Develop Reference

TensorFlow + AndroidScanner - couldn't find "libopencv_java3.so"

I'm having a problem with combining Tensorflow and AndroidScanner.
I use Tensorflow to display an overlay over the camera feed. I take a picture with the camera, and then send it to a server. It works.
Now I imported the AndroidScannerDemo, I want to use the taken picture and crop/transform it with the newly imported module. It crashes. When I open the ScanActivity (from the AndroidScannerDemo), it tries to load opencv, and never succeeds. The error message is as follows:
FATAL EXCEPTION: main
Process: fr.pacifica.insurancechat.debug, PID: 2139
java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/fr.pacifica.insurancechat.debug-OI_d1EANbiczpZEwAHYdkw==/base.apk"],nativeLibraryDirectories=[/data/app/fr.pacifica.insurancechat.debug-OI_d1EANbiczpZEwAHYdkw==/lib/arm64, /data/app/fr.pacifica.insurancechat.debug-OI_d1EANbiczpZEwAHYdkw==/base.apk!/lib/arm64-v8a, /system/lib64, /system/vendor/lib64]]] couldn't find "libopencv_java3.so"
at java.lang.Runtime.loadLibrary0(Runtime.java:1011)
at java.lang.System.loadLibrary(System.java:1657)
at com.scanlibrary.ScanActivity.(ScanActivity.java:125)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1190)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2837)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3046)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1688)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6809)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
When I delete TensorFlow references from gradle/code, the imported module works just fine.

The project you imported, only builds 32-bit versions of libScanner.so, and therefore only uses the 32-bit versions of libopencv_java3.so. In the short run, you can keep that, only set
android {
defaultConfig {
ndk {
abiFilters 'armeabi-v7a'
}
}
}
This will cause your APK run in 32-bit mode on arm64 devices.
In the long run, you should update the Scanner library to build in 64-bit, too. This may have a significant performance gain.
from August 2019, 64-bit support is required for all apps in Play Store

I had the same problem with some mobiles (64 bits processor)
Here is the libs you need for every single arquitecture. You can download it and import manually.
https://github.com/jhansireddy/AndroidScannerDemo/tree/2cd23d3d362d0a6248cf489a79ebc4ba2c425c60/ScanDemoExample/scanlibrary/src/main/libs

Android app loading ARM shared library on x86 device fails

I have a really simple android app. I want to load a shared library called 'libcamera.so' and then call methods via JNI.
I do not own this library and I do not have access to the source code. It was originally compiled for ARM.
An x86 version is not available.
The project can detect the library and correctly shows it in the jniLibs folder.
Within my main activity I am trying to load the 3rd party library like so:
static {
System.loadLibrary("camera");
}
When this line executes, logcat shows the following:
02-06 14:11:38.517 4455-4455/uk.co.test.myApp E/art: dlopen("/data/app/uk.co.test.myApp-2/lib/x86/libcamera.so", RTLD_LAZY) failed: dlopen failed: "/data/app/uk.co.test.myApp-2/lib/x86/libcamera.so" has unexpected e_machine: 40
02-06 14:11:38.519 4455-4455/uk.co.test.myApp E/AndroidRuntime: FATAL EXCEPTION: main
Process: uk.co.test.myApp, PID: 4455
java.lang.UnsatisfiedLinkError: dlopen failed: "/data/app/uk.co.test.myApp-2/lib/x86/libcamera.so" has unexpected e_machine: 40
at java.lang.Runtime.loadLibrary(Runtime.java:371)
at java.lang.System.loadLibrary(System.java:988)
at uk.co.test.myApp.MainActivity.<clinit>(MainActivity.java:17)
at java.lang.reflect.Constructor.newInstance(Native Method)
at java.lang.Class.newInstance(Class.java:1603)
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:5258)
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)
Other 3rd party apps which use this library can run on my x86 device (Epson BT350) so I feel like this should be possible.
I have become aware of something called 'Houdini' which allows ARM apps to run on x86 - I have checked and my device has this library so im confused why its not doing its job. But its also quite likely I dont really understand how Houdini works!
I have tried running on an x86 emulator - same error.
Any ideas would be greatly appreciated.

I solved the problem by forcing my app to only build an armeabi version. I did this by using an abifilter within gradle. I added the following to my defaultConfig
ndk {
abiFilters "armeabi"
}
This will then run on my x86 device because Houdini will kick in and do the translation. Its not ideal because this translation affects performance - but its a start and gets me to the next stage.

UnsatisfiedLinkError in pjsip library

I build Pjsip library and use its sample in android studio .
question
When I run that i got this error.How could I solve it ? thanks in advance.
exception
jsip.pjsua2.app E/AndroidRuntime: FATAL EXCEPTION: main
Process: org.pjsip.pjsua2.app, PID: 4360
java.lang.UnsatisfiedLinkError: No implementation found for void org.pjsip.pjsua2.pjsua2JNI.swig_module_init() (tried Java_org_pjsip_pjsua2_pjsua2JNI_swig_1module_1init and Java_org_pjsip_pjsua2_pjsua2JNI_swig_1module_1init__)
at org.pjsip.pjsua2.pjsua2JNI.swig_module_init(Native Method)
at org.pjsip.pjsua2.pjsua2JNI.(pjsua2JNI.java:2351)
at org.pjsip.pjsua2.Endpoint.(Endpoint.java:68)
at org.pjsip.pjsua2.app.MyApp.(MyApp.java:296)
at org.pjsip.pjsua2.app.MainActivity.onCreate(MainActivity.java:92)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442)
at android.app.ActivityThread.access$800(ActivityThread.java:156)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:211)
at android.app.ActivityThread.main(ActivityThread.java:5389)
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:1020)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)

It may happen for several reasons. First, check if you attached the native library correctly. For that create a folder named "jniLibs" into the projects
app/src/main/jniLibs
then put your armeabi architecture library like
armeabi/libpjsua2.so
for other architecture like armeabi-v7a use
armeabi-v7a/libpjsua2.so
like this.
there are other reasons may happen. If you build pjsip library for armeabi architecture only and running your application in an x86 architecture device then this error may occur. So check it also if you have built it for that application.

Please take a look at this thread: building pjsua2 dll
the important thing to know here is that the error you show in your question is caused by the fact that the pjsua2.dll (a c++ dll) is not in your output directory.

Android Tesseract App crashes on OCR Function

I am trying to implement Tesseract into my android project but am getting a crash when trying to complete the OCR.
Here is how I'm setting up Tesseract:
TessBaseAPI baseApi = new TessBaseAPI();
baseApi.setDebug(true);
baseApi.init(imagePath, "eng");
baseApi.setImage(bitmap);
String recognizedText = baseApi.getUTF8Text();
baseApi.end();
This is how I'm setting up the image information to pass into the TesseractAPI:
destination = new File(Environment.getExternalStorageDirectory(), name + ".png");
imagePath = destination.getAbsolutePath();
String name = dateToString(new Date(),"yyyy-MM-dd-hh-mm-ss");
Here is the Logcat:
10734-10734/www.rshdev.com.ocr E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: www.rshdev.com.ocr, PID: 10734
java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/www.rshdev.com.ocr-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]] couldn't find "libpngt.so"
at java.lang.Runtime.loadLibrary(Runtime.java:366)
at java.lang.System.loadLibrary(System.java:988)
at com.googlecode.tesseract.android.TessBaseAPI.<clinit>(TessBaseAPI.java:43)
at www.rshdev.com.ocr.MainActivity.ocr(MainActivity.java:140)
at www.rshdev.com.ocr.MainActivity.onActivityResult(MainActivity.java:86)
at android.app.Activity.dispatchActivityResult(Activity.java:6192)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3570)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3617)
at android.app.ActivityThread.access$1300(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1352)
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)

Your tesseract does not crash in the OCR function, it crashes trying to load a library:
java.lang.UnsatisfiedLinkError: ... couldn't find "libpngt.so"
...
at com.googlecode.tesseract.android.TessBaseAPI.<clinit>(TessBaseAPI.java:43)
But line 43 in the source that I have reads:
System.loadLibrary("tess");
therefore it tries to load libtess.so but reports a failure on libpngt.so.
Either:
1) your source code of TessBaseAPI.java is different, it contains System.loadLibrary("pngt"); and that library is missing. Make sure the .apk contains it. Eclipse used to have a misfeature: if your code depends on a library, you configure that dependency for compilation in one place and for delivery in another place. And IIRC .so dependency was specified in a 3rd place.
2) libtess.so is compiled with dynamic linking (try to use static linking then)
3) you are trying to run it in the emulator (try on a real device then).
This is all what can be said from the information you provided.

More info about solution:
I faced with this issue when I moved from Windows to Linux. My Linux had no NDK installed.
I've downloaded it from official source.
Instructions for installing under Linux:
Go to the directory where you downloaded it.
Execute the package. For example:
ndk$ chmod a+x android-ndk-r10c-darwin-x86_64.bin
ndk$ ./android-ndk-r10c-darwin-x86_64.bin
You also need to rebuild tess-two under Linux. Follow the instruction in oficial source.

Make sure that you are using the same gradle version on your project and in the tess lib project. Example:
buildscript {
dependencies {
classpath 'com.android.tools.build:gradle:1.5.0'
}
}
The value on classpath must be equals on both projects.

do not update any gradle aur sdk update... i repeat ..do ignore all
the update if asking and it will work smoothly. Just import the
project of priyankverma######## from github and IGNORE all the
updates ... i am sure you wont get this libpngt.so error.
Download or clone the project
import in android studio
let the gradle and sdk versions as it is and
IGNORE all the UPDATES even it is saying "Strongly Recommended.
simply run the project. :)

Android native library dependency not found

In my Android Studio project I use a third-party library (which I cannot edit) which requires several native libraries. When I access this third-party library in my app, I get the following error:
java.lang.UnsatisfiedLinkError: Couldn't load avutil-52 from
loader dalvik.system.PathClassLoader
[dexPath=/data/app/com.myApp.debug.apk,
libraryPath=/data/app-lib/com.myApp.debug]:
findLibrary returned null
I use Android Studio 1.2.2, so Gradle supports using a jniLibs folder. My Gradle build file specifies the jniLibs folder, for safety:
android {
sourceSets {
main {
java {
srcDir 'src/main/src'
}
jniLibs {
srcDirs 'src/main/jniLibs'
}
}
}
}
And here I have my libraries:
src/main/jniLibs/armeabi/*.so
The folder includes some other libraries, which are working in the app, so I know the folder is being included.
When I inspect the generated APK, all the *.so files are included in the libs folder. However, when I check the installed app, I only find three of the expected six libraries:
adb shell ls /data/app-lib/com.myApp
first.so
second.so
third.so
I've also checked the /data/data/com/myApp.debug/app_lib/ folder, and none of the other three dependencies are there.
Not being a native Android developer, I find this very puzzling. What could be causing some dependencies to be included, and others to be excluded? Is there a way of forcing Android to recognise the three missing files, and making sure they're installed? Without having to edit the third party library which uses them, of course.
EDIT 1:
Could this code from the third-party library be causing a problem?
public StartFunction() {
String arch = System.getProperty("os.arch");
this.ARM = arch.toUpperCase().contains("ARM") || arch.toUpperCase().contains("AARCH64");
if(this.ARM) {
this.LoadLibraries();
}
}
private void LoadLibraries() {
System.loadLibrary("first");
System.loadLibrary("second");
System.loadLibrary("third");
System.loadLibrary("fourth");
System.loadLibrary("fifth");
System.loadLibrary("sixth");
}
EDIT 2:
This is the full exception from logcat. Package names slightly changed to protect the guilty.
06-30 09:19:08.505 15069-15069/com.myApp.debug E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.myApp.debug, PID: 15069
java.lang.UnsatisfiedLinkError: Couldn't load avutil-52 from loader dalvik.system.PathClassLoader[dexPath=/data/app/com.myApp.debug-1.apk,libraryPath=/data/app-lib/com.myApp.debug-1]: findLibrary returned null
at java.lang.Runtime.loadLibrary(Runtime.java:358)
at java.lang.System.loadLibrary(System.java:526)
at com.thirdPartyApp.embedded.Call.LoadLibraries(Call.java:289)
at com.thirdPartyApp.embedded.Call.<init>(Call.java:214)
at com.thirdPartyApp.embedded.thirdPartyCall$29.run(thirdParty.java:963)
at com.thirdPartyApp.embedded.DownloadFile.onPostExecute(DownloadFile.java:56)
at com.thirdPartyApp.embedded.DownloadFile.onPostExecute(DownloadFile.java:16)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5487)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
EDIT 3:
I've managed to get this working, but in a kind of dirty way. I don't know exactly why this happened, but I do know what happened:
I had all six the compiled libraries needed by the third party SDK I'm using placed in src/main/jniLibs/armeabi. Conventional wisdom dictates that this should work for all ARM devices. However, when installing the app on an ARM device only three of the six libraries were installed.
Dirty solution: place all six libraries in the src/main/jniLibs/armeabi-v7a folder as well. This scattershot approach meant that all six libraries are installed, and available.
I'll update this once we figure out why this happened.