Can you recommend any solution to save memory and load quickly in android?

Question

I have very big boolean array data.

How can i save memory and load this data quickly in android?

Sure you can use realm(realm provide speed what you want) – Ognev Zair Sep 30 '16 at 08:21 — Ognev Zair, Sep 30 '16 at 08:21

score 2 · Accepted Answer · edited May 23 '17 at 12:26

150 items of boolean are small amount of data for conventional mobile devices. You can save more than 1000 items at once within 1 second.

Method 1

Realm already supports byte[] as a datatype. You can use it by converting boolean array into byte array.

https://stackoverflow.com/a/26944410/361100

Method 2

As you know, boolean is just 1-bit(binary) data. There's lots of case to handle such bits, but for me, I love to handle it in naive manner.

Let say you have 160 items of boolean.
- true, false, ..., true, false
- It can be converted to 1 or 0: 1010101....1010110
1 hex string contains 4 bits.
- 1010 1110 0110 1100 can be expressed into AE6C
Likewise, 160 bits can be converted into 160/4=40 strings.
Just save 40 length strings to Realm or SharedPreference.
Want to load? no problem. Convert 40 length strings into 160 length boolean array.

I think it could consume less than 100ms as those converting process is pretty fast in modern mobile CPUs.

I prefer the `byte[]` solution, and it's really smart. – EpicPandaForce Sep 30 '16 at 09:02 — EpicPandaForce, Sep 30 '16 at 09:02

score 0 · Answer 2 · edited May 23 '17 at 10:34

0

Here are 4 possible soluzions:
1.) You can serialize an Object and save it to a file.
2.) You can use Gson library and convert the object to JSON and save it to a file or in preferences.
3.) You can use Realm library which is fast. They even claim that on some operations they are faster than SQLite.
For solution 1 see https://stackoverflow.com/a/33896724/1502079
For solution 2 see https://stackoverflow.com/a/16436363/1502079

edited May 23 '17 at 10:34

Community

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answered Sep 30 '16 at 08:12

vovahost

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there are like 300 more solutions – Tim Sep 30 '16 at 08:13
I think he needs a simple solution because he doesn't have much experience. – vovahost Sep 30 '16 at 08:14
It depends on the amount of data you want to save. It takes less than a second if you don't have much data. – vovahost Sep 30 '16 at 08:22
I used Realm in my projects and it's very fast and simple to use. But if you want a more specific solution then tell us some more details about your needs. – vovahost Sep 30 '16 at 08:26

Can you recommend any solution to save memory and load quickly in android?

2 Answers2