ZBar - QR Code Scanner, crashing in Android Studio

问题:

I have downloaded from git latest zBar QR Code Scanner (SDK 0.2). I am trying to implement it in my application. I work on Android Studio.

What have I done:

1. I have copied zBar.jar to libs folder of my Project.
2. I have created *.jar files from "amerabi", "amerabi-v7a", "x86" by zip'ing them and changing their format to *.jar.
3. I have copied amerabi.jar, amerabi-v7a.jar and x86.jar to libs folder of my Project.

4. There is no need to change anything in gradle because it is already configured to import every jar file from libs projects. See below:

   dependencies {
       compile 'com.android.support:support-v4:18.0.+'
       compile 'com.crashlytics.android:crashlytics:1.+'
   
       compile fileTree(dir: 'libs', include: '*.jar')
   
       compile project(':FacebookSDK')
       compile project(':actionbarsherlock')
       compile project(':Aviary-SDK')
   }
   

5. Every class form zBar lib can be seen so I have configured everything. I run my ScannerActivity and in onCreate I get error in this line:

   scanner = new ImageScanner();  // this line shows an error
   scanner.setConfig(0, Config.X_DENSITY, 3);
   scanner.setConfig(0, Config.Y_DENSITY, 3);
   

So implementation is 1:1 the same as in example.

My error log:

java.lang.UnsatisfiedLinkError: Couldn't load zbarjni from loader dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/pl.toptof.android.debug-2.apk"],nativeLibraryDirectories=[/data/app-lib/pl.toptof.android.debug-2, /vendor/lib, /system/lib]]]: findLibrary returned null

Please help me with that problem. I don't know why my Android Studio can see lib but can't use it in the same way it's used in example.

回答1:

I think, you made mistake in your jars structures. If you want to make jar package from *.so libs you should use that kind of structure:

/lib/armeabi/*.so

It is directory structure example for your library:

lib/
---/armeabi
------/libiconv.so
------/libzbarjni.so

and of course you should rename final package from lib.zip to armeabi.jar. In your case you should repeat this process for armeabi-v7a and x86.

回答2:

The solution is too complicated. What I did to get it working, was to use the jar files already compiled in the example solution from this example. Copy them to your lib folder and make sure to also add them in the gradle file. However, your line compile fileTree(dir: 'libs', include: '*.jar') should do the trick.

回答3:

Put the directories armeabi, armeabi-v7a, and x86 in a sub-directory called native-libs under your root project folder. Then add these settings to your build.gradle file:

android {
    // other settings
    sourceSets {
            main {
                jni.srcDirs=[] //to suppress makefiles autogeneration
                jniLibs.srcDirs=['native-libs'] //native *.so in armeabi x86 and mips to include
            }
        }
}

The resulting .apk should have the native libs included now.

回答4:

You better check if you have the newest possible version of ZBar in dependencies in your app.gradle file. Getting the latest version worked for me and solved all the problems like failing to find libzbarjni.so and libiconv.so