我正在开发一个使用 djinni 的 React Native 项目使用跨平台原生 C++。
我已经looked at this question , 但它似乎是一个不同的问题。
项目构建成功,但在运行时几乎立即失败。
adb logcat
显示以下异常:
No implementation found for com.djinnius.HelloWorld$CppProxy com.djinnius.HelloWorld.create(com.rushingvise.reactcpp.ReactBridge) (tried Java_com_djinnius_HelloWorld_create and Java_com_djinnius_HelloWorld_create__Lcom_rushingvise_reactcpp_ReactBridge_2)
我试图理解上面消息中 tried
的含义。这是因为 apk 中缺少相应的 native 代码吗?还是其他原因?
完整的 logcat 如下:
04-19 19:44:51.042 2354-2700/com.djinnius E/art: No implementation found for com.djinnius.HelloWorld$CppProxy com.djinnius.HelloWorld.create(com.rushingvise.reactcpp.ReactBridge) (tried Java_com_djinnius_HelloWorld_create and Java_com_djinnius_HelloWorld_create__Lcom_rushingvise_reactcpp_ReactBridge_2)
04-19 19:44:51.045 2354-2354/com.djinnius W/unknown:React: Caught exception after cancelling react context init
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object com.facebook.react.ReactInstanceManager$Result.get()' on a null object reference
at com.facebook.react.ReactInstanceManager$ReactContextInitAsyncTask.onCancelled(ReactInstanceManager.java:247)
at com.facebook.react.ReactInstanceManager$ReactContextInitAsyncTask.onCancelled(ReactInstanceManager.java:197)
at android.os.AsyncTask.finish(AsyncTask.java:665)
at android.os.AsyncTask.-wrap1(AsyncTask.java)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:684)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6339)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1084)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:945)
04-19 19:44:51.053 2354-2700/com.djinnius E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #3
Process: com.djinnius, PID: 2354
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:325)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.UnsatisfiedLinkError: No implementation found for com.djinnius.HelloWorld$CppProxy com.djinnius.HelloWorld.create(com.rushingvise.reactcpp.ReactBridge) (tried Java_com_djinnius_HelloWorld_create and Java_com_djinnius_HelloWorld_create__Lcom_rushingvise_reactcpp_ReactBridge_2)
at com.djinnius.HelloWorld.create(Native Method)
at com.djinnius.HelloWorld.<init>(HelloWorld.java:27)
at com.djinnius.HelloWorldPackage.createNativeModules(HelloWorldPackage.java:18)
at com.facebook.react.NativeModuleRegistryBuilder.processPackage(NativeModuleRegistryBuilder.java:88)
at com.facebook.react.ReactInstanceManager.processPackage(ReactInstanceManager.java:950)
at com.facebook.react.ReactInstanceManager.createReactContext(ReactInstanceManager.java:891)
at com.facebook.react.ReactInstanceManager.access$600(ReactInstanceManager.java:104)
at com.facebook.react.ReactInstanceManager$ReactContextInitAsyncTask.doInBackground(ReactInstanceManager.java:218)
at com.facebook.react.ReactInstanceManager$ReactContextInitAsyncTask.doInBackground(ReactInstanceManager.java:197)
at android.os.AsyncTask$2.call(AsyncTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
感谢任何帮助。
最佳答案
发现问题。 它确实是在扩展 ReactPackage 的 Java 类中缺少 System.LoadLibrary() 调用。 现在可以使用这个类初始化器
public class HelloWorldPackage implements ReactPackage {
static {
System.loadLibrary("native-lib");
}
关于android - 没有找到 com.djinnius.HelloWorld$CppProxy 的实现,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49927400/