ContentResolver Query utils

[danybony]

This PR adds a couple of methods useful for ContentResolver operations, when multiple selection arguments are needed.

ContentResolver operations can use ? for placeholders to be replaced from the content of the operation selectionArgs parameter. Every selectionArg, however, requires a dedicated placeholders.

For example the following code won't work:

String[] selectionArgs = {"1, 2, 3"};
contentResolver.delete(uri, "_id IN (?)", selectionArgs);

while this will:

String[] selectionArgs = {"1, 2, 3"};
contentResolver.delete(uri, "_id IN (?, ?, ?)", selectionArgs);

The two added methods allows to easily create both the selection part (?, ?, ... ?) and the selectionArgs String array

[amlcurran]

This would be a good thing to test (if notils has tests)

[danybony]

It does, good point 👍

[friedger]

the created string is for us with IN operators. Should be mentioned in the comment. It could also contain the operator and the brackets.

For other queries this is not a very common pattern for place holders.

[friedger]

should not contain Query in the name, as the class contains it.

[danybony]

👍 for removing Query from the name and mentioning IN in the comment.
I would avoid adding brackets and operator

[danybony]

@friedger @amlcurran method name updated and tests added

[friedger]

what about something like:

int sizeOfResult = size * 3 - 2;
char[] result = new char[sizeOfResult];
for (int i = 0; i < size -1; i++) {
  result[i] = '?';
  result[i + 1] = ',';
  result[i + 2] = ' ';
}
if (i > 0) {
  result[sizeOfResult - 1] = '?';
}
return new String(result);

it creates only two objects, instead of size + 5, and is still understandable and simple.