How to putextras in navigationview android java?

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Java

Android

I want to put logged username in text view in navigationview header in MainActivity but the app crachs i did in layout and it works but in the header of navigationview it crachs how to solve the problem?

What I have tried:

I tried this code:


LoginActivity:

//Login button 
public void openMainActivity() {
		Intent intent = new Intent(this, MainActivity.class);
		 intent.putExtra("username", txt_username.getText().toString());
		startActivity(intent);
		txt_password.setText(null);
		txt_username.setText(null);
	}

MainActivity :

// Hello user textview
    txt_welcomeUser = (TextView) findViewById(R.id.txt_welcomeuser);
    Bundle extras = getIntent().getExtras();
    String username = null;
    if(extras != null){
        username = extras.getString("username");
        txt_welcomeUser.setText("WELCOME: " + username);
    }