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Why is
TextView test = (TextView) findViewById(R.id.testTextView);
test.getText();
generating a null pointer exception? The id is correct, testTextView is correctly declared in my XML layout file.
535
How to fix the NullPointerException? To avoid NullPointerException we have to initialize the Textview component with the help of findviewbyid( ) method as shown below. The findViewbyId( ) takes the “id” value of the component as the parameter. This method helps locate the component present in the app.
In Java, the java. lang. NullPointerException is thrown when a reference variable is accessed (or de-referenced) and is not pointing to any object. This error can be resolved by using a try-catch block or an if-else condition to check if a reference variable is null before dereferencing it.
In short, NullPointerException is thrown when a program attempts to use an object reference, which has the null value. For example: public class SampleClass{ public static void main(String[] args){ String sampleString= null; System. out.
NullPointerException is a runtime exception in Java that occurs when a variable is accessed which is not pointing to any object and refers to nothing or null. Since the NullPointerException is a runtime exception, it doesn't need to be caught and handled explicitly in application code.
The only reason for findViewById to return null if you are passing a valid id is that you are either setting the wrong content view (with setContentView) or not setting a content view at all.
150
I think you might have written setContentView(..) after defining the TextView. Reverse these, and it should work.
Change:
TextView test = (TextView) findViewById(R.id.testTextView);
.
.
setContetView(..)
To:
setContetView(..)
.
.
TextView test = (TextView) findViewById(R.id.testTextView);
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