Getting an error while passing string using intent

Question

This is my main activity and im passing a string strname

Intent i = new Intent(getApplicationContext(),newpage.class);
            i.putExtra("firstname", strname);
            startActivity(i);

this is the new page where it will show this activity

TextView uname1 = (TextView) findViewById(R.id.textView15);
        uname1.setText(getIntent().getExtras().getString("firstname"));

my application closes when i press submit..

Possible duplicate of [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — Khemraj Sharma, Oct 30 '18 at 13:24
When are you initializing that TextView, and where and what is the NPE? — TheWanderer, Oct 30 '18 at 13:27
when i click submit on toasts its showing me all the values i have entered and then the app crashes — Ahsan Ajmal, Oct 30 '18 at 13:28
Please share full code with your activity names and error log — Uttam Panchasara, Oct 30 '18 at 13:30

score 0 · Answer 1 · answered Oct 30 '18 at 13:30

NullPointerException happens when you attempt to invoke a method in a null reference. For example getIntent().getExtras() in case getIntent() is null --> null.getExtras(), this will invoke a NPE.

Check if the intent is non-null before using it to avoid NullPointerException.

Intent intent = getIntent();
String firstName = "";
if (intent != null) {
    firstName = intent.getStringExtra("firstname");
}
uname1.setText(firstName);

score 0 · Answer 2 · answered Oct 30 '18 at 13:30

Check out the answer of this post: How do I pass data between Activities in Android application?

And try not to use ApplicationContext, but instead use BaseContext (see: difference and when to use getApplication(), getApplicationContext(), getBaseContext() and someClass.this)

score 0 · Answer 3 · answered Oct 30 '18 at 13:59

NullPointerException happens when you attempt to invoke a method in a null reference.

getString like as

TextView uname1 = (TextView) findViewById(R.id.textView15);
if (intent.getStringExtra("firstname")!=null) {
uname1.setText(getIntent().getStringExtras("firstname"));
}

score 0 · Answer 4 · answered Oct 30 '18 at 14:10

Try:

Activity1:

Intent myIntent = new Intent(Activity1.this, Activity2.class); Bundle b = new Bundle(); b.putString("firstname", strname); myIntent.putExtras(b);

startActivity(myIntent);

Activity2:

Bundle b = getIntent().getExtras(); String value = b.getString("key"); uname1.setText(value);

Getting an error while passing string using intent

4 Answers4