我正在一个使用djinni使用跨平台本机C ++的React Native项目中。
我已经looked at this question，但这似乎是一个不同的问题。
项目构建成功，但几乎立即运行失败。adb logcat显示以下异常：
找不到com.djinnius.HelloWorld $ CppProxy的实现com.djinnius.HelloWorld.create（com.rushingvise.reactcpp.ReactBridge）（尝试了Java_com_djinnius_HelloWorld_create和Java_com_djinnius_HelloWorld_create__Lcom_rushingvise_act_reactcpp_Re）
我试图了解上面消息中的tried含义。这是因为apk中缺少相应的本机代码吗？还是另一个原因？
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)
任何帮助表示赞赏。
最佳答案
找到了问题。
实际上，在扩展ReactPackage的Java类中确实缺少System.LoadLibrary（）调用。
现在可以使用此类的初始值设定项
public class HelloWorldPackage implements ReactPackage {
static {
System.loadLibrary("native-lib");
}