Android Studio 中的 JNI 文件夹 [英] JNI folder in Android Studio

问题描述

我正在尝试在 Android Studio 中制作 helloy-jni 应用程序，但出现异常

06-27 13:17:19.099 12714-12714/com.example.testjni2 E/AndroidRuntime:致命异常:mainjava.lang.ExceptionInInitializerError在 java.lang.Class.newInstanceImpl(Native Method)在 java.lang.Class.newInstance(Class.java:1319)在 android.app.Instrumentation.newActivity(Instrumentation.java:1071)在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2166)在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2299)在 android.app.ActivityThread.access$700(ActivityThread.java:154)在 android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284)在 android.os.Handler.dispatchMessage(Handler.java:99)在 android.os.Looper.loop(Looper.java:137)在 android.app.ActivityThread.main(ActivityThread.java:5306)在 java.lang.reflect.Method.invokeNative(Native Method)在 java.lang.reflect.Method.invoke(Method.java:511)在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)在 dalvik.system.NativeStart.main(本机方法)引起:java.lang.UnsatisfiedLinkError:无法从加载器dalvik.system.PathClassLoader加载hello-jni[dexPath=/data/app/com.example.testjni2-1.apk,libraryPath=/data/app-lib/com.example.testjni2-1]:findLibrary 返回空值在 java.lang.Runtime.loadLibrary(Runtime.java:365)在 java.lang.System.loadLibrary(System.java:535)在 com.example.testjni2.MainActivity.<clinit>(MainActivity.java:9)……还有 15 个

我的结构项目是这样的

我添加了我的 build.gradle 行:

 编译文件('libs/armeabi/libhello-jni.so')

但这无济于事.我阅读了 Gradle 和 Android Gradle 插件，但我没有找到有关使用 jni 文件夹的信息

我在想什么文件依赖，但它不起作用

我的 hello-jni.c 文件包括

jstring Java_com_example_testjni2_MainActivity_stringFromJNI (JNIEnv *env, jobject thiz){return (*env)->NewStringUTF(env, "Hello from JNI !");}

我的 MainActivity 文件包含

public class MainActivity extends Activity {静止的 {System.loadLibrary("hello-jni");}公共本机字符串 stringFromJNI();@覆盖protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);字符串文本 = stringFromJNI();Log.i("MainActivity", text);}@覆盖公共布尔 onCreateOptionsMenu(菜单菜单){//给菜单充气；如果它存在，这会将项目添加到操作栏.getMenuInflater().inflate(R.menu.main, menu);返回真；}}

我的 Android.mk 文件包含

LOCAL_PATH := $(call my-dir)包括 $(CLEAR_VARS)LOCAL_MODULE := hello-jniLOCAL_SRC_FILES := hello-jni.c包括 $(BUILD_SHARED_LIBRARY)

请告诉我，我哪里会出错.

Android Studio 0.1.7操作系统 - Windows 7 x64

解决方案

gradle 构建系统目前不支持捆绑本地库.检查 https://groups.google.com/d/msg/adt-dev/nQobKd2Gl_8/Z5yWAvCh4h4J 对于一些需要添加到 build.gradle 的自定义任务.

请注意，这是 gradle 支持构建原生项目之前的临时解决方法.

I am trying make helloy-jni app in Android Studio and I have exception

06-27 13:17:19.099  12714-12714/com.example.testjni2           E/AndroidRuntime: FATAL EXCEPTION: main
    java.lang.ExceptionInInitializerError
    at java.lang.Class.newInstanceImpl(Native Method)
    at java.lang.Class.newInstance(Class.java:1319)
    at android.app.Instrumentation.newActivity(Instrumentation.java:1071)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2166)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2299)
    at android.app.ActivityThread.access$700(ActivityThread.java:154)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:5306)
    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:1102)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
    at dalvik.system.NativeStart.main(Native Method)
    Caused by: java.lang.UnsatisfiedLinkError: Couldn't load hello-jni from loader dalvik.system.PathClassLoader[dexPath=/data/app/com.example.testjni2-1.apk,libraryPath=/data/app-lib/com.example.testjni2-1]: findLibrary returned null
    at java.lang.Runtime.loadLibrary(Runtime.java:365)
    at java.lang.System.loadLibrary(System.java:535)
    at com.example.testjni2.MainActivity.<clinit>(MainActivity.java:9)
    ... 15 more

My structure project looks like this

I added my build.gradle line:

   compile files('libs/armeabi/libhello-jni.so')

But this don't helped. I read Gradle and Android Gradle plugin, but I don't find information about working with jni folder

I am thinking what it file dependencies, but it isn't working

My hello-jni.c file includ

jstring  Java_com_example_testjni2_MainActivity_stringFromJNI (JNIEnv *env, jobject thiz){
    return (*env)->NewStringUTF(env, "Hello from JNI !");
  }

My MainActivity file include

public class MainActivity extends Activity {
    static {
        System.loadLibrary("hello-jni");
    }
    public native String  stringFromJNI();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String text = stringFromJNI();
        Log.i("MainActivity", text);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

My Android.mk file containts

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE    := hello-jni
LOCAL_SRC_FILES := hello-jni.c

include $(BUILD_SHARED_LIBRARY)

Tell me, please, where I could make a mistake.

Android Studio 0.1.7 OS - Windows 7 x64

解决方案

The gradle build system does not support bundling native libraries at the moment. Check https://groups.google.com/d/msg/adt-dev/nQobKd2Gl_8/Z5yWAvCh4h4J for some custom tasks you'd need to add to your build.gradle.

Note that this is a temporary workaround until gradle supports building native projects.

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