Android 控制台显示：W/art：尝试删除非 JNI 本地引用

Question

我刚刚设置了我的第一个 Cordova 项目并安装了 OneSignal 推送通知。这一切都如我所料，但是 Android 开发人员工具在控制台中显示了这一点：

W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
I/art: WaitForGcToComplete blocked for 6.202ms for cause Background
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread
W/art: Attempt to remove non-JNI local reference, dumping thread

当应用处于运行时，此消息不断输出。

这是什么意思，我该如何解决任何问题？

Answer 1

条目与 OneSignal 无关。从以下线程来看，这似乎是 WebView 的错误，并且在使用 host GPU 时可能更常发生在枚举器上 off。请参阅以下与此相关的主题。

Android webview using GSAP: Attempt to remove non-JNI local reference, dumping thread
https://forum.ionicframework.com/t/ionic-app-crashing-only-on-android-emulator/33375/2

Answer 2

看来问题与this Chromium bug有关。引用错误报告：

On recent versions of ART with CheckJNI turned on, this causes a spammy warning to be printed to logcat stating "Attempt to remove non-JNI local reference, dumping thread" with a thread dump, as apparently parameters are not supposed to be deleted, only objects returned as local references from native->java JNI calls. This is not actually a problem since the runtime just does nothing in this case (other than printing the warning), but it's spammy for webview-using applications that may want to run development builds with checkjni enabled.

这与主机 GPU 模拟问题不同，主机 GPU 模拟问题会使应用程序崩溃，而不是让它运行带有垃圾邮件警告。

我看了很多，但找不到在 ART 上禁用 CheckJNI 的方法（即使 Dalvik 可以）。我目前的解决方法是过滤 logcat。为此，select Android Studio 的 logcat window 中的警告文本，然后右键单击它并选择 Fold lines like this。

Answer 3

如果您是一名开发人员，在您自己的应用程序中收到此消息，请确保您没有意外删除作为参数提供给您的 JNI 方法的本地引用。

即不要这样做：

JNIEXPORT void JNICALL Java_my_app_MyClass_myMethod
    (JNIEnv* env, jobject self, jobject someParam) {
    env->DeleteLocalRef(someParam);
}

Answer 4

就我而言，这是因为我的 WebView (animation: donut-spin 1.2s linear infinite;) 中有一个 CSS 动画导致出现此错误消息。

我尝试了 https://issuetracker.google.com/issues/37065041#comment10 中描述的方法，但它没有用......所以我只是评论我的 CSS 动画，而运行在模拟器中。

Android 控制台显示：W/art：尝试删除非 JNI 本地引用

Android console displays: W/art: Attempt to remove non-JNI local reference

android

logcat

cordova

android-studio