You should probably get familiar with basic programing paradigms before proceeding with your app, especially method return value.
The method you’re looking for should be something like this:
public String cekberhasil() {
for (int i = 0; i < GRID_AREA; i++)
if(mIndexes[0] == 0 && mIndexes[1]==1 && mIndexes[2]==2)
return "success";
else
return "";
}
And than compare return value
if( mPuzzle15.cekberhasil().equals("success")){
//do something
}
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solved How to get a string from a function class?