Develop Reference

Eclipse and "Installation failed due to invalid APK file"

I am combining OpenCV with tess-two to make an Android OCR application. It worked perfectly well with OpenCV4Android + custom JNI OpenCV libraries, until I started importing tess-two library. It compiles but does not install:
[2015-08-02 14:43:02 - OpenCV Tutorial 2 - Mixed Processing] Installation failed due to invalid APK file!
[2015-08-02 14:43:02 - OpenCV Tutorial 2 - Mixed Processing] Please check logcat output for more details.
[2015-08-02 14:43:02 - OpenCV Tutorial 2 - Mixed Processing] Launch canceled!
Other posts suggest it's library and reference errors. Indeed, it can install again when I remove ..\tess-two in Properties->Android->Library. Also the tess-two library is compiled correctly, because I sueccesfully compiled and an example project.
And here is the logcat.
08-02 14:46:07.775: D/AndroidRuntime(14699): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
08-02 14:46:07.775: D/AndroidRuntime(14699): CheckJNI is OFF
08-02 14:46:07.785: D/dalvikvm(14699): Trying to load lib libjavacore.so 0x0
08-02 14:46:07.795: D/dalvikvm(14699): Added shared lib libjavacore.so 0x0
08-02 14:46:07.805: D/dalvikvm(14699): Trying to load lib libnativehelper.so 0x0
08-02 14:46:07.805: D/dalvikvm(14699): Added shared lib libnativehelper.so 0x0
08-02 14:46:07.835: E/cutils-trace(14699): Error opening trace file: No such file or directory (2)
08-02 14:46:08.005: D/AndroidRuntime(14699): Calling main entry com.android.commands.pm.Pm
08-02 14:46:08.015: D/zipro(9906): Zip: EOCD not found, /data/local/tmp/OpenCV Tutorial 2 - Mixed Processing.apk is not zip
08-02 14:46:08.015: D/asset(9906): failed to open Zip archive '/data/local/tmp/OpenCV Tutorial 2 - Mixed Processing.apk'
08-02 14:46:08.015: W/PackageParser(9906): Unable to read AndroidManifest.xml of /data/local/tmp/OpenCV Tutorial 2 - Mixed Processing.apk
08-02 14:46:08.015: W/PackageParser(9906): java.io.FileNotFoundException: AndroidManifest.xml
08-02 14:46:08.015: W/PackageParser(9906): at android.content.res.AssetManager.openXmlAssetNative(Native Method)
08-02 14:46:08.015: W/PackageParser(9906): at android.content.res.AssetManager.openXmlBlockAsset(AssetManager.java:522)
08-02 14:46:08.015: W/PackageParser(9906): at android.content.res.AssetManager.openXmlResourceParser(AssetManager.java:478)
08-02 14:46:08.015: W/PackageParser(9906): at android.content.pm.PackageParser.parsePackageLite(PackageParser.java:787)
08-02 14:46:08.015: W/PackageParser(9906): at com.android.defcontainer.DefaultContainerService$1.getMinimalPackageInfo(DefaultContainerService.java:174)
08-02 14:46:08.015: W/PackageParser(9906): at com.android.internal.app.IMediaContainerService$Stub.onTransact(IMediaContainerService.java:110)
08-02 14:46:08.015: W/PackageParser(9906): at android.os.Binder.execTransact(Binder.java:388)
08-02 14:46:08.015: W/PackageParser(9906): at dalvik.system.NativeStart.run(Native Method)
08-02 14:46:08.015: W/DefContainer(9906): Failed to parse package
08-02 14:46:08.025: W/ActivityManager(455): No content provider found for permission revoke: file:///data/local/tmp/OpenCV Tutorial 2 - Mixed Processing.apk

I added
<uses-sdk android:minSdkVersion="11"
android:targetSdkVersion="15"/>
to AndroidManifest.xml in both the project and the tess-two library. Everything worked.

RenderScript No JNI_OnLoad found error

I am using renderscript library in my project and I perfectly run my apk on Samsung S4 I9500. But when I tried this in other phones I get crash.
No JNI_OnLoad found in /system/lib/libRSSupport.so 0x4185f0f0, skipping init
02-23 19:42:40.370 8994-8994/com.example.gameboy.gununtesti E/dalvikvm﹕ ERROR: couldn't find native method
02-23 19:42:40.370 8994-8994/com.example.gameboy.gununtesti E/dalvikvm﹕ Requested: Landroid/support/v8/renderscript/RenderScript;._nInit:()V
02-23 19:42:40.370 8994-8994/com.example.gameboy.gununtesti E/JNIHelp﹕ RegisterNatives failed for 'android/support/v8/renderscript/RenderScript', aborting
02-23 19:42:40.370 8994-8994/com.example.gameboy.gununtesti A/libc﹕ Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 8994
Any help appreciated. Thanks.

You forgot to include libRSSupport.so + the other native libraries in your .apk. This is attempting to load the system version of the compatibility, library, which will not work with your app.

onJNILoad not being called when calling System.loadLibrary

I have add a print log statement in JNI_OnLoad, but I found that it is not being called. Here is my JNI_OnLoad method.
extern "C" JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved) {
__android_log_print(ANDROID_LOG_INFO, __FUNCTION__, "onLoad");
// some init code
}
Do I need to declare JNI_OnLoad in a specific file or declare sth in Android.MK tells system where to find the JNI_OnLoad method? Now I just put to one of the many .cpp files.
compiled .so lib is attached. I try to dump the so file, and I am sure the JNI_OnLoad method is exported.
https://docs.google.com/file/d/0B089WeEZXTb3ZjZiQllaYThuUUk/edit
Actually, I am trying to port a library from android source (libcorejava.so). To avoid class path conflict, I already change the class path.
And here is the file that declares JNI_OnLoad:
https://android.googlesource.com/platform/libcore/+/master/luni/src/main/native/Register.cpp
I already change the signature to the above one in order to match the standard signature
EDIT:
I found that android source does not load it by System.loadLibrary! It says libcorejava is used to implement System.loadLibrary, so we cannot use System.loadLibrary to load it. But in my case, it should not be a problem as I only need part of the function (ICU related).
https://android.googlesource.com/platform/dalvik/+/master/vm/Init.cpp
// Most JNI libraries can just use System.loadLibrary, but you can't
// if you're the library that implements System.loadLibrary!
loadJniLibrary("javacore");
loadJniLibrary("nativehelper");
EDIT 2:
It turns out that it is because the name conflict of the library!
But it seems that libjavacore requires other library. Does there any tool that can list out what the dependency I am missing?
java.lang.UnsatisfiedLinkError: Cannot load library: reloc_library[1286]: XXX
EDIT 3:
TextClock is a new api for displaying time. It only exists in 4.2+ api up. I am trying to backport it so that older sdk can uses it. It depends on a ICU library which resides in libjavacore. So I modify the Android.mk file to make sure the libjavacore only include the icu related source file and the final compiled so file is being included in my apk.
TextClock:
http://developer.android.com/reference/android/widget/TextClock.html
It now works in the phone which originally support TextClock, but doesn't work in old devices. Here is the exception log. I think it is because libjavacore is the wrapper of ICU library. Apart from the wrapper, I still need to port the ICU library. But I am going to give up as the size of ICU library is quite large and seems doesn't worth for it...
12-13 14:07:54.859: E/AndroidRuntime(2091): java.lang.UnsatisfiedLinkError: Cannot load library: reloc_library[1306]: 36 cannot locate '_ZN6icu_516Locale14createFromNameEPKc'...
12-13 14:07:54.859: E/AndroidRuntime(2091): at java.lang.Runtime.loadLibrary(Runtime.java:370)
12-13 14:07:54.859: E/AndroidRuntime(2091): at java.lang.System.loadLibrary(System.java:535)
12-13 14:07:54.859: E/AndroidRuntime(2091): at com.example.time.MainActivity.onCreate(MainActivity.java:20)
12-13 14:07:54.859: E/AndroidRuntime(2091): at android.app.Activity.performCreate(Activity.java:5008)
12-13 14:07:54.859: E/AndroidRuntime(2091): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
12-13 14:07:54.859: E/AndroidRuntime(2091): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
12-13 14:07:54.859: E/AndroidRuntime(2091): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
12-13 14:07:54.859: E/AndroidRuntime(2091): at android.app.ActivityThread.access$600(ActivityThread.java:130)
12-13 14:07:54.859: E/AndroidRuntime(2091): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
12-13 14:07:54.859: E/AndroidRuntime(2091): at android.os.Handler.dispatchMessage(Handler.java:99)
12-13 14:07:54.859: E/AndroidRuntime(2091): at android.os.Looper.loop(Looper.java:137)
12-13 14:07:54.859: E/AndroidRuntime(2091): at android.app.ActivityThread.main(ActivityThread.java:4745)
12-13 14:07:54.859: E/AndroidRuntime(2091): at java.lang.reflect.Method.invokeNative(Native Method)
12-13 14:07:54.859: E/AndroidRuntime(2091): at java.lang.reflect.Method.invoke(Method.java:511)
12-13 14:07:54.859: E/AndroidRuntime(2091): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
12-13 14:07:54.859: E/AndroidRuntime(2091): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-13 14:07:54.859: E/AndroidRuntime(2091): at dalvik.system.NativeStart.main(Native Method)

You can dump the symbols in your .so file using readelf in your toolchains folder. Check to see that JNI_OnLoad is exported. The -s (symbols) command and the name of the .so file in your libs folder should do it.

In older releases of Android, the library was linked directly into the VM (libdvm.so linked against libnativehelper.so which linked against libjavacore.a). In recent releases this changed to always load the library at start time, using the internal native library load mechanism, so JNI_OnLoad will be called if present.
If I run adb shell dalvikvm Foo (where "Foo" doesn't exist), I see this in logcat:
D dalvikvm: Trying to load lib libjavacore.so 0x0
D dalvikvm: Added shared lib libjavacore.so 0x0
D dalvikvm: Trying to load lib libnativehelper.so 0x0
D dalvikvm: Added shared lib libnativehelper.so 0x0
D dalvikvm: No JNI_OnLoad found in libnativehelper.so 0x0, skipping init
So it loaded libjavacore.so and apparently found and ran JNI_OnLoad (no news is good news). It loaded libnativehelper.so and didn't find a JNI_OnLoad, so it logged a message to tell you so in case you were expecting otherwise.
If you replace the libjavacore.so in /system/lib (on a rooted device), and run the dalvikvm command, you should see your message in the log file, mixed in with messages like I've shown above. If you restart the system, you should see your message during zygote startup, and not again unless something runs a Dalvik-based command (like am).

Error: failed to register for push notifications (Appcelerator pushwoosh module for android)

I keep getting "Failed to register for push notifications" when using the pushwoosh android appcelerator module. (working great on iOS tho!)
here's my trace
[INFO][ActivityManager( 60)] Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.omgmediagroup.attProAm/.ComOmgmediagroupAttproamActivity }
[INFO][ActivityManager( 60)] Start proc com.omgmediagroup.attProAm for activity com.omgmediagroup.attProAm/.ComOmgmediagroupAttproamActivity: pid=255 uid=10041 gids={3003, 1015}
[INFO][TiApplication( 255)] (main) [0,0] checkpoint, app created.
[DEBUG][dalvikvm( 255)] GC_FOR_MALLOC freed 2660 objects / 309088 bytes in 63ms
[INFO][TiApplication( 255)] (main) [494,494] Titanium 2.1.4 (2012/11/09 12:47 51f2c64)
[DEBUG][dalvikvm( 255)] GC_FOR_MALLOC freed 2402 objects / 434296 bytes in 64ms
[INFO][TiApplication( 255)] (main) [368,862] Titanium Javascript runtime: v8
[DEBUG][dalvikvm( 255)] Trying to load lib /data/data/com.omgmediagroup.attProAm/lib/libstlport_shared.so 0x44ede650
[DEBUG][dalvikvm( 255)] Added shared lib /data/data/com.omgmediagroup.attProAm/lib/libstlport_shared.so 0x44ede650
[DEBUG][dalvikvm( 255)] No JNI_OnLoad found in /data/data/com.omgmediagroup.attProAm/lib/libstlport_shared.so 0x44ede650, skipping init
[DEBUG][dalvikvm( 255)] Trying to load lib /data/data/com.omgmediagroup.attProAm/lib/libkroll-v8.so 0x44ede650
[DEBUG][PushnotificationsModule( 255)] (main) [69,931] inside onAppCreate
[INFO][TiRootActivity( 255)] (main) [0,0] checkpoint, on root activity create, savedInstanceState: null
[DEBUG][dalvikvm( 255)] Added shared lib /data/data/com.omgmediagroup.attProAm/lib/libkroll-v8.so 0x44ede650
[ERROR][TiApplication( 255)] (KrollRuntimeThread) [1615,1615] APP PROXY: ti.modules.titanium.app.AppModule#44f06eb8
[WARN][V8Object( 255)] Runtime disposed, cannot set property 'userAgent'
[DEBUG][dalvikvm( 255)] Trying to load lib /data/data/com.omgmediagroup.attProAm/lib/libcom.arellomobie.push.so 0x44ede650
[DEBUG][dalvikvm( 255)] Added shared lib /data/data/com.omgmediagroup.attProAm/lib/libcom.arellomobie.push.so 0x44ede650
[DEBUG][dalvikvm( 255)] No JNI_OnLoad found in /data/data/com.omgmediagroup.attProAm/lib/libcom.arellomobie.push.so 0x44ede650, skipping init
[DEBUG][dalvikvm( 255)] Trying to load lib /data/data/com.omgmediagroup.attProAm/lib/libti.admob.so 0x44ede650
[DEBUG][dalvikvm( 255)] Added shared lib /data/data/com.omgmediagroup.attProAm/lib/libti.admob.so 0x44ede650
[DEBUG][dalvikvm( 255)] No JNI_OnLoad found in /data/data/com.omgmediagroup.attProAm/lib/libti.admob.so 0x44ede650, skipping init
[INFO][ActivityManager( 60)] Starting activity: Intent { cmp=com.omgmediagroup.attProAm/ti.modules.titanium.ui.TiTabActivity (has extras) }
[INFO][TiAPI ( 255)] module is => [object Object]
[DEBUG][dalvikvm( 255)] GC_FOR_MALLOC freed 4127 objects / 477808 bytes in 68ms
[WARN][System.err( 255)] java.lang.IllegalStateException: No receiver for package com.omgmediagroup.attProAm
[WARN][System.err( 255)] at com.google.android.gcm.GCMRegistrar.checkManifest(GCMRegistrar.java:143)
[WARN][System.err( 255)] at com.arellomobile.android.push.PushManager.onStartup(PushManager.java:102)
[WARN][System.err( 255)] at com.arellomobile.android.push.PushManager.onStartup(PushManager.java:87)
[WARN][System.err( 255)] at com.arellomobile.push.PushnotificationsModule.pushNotificationsRegister(PushnotificationsModule.java:79)
[WARN][System.err( 255)] at org.appcelerator.kroll.runtime.v8.V8Runtime.nativeRunModule(Native Method)
[WARN][System.err( 255)] at org.appcelerator.kroll.runtime.v8.V8Runtime.doRunModule(V8Runtime.java:146)
[WARN][System.err( 255)] at org.appcelerator.kroll.KrollRuntime.handleMessage(KrollRuntime.java:287)
[WARN][System.err( 255)] at org.appcelerator.kroll.runtime.v8.V8Runtime.handleMessage(V8Runtime.java:172)
[WARN][System.err( 255)] at android.os.Handler.dispatchMessage(Handler.java:95)
[WARN][System.err( 255)] at android.os.Looper.loop(Looper.java:123)
[WARN][System.err( 255)] at org.appcelerator.kroll.KrollRuntime$KrollRuntimeThread.run(KrollRuntime.java:109)
[ERROR][TiAPI ( 255)] Error during registration: Failed to register for push notifications
Still new at this so I don't quite understand what this log is telling me... obviously there is some kind of conflict with the module and the compiler (i think?)
I've followed the tutorial to a T and can't seem to find any more information on the error.
Is there anyone out there in the wild who has gotten pushwoosh android module for appcelerator to work? Would appreciate any tips.

Embarrassing, but user error within the AndroidManifest.xml file under platforms/android dir.
The instructions (http://www.pushwoosh.com/programming-push-notification/appcelerator-titanium-android-push-notification/) are however somewhat vague - rather than putting the excerpts under the tag make sure you're putting it within the existing tag.
EX:
<application>
snippet here
</application>

libs suddenly won't load in dynamic linker (NDK)

I've been developing an NDK app for quite some time and it's been working well. However, today the app randomly decided to not start anymore, after I compiled it after making some nominal change. It's caused by a cryptic problem with loading the app's main library. Here's some log output:
08-11 18:38:11.220 D/dalvikvm( 1237): Added shared lib /mnt/asec/com.audia.rta-1/lib/libqtandroid.so 0x40513bd8
08-11 18:38:11.220 D/dalvikvm( 1237): No JNI_OnLoad found in /mnt/asec/com.audia.rta-1/lib/libqtandroid.so 0x40513bd8, skipping init
08-11 18:38:11.220 D/dalvikvm( 1237): Trying to load lib /mnt/asec/com.audia.rta-1/lib/librta.so 0x40513bd8
08-11 18:38:11.260 D/AndroidRuntime( 1237): Shutting down VM
08-11 18:38:11.260 W/dalvikvm( 1237): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-11 18:38:11.260 E/AndroidRuntime( 1237): FATAL EXCEPTION: main
08-11 18:38:11.260 E/AndroidRuntime( 1237): java.lang.UnsatisfiedLinkError: Cannot load library: reloc_library[1311]: 67 cannot locate '_ZNSaIcEC1Ev'...
08-11 18:38:11.260 E/AndroidRuntime( 1237):
08-11 18:38:11.260 E/AndroidRuntime( 1237): at java.lang.Runtime.loadLibrary(Runtime.java:434)
08-11 18:38:11.260 E/AndroidRuntime( 1237): at java.lang.System.loadLibrary(System.java:554)
08-11 18:38:11.260 E/AndroidRuntime( 1237): at com.audia.rta.RTA.onCreate(RTA.java:139)
According to some Google results, _ZNSaIcEC1Ev is part of libstdc++. I've checked, and it gets linked in the build process, and g++ is being used for linking.
Oddly enough, reverting to an older apk of the app fixes the problem, but compiling an old revision and installing that doesn't fix the problem. Everything in my build system is checked into version control, and I've done several clean builds. All my builds were working today and then they just stopped working. I didn't upgrade or install anything; it happened while I was in the middle of testing new code. What happened?
Update: Building from a freshly checked out copy doesn't fix the problem.
Update 2: Is there any way I can track down the link to that symbol, maybe with objdump? Maybe this could provide some clues.

I ended up compiling everything with a fresh NDK install, and it worked. It's as if the old one was corrupted somehow, though I have no idea how.
It was also an upgrade from r5b to r6, so maybe it's related to the NDK version.