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// Send Data

Intent intent = new Intent(this, MainActivity.class);
Bundle bundle = new Bundle();
bundle.putString("message", "Text Changed");
intent.putExtra("data", bundle);
startActivity(intent);

// Receive Data

Bundle bundle = getIntent().getBundleExtra("data");
if (( bundle != null && !bundle.isEmpty())) {
    String sMessage = bundle.getString("message");
    textView.setText(sMessage);
}