接下来,我们需要创建JNI方法,以便在C++中调用Java接口方法。以下是一个示例: #include<jni.h>extern"C"{JNIEXPORTvoidJNICALLJava_com_example_MyClass_callbackFromC(JNIEnv*env,jobject javaObject,jstring message){// Find the Java classjclass javaClass=env->GetObjectClass(javaObject);// Find the Java ...
}//通过全局变量g_obj 获取到要回调的类jclass javaClass = (*env)->GetObjectClass(env, g_obj);if(javaClass ==0) {//LOGI("Unable to find class");(*g_VM)->DetachCurrentThread(g_VM);return; }//获取要回调的方法IDjmethodID javaCallbackId = (*env)->GetMethodID(env, javaClass,"onProgr...
CALLBACKEXAMPLE ||--|| CALLBACKJNI : "calls" 序列图 以下是 JNI 函数调用 Java 方法的序列图: sequenceDiagram participant C as CallbackJNI participant J as CallbackExample C->>J: new CallbackExample() C->>J: callbackMethod("Hello from JNI!") J-->>C: println("Callback received: ...
JNIEXPORTvoidJNICALL Java_com_example_provider_CallbackJava_callHelloFromJava (JNIEnv*env, jobject obj) {//1、 找java中的class文件//第二个参数是类名的(包名)jclass jclazz = (*env)->FindClass(env,"com/example/provider/CallbackJava");if(jclazz==0) { LOGD("class not find");return; }...
Java JNI接口声明如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 public native String stringFromJNI(String src); public native String CallbackFuncTest(); public native int CallbackClassTest(); public native int CallbackStaticVarTest(); public native int CallbackVarTest(TestNative obj); ...
2. C/C++代码的步骤 在 Java 类中声明一个native方法 public native void sayHello(); 使用 javah ...
JNIEXPORTjstringJNICALLJava_Prompt_getLine(JNIEnv*env,jobjectobj,jstringprompt){printf("%s",prompt);...} 3.2.1. 转换到本地字符串 使用对应的JNI函数把jstring转成C/C++字串。JNI支持Unicode/UTF-8字符编码互转。Unicode以16-bits值编码;UTF-8是一种以字节为单位变长格式的字符编码,并与7-bits ASCII码...
The Java Native Interface (JNI) is a standard to integrate in a portable way C++ and Java code. It works in both directions: you can call a C++ library from Java or you can call Java components from C++. In this tutorial, I'll explain the second approach. Background JNI is frequently...
private void callbackException() throws NullPointerException { throw new NullPointerException("MainActivity.callbackException"); } 6、输出 09-26 10:58:50.012 23934-23934/com.jinwei.jnitesthello W/System.err: java.lang.NullPointerException: MainActivity.callbackException ...
The Java Native Interface (JNI) is how you call C/C++ ("native") code from Java/Kotlin ("managed") code, or the other way around. There's a fullJava Native Interface Specification, but this document should give you enough detail to write useful code without being overwhelmed. ...