当我使用Android版本的API 27时它工作正常，但当我尝试使用API 19运行它时，我收到以下错误：
java.lang.RuntimeException: Unable to get provider com.google.firebase.provider.FirebaseInitProvider: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.provider.FirebaseInitProvider" on path: DexPathList[[zip file "/data/app/se.dxapps.skidspar.beta-1.apk"],nativeLibraryDirectories=[/data/app-lib/se.dxapps.skidspar.beta-1, /vendor/lib, /system/lib]]
at android.app.ActivityThread.installProvider(ActivityThread.java:4793)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:4385)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4325)
at android.app.ActivityThread.access$1500(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.provider.FirebaseInitProvider" on path: DexPathList[[zip file "/data/app/se.dxapps.skidspar.beta-1.apk"],nativeLibraryDirectories=[/data/app-lib/se.dxapps.skidspar.beta-1, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
at android.app.ActivityThread.installProvider(ActivityThread.java:4778)
所以我搜索并尝试了很多建议来解决这个问题，但它们都没有真正起作用。
我的gradle文件：
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion '26.0.2'
dexOptions {
preDexLibraries = false
}
defaultConfig {
applicationId "se.dxapps.skidspar.beta"
minSdkVersion 15
targetSdkVersion 26
testInstrumentationRunner "com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner"
multiDexEnabled true
}
buildTypes {
release {
minifyEnabled false
}
}
lintOptions {
abortOnError false
}
useLibrary 'org.apache.http.legacy'
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:26+'
compile 'com.android.support:mediarouter-v7:26.1.0'
compile 'com.android.support:support-v4:26.1.0'
compile 'com.android.support:design:26.1.0'
compile 'com.google.android.gms:play-services:11.0.0'
compile 'com.google.firebase:firebase-messaging:11.0.0'
compile 'com.crittercism:crittercism-android-agent:+'
compile 'com.felipecsl:gifimageview:2.0.0'
compile 'pl.droidsonroids.gif:android-gif-drawable:1.1.+'
compile 'com.squareup.picasso:picasso:2.5.2'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:multidex:1.0.1'
}
我也改为谷歌gms服务的最新版本。这就是build.gradle文件的样子：
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
google()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.0.1'
classpath 'com.google.gms:google-services:3.1.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
afterEvaluate {
tasks.matching {
it.name.startsWith('dex')
}.each { dx ->
if (dx.additionalParameters == null) {
dx.additionalParameters = ['--multi-dex']
} else {
dx.additionalParameters += '--multi-dex'
}
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
我还在MainActivity中添加了这行代码，以反映不支持DEX的API版本。
@Override
protected void attachBaseContext(Context context) {
super.attachBaseContext(context);
MultiDex.install(this);
}
现在我出于想法，有人有另一个建议，或者可以看到问题可能出在哪里？
编辑我试过并添加了一个包含以下行的multiDexKeepFile：
se/dxapps/skidspar/MainActivity.class
com/google/firebase/provider/FirebaseInitProvider.class
并将其放在build.gradle中
buildTypes {
release {
multiDexKeepFile file('multidex_keep_file.txt')
minifyEnabled false
}
debug{
multiDexKeepFile file('multidex_keep_file.txt')
}
}
执行并运行应用程序后，我收到此错误：
Could not find method com.google.firebase.FirebaseApp.initializeApp, referenced from method com.google.firebase.provider.FirebaseInitProvider.onCreate
12-17 12:16:40.270 4325-4325/se.dxapps.skidspar.beta W/dalvikvm: VFY: unable to resolve static method 19752: Lcom/google/firebase/FirebaseApp;.initializeApp (Landroid/content/Context;)Lcom/google/firebase/FirebaseApp;
12-17 12:16:40.270 4325-4325/se.dxapps.skidspar.beta D/dalvikvm: VFY: replacing opcode 0x71 at 0x0004
12-17 12:16:40.270 4325-4325/se.dxapps.skidspar.beta D/AndroidRuntime: Shutting down VM
12-17 12:16:40.270 4325-4325/se.dxapps.skidspar.beta W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x9cca1b20)
12-17 12:16:40.270 4325-4325/se.dxapps.skidspar.beta E/AndroidRuntime: FATAL EXCEPTION: main
Process: se.dxapps.skidspar.beta, PID: 4325
java.lang.NoClassDefFoundError: com.google.firebase.FirebaseApp
at com.google.firebase.provider.FirebaseInitProvider.onCreate(Unknown Source)
Multidex需要更多的构建时间和决策，可能会排除某些文件。尝试使用multiDexKeepFile或multiDexKeepProguard属性来防止它们被排除在外。阅读this。