Develop Reference

FFmpegMediaPlayer: findLibrary returned null

I use https://github.com/wseemann/FFmpegMediaPlayer in my application, but some Android device throw exception:
java.lang.ExceptionInInitializerError
at ru.mypackage.PlayService.initPlayer(PlayService.java:74)
at ru.mypackage.PlayService.onCreate(PlayService.java:68)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:1949)
at android.app.ActivityThread.access$2500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:989)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.UnsatisfiedLinkError: Couldn't load avutil: findLibrary returned null
at java.lang.Runtime.loadLibrary(Runtime.java:429)
at java.lang.System.loadLibrary(System.java:554)
at wseemann.media.FFmpegMediaPlayer.<clinit>(FFmpegMediaPlayer.java:620)
... 13 more
My project:
Can somebody explain me what's wrong there?
On my device and some other device the app working nice, but on some device (for example: Galaxy Ace (GT-S5830i) Android 2.3.3 - 2.3.7) it throw the exception.
p.s. about "lib" prefix I understood ( https://developer.android.com/reference/java/lang/System.html#mapLibraryName(java.lang.String) )

You have to place the armeabi file under jnilibs folder (you will have to create it) in app/src/main/.
Hope it helps.

Android Studio seems to build old version of project

I am wondering if this is some bug in Android Studio or I am simply lack od knowladge but straight to the point.
I am writing simple client-server via bluetooth app on android. At some point I encoured following problem:
07-11 18:59:20.553 10364-10364/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not find a method parujUrzadzenia(View) in the activity class com.example.pc.klient_serwerbluetooth.Klient for onClick handler on view class android.widget.Button with id 'button6'
at android.view.View$1.onClick(View.java:3775)
at android.view.View.performClick(View.java:4421)
at android.view.View$PerformClick.run(View.java:18190)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:175)
at android.app.ActivityThread.main(ActivityThread.java:5279)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NoSuchMethodException: parujUrzadzenia [class android.view.View]
at java.lang.Class.getConstructorOrMethod(Class.java:460)
at java.lang.Class.getMethod(Class.java:915)
at android.view.View$1.onClick(View.java:3768)
at android.view.View.performClick(View.java:4421)
at android.view.View$PerformClick.run(View.java:18190)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:175)
at android.app.ActivityThread.main(ActivityThread.java:5279)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
07-11 19:34:00.498 449-522/? E/ActivityManager﹕ The package com.example.pc.klient_serwerbluetooth is not found. Failure starting process com.example.pc.klient_serwerbluetooth
For what I understand Android Studio can't find method parujUrzadzenia(View) that is marked in button6's properties as onClick method...the funny thing is i deleted this button in my way of solving this problem.
I can't post picture of my project due to low reputation but like I said. I've deleted the reference to method from .xml and method from .java file and got an error saying that there is no required onClick method. So I deleted this whole button and still got this error.
Any advices will be greatly appreciated.

Vuforia jPCT integration and build jni

I getting following error while running imagetarge vuforia jPCT project
W/dalvikvm(3469): threadid=1: thread exiting with uncaught exception (group=0xa4c4e648)
E/AndroidRuntime(3469): FATAL EXCEPTION: main
E/AndroidRuntime(3469): java.lang.UnsatisfiedLinkError: Native method not found: com.qualcomm.ar.pl.CameraPreview.newFrameAvailable:(IIII[B)V
E/AndroidRuntime(3469): at com.qualcomm.ar.pl.CameraPreview.newFrameAvailable(Native Method)
E/AndroidRuntime(3469): at com.qualcomm.ar.pl.CameraPreview.onPreviewFrame(CameraPreview.java:805)
E/AndroidRuntime(3469): at android.hardware.Camera$EventHandler.handleMessage(Camera.java:791)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(3469): at android.app.ActivityThread.main(ActivityThread.java:5103)
E/AndroidRuntime(3469): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(3469): at java.lang.reflect.Method.invoke(Method.java:525)
E/AndroidRuntime(3469): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
E/AndroidRuntime(3469): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/AndroidRuntime(3469): at dalvik.system.NativeStart.main(Native Method)
I read all vuforia blog and google search but not able to solve problem
Please help me...

Used latest vaforia.jar to solve problem
Download latest sdk from https://developer.vuforia.com/resources/sdk/android

NDK App Crashing After Uploading on Play Store

I uploaded an app to the playstore. The app contains native C code. I compiled it successfully using NDK, created the signed apk. I also installed the signed apk and checked. Everything worked fine.
After uploading it I downloaded it from playstore and it crashed.
Following is the stack trace:
java.lang.ExceptionInInitializerError
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1319)
at android.app.Instrumentation.newActivity(Instrumentation.java:1057)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2015)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
at android.app.ActivityThread.access$600(ActivityThread.java:140)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4898)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.UnsatisfiedLinkError: Couldn't load hello-jni: findLibrary returned null
at java.lang.Runtime.loadLibrary(Runtime.java:365)
at java.lang.System.loadLibrary(System.java:535)
at com.somepackage.anotherpackage.SomeActivity.<clinit>(SomeActivity.java:56)
... 15 more
The error states that System.loadLibrary returned null. But the same code when run using eclipse works fine.
Thanks for any help

Seems like your apk is missing libhello-jni.so. Maybe it was not packaged during apk build.
If you open your apk with a zip software, you should have a folder libs containing libhello-jni.so : if you don't have it, then you forgot something at build time.

How to upload file on google drive using my android application

I start with google drive sdk. I follows steps which describe in that post.
But I face problem in Step 3: Create and Configure an Android Project
I cant find options in my eclipse so I add plugins for google. After installation of plugins, Eclipse give errors and we now update my SDK also. So for that I update my SDK but now All projects giving me error in eclipse. I cant run any projects. So I use my old SDK back.
Now I stuck with this How to create Project for Google Drive and how to integrate it.
I need to upload file from my android application to Google Drive.
Please help me to find this.
EDIT
Now I successfully create project with error free. But when I run project it give me following errors.
12-12 11:05:08.788: E/AndroidRuntime(377): java.lang.NoClassDefFoundError: com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential
12-12 11:05:08.788: E/AndroidRuntime(377): at com.rarenoice.screen.MainActivity.onCreate(MainActivity.java:42)
12-12 11:05:08.788: E/AndroidRuntime(377): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-12 11:05:08.788: E/AndroidRuntime(377): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
12-12 11:05:08.788: E/AndroidRuntime(377): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
12-12 11:05:08.788: E/AndroidRuntime(377): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
12-12 11:05:08.788: E/AndroidRuntime(377): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
12-12 11:05:08.788: E/AndroidRuntime(377): at android.os.Handler.dispatchMessage(Handler.java:99)
12-12 11:05:08.788: E/AndroidRuntime(377): at android.os.Looper.loop(Looper.java:123)
12-12 11:05:08.788: E/AndroidRuntime(377): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-12 11:05:08.788: E/AndroidRuntime(377): at java.lang.reflect.Method.invokeNative(Native Method)
12-12 11:05:08.788: E/AndroidRuntime(377): at java.lang.reflect.Method.invoke(Method.java:521)
12-12 11:05:08.788: E/AndroidRuntime(377): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-12 11:05:08.788: E/AndroidRuntime(377): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-12 11:05:08.788: E/AndroidRuntime(377): at dalvik.system.NativeStart.main(Native Method)
At Following line :-
private GoogleAccountCredential credential;
credential = GoogleAccountCredential.usingOAuth2(MainActivity.this,
DriveScopes.DRIVE);

You need to add the Google Play Services jars to your project, as explained in Step 3 of the quickstart guide you are following.
You can also watch this video where I go through all the steps to build the same quickstart application for Android: http://www.youtube.com/watch?v=Ied1CjJ0iP0