我正在开发一个聊天应用程序,它适用于Android 21非常好,但在SDK低21作为18或19导致此问题
11-03 01:49:22.676 20966-20966 / E / AndroidRuntime:FATAL EXCEPTION:main进程:,PID:20966 java.lang.RuntimeException:无法实例化应用程序.Application:java.lang.ClassNotFoundException:未找到路径上的类“.Application”:DexPathList [[zip文件“/data/app/d-9.apk"],nativeLibraryDirectories=[/data/app-lib/-9,/ vendor / lib,/ system / lib]在android.app.A.运行时,Android.app.A活动时,我在Android.app.A.运行了Android.app.A活动 . app.ActivityThread $ H.handleMessage(ActivityThread.java:1368)位于android.app.ActivityThread的android.os.Handler.dispatchMessage(Handler.java:102)android.os.Looper.loop(Looper.java:146) .main(ActivityThread.java:5602)at java.lang.reflect.Method.invokeNative(Native Method)at java.lang.reflect.Method.invoke(Method.java:515)at com.android.internal.os.ZygoteInit com.a上的$ MethodAndArgsCaller.run(ZygoteInit.java:1283) nalroid.internal.os.ZygoteInit.main(ZygoteInit.java:1099)at dalvik.system.NativeStart.main(Native Method)引起:java.lang.ClassNotFoundException:未找到类“dev.karim.dardesh.Application” “在路径上:DexPathList [[zip文件”/data/app/dev.karim.dardesh-9.apk"],nativeLibraryDirectories=[/data/app-lib/dev.karim.dardesh-9,/ vendor / lib, / system / lib]]在java.lang.ClassLoader.loadClass的java.lang.ClassLoader.loadClass(ClassLoader.java:497)中的dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:67)(ClassLoader.java:457 )在android.app.Instrumentation.newApplication(Instrumentation.java:981)android.app.LoadedApk.makeApplication(LoadedApk.java:511)android.app.ActivityThread.handleBindApplication(ActivityThread.java:4703)android.app .ActivityThread.access $ 1600(ActivityThread.java:175)在android.app.Looper上android.app.Handler.dispatchMessage(Handler.java:102)的android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1368) .loop(Looper.java:146)at和roid.app.ActivityThread.main(ActivityThread.java:5602)位于com.android的java.lang.reflect.Method.invoke(Method.java:515)的java.lang.reflect.Method.invokeNative(Native Method)中 . 在dalvik.system.NativeStart.main(本地方法)的com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)中的internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1283)
我在应用程序类上重写了 Attachbasecontext
public class Application extends android.app.Application{
@Override
public void onCreate() {
super.onCreate();
Firebase.setAndroidContext(this);
}
@Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(base);
MultiDex.install(this);
}
}
并在gradle文件中使用:
multiDexEnabled true
compile 'com.android.support:multidex:1.0.1'
这个gradle文件:
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "24.0.3"
defaultConfig {
applicationId "pakage.com"
minSdkVersion 17
targetSdkVersion 24
versionCode 18
versionName "18"
multiDexEnabled true
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
jackOptions {
enabled true
additionalParameters('jack.incremental': 'true')
}
}
compileOptions {
incremental true
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
dexOptions {
preDexLibraries = false
javaMaxHeapSize '4096m'
}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
packagingOptions {
exclude 'META-INF/LICENSE'
exclude 'META-INF/NOTICE'
exclude 'META-INF/LICENSE-FIREBASE.txt'
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.firebase:firebase-client-android:2.3.1'
compile 'com.android.support:design:24.2.1'
compile 'com.android.support:recyclerview-v7:24.2.1'
compile 'com.android.support:cardview-v7:24.2.1'
compile 'com.squareup.picasso:picasso:2.5.0'
compile 'com.android.support:support-v4:24.2.1'
compile 'com.google.android.gms:play-services-ads:9.8.0'
compile 'com.google.firebase:firebase-messaging:9.8.0'
compile 'com.google.firebase:firebase-auth:9.8.0'
compile 'com.google.android.gms:play-services:9.8.0'
compile 'com.google.firebase:firebase-core:9.8.0'
compile 'com.google.firebase:firebase-database:9.8.0'
compile 'com.android.support:multidex:1.0.1'
testCompile 'junit:junit:4.12'
compile 'com.google.android:support-v4:r7'
}
apply plugin: 'com.google.gms.google-services'
另外我的项目处理firebase实时数据库:
提示/这里没有任何解决方案解决我:
请帮我
3 回答
当我将Android Studio更新为3.0时,我遇到了同样的问题 . 如果您也这样做,请使用2.3版本 . 为我工作!!
请查看本指南以扩展Application和MultiDex:https://developer.android.com/studio/build/multidex.html
它说:
我对其他ClassNotFound和多dex问题的回答是:Why is my custom ButtonRenderer not working?
Api 21有所不同,因为:
加
到你的应用程序级build.gradle