我的android ConstraintLayout功能有问题... 在我的应用程序中，我使用ConstraintLayout，当我在9+安卓版本上安装我的应用程序时，一切正常，但是当我在较低的android版本上安装应用程序时，该应用程序崩溃了。 在我的android项目中，我有： minSdkVersion 21 targetSdkVersion 26 compileSdkVersion 28
任何人都不知道是什么原因造成的？还是解决它的方法？
编辑： 感谢 @Nikos Hidalgo ！ 我不正确理解错误消息。是我的渐变背景打破了一切。
我得到的错误如下：
11-12 15:44:32.580 11651-11651/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.repondeurtexto,PID: 11651
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.repondeurtexto/com.example.repondeurtexto.Firstactivity}: android.view.InflateException: Binary XML file line #2: Error inflating class androidx.constraintlayout.widget.ConstraintLayout
at android.app.activityThread.performLaunchactivity(activityThread.java:3150)
at android.app.activityThread.handleLaunchactivity(activityThread.java:3260)
at android.app.activityThread.access$1000(activityThread.java:218)
at android.app.activityThread$H.handleMessage(activityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.activityThread.main(activityThread.java:6934)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class androidx.constraintlayout.widget.ConstraintLayout
at android.view.LayoutInflater.createView(LayoutInflater.java:640)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:750)
at android.view.LayoutInflater.inflate(LayoutInflater.java:483)
at android.view.LayoutInflater.inflate(LayoutInflater.java:415)
at android.view.LayoutInflater.inflate(LayoutInflater.java:366)
at androidx.appcompat.app.appcompatdelegateImpl.setContentView(appcompatdelegateImpl.java:469)
at androidx.appcompat.app.AppCompatactivity.setContentView(AppCompatactivity.java:140)
at com.example.repondeurtexto.Firstactivity.onCreate(Firstactivity.java:15)
at android.app.activity.performCreate(activity.java:6609)
at android.app.Instrumentation.callactivityOnCreate(Instrumentation.java:1134)
at android.app.activityThread.performLaunchactivity(activityThread.java:3103)
at android.app.activityThread.handleLaunchactivity(activityThread.java:3260)
at android.app.activityThread.access$1000(activityThread.java:218)
at android.app.activityThread$H.handleMessage(activityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.activityThread.main(activityThread.java:6934)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: java.lang.reflect.invocationTargetException
at java.lang.reflect.Constructor.newInstance(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:288)
at android.view.LayoutInflater.createView(LayoutInflater.java:614)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:750)
at android.view.LayoutInflater.inflate(LayoutInflater.java:483)
at android.view.LayoutInflater.inflate(LayoutInflater.java:415)
at android.view.LayoutInflater.inflate(LayoutInflater.java:366)
at androidx.appcompat.app.appcompatdelegateImpl.setContentView(appcompatdelegateImpl.java:469)
at androidx.appcompat.app.AppCompatactivity.setContentView(AppCompatactivity.java:140)
at com.example.repondeurtexto.Firstactivity.onCreate(Firstactivity.java:15)
at android.app.activity.performCreate(activity.java:6609)
at android.app.Instrumentation.callactivityOnCreate(Instrumentation.java:1134)
at android.app.activityThread.performLaunchactivity(activityThread.java:3103)
at android.app.activityThread.handleLaunchactivity(activityThread.java:3260)
at android.app.activityThread.access$1000(activityThread.java:218)
at android.app.activityThread$H.handleMessage(activityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.activityThread.main(activityThread.java:6934)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: android.content.res.Resources$NotFoundException: Resource "com.example.repondeurtexto:drawable/gradient" (7f07006c) is not a Drawable (color or path): TypedValue{t=0x1/d=0x7f07006c a=-1 r=0x7f07006c}
at android.content.res.Resources.loadDrawableForCookie(Resources.java:4017)
at android.content.res.Resources.loadDrawable(Resources.java:3929)
at android.content.res.Resources.loadDrawable(Resources.java:3779)
at android.content.res.TypedArray.getDrawable(TypedArray.java:776)
at android.view.View.<init>(View.java:4001)
at android.view.ViewGroup.<init>(ViewGroup.java:513)
at android.view.ViewGroup.<init>(ViewGroup.java:509)
at android.view.ViewGroup.<init>(ViewGroup.java:505)
at androidx.constraintlayout.widget.ConstraintLayout.<init>(ConstraintLayout.java:575)
at java.lang.reflect.Constructor.newInstance(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:288)
at android.view.LayoutInflater.createView(LayoutInflater.java:614)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:750)
at android.view.LayoutInflater.inflate(LayoutInflater.java:483)
at android.view.LayoutInflater.inflate(LayoutInflater.java:415)
at android.view.LayoutInflater.inflate(LayoutInflater.java:366)
at androidx.appcompat.app.appcompatdelegateImpl.setContentView(appcompatdelegateImpl.java:469)
at androidx.appcompat.app.AppCompatactivity.setContentView(AppCompatactivity.java:140)
at com.example.repondeurtexto.Firstactivity.onCreate(Firstactivity.java:15)
at android.app.activity.performCreate(activity.java:6609)
at android.app.Instrumentation.callactivityOnCreate(Instrumentation.java:1134)
at android.app.activityThread.performLaunchactivity(activityThread.java:3103)
at android.app.activityThread.handleLaunchactivity(activityThread.java:3260)
at android.app.activityThread.access$1000(activityThread.java:218)
at android.app.activityThread$H.handleMessage(activityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.activityThread.main(activityThread.java:6934)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
在我的build.gradle中设置以下内容：
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'