问题
My app is deployed directly to any device without any exception. But when .apk is installed it throws the following exception. Secondly it runs fine with Nougat 7.0 and above versions but crashes with same exception for lower OS Versions like 5.0 and 6.0. etc. What is the reason for exception ?
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="amitechnologies.products.apps.equalizeraudioplayer.v3" >
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.BATTERY_STATS" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity
android:name="amitechnologies.products.apps.equalizeraudioplayer.v3.view.LoaderOfAllMediaFiles"
android:label="@string/app_name"
android:configChanges="keyboard|keyboardHidden|orientation|screenSize" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="amitechnologies.products.apps.equalizeraudioplayer.v3.view.MainActivity"
android:screenOrientation="sensorPortrait"
android:configChanges="keyboard|keyboardHidden|orientation|screenSize"
android:label="@string/app_name" >
</activity>
</application>
</manifest>
Build.gradle:
apply plugin: 'com.android.application'
android {
signingConfigs {
config {
keyAlias 'm-zaes'
keyPassword 'm-zaes'
storeFile file('D:/AMI_Repo/AMI_Designer/Targets/Android/AMI 3d Player v3/keystore.jks')
storePassword 'm-zaes'
}
}
compileSdkVersion 25
buildToolsVersion "25.0.1"
useLibrary 'org.apache.http.legacy'
defaultConfig {
applicationId "amitechnologies.products.apps.equalizeraudioplayer.v3"
minSdkVersion 17
targetSdkVersion 25
versionCode 1
versionName "1.1"
signingConfig signingConfigs.config
// Enabling multidex support.
multiDexEnabled true
}
buildTypes {
release {
minifyEnabled false
proguardFile 'D:/AMI_Repo/AMI_Designer/Targets/Android/AMI 3d Player v3/app/proguard-android.txt'
signingConfig signingConfigs.config
}
}
sourceSets {
main {
jniLibs.srcDir 'jniLibs'
}
}
repositories {
maven { url "https://jitpack.io" }
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.google.android.gms:play-services-ads:10.2.4'
compile 'com.google.apis:google-api-services-youtube:v3-rev180-1.22.0'
compile 'com.android.support:multidex:1.0.1'
//glide
compile 'com.github.bumptech.glide:glide:3.7.0'
// CardView
compile 'com.android.support:cardview-v7:25.3.1'
}
productFlavors {
}
}
dependencies {
}
and Stack trace is
Process: amitechnologies.products.apps.equalizeraudioplayer.v3, PID: 15548
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{amitechnologies.products.apps.equalizeraudioplayer.v3/amitechnologies.products.apps.equalizeraudioplayer.v3.view.LoaderOfAllMediaFiles}: java.lang.ClassNotFoundException: Didn't find class "amitechnologies.products.apps.equalizeraudioplayer.v3.view.LoaderOfAllMediaFiles" on path: DexPathList[[zip file "/data/app/amitechnologies.products.apps.equalizeraudioplayer.v3-1/base.apk"],nativeLibraryDirectories=[/data/app/amitechnologies.products.apps.equalizeraudioplayer.v3-1/lib/arm, /vendor/lib, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2395)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2564)
at android.app.ActivityThread.access$800(ActivityThread.java:170)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1441)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5576)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:955)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:750)
Caused by: java.lang.ClassNotFoundException: Didn't find class "amitechnologies.products.apps.equalizeraudioplayer.v3.view.LoaderOfAllMediaFiles" on path: DexPathList[[zip file "/data/app/amitechnologies.products.apps.equalizeraudioplayer.v3-1/base.apk"],nativeLibraryDirectories=[/data/app/amitechnologies.products.apps.equalizeraudioplayer.v3-1/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.newActivity(Instrumentation.java:1070)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2385)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2564)
at android.app.ActivityThread.access$800(ActivityThread.java:170)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1441)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5576)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:955)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:750)
Suppressed: java.lang.ClassNotFoundException: amitechnologies.products.apps.equalizeraudioplayer.v3.view.LoaderOfAllMediaFiles
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)
... 13 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
and Folder Structure:
回答1:
As Discussion in chat i found that, Your manual way of generating APK is not generating the correct APK, so i am Suggesting these way to generating APK for Manual Install:
For Debug Build
- Delete you build folder inside the App folder.
- Goto
Build>Build APk. it will generate .apk file in yourapp>build>output>apkdirectory. - COPY it your device and install manually.
For Release Build
- Delete you build folder inside the App folder.
- Goto
Build>Generate Signed APkand provide recomended Details, make sure yourBuild type : releaseand have checked both signature versionv1(jar signature)andv2(full apk signature). it will generate .apk file in yourapp>build>output>apkdirectory. - COPY it your device and install manually.
回答2:
At first "Clean" and "Sync Project with Gradle Files". Then run your code
回答3:
Replace this
<activity
android:name="amitechnologies.products.apps.equalizeraudioplayer.v3.view.LoaderOfAllMediaFiles"
</activity>
with this
<activity
android:name=".amitechnologies.products.apps.equalizeraudioplayer.v3.view.LoaderOfAllMediaFiles"
</activity>
The reason is you have missed a dot(.) in android:name
回答4:
If your minSDK version less than 21 you need to do the following for multidex
build.gradle
android {
defaultConfig {
...
minSdkVersion 15
targetSdkVersion 25
multiDexEnabled true
}
...
}
dependencies {
compile 'com.android.support:multidex:1.0.1'
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="your_app_package">
<application
android:name="android.support.multidex.MultiDexApplication" >
...
</application>
</manifest>
回答5:
Delete your Build folder inside the app folder and rebuild your project
来源：https://stackoverflow.com/questions/44543270/unable-to-instantiate-activity-component-info-class-not-found-exception-android