FlatBuffers小结

1.集成FlatBuffer的java源码https://github.com/google/flatbuffers /trunk/java目录

2.https://github.com/google/flatbuffers/releases下载flatc.exe

3.编写fbs文件

4.flatc.exe --java xx.fbs生成java文件

5.如下编解码

 String jsonText =new String(Utils.readRawResource(getApplication(), 
 R.raw.sample_json));
 PeopleListJson plJson =new Gson().fromJson(jsonText,       
 PeopleListJson.class);
 FlatBufferBuilder fbb =new FlatBufferBuilder();
int[] peopleOffset =new int[plJson.peoples.size()];
int i =0;
 for (PeopleJson people : plJson.peoples) {
int idOffset = fbb.createString(people.id);

int genderOffset = fbb.createString(people.gender);

int guidOffset = fbb.createString(people.guid);

int nameOffset = fbb.createString(people.name);

int companyOffset = fbb.createString(people.company);

int emailOffset = fbb.createString(people.email);

int friendsOffset =0;

if (people.friends !=null && people.friends.size() !=0) {

int[] fOffsets =new int[people.friends.size()];

    int k =0;

    for (FriendJson fJson : people.friends) {

        int fnameOffset = fbb.createString(fJson.name);

        fOffsets[k] = Friend.createFriend(fbb,fJson.id,fnameOffset);

        k++;

    }

    //People中的frineds列表

    friendsOffset = People.createFriendsVector(fbb,fOffsets);

  }
  //PeopleList列表中的People
  peopleOffset[i] = People.createPeople(fbb,idOffset,people.index,
  guidOffset, nameOffset,genderOffset,companyOffset,emailOffset,
  friendsOffset);
   i++;
  }

  //相当于Array.addArray
int listOffset = PeopleList.createPeoplesVector(fbb,peopleOffset);

PeopleList.startPeopleList(fbb);

PeopleList.addPeoples(fbb,listOffset);

int endOffset = PeopleList.endPeopleList(fbb);

fbb.finish(endOffset);

long startTime = System.currentTimeMillis();

ByteBuffer bb = fbb.dataBuffer();

 PeopleList peopleList = PeopleList.getRootAsPeopleList(bb);

 Log.i(TAG, "peopleList size:" + peopleList.peoplesLength());

/* int length = peopleList.peoplesLength();

for (int m = 0; m < length; m++) {

People p = peopleList.peoples(m);

Log.i(TAG, "name:" + p.name() + " gender:" + p.gender() + " friends size:" + 
  p.friendsLength());
//+ "  end frined name:" + p.friends(p.friendsLength() - 1).name());
}*/
 long timeTaken = System.currentTimeMillis() - startTime;
String logText ="FlatBuffer : " + timeTaken +"ms";
textViewFlat.setText(logText);
Log.d(TAG, "loadFromFlatBuffer " + peopleList.toString());