(TensorflowLite/Android) Unable to instantiate activity ComponentInfo

Question

I run a Tensorflow example ( https://github.com/tensorflow/examples/blob/master/lite/examples/image_classification/android/README.md ) on android studio and I get the following error.

E/AndroidRuntime: FATAL EXCEPTION: main Process: org.tensorflow.lite.examples.classification, PID: 18855 java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{org.tensorflow.lite.examples.classification/org.tensorflow.lite.examples.classification.ClassifierActivity}: java.lang.ClassNotFoundException: Didn't find class "org.tensorflow.lite.examples.classification.ClassifierActivity" on path: DexPathList[[zip file "/data/app/org.tensorflow.lite.examples.classification-1/base.apk"],nativeLibraryDirectories=[/data/app/org.tensorflow.lite.examples.classification-1/lib/arm64, /data/app/org.tensorflow.lite.examples.classification-1/base.apk,/lib/arm64-v8a, /system/lib64. /vendor/lib64]] at android.app.ActivityThread.performLaunchActivity(ActivityThread:java.2625) at android.app.ActivityThread.handleLaunchActivity(ActivityThread:java.2784) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread:java.1523) at android.os.Handler.dispatchMessage(Handler:java.102) at android.os.Looper.loop(Looper:java.163) at android.app.ActivityThread.main(ActivityThread:java.6238) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygo teInit$MethodAndArgsCaller.run(ZygoteInit:java.933) at com.android.internal.os.ZygoteInit.main(ZygoteInit:java:823) Caused by. java.lang:ClassNotFoundException. Didn't find class "org.tensorflow.lite.examples.classification:ClassifierActivity" on path. DexPathList[[zip file "/data/app/org.tensorflow.lite.examples.classification-1/base,apk"].nativeLibraryDirectories=[/data/app/org.tensorflow.lite.examples,classification-1/lib/arm64. /data/app/org.tensorflow.lite.examples.classification-1/base,apk,/lib/arm64-v8a. /system/lib64. /vendor/lib64]] at dalvik.system.BaseDexClassLoader:findClass(BaseDexClassLoader.java.56) at java.lang.ClassLoader:loadClass(ClassLoader.java.380) at java.lang.ClassLoader:loadClass(ClassLoader.java.312) at android.app.Instrumentation:newActivity(Instrumentation.java.1079) at android.app.ActivityThread:performLaunchActivity(ActivityThread.java.2615) at android.app.ActivityThread:handleLaunchActivity(ActivityThread.java.2784) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H:handleMessage(ActivityThread.java.1523) at ZC31B32364CE19CA8FCD150A417ECCE5 8Z.os.Handler:dispatchMessage(Handler.java.102) at android.os.Looper:loop(Looper.java.163) at android.app.ActivityThread:main(ActivityThread.java.6238) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller:run(ZygoteInit.java.933) at com.android.internal.os.ZygoteInit:main(ZygoteInit:java.823) I/Process: Sending signal: PID: 18855 SIG: 9

Answer 1

If you download the project from github it has many subfolders that you don't need and some of them that you shouldn't use (eg. ios related folders). If you want to run the android version then in Android studio try to open the project not from the master folder, but from the following subpath:

examples-master/lite/examples/image_classification/android

then let gradle download all dependencies and build your project ( Build -> Make Project ). If you're getting a "Select SDK" error when you're trying to run it, just do a File-> Sync project with gradle files and you should be able to run it just fine after that!