jni问题总结:jni error (app bug): accessed stale local reference
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连续两个错误:
jni error (app bug): accessed stale local reference 0xd0100019 (index 6 in a table of size 1)
一、jclass直接赋值导致的问题。
原因:不能直接引用jclass
解决方案:
static jclass myClass;jclass cls = env->FindClass("com/xxx/class");myClass = (jclass)env->NewGlobalRef(cls);
二、在c++某个方法中,直接引用不到jobject时,通过static jobject myObject,给对象set jobject均会发生各种异常。采用调用静态方法。如原来是
env->CallVoidMethod(myObj,postEventFromNativeID, result);非静态方法,需要时jobject(就是当前object),换种思路就是使用静态方法,只需要传入jclass就行。jclass可以通过错误一的结局方案得到,本质上获取jmethodID
env->CallStaticVoidMethod(myClass,postEventFromNativeID, result);
三、jni回调java中某个listener,c++中回调到jni中一个String,回调给java.
jclass myClass= env->FindClass("com/example/hejunlin/Native"); jfieldID mOnDataSourcePreparedListenerFieldId = env->GetFieldID(myClass,"mOnDataSourcePreparedListener","Lcom/example/hejunlin/Native$OnDataSourcePreparedListener;"); jobject mOnDataSourcePreparedListener = env->GetObjectField(myObj, mOnDataSourcePreparedListenerFieldId); if(mOnDataSourcePreparedListener == nullptr) { LOG_INFO("Fail to find jobject"); gJavaVM->DetachCurrentThread(); return; } jmethodID onDataSourcePrepared = env->GetMethodID(myListenerClass, "onDataSourcePrepared", "(Ljava/lang/String;)V"); jstring result = env->NewStringUTF(input_filename); env->CallVoidMethod(mOnDataSourcePreparedListener, onDataSourcePrepared, result);
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