I am getting null pointer exception in android when calling findviewbyID

Question

<TextView
    android:id="@+id/longitude_val"
    android:layout_width="wrap_content"
    android:layout_height="14dp"
    android:text="Lattitude"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.194"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.373" />

Hi I am very confused, why i am getting error on findviewbyId
I am doing as following longitude_val=(TextView) longitude_val.findViewById(R.id.longitude_val);

the id in the xml is `Lattitude` , and you are trying to get it with the id `longitude_val` — Benkerroum Mohamed, Mar 23 '18 at 17:16
Is this in a fragment? if not it's just longitude_val = findViewById(R.id.Lattitude); — Janwilx72, Mar 23 '18 at 17:16
I am sorry i just mistyped. my id's are same in xml file and main activity — Ehtisham, Mar 24 '18 at 14:24

score 0 · Answer 1 · answered Mar 23 '18 at 17:18

0

You have defined this id for the TextView:

android:id="@+id/Lattitude"

this means you should stick to that id when you use findViewById too. You code should then be:

TextView yourTextView = findViewById(R.id.Lattitude);

answered Mar 23 '18 at 17:18

Gregorio Palamà

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I am sorry i just mistyped. my id's are same in xml file and main activity – Ehtisham Mar 24 '18 at 14:25

score 0 · Answer 2 · answered Mar 23 '18 at 17:18

0

You are getting an NPE because you are trying to find the id of an element that doesn't exist, longitude_val. Your id that you defined in your xml layout file is `Lattitude'. Your code to find this view should be this:

lattitudeTextView = (TextView) longitude_val.findViewById(R.id.Lattitude);

answered Mar 23 '18 at 17:18

Michael

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I am sorry i just mistyped. my id's are same in xml file and main activity – Ehtisham Mar 24 '18 at 14:25

score 0 · Answer 3 · answered Mar 23 '18 at 17:18

0

First of all you shouldn't name object in your java code in snake_case format.Use camelCase.

Second, your TextView had id of Lattitude and you're trying to assign an object to id of longitude_val.

Try this:

longitude_val=(TextView) longitude_val.findViewById(R.id.Lattitude);

answered Mar 23 '18 at 17:18

MakinTosH

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7
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I am sorry i just mistyped. my id's are same in xml file and main activity – Ehtisham Mar 24 '18 at 14:25

I am getting null pointer exception in android when calling findviewbyID

3 Answers3