我尝试使用firebase-messaging和androidX。为此，我将这样的库添加到项目gradle文件中。
dependencies {
//support library
implementation 'com.google.android.material:material:1.0.0-rc02'
implementation 'androidx.legacy:legacy-support-v4:1.0.0-rc02'
implementation 'androidx.appcompat:appcompat:1.0.0-rc02'
implementation 'androidx.cardview:cardview:1.0.0-rc02'
implementation 'androidx.appcompat:appcompat:1.0.0-rc02'
implementation 'androidx.recyclerview:recyclerview:1.0.0-rc02'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
...
implementation ('com.google.firebase:firebase-messaging:17.3.1'){
}
}
我遇到此错误：
程序类型已经存在：android.support.v4.media.MediaBrowserCompat$MediaBrowserImplApi21$1 Message{kind=ERROR, text=Program type already present: android.support.v4.media.MediaBrowserCompat$MediaBrowserImplApi21$1, sources=[Unknown source file], tool name=Optional.of(D8)}
我这样更改gradle文件：
dependencies {
//support library
implementation 'com.google.android.material:material:1.0.0-rc02'
implementation 'androidx.legacy:legacy-support-v4:1.0.0-rc02'
implementation 'androidx.appcompat:appcompat:1.0.0-rc02'
implementation 'androidx.cardview:cardview:1.0.0-rc02'
implementation 'androidx.appcompat:appcompat:1.0.0-rc02'
implementation 'androidx.recyclerview:recyclerview:1.0.0-rc02'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
...
implementation ('com.google.firebase:firebase-messaging:17.3.1'){
exclude group: 'com.android.support', module:'support-v4'
}
}
现在，应用程序已成功编译，但运行时因以下错误而崩溃：
09-18 14:51:46.372 17956-17956/ir.rotbeshoo E/AndroidRuntime: FATAL EXCEPTION: main
Process: ir.rotbeshoo, PID: 17956
java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/util/ArrayMap;
at com.google.firebase.FirebaseApp.<clinit>(com.google.firebase:firebase-common@@16.0.1:136)
at com.google.firebase.FirebaseApp.initializeApp(com.google.firebase:firebase-common@@16.0.1:274)
at com.google.firebase.provider.FirebaseInitProvider.onCreate(com.google.firebase:firebase-common@@16.0.1:37)
at android.content.ContentProvider.attachInfo(ContentProvider.java:1751)
at android.content.ContentProvider.attachInfo(ContentProvider.java:1726)
at com.google.firebase.provider.FirebaseInitProvider.attachInfo(com.google.firebase:firebase-common@@16.0.1:31)
at android.app.ActivityThread.installProvider(ActivityThread.java:6203)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:5721)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5639)
at android.app.ActivityThread.-wrap2(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1637)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:6523)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.util.ArrayMap" on path: DexPathList[[zip file "/data/app/ir.rotbeshoo-1/base.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_dependencies_apk.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_slice_0_apk.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_slice_1_apk.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_slice_2_apk.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_slice_3_apk.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_slice_4_apk.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_slice_5_apk.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_slice_6_apk.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_slice_7_apk.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_slice_8_apk.apk", zip file "/data/app/ir.rotbeshoo-1/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/ir.rotbeshoo-1/lib/arm64, /system/lib64, /vendor/lib64, /system/vendor/lib64, /product/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312