ImportSDKDemo Tutorial Issue : No implementation found for byte[] dji.midware.natives.SDKRelativeJNI.native_getXXXX(java.lang.String)

Question

I have a problem trying to emulate the ImportSDKDemo project.

I am following this tutorial, but there is a missing information, e.g. about MainActivity.class.

When I try to run the emulation I get the following error:

java.lang.UnsatisfiedLinkError: No implementation found for byte[] dji.midware.natives.SDKRelativeJNI.native_getXXXX(java.lang.String) (tried Java_dji_midware_natives_SDKRelativeJNI_native_1getXXXX and Java_dji_midware_natives_SDKRelativeJNI_native_1getXXXX__Ljava_lang_String_2)

Here is the whole log:

09-14 05:04:29.389 3080-3080/? I/m.importsdkdem: Not late-enabling -Xcheck:jni (already on)
09-14 05:04:29.499 3080-3080/? W/m.importsdkdem: Unexpected CPU variant for X86 using defaults: x86
09-14 05:04:30.082 3080-3080/dji.com.importsdkdemo E/sdk: install begin
09-14 05:04:30.086 3080-3080/dji.com.importsdkdemo V/sdk: DexInstall beging
    installSecondarDexs
09-14 05:04:30.086 3080-3080/dji.com.importsdkdemo W/m.importsdkdem: Accessing hidden field Ldalvik/system/BaseDexClassLoader;->pathList:Ldalvik/system/DexPathList; (light greylist, reflection)
    Accessing hidden method Ldalvik/system/DexPathList;->makeInMemoryDexElements([Ljava/nio/ByteBuffer;Ljava/util/List;)[Ldalvik/system/DexPathList$Element; (light greylist, JNI)
09-14 05:04:30.320 3080-3080/dji.com.importsdkdemo W/m.importsdkdem: Accessing hidden field Ldalvik/system/DexPathList;->dexElements:[Ldalvik/system/DexPathList$Element; (light greylist, reflection)
09-14 05:04:30.320 3080-3080/dji.com.importsdkdemo V/sdk: DexInstall end
09-14 05:04:30.376 3080-3098/dji.com.importsdkdemo I/m.importsdkdem: Background concurrent copying GC freed 3588(1814KB) AllocSpace objects, 0(0B) LOS objects, 42% free, 8MB/14MB, paused 12.441ms total 165.671ms
09-14 05:04:30.549 3080-3080/dji.com.importsdkdemo W/m.importsdkdem: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (light greylist, reflection)
    Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (light greylist, reflection)
09-14 05:04:30.594 3080-3142/dji.com.importsdkdemo E/linker: "/data/app/dji.com.importsdkdemo-jCjys7hOmf0GKv6jezsaUw==/lib/x86/libffmpeg.so" has text relocations (https://android.googlesource.com/platform/bionic/+/master/android-changes-for-ndk-developers.md#Text-Relocations-Enforced-for-API-level-23)
09-14 05:04:30.614 3080-3142/dji.com.importsdkdemo W/System.err: java.lang.UnsatisfiedLinkError: dlopen failed: "/data/app/dji.com.importsdkdemo-jCjys7hOmf0GKv6jezsaUw==/lib/x86/libffmpeg.so" has text relocations (https://android.googlesource.com/platform/bionic/+/master/android-changes-for-ndk-developers.md#Text-Relocations-Enforced-for-API-level-23)
        at java.lang.Runtime.loadLibrary0(Runtime.java:1016)
        at java.lang.System.loadLibrary(System.java:1669)
        at dji.midware.natives.SDKRelativeJNI.<clinit>(Unknown Source:2)
        at dji.midware.natives.SDKRelativeJNI.native_getXXXX(Native Method)
        at com.dji.g.a.a.b.a(Unknown Source:24)
        at com.dji.g.a.a.b.a(Unknown Source:5)
        at dji.sdk.sdkmanager.DJISDKManager.<clinit>(Unknown Source:2)
        at dji.sdk.sdkmanager.DJISDKManager.getInstance(Unknown Source:0)
        at dji.com.importsdkdemo.MainActivity$1.run(MainActivity.java:121)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
09-14 05:04:30.615 3080-3142/dji.com.importsdkdemo W/System.err:     at java.lang.Thread.run(Thread.java:764)
09-14 05:04:30.615 3080-3142/dji.com.importsdkdemo D/SDKRelativeJNI: Couldn't load lib
09-14 05:04:30.615 3080-3142/dji.com.importsdkdemo E/m.importsdkdem: No implementation found for byte[] dji.midware.natives.SDKRelativeJNI.native_getXXXX(java.lang.String) (tried Java_dji_midware_natives_SDKRelativeJNI_native_1getXXXX and Java_dji_midware_natives_SDKRelativeJNI_native_1getXXXX__Ljava_lang_String_2)
09-14 05:04:30.625 3080-3142/dji.com.importsdkdemo E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
    Process: dji.com.importsdkdemo, PID: 3080
    java.lang.UnsatisfiedLinkError: No implementation found for byte[] dji.midware.natives.SDKRelativeJNI.native_getXXXX(java.lang.String) (tried Java_dji_midware_natives_SDKRelativeJNI_native_1getXXXX and Java_dji_midware_natives_SDKRelativeJNI_native_1getXXXX__Ljava_lang_String_2)
        at dji.midware.natives.SDKRelativeJNI.native_getXXXX(Native Method)
        at com.dji.g.a.a.b.a(Unknown Source:24)
        at com.dji.g.a.a.b.a(Unknown Source:5)
        at dji.sdk.sdkmanager.DJISDKManager.<clinit>(Unknown Source:2)
        at dji.sdk.sdkmanager.DJISDKManager.getInstance(Unknown Source:0)
        at dji.com.importsdkdemo.MainActivity$1.run(MainActivity.java:121)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)
09-14 05:04:30.655 3080-3080/dji.com.importsdkdemo D/OpenGLRenderer: Skia GL Pipeline
09-14 05:04:30.656 3080-3142/dji.com.importsdkdemo I/Process: Sending signal. PID: 3080 SIG: 9

How can I resolve this problem?

Feel free to ask for the code or the screenshots :)

Answer 1

So it looks like you're using the 4.7.1 SDK and probably targeting a modern Android SDK. The issue you're experiencing is that DJI decided to bundle a version of libffmpeg.so that is incompatible with modern SDK versions on the x86 platform (the x86 platform is what your emulator is running on).

You have 2, possibly three options:

1. In Android Studio, when you create a new Virtual Device, when you get to Select a system image go to the Other images tab. From there select any of the 'arm' images and use that. The emulator will be extremely slow with this option, and might not run at all if your computer is old or slow.
2. Connect a real Android device to your computer with debugging mode enabled and run the demo on that.
3. In your build.gradle file, set compileSdkVersion and targetSdkVersion to 23 which is the latest version in which DJI's provided libffmpeg.so file will load. This is the worst option though, as Google doesn't allow anybody to publish apps with SDK versions this low anymore. The version must be 26 or above now: https://support.google.com/googleplay/android-developer/answer/113469#targetsdk