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使用Android Studio编写NDK问题

发布时间:2016-12-3 17:43:35 编辑:www.fx114.net 分享查询网我要评论
本篇文章主要介绍了"使用Android Studio编写NDK问题",主要涉及到使用Android Studio编写NDK问题方面的内容,对于使用Android Studio编写NDK问题感兴趣的同学可以参考一下。

1. 不能正常加载编译出的so文件,异常如下 02-18 21:18:50.241  17027-17027/com.android.encrypt E/AndroidRuntime﹕ FATAL EXCEPTION: main     java.lang.ExceptionInInitializerError             at com.android.encrypt.MainActivity.onCreate(MainActivity.java:31)             at android.app.Activity.performCreate(Activity.java:5206)             at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)             at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2171)             at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)             at android.app.ActivityThread.access$600(ActivityThread.java:142)             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1235)             at android.os.Handler.dispatchMessage(Handler.java:99)             at android.os.Looper.loop(Looper.java:137)             at android.app.ActivityThread.main(ActivityThread.java:5071)             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:808)             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:575)             at dalvik.system.NativeStart.main(Native Method)      Caused by: java.lang.UnsatisfiedLinkError: Couldn't load Encrypt from loader dalvik.system.PathClassLoader[dexPath=/data/app/com.android.encrypt-2.apk,libraryPath=/data/app-lib/com.android.encrypt-2]: findLibrary returned null             at java.lang.Runtime.loadLibrary(Runtime.java:365)             at java.lang.System.loadLibrary(System.java:535)             at com.android.encrypt.CommonEncrypt.<clinit>(CommonEncrypt.java:20)             at com.android.encrypt.MainActivity.onCreate(MainActivity.java:31)             at android.app.Activity.performCreate(Activity.java:5206)             at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)             at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2171)             at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)             at android.app.ActivityThread.access$600(ActivityThread.java:142)             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1235)             at android.os.Handler.dispatchMessage(Handler.java:99)             at android.os.Looper.loop(Looper.java:137)             at android.app.ActivityThread.main(ActivityThread.java:5071)             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:808)             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:575)             at dalvik.system.NativeStart.main(Native Method) 分析之后,是因为编译出的so没有打包到apk中,因此是Android Studio的打包过程可能出现了问题 查阅相关资料之后,发现打包相应的jar或者so,在build.gradle文件中配置,相应参考文档:http://tools.android.com/tech-docs/new-build-system/user-guide 要把so库打包到apk中,需要在build.gradle加入下面内容: task copyNativeLibs(type: Copy) {     from fileTree(dir: 'libs', include: 'armeabi/*.so') into 'build/lib' } tasks.withType(Compile) {     compileTask -> compileTask.dependsOn copyNativeLibs } clean.dependsOn 'cleanCopyNativeLibs' tasks.withType(com.android.build.gradle.tasks.PackageApplication) { pkgTask ->     pkgTask.jniFolders = [new File(buildDir, 'lib')] } 2. java层找不到native方法,异常如下: 02-18 21:27:21.802  18785-18785/com.android.encrypt E/AndroidRuntime﹕ FATAL EXCEPTION: main     java.lang.UnsatisfiedLinkError: Native method not found: com.android.encrypt.CommonEncrypt.encrypt:([B)[B             at com.android.encrypt.CommonEncrypt.encrypt(Native Method)             at com.android.encrypt.CommonEncrypt.Encrypt(CommonEncrypt.java:51)             at com.android.encrypt.MainActivity.onCreate(MainActivity.java:31)             at android.app.Activity.performCreate(Activity.java:5206)             at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)             at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2171)             at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)             at android.app.ActivityThread.access$600(ActivityThread.java:142)             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1235)             at android.os.Handler.dispatchMessage(Handler.java:99)             at android.os.Looper.loop(Looper.java:137)             at android.app.ActivityThread.main(ActivityThread.java:5071)             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:808)             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:575)             at dalvik.system.NativeStart.main(Native Method) 02-18 21:27:21.862  18785-18785/com.android.encrypt I/Process﹕ Sending signal. PID: 18785 SIG: 9 解决方法:如果是C++文件(.cpp或者.cc),要使用extern "C" {   } 把本地方法括进去。 3.待续

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