问题
i got simmilar post but nothing working
i have android studio 2.3.1
gradle version 2.3.1
appcompat-v7:25.3.1
I create a new project by android studio(one that is automatically created by Android Studio(Hello Word)). I haven't write any thing in it.
When i install app using usb via android studio it works perfectly but same app if i open it from it's icon ,i got these errors
One more i noticed that size of apk is 500-600kb ,early it used to be around for hello world(default by android studio) Apk 2.3Mb
FATAL EXCEPTION: main
Process: in.codebucket.check, PID: 32397
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{in.codebucket.check/in.codebucket.check.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "in.codebucket.check.MainActivity" on path: DexPathList[[zip file "/data/app/in.codebucket.check-1/base.apk"],nativeLibraryDirectories=[/data/app/in.codebucket.check-1/lib/x86, /vendor/lib, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.ClassNotFoundException: Didn't find class "in.codebucket.check.MainActivity" on path: DexPathList[[zip file "/data/app/in.codebucket.check-1/base.apk"],nativeLibraryDirectories=[/data/app/in.codebucket.check-1/lib/x86, /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:1067)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2317)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Suppressed: java.lang.ClassNotFoundException: in.codebucket.check.MainActivity
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
My xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="in.codebucket.check.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
My MainActivity
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}}
my Manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="in.codebucket.check">
<application
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
gradle(Module:App)
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "in.codebucket.check"
minSdkVersion 16
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'),
'proguard-rules.pro'
}}}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-
core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
}
gradle(Project)
// Top-level build file where you can add configuration options common to
all sub-projects/modules.
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.3.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
回答1:
Got the solution ,it is happening because of instant run, Just disable it
Goto :
Android Studio --> File --> Setting --> Build, execution, deploy --> Instant run.
回答2:
No need to disable instant run, just remove the app from device/emulator and clean the project and install it again.
回答3:
For me the problem was that the Gradle dependencies wen't matching. Here's what solved it for me:
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion "26.0.0"
defaultConfig {
applicationId "com.and.myApp"
minSdkVersion 19
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags "-fexceptions"
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'jp.wasabeef:blurry:2.1.1'
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support.constraint:constraint-layout:1.0.2'
//noinspection GradleCompatible
compile 'com.android.support:cardview-v7:25.3.1'
compile 'com.android.support:appcompat-v7:26.+'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:design:26.+'
}
回答4:
For me, it is after I add the code to use getFusedLocationProviderClient, I get crashes
process: no.onmyway133.myapp, PID: 10538
java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/api/Api$zzf;
at com.google.android.gms.location.LocationServices.<clinit>(Unknown Source)
at com.google.android.gms.location.LocationServices.getFusedLocationProviderClient(Unknown Source)
at no.onmyway133.myapp.maps.MapsActivity.onCreate(MapsActivity.kt:22)
The problem is the warning in build.gradle, it warns that both should use the same version, otherwise there will be potential for runtime crashes.
So the fix is to specify the same version
implementation 'com.google.android.gms:play-services-maps:15.0.1'
implementation "com.google.android.gms:play-services-location:15.0.1"
来源：https://stackoverflow.com/questions/43448761/class-not-found-using-the-boot-class-loader-no-stack-trace-available