ctrysbita / flutter_native_channel Goto Github PK
View Code? Open in Web Editor NEWA fast flutter message channel via FFI.
License: Apache License 2.0
A fast flutter message channel via FFI.
License: Apache License 2.0
like follow code:
SendSynchronousMessageToPlatform(int64_t channel, uint64_t length, uint8_t *data) {
static JniEnv env;
}
By adding a static keyword to cache JniEnv, so when next to invoke this method which can save time.
Don't worry about the different threads when using static keyword, because every time invoke this method in the same thread (Platform thread).
`void JniHelper::StoreGCMethod() {
JniEnv env;
// runtime_class_ = (jclass) env->NewGlobalRef(FindClass(env, "java/lang/Runtime"));
runtime_class_ = (jclass) env->NewGlobalRef(env -> FindClass("java/lang/Runtime"));
auto current_runtime_field = env->GetStaticFieldID(runtime_class_, "currentRuntime", "Ljava/lang/Runtime;");
runtime_ = env->NewGlobalRef(env->GetStaticObjectField(runtime_class_, current_runtime_field));
gc_method_ = env->GetMethodID(runtime_class_, "gc", "()V");
}`
in jni_helper.cc
if use the method FindClass() ,the app will crash. i think it because FindClass() use dexClassloader to find 'java/lang.runtime', and its not right!
一开始点击sync native bin c层RegisterFinalizer会空指针crash,这里能看下为什么吗?
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