最近在调试程序的时候发现一个比较诡异的问题。
E FATAL EXCEPTION: main
Process: com.eathemeat.justplayer, PID: 22047
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.eathemeat.justplayer/com.eathemeat.justplayer.play.PlayActivity}: android.view.InflateException: Binary XML file line #82 in com.eathemeat.justplayer:layout/activity_play: Binary XML file line #82 in com.eathemeat.justplayer:layout/activity_play: Error inflating class com.eathemeat.widget.slide.NiftySliderat android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4034)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4187)at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149)at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:99)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2632)at android.os.Handler.dispatchMessage(Handler.java:106)at android.os.Looper.loopOnce(Looper.java:222)at android.os.Looper.loop(Looper.java:314)at android.app.ActivityThread.main(ActivityThread.java:8690)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:565)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
Caused by: android.view.InflateException: Binary XML file line #82 in com.eathemeat.justplayer:layout/activity_play: Binary XML file line #82 in com.eathemeat.justplayer:layout/activity_play: Error inflating class com.eathemeat.widget.slide.NiftySlider
Caused by: android.view.InflateException: Binary XML file line #82 in com.eathemeat.justplayer:layout/activity_play: Error inflating class com.eathemeat.widget.slide.NiftySlider
Caused by: java.lang.reflect.InvocationTargetExceptionat java.lang.reflect.Constructor.newInstance0(Native Method)at java.lang.reflect.Constructor.newInstance(Constructor.java:343)at android.view.LayoutInflater.createView(LayoutInflater.java:879)at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1035)at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:986)at android.view.LayoutInflater.rInflate(LayoutInflater.java:1165)at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1126)at android.view.LayoutInflater.rInflate(LayoutInflater.java:1168)at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1126)at android.view.LayoutInflater.inflate(LayoutInflater.java:707)at android.view.LayoutInflater.inflate(LayoutInflater.java:545)at com.eathemeat.justplayer.databinding.ActivityPlayBinding.inflate(ActivityPlayBinding.java:78)at com.eathemeat.justplayer.databinding.ActivityPlayBinding.inflate(ActivityPlayBinding.java:72)at com.eathemeat.justplayer.play.PlayActivity.onCreate(PlayActivity.kt:43)at android.app.Activity.performCreate(Activity.java:8886)at android.app.Activity.performCreate(Activity.java:8851)at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1470)at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4016)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4187)at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149)at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:99)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2632)at android.os.Handler.dispatchMessage(Handler.java:106)at android.os.Looper.loopOnce(Looper.java:222)at android.os.Looper.loop(Looper.java:314)at android.app.ActivityThread.main(ActivityThread.java:8690)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:565)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
Caused by: android.content.res.Resources$NotFoundException: File res/color/default_track_color.xml from ComplexColor resource ID #0x7f050035at android.content.res.ResourcesImpl.loadComplexColorForCookie(ResourcesImpl.java:1286)at android.content.res.ResourcesImpl.loadComplexColorFromName(ResourcesImpl.java:1112)at android.content.res.ResourcesImpl.loadColorStateList(ResourcesImpl.java:1191)at android.content.res.Resources.getColorStateList(Resources.java:1195)at androidx.core.content.res.ResourcesCompat$Api23Impl.getColorStateList(ResourcesCompat.java:687)at androidx.core.content.res.ResourcesCompat.getColorStateList(ResourcesCompat.java:246)at androidx.core.content.ContextCompat.getColorStateList(ContextCompat.java:508)at androidx.appcompat.content.res.AppCompatResources.getColorStateList(AppCompatResources.java:48)at com.eathemeat.widget.slide.AbsSlider.processAttributes(AbsSlide.kt:292)at com.eathemeat.widget.slide.AbsSlider.<init>(AbsSlide.kt:243)at com.eathemeat.widget.slide.NiftySlider.<init>(NiftySlider.kt:16)at com.eathemeat.widget.slide.NiftySlider.<init>(NiftySlider.kt:15)at com.eathemeat.widget.slide.NiftySlider.<init>(Unknown Source:11)... 30 more
Caused by: java.lang.UnsupportedOperationException: Can't convert value at index 0 to color: type=0x1, theme={InheritanceMap=[id=0x7f10022bcom.eathemeat.justplayer:style/Theme.JustPlayer, id=0x7f10025acom.eathemeat.justplayer:style/Theme.MaterialComponents.DayNight.NoActionBar.Bridge, id=0x7f100275com.eathemeat.justplayer:style/Theme.MaterialComponents.NoActionBar.Bridge, id=0x7f100249com.eathemeat.justplayer:style/Theme.MaterialComponents.Bridge, id=0x7f100066com.eathemeat.justplayer:style/Base.Theme.MaterialComponents.Bridge, id=0x7f100092com.eathemeat.justplayer:style/Base.V14.Theme.MaterialComponents.Bridge, id=0x7f10013ccom.eathemeat.justplayer:style/Platform.MaterialComponents, id=0x7f10020fcom.eathemeat.justplayer:style/Theme.AppCompat, id=0x7f10004bcom.eathemeat.justplayer:style/Base.Theme.AppCompat, id=0x7f1000b8com.eathemeat.justplayer:style/Base.V28.Theme.AppCompat, id=0x7f1000b5com.eathemeat.justplayer:style/Base.V26.Theme.AppCompat, id=0x7f1000afcom.eathemeat.justplayer:style/Base.V23.Theme.AppCompat, id=0x7f1000adcom.eathemeat.justplayer:style/Base.V22.Theme.AppCompat, id=0x7f1000a1com.eathemeat.justplayer:style/Base.V21.Theme.AppCompat, id=0x7f1000bacom.eathemeat.justplayer:style/Base.V7.Theme.AppCompat, id=0x7f10013acom.eathemeat.justplayer:style/Platform.AppCompat, id=0x7f100145com.eathemeat.justplayer:style/Platform.V25.AppCompat, id=0x103022eandroid:style/Theme.Material.NoActionBar, id=0x1030224android:style/Theme.Material, id=0x1030005android:style/Theme], Themes=[com.eathemeat.justplayer:style/Theme.JustPlayer, forced, com.eathemeat.justplayer:style/Theme.AppCompat.Empty, forced, android:style/Theme.DeviceDefault.Light.DarkActionBar, forced]}at android.content.res.TypedArray.getColor(TypedArray.java:538)at android.content.res.ColorStateList.inflate(ColorStateList.java:366)at android.content.res.ColorStateList.createFromXmlInner(ColorStateList.java:296)at android.content.res.ResourcesImpl.loadComplexColorForCookie(ResourcesImpl.java:1279)... 42 more原因是：android.content.res.Resources$NotFoundException: File res/color/default_track_color.xml from ComplexColor resource ID #0x7f050035这个资源找不到，这个资源是在一个UI控件的aar中，然后去看了下aar和apk中其实都是有这个xml的文件的。
解决：在网上找了很多的资料，有很多的原因：
- android问题的（查了下源码，在找xml文件和解析的时候出现错误都会包这个问题）
- 打包问题，在apk和aar中都有这个文件。排除
- android版本问题，有说是api24以下有getcolorstatelist的时候会出现这类问题。
搞了很久，还没没有办法从log上定位问题的原因。于是从自身出发，在这文件中查询问题：
试了很多的方法，最终定位问题：
//之前的代码
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:color="@attr/colorPrimary" android:state_enabled="true" /><item android:alpha="0.32" android:color="@android:color/black" />
</selector>//修改后的代码
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:color="?attr/colorPrimary" android:state_enabled="true" /><item android:alpha="0.32" android:color="@android:color/black" />
</selector>根本原因就是@和？的差别。在解析xml的时候由于无法定位主题中
@代表引用资源
? 代表引用主题属性
这2者会比较容易搞错。但是在lint中并不会检查这个问题。