android studio 下调用so库时注意事项

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1.app 下 build.gradle中加入如下代码

ndk {//         abiFilters "armeabi"}

如果忘记加上会报如下类似错误

 E/AndroidRuntime: FATAL EXCEPTION: main                              Process: com.ztec.adc.zdcode, PID: 14961

                         java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.ztec.adc.zdcode-2/base.apk"],nativeLibraryDirectories=[/data/app/com.ztec.adc.zdcode-2/lib/arm, /vendor/lib, /system/lib]]] couldn't find "libzdcode.so"                      at java.lang.Runtime.loadLibrary(Runtime.java:366)                      at java.lang.System.loadLibrary(System.java:989)                      at com.ztec.adc.zdcode.Decode.<clinit>(Decode.java:38)

2. 在app目录下新建libs /armeabi文件，在此目录中把so库复制进去

3.app 下 build.gradle中加入如下代码，如果忘记加上

sourceSets {    main {        jniLibs.srcDirs = ['libs']    }}

会报如下类似错误No implementation found for int com.ztec.adc.zdcode.Bardecoder.Initialize() (tried Java_com_ztec_adc_zdcode_Bardecoder_Initialize and Java_com_ztec_adc_zdcode_Bardecoder_Initialize__)

03-25 01:49:30.085 16772-16772/com.ztec.adc.zdcode E/art: No implementation found for int com.ztec.adc.zdcode.Bardecoder.Initialize() (tried Java_com_ztec_adc_zdcode_Bardecoder_Initialize and Java_com_ztec_adc_zdcode_Bardecoder_Initialize__)
03-25 01:49:30.086 16772-16772/com.ztec.adc.zdcode E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.ztec.adc.zdcode, PID: 16772
java.lang.UnsatisfiedLinkError: No implementation found for int com.ztec.adc.zdcode.Bardecoder.Initialize() (tried Java_com_ztec_adc_zdcode_Bardecoder_Initialize and Java_com_ztec_adc_zdcode_Bardecoder_Initialize__)
at com.ztec.adc.zdcode.Bardecoder.Initialize(Native Method)
at com.ztec.adc.zdcode.Decode.onCreate(Decode.java:52)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

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