Convert List<Boolean> to byte [ ] array

Question

I have a list of booleans which I want to convert Byte [] arrays.I try to convert List to byte[] arrays but I have a mistake.This is my code

 List<Boolean> list = model.getBooleanData();
               boolean[] inputSleep = new boolean[list.size()];

               byte[] toReturn = new byte[inputSleep.length / 8];
               for (int entry = 0; entry < toReturn.length; entry++) {
                   for (int bit = 0; bit < 8; bit++) {
                       if (inputSleep[entry * 8 + bit]) {
                           toReturn[entry] |= (128 >> bit);
                       }
                   }
               }

I get all Booleans and checked but I try to this all Booleans false.Thanks your helps.How can I correctly convert List to byte[] arrays?

boolean[] inputSleep - all values are initialised to false - you never fill the array with your boolean data from list. Have model.getBooleanData() return a boolean[] directly - the List is pointless. — Mark
– Mark, Commented Apr 14, 2018 at 9:35
But I fill List from model and checked the model is filled to booleans.And than I checked inputSleep all values False. — TsigumEnes
– TsigumEnes, Commented Apr 14, 2018 at 9:40
Can you be sure that 8 divides into the list length? Otherwise list elements will be lost. — Anonymous
– Anonymous, Commented Apr 14, 2018 at 9:52
Ooo sorry man,I understand now If I set the inputSleep from List Booleans all inputsleep values not to be false.I'll try ) — TsigumEnes
– TsigumEnes, Commented Apr 14, 2018 at 9:54

TsigumEnes · Accepted Answer · 2018-04-14 10:43:37Z

2

Yeap thank you guys I solved the problem. This is the right code. Maybe this solution needs someone)

 List<Boolean> list = model.getBooleanData();
               Boolean[] inputSleep = new Boolean[list.size()];
               inputSleep = list.toArray(inputSleep);


               byte[] toReturn = new byte[inputSleep.length / 8];
               for (int entry = 0; entry < toReturn.length; entry++) {
                   for (int bit = 0; bit < 8; bit++) {
                       if (inputSleep[entry * 8 + bit]) {
                           toReturn[entry] |= (128 >> bit);
                       }
                   }
               }

answered Apr 14, 2018 at 10:43

TsigumEnes

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