Error trying to loadLibrary for PDFTron Android

Question

I am getting a strange error when trying to integrate with PDFTron i.e PDFNet Android SDK:

UnsatisfiedLinkError: Couldn't load PDFNetC: findLibrary returned null. Expected armv7a, found cpu_info: abi: armeabi-v7a

I have already checked this link.

Most likely the native library provided by PDFNet Android SDK is not included in my project correctly. Inside the lib folder I the downloaded package, there are native libraries and java library that both need to be included to my project.

Created a folder called jniLibs in main folder and place all .so (with corresponding folder structure) inside the jniLibs folder, i.e.:

This will allow Android Studio to automatically recognize the native library path.

I also specified product flavor to filter which .so to use, such as:

productFlavors {
    armv7a {
        ndk {
            abiFilters "armeabi-v7a"
        }
    }
    arm {
        ndk {
            abiFilters "armeabi"
        }
    }
    x86 {
        ndk {
            abiFilters "x86"
        }
    }
    armv8 {
        ndk {
            abiFilters "arm64-v8a"
        }
    }
    x86_64 {
        ndk {
            abiFilters "x86_64"
        }
    }
    fat {
        ndk {
            abiFilters "armeabi-v7a", "armeabi", "arm64-v8a", "x86", "x86_64"
        }
    }
}

Then I specified the jniLibs directory inside build.gradle file of your project, i.e.:

sourceSets {
    main {
        manifest.srcFile 'AndroidManifest.xml'
        java.srcDirs = ['src']
        resources.srcDirs = ['src']
        res.srcDirs = ['res']
        jniLibs.srcDirs = ['libs']
        svg.srcDir 'src/main/svg'
    }
}

Answer 1

Import PDFTron Library Project in Android Studio. Use that Library Project in your application.For this use compile project(':libraries:PDFViewCtrlTools') in your application's build.gradle.

Now copy libPDFNetC.so file to "jni/libs/armeabi" folder in your application.

in your application.mk write this.

APP_ABI := armeabi-v7a
APP_CPPFLAGS += -std=c++11 -exception
APP_STL := gnustl_shared
APP_PLATFORM=android-19
APP_OPTIM := debug
NDK_TOOLCHAIN_VERSION := 4.8

in your Android.mk file add this

include $(CLEAR_VARS)
LOCAL_MODULE    := libPDFNetC
# this libs path is relative to my jni files, so, src/main/jni/libs/libPrecompiledLib.a
LOCAL_SRC_FILES := libs/armeabi/libPDFNetC.so
include $(PREBUILT_SHARED_LIBRARY)

Edit:

PDFDoc doc = PDFDoc(InputStream var1)

may be by using this method you can open PDF from url.

Code:

PDFViewCtrl mPDFViewCtrl = (PDFViewCtrl) view.findViewById(R.id.pdfViewer);
PDFDoc doc = new PDFDoc(filePath);
mPDFViewCtrl.setDoc(doc);

xml

<pdftron.PDF.PDFViewCtrl
    android:id="@+id/pdfViewer"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scrollbars="vertical|horizontal"
    android:visibility="gone"/>

Answer 2

If you are using standard jniLib structure (i.e. jniLibs in main as shown in your first screenshot), you don't need to specify it in sourceSets anymore. jniLibs.srcDirs = ['libs'] in sourceSets is conflicting with the standard structure (jniLibs).

See https://groups.google.com/forum/?fromgroups#!topicsearchin/pdfnet-sdk/android$20AND$20author$3Asgong@pdftron.com/pdfnet-sdk/0t_3-pN5jG4