Android - Attempt to invoke virtual method 'boolean java.lang.String.contains(java.lang.CharSequence)' on a null object reference
49
What is a NullPointerException, and how do I fix it?
2116
IllegalArgumentException or NullPointerException for a null parameter?
158810
Why does >= return false when == returns true for null values?
78586
Why doesn't "System.out.println" work in Android?
80631
NullPointerException but compiling?
152733
How to simplify a null-safe compareTo() implementation?
33103
How come invoking a (static) method on a null reference doesn't throw NullPointerException?
33574
Comparing a string with the empty string (Java)
156262
One step check for null value & emptiness of a string
123797
Not equal  != operator on NULL
146476
Java: Why aren't NullPointerExceptions called NullReferenceExceptions?
8738
Should a retrieval method return 'null' or throw an exception when it can't produce the return value?
85964
Android: ClassNotFoundException when passing serializable object to Activity
38780
Checking for null before ToString()
64289
How does !!~ (not not tilde/bang bang tilde) alter the result of a 'contains/included' Array method call?
63172
Checking a null value in Objective-C that has been returned from a JSON string
149666
Why can't a null-reference exception name the object that has a null reference?