Multi tool use

I have an 'if' statement for checking null pointer exception but that line itself is giving a null pointer excpetion

Code

if (dataSnapshot.child("Email").getValue().toString()==null) {
Email.setText("Email not found");
} else {
Email.setText(dataSnapshot.child("Email").getValue().toString());
}

if (dataSnapshot.child("Quote").getValue().toString()!=null) {
Email.setText(dataSnapshot.child("Quote").getValue().toString());
} else {
Email.setText("Quote not found");
}


The line of the if statement is itself showing an error. How do I solve this problem?

if

LogCat

if

nullPointerExceprion

3 Answers
3

Here is how you can rewrite it:

if(dataSnapshot != null && dataSnapshot.hasChild("Email") && dataSnapshot.child("Email").getValue() != null ){
//Your code...
}


You have to check for all possibilities.

You're checking if the toString() value is null. Only that value.

toString()

You're not checking any of the values that precedes it.

dataSnapshot could be null.
dataSnapshot.child("Email") could be null.
dataSnapshot.child("Email").getValue() could be null.

dataSnapshot

dataSnapshot.child("Email")

dataSnapshot.child("Email").getValue()

Take each value, save it to a variable, and do a null check on ALL those values.

This is the only way to do it in Java.

if (dataSnapshot.child("Email").getValue().toString()==null) {

}


install a breakpoint before if and debug it. I think either dataSnapshot is null or dataSnapshot.child("Email") is resulting null which is causing err.

dataSnapshot

dataSnapshot.child("Email")

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