Android JNI ArrayList how to use

来源：互联网发布：nginx 安装目录编辑：程序博客网时间：2024/06/05 09:42

jint result_size;
jfieldID fid;
jobject jobj;
jclass cls;
jmethodID mArrayList_size;
jmethodID mArrayList_get;
jmethodID mString;

cls = (*env)->GetObjectClass (env, urllist);
mArrayList_size = (*env)->GetMethodID (env, cls, "size", "()I");
mArrayList_get = (*env)->GetMethodID (env, cls, "get", "(I)Ljava/lang/Object;");
result_size    = (*env)->CallIntMethod(env,urllist,mArrayList_size);

int i ;
str = (char**)malloc (sizeof(char*)*result_size);
for (i = 0 ; i < result_size ; i++) {
  jstring jstr;
  jstr = (*env)->CallObjectMethod(env,urllist,mArrayList_get,i);
  if (NULL != jstr) {
     *(str+i) = (*env)->GetStringUTFChars (env, jstr, NULL);
  }
}

// use str

//..........

//release jstr

for (i = 0 ; i < result_size ; i++){
jstring jstr;
jstr = (*env)->CallObjectMethod(env,urllist,mArrayList_get,i);
(*env)->ReleaseStringUTFChars (env, jstr, *(str+i));
}
free(str);

对于如何释放jsting，觉得这样效率不高，还没有找到好的办法。

经过测试，result_size 过大（max 512），VM会溢出。