1 static void android_mtp_MtpServer_add_storage(JNIEnv *env, jobject thiz, jobject jstorage)
 2 {
 3     Mutex::Autolock autoLock(sMutex);
 4 
 5     // 獲取MtpServer物件
 6     MtpServer* server = getMtpServer(env, thiz);
 7     if (server) {
 8         // field_MtpStorage_storageId 和 “MtpStorage.java中的mStorageId” 對應
 

 9         jint storageID = env->GetIntField(jstorage, field_MtpStorage_storageId);
10         // field_MtpStorage_path 和 “MtpStorage.java中的mPath” 對應
11         jstring path = (jstring)env->GetObjectField(jstorage, field_MtpStorage_path);
12         // field_MtpStorage_description 和 “MtpStorage.java中的mDescription” 對應
 

13         jstring description = (jstring)env->GetObjectField(jstorage, field_MtpStorage_description);
14         // field_MtpStorage_reserveSpace 和 “MtpStorage.java中的mReserveSpace” 對應
15         jlong reserveSpace = env->GetLongField(jstorage, field_MtpStorage_reserveSpace);
16         // field_MtpStorage_removable 和 “MtpStorage.java中的mRemovable” 對應
 

17         jboolean removable = env->GetBooleanField(jstorage, field_MtpStorage_removable);
18         // field_MtpStorage_maxFileSize 和 “MtpStorage.java中的mMaxFileSize” 對應
19         jlong maxFileSize = env->GetLongField(jstorage, field_MtpStorage_maxFileSize);
20 
21         // 將“jstring型別的path”轉換為“C語言中的char *型別”
22         const char *pathStr = env->GetStringUTFChars(path, NULL);
23         if (pathStr != NULL) {
24             // 獲取“儲存裝置”的描述字串
25             const char *descriptionStr = env->GetStringUTFChars(description, NULL);
26             if (descriptionStr != NULL) {
27                 // 建立(MtpStorage.cpp)MtpStorage物件
28                 MtpStorage* storage = new MtpStorage(storageID, pathStr, descriptionStr,
29                         reserveSpace, removable, maxFileSize);
30                 // 將該MtpStorage物件，新增到MtpServer中
31                 server->addStorage(storage);
32                 env->ReleaseStringUTFChars(path, pathStr);
33                 env->ReleaseStringUTFChars(description, descriptionStr);
34             } else {
35                 env->ReleaseStringUTFChars(path, pathStr);
36             }
37         }
38     } else {
39         ALOGE("server is null in add_storage");
40     }
41 }