带有 appcompat-v7:28.0.0 的 Android ClassNotFoundException

Question

我正在开发一个 Android 应用程序，我尝试使用工具栏在其上添加一些功能；这就是我使用 appcompat-v7 模块的原因。我遵循了本教程（抱歉，因为它是西班牙语）并且我已经使用兼容性支持包更新了我的 IDE，我还将新模块添加到了我的 Gradle 文件中，并且我已经使用这个新工具栏更新了我的应用程序的设计 XML（我可以在设计编辑器中看到这个工具栏）。

但是，当我启动我的应用程序时，出现以下错误：

     java.lang.RuntimeException: Unable to start activity ComponentInfo{xxx}: android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class android.support.v7.widget.Toolbar
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class android.support.v7.widget.Toolbar
     Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class android.support.v7.widget.Toolbar
     Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v7.widget.Toolbar" on path: DexPathList[[zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/base.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_dependencies_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_resources_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_slice_0_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_slice_1_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_slice_2_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_slice_3_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_slice_4_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_slice_5_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_slice_6_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_slice_7_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_slice_8_apk.apk", zip file "/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.gomar.gomar_sanidad-xZFFzOUSrlLb9osLbk1xcA==/lib/x86, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(...

我的gradle文件：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.gomar.gomar_sanidad"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.0-beta01'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'com.android.support:appcompat-v7:28.0.0'
}

带有工具栏（设计 XML）的我的 activity_main.xml 示例：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.gomar.gomar_sanidad"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.0-beta01'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'com.android.support:appcompat-v7:28.0.0'
}

我已经尝试过这里所说的（检查 ID、清理项目、无效缓存...），但这些解决方案都没有达到预期的结果。你有什么主意吗？

提前致谢。

Answer 1

您同时使用 androidx 和 AppCompat 因此会出现错误。请考虑使用其中之一。

 implementation 'com.android.support:appcompat-v7:28.0.0' //this is appcompat

    implementation 'androidx.appcompat:appcompat:1.0.0-beta01' //this is android x

您不能同时使用 androidx 和 android 支持。
查看如何迁移到androidX