jni C语言调用java的小例子(java返回string)

jclass regionClass = env - >FindClass("com/oppo/util/RfUtils"); //查找java类if (regionClass != 0) {    jmethodID mid;    mid = env - >GetStaticMethodID(regionClass, "getPrjVersion", "()Ljava/lang/String;"); //查找java方法    if (mid != 0) {        jstring size = (jstring) env - >CallStaticObjectMethod(regionClass, mid); //调用ava方法        char * mysize = (char * ) env - >GetStringUTFChars(size, NULL); //转换jstring为char用于显示        LOGI("jni a=%s", mysize);    } else {        LOGI("method not find");    }

java函数原型 类名是com.oppo.util.RfUtils

    public static String getPrjVersion() {if (read_once == false) {initCdtValue();read_once = true;}        return mPrjVersion;    }