如果出现以下情况,则会出现此问题:
-
我从安卓工作室运行应用程序,该应用程序运行正常
然后我删除了该应用程序并尝试从
.../app/build/outputs/apk/debug.apk
安装调试.apk
我的操作系统是 Ubuntu 16.04,oracle jdk
但在 Windows 7 上一切正常(apk 可以从.../app/build/outputs/apk/debug.apk
安装并正常运行(
发生此错误:
FATAL EXCEPTION: main
Process: com.example, PID: 21084
java.lang.RuntimeException: Unable to instantiate application com.example.MyApp: java.lang.ClassNotFoundException: Didn't find class "com.example.MyApp" on path: DexPathList[[zip file "/data/app/com.example-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example-1/lib/arm, /vendor/lib, /system/lib]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:676)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6289)
at android.app.ActivityThread.access$1800(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1860)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.MyApp" on path: DexPathList[[zip file "/data/app/com.example-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example-1/lib/arm, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newApplication(Instrumentation.java:1004)
at android.app.LoadedApk.makeApplication(LoadedApk.java:666)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6289)
at android.app.ActivityThread.access$1800(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1860)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Suppressed: java.lang.ClassNotFoundException: com.example.MyApp
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 12 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
我的毕业生:
apply plugin: 'com.android.application'
apply plugin: 'me.tatarka.retrolambda'
apply plugin: 'io.fabric'
apply plugin: 'android-apt'
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "com.example"
minSdkVersion 19
targetSdkVersion 25
versionCode 1
versionName "1.0"
multiDexEnabled true
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
jackOptions {
enabled false
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
dexOptions {
javaMaxHeapSize "8g"
jumboMode = true
preDexLibraries = false
}
signingConfigs {
//release
release {
storeFile file("/keys/apk_key.jks")
storePassword "apk_key"
keyAlias "apk_key"
keyPassword "apk_key"
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
signingConfig signingConfigs.release
debuggable false
}
debug {
signingConfig signingConfigs.release
debuggable true
}
}
dexOptions {
javaMaxHeapSize "3G"
}
packagingOptions {
exclude 'LICENSE.txt'
exclude 'mockito-extensions/org.mockito.plugins.MockMaker'
exclude 'META-INF/DEPENDENCIES.txt'
exclude 'META-INF/LICENSE.txt'
exclude 'META-INF/NOTICE.txt'
exclude 'META-INF/NOTICE'
exclude 'META-INF/LICENSE'
exclude 'META-INF/DEPENDENCIES'
exclude 'META-INF/notice.txt'
exclude 'META-INF/license.txt'
exclude 'META-INF/dependencies.txt'
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
...
}
我也试图:
Invalidate Cache/Restart
Clean Project
Rebuild project
@Dileep帕特尔我遇到了同样的问题。应用程序仅在从Android Studio安装时才有效,如果通过adb命令安装,则崩溃。使缓存无效/重新启动并禁用即时运行(Android Studio->首选项->即时运行,取消选中"启用实例运行"(在我的情况下有效。
在应用级别 gradle 中添加 multidex
compile 'com.android.support:multidex:1.0.1'
启用多 DEX
defaultConfig {
multiDexEnabled true
}
最后在应用程序类中添加此代码
@Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(base);
MultiDex.install(this);
}
我只想说我知道这真的很愚蠢,我知道这个问题已经得到了回答,但我更改了我的 App 类的名称并忘记在清单中更改它,出于某种原因,该应用程序仍然构建。无论如何,请确保在项目清单中具有正确的应用类名称:
<application
android:name=".CorrectAppClassHere"
//...
将其添加到gradle对我有帮助
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
如果您的测试设备高于 API 级别 20,则可以将 minSdkVersion 更改为 21,而不是添加 multidex,因为 API 级别 20 及更高版本包含 multidex
我之前尝试过解决清单中 appName 问题的解决方案,所以我在应用程序 gradle 中添加了这一行 manifestPlaceholder = [applicationName: "com.tech.turitos",它既没有解决我的问题,也没有记得删除它,所以一旦我删除它,它就会创建此错误,该应用程序运行正常。
<application
android:name=".App"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
在您的清单文件中,只需将allowBackup
更改为 false。
然后运行该应用程序,您将获得异常。
然后将其改回 true,这将完全修复它。