[Solved] show 0 as prefix if value is less than 9

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As you seem to have strings that need to be (optionally) padded with zeros, you can use a different approach than generally used to pad integers:

public String addPadding(int length, String text) {
    StringBuilder sb = new StringBuilder();

    // First, add (length - 'length of text') number of '0'
    for (int i = length - text.length(); i > 0; i--) {
        sb.append('0');
    }

    // Next, add string itself
    sb.append(text);
    return sb.toString();
}

so you can use:

"B-" + // prefix
    addPadding(2, LoginActivity.strEventID) + "-" + // eventID 
    addPadding(2, LoginActivity.strOperativeID) + "-" + // operativeID 
    getNextNumber() + // counter 
    ".jpg"

There are lots of other possibilities to pad a String, see this question for more details/possibilities.

solved show 0 as prefix if value is less than 9