How to Fix java.lang.NumberFormatException?

Java has a number of common language features such as identifiers, currying, and algebraic data types. The main language facility that programmers use to accomplish the majority of their tasks is the Java programming language itself.

java.lang.NumberFormatException: s == null

Santino on Mar 09, 2021

You can use TextUtils utility method like this,

if (!TextUtils.isEmpty(content_id) && TextUtils.isDigitsOnly(content_id)) {
    ids[0] = Integer.parseInt(content_id);
} else {
    ids[0] = 0;
}
and while setting content_id you can set like this, content_id = message.getContentId().toString(); instead of content_id.valueOf(message.getContentId().toString()) ;

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The java.lang.NumberFormatException is generally caused by an illegal attempt to use a non-numeric format string in a numeric field.

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How to Fix java.lang.NumberFormatException?

java.lang.NumberFormatException: s == null

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