问题

功能很简单，给某个点击区域设置按压态，正常颜色是 @color/colorPrimaryDark，被点击时是 @color/colorPrimary，用 selector 实现，具体代码如下：

MainActivity:

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }}

activity_main.xml:

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

background.xml 放在 res/color 目录下，内容为：

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

在 Android 10 上运行正常，但是在 Android 9 版本上崩溃，堆栈日志如下：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.bgdrawabledemo/com.example.bgdrawabledemo.MainActivity}: android.view.InflateException: Binary XML file line #2: Binary XML file line #2: Error inflating class android.support.constraint.ConstraintLayout        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3430)        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3614)        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:86)        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2199)        at android.os.Handler.dispatchMessage(Handler.java:112)        at android.os.Looper.loop(Looper.java:216)        at android.app.ActivityThread.main(ActivityThread.java:7625)        at java.lang.reflect.Method.invoke(Native Method)        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)     Caused by: android.view.InflateException: Binary XML file line #2: Binary XML file line #2: Error inflating class android.support.constraint.ConstraintLayout     Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class android.support.constraint.ConstraintLayout     Caused by: java.lang.reflect.InvocationTargetException        at java.lang.reflect.Constructor.newInstance0(Native Method)        at java.lang.reflect.Constructor.newInstance(Constructor.java:343)        at android.view.LayoutInflater.createView(LayoutInflater.java:658)        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:801)        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:741)        at android.view.LayoutInflater.inflate(LayoutInflater.java:492)        at android.view.LayoutInflater.inflate(LayoutInflater.java:423)        at android.view.LayoutInflater.inflate(LayoutInflater.java:374)        at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)        at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)        at com.example.bgdrawabledemo.MainActivity.onCreate(MainActivity.java:11)        at android.app.Activity.performCreate(Activity.java:7458)        at android.app.Activity.performCreate(Activity.java:7448)        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1286)        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3409)        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3614)        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:86)        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2199)        at android.os.Handler.dispatchMessage(Handler.java:112)        at android.os.Looper.loop(Looper.java:216)        at android.app.ActivityThread.main(ActivityThread.java:7625)        at java.lang.reflect.Method.invoke(Native Method)        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)     Caused by: android.content.res.Resources$NotFoundException: Drawable com.example.bgdrawabledemo:color/background with resource ID #0x7f04001a     Caused by: android.content.res.Resources$NotFoundException: File res/color/background.xml from drawable resource ID #0x7f04001a        at android.content.res.ResourcesImpl.loadDrawableForCookie(ResourcesImpl.java:1166)        at android.content.res.ResourcesImpl.loadDrawable(ResourcesImpl.java:917)        at android.content.res.Resources.loadDrawable(Resources.java:1083)2020-05-27 14:16:49.102 24089-24089/com.example.bgdrawabledemo E/AndroidRuntime:     at android.content.res.TypedArray.getDrawableForDensity(TypedArray.java:1010)        at android.content.res.TypedArray.getDrawable(TypedArray.java:985)        at android.view.View.(View.java:5050)        at android.view.ViewGroup.(ViewGroup.java:659)        at android.view.ViewGroup.(ViewGroup.java:655)        at android.view.ViewGroup.(ViewGroup.java:651)        at android.support.constraint.ConstraintLayout.(ConstraintLayout.java:575)        at java.lang.reflect.Constructor.newInstance0(Native Method)        at java.lang.reflect.Constructor.newInstance(Constructor.java:343)        at android.view.LayoutInflater.createView(LayoutInflater.java:658)        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:801)        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:741)        at android.view.LayoutInflater.inflate(LayoutInflater.java:492)        at android.view.LayoutInflater.inflate(LayoutInflater.java:423)        at android.view.LayoutInflater.inflate(LayoutInflater.java:374)        at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)        at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)        at com.example.bgdrawabledemo.MainActivity.onCreate(MainActivity.java:11)        at android.app.Activity.performCreate(Activity.java:7458)        at android.app.Activity.performCreate(Activity.java:7448)        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1286)        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3409)        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3614)        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:86)        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2199)        at android.os.Handler.dispatchMessage(Handler.java:112)        at android.os.Looper.loop(Looper.java:216)        at android.app.ActivityThread.main(ActivityThread.java:7625)        at java.lang.reflect.Method.invoke(Native Method)        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)     Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #3:  tag requires a 'drawable' attribute or child tag defining a drawable        at android.graphics.drawable.StateListDrawable.inflateChildElements(StateListDrawable.java:190)        at android.graphics.drawable.StateListDrawable.inflate(StateListDrawable.java:122)        at android.graphics.drawable.DrawableInflater.inflateFromXmlForDensity(DrawableInflater.java:148)        at android.graphics.drawable.Drawable.createFromXmlInnerForDensity(Drawable.java:1332)        at android.graphics.drawable.Drawable.createFromXmlForDensity(Drawable.java:1291)        at android.content.res.ResourcesImpl.loadDrawableForCookie(ResourcesImpl.java:1144)        ... 35 more

解决方案

凭着经验摸索出了解决方案，即：

background.xml 由 res/color 目录移至 res/drawable 目录；
布局文件引用改为 android:background="@drawable/background"
background.xml 内容修改为如下：

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

具体原因暂未知，有懂得大神请不吝赐教。

Binary XML file line 2: Error inflating class

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