android - Use an intent to send data to my activity

Question

I have a server running that notifies the user with a statusbar notification that opens my main activity, how can I pass data to my activity trough that intent?

Answer 1

MainActivity

Intent intent = new Intent(MainActivity.this,SecondActivity.class);
intent.putExtra("extra_text", string); 
startActivity(intent);

SecondActivity

 String text = getIntent().getStringExtra("extra_text");