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jnihelp.h頭文件根據需求自行添加，也可以直接刪除
| #define LOG_TAG "JNIHelp" #include "JNIHelp.h" #include "android/log.h" #include <string.h> #include <assert.h> #include <stdio.h> #include <stdlib.h> static void getExceptionSummary(JNIEnv* env, jthrowable exception, char* buf, size_t bufLen) { int success = 0; /* get the name of the exception's class */ jclass exceptionClazz = env->GetObjectClass(exception); // can't fail jclass classClazz = env->GetObjectClass(exceptionClazz); // java.lang.Class, can't fail jmethodID classGetNameMethod = env->GetMethodID(classClazz, "getName", "()Ljava/lang/String;"); jstring classNameStr = static_cast<jstring>(env->CallObjectMethod(exceptionClazz, classGetNameMethod)); if (classNameStr != NULL) { /* get printable string */ const char* classNameChars = env->GetStringUTFChars( classNameStr, NULL); if (classNameChars != NULL) { /* if the exception has a message string, get that */ jmethodID throwableGetMessageMethod = env->GetMethodID( exceptionClazz, "getMessage", "()Ljava/lang/String;"); jstring messageStr = static_cast<jstring>(env->CallObjectMethod(exception, throwableGetMessageMethod)); if (messageStr != NULL) { const char* messageChars = env->GetStringUTFChars( messageStr, NULL); if (messageChars != NULL) { snprintf(buf, bufLen, "%s: %s", classNameChars, messageChars); env->ReleaseStringUTFChars( messageStr, messageChars); } else { env->ExceptionClear(); // clear OOM snprintf(buf, bufLen, "%s: <error getting message>", classNameChars); } env->DeleteLocalRef( messageStr); } else { strncpy(buf, classNameChars, bufLen); buf[bufLen - 1] = '\0'; } env->ReleaseStringUTFChars( classNameStr, classNameChars); success = 1; } env->DeleteLocalRef( classNameStr); } env->DeleteLocalRef( classClazz); env->DeleteLocalRef( exceptionClazz); if (! success) { env->ExceptionClear(); snprintf(buf, bufLen, "%s", "<error getting class name>"); } } /* Throw an exception with the specified class and an optional message.*/ int jniThrowException(JNIEnv* env) { jclass exceptionClass; int result = 0; if (env->ExceptionCheck()) { /* TODO: consider creating the new exception with this as "cause" */ char buf[256]; jthrowable exception = env->ExceptionOccurred(); env->ExceptionClear(); if (exception != NULL) { getExceptionSummary(env,exception, buf, sizeof(buf)); //LOGW("Discarding pending exception (%s) to throw %s\n", buf, className); __android_log_print(ANDROID_LOG_INFO, "", "Discarding pending exception (%s) to throw\n",buf); env->DeleteLocalRef(exception); result = -1; } } return result; } |
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