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我試圖在JNI/NDK和android中實現回調。但是我無法得到方法簽名或其他東西,爲什麼找不到方法?來自NDK的回調在java中找不到方法
我的MainActivity實例調用NDK的功能:
void populate(JNIEnv* aEnv, jobject aObj, jstring str){
....
jclass cls = aEnv->FindClass("com/example/jsonpoco/MainActivity");
jmethodID mid = aEnv->GetMethodID(cls, "add", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;D;D)V");
std::list<MyRefComplexType>::iterator it = ref->myRefs.begin();
for(int i = 0; i < ref->myRefs.size()/100;i++){
std::advance(it, 1);
printf(it->getMyNo().c_str()); //<-Works
jstring myNo = aEnv->NewStringUTF(it->getMyNo().c_str());
jstring myName = aEnv->NewStringUTF(it->getMyName().c_str());
jstring myUrl = aEnv->NewStringUTF(it->getMyUrl().c_str());
aEnv->CallVoidMethod(aObj,mid, myNo, myName, myUrl, it->getMyLocation()->getLatitude(), it->getMyLocation()->getLongitude());
}
我的Java類調用本機代碼實現以下的方法來處理回調:
public void add(String myNo, String myName,String myUrl, double lat, double lon){
storesWrapper.add(storeNo, storeName, storeUrl, lat, lon);
}
我收到以下錯誤:
04-09 16:31:42.431: W/dalvikvm(25852): JNI WARNING: JNI method called with exception pending
04-09 16:31:42.431: W/dalvikvm(25852): in Lcom/example/jsonpoco/MainActivity;.json_parse:(Ljava/lang/String;)V (NewStringUTF)
04-09 16:31:42.431: W/dalvikvm(25852): Pending exception is:
04-09 16:31:42.431: I/dalvikvm(25852): java.lang.NoSuchMethodError: no method with name='add' signature='(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;D;D)V' in class Lcom/example/jsonpoco/MainActivity;