design.widget.CollapsingToolbarLayout	com.google.android.material.appbar.CollapsingToolbarLayout
android.support.v7.widget.CardView	androidx.cardview.widget.CardView

容易被Android Studio 识别错误的控件：

Wrong AndroidX Class by IDE	Correct AndroidX Class
androidx.constraintlayout.ConstraintLayout	androidx.constraintlayout.widget.ConstraintLayout
androidx.core.widget.SwipeRefreshLayout	androidx.swiperefreshlayout.widget.SwipeRefreshLayout
androidx.core.view.ViewPager	androidx.viewpager.widget.ViewPager
androidx.core.widget.DrawerLayout	androidx.drawerlayout.widget.DrawerLayout

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