Application not installed using apk but install via android studio

Question

I have designed 2 to 3 application in android studio 2.3.1 and gradle 3.2. and all are working fine when i run application from it to any device or emulator. but when i get that apk from build folder and install manually to device or emulator. its crashes everytime and give me error classnotfound. which is MainActivity.

I am using Mac.I tried many ways. even i build new project but still same error. below is logcat of it.

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.call.unblock/com.call.unblock.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.call.unblock.MainActivity" on path: DexPathList[[zip file "/data/app/com.call.unblock-2/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2236)
                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
                                                     at android.app.ActivityThread.access$800(ActivityThread.java:151)
                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
                                                     at android.os.Handler.dispatchMessage(Handler.java:102)
                                                     at android.os.Looper.loop(Looper.java:135)
                                                     at android.app.ActivityThread.main(ActivityThread.java:5254)
                                                     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:903)
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
                                                  Caused by: java.lang.ClassNotFoundException: Didn't find class "com.call.unblock.MainActivity" on path: DexPathList[[zip file "/data/app/com.call.unblock-2/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
                                                     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:1066)
                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2226)
                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
                                                     at android.app.ActivityThread.access$800(ActivityThread.java:151) 
                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
                                                     at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                     at android.os.Looper.loop(Looper.java:135) 
                                                     at android.app.ActivityThread.main(ActivityThread.java:5254) 
                                                     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:903) 
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
                                                    Suppressed: java.lang.ClassNotFoundException: com.call.unblock.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)
                                                            ... 13 more
                                                  Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

Help me with it. i can't go further with my application without solving this issue.

Is it possible you copied an invalid artifact? [Seems like this should work](http://stackoverflow.com/a/16709979/1790644). Try cleaning / rebuilding the project? Or [does this help](http://stackoverflow.com/a/20924305/1790644)? — Matt Clark, May 19 '17 at 17:00

score 1 · Answer 1 · answered May 19 '17 at 18:18

is this a release build type / are you using proguard? if this is the case try using the 'keep' option in proguard-project.txt file... if this is a debug build type - try performing a decompiling of your apk (using 'apktool' for ex.) & check if the specified class is in your 'classes.jar' file

score 0 · Answer 2 · answered Jun 07 '17 at 14:02

if code clean and re-build project is not working then that issue is in Android Studio bundle, you can import same Source code in another system it will work without any issue. i face the same issue previously two three times but by setting code on another system same code without changes works perfectly

Application not installed using apk but install via android studio

2 Answers2