Types of intents

implicit intent
-action, data uri, category, components, extras

Implicit Intent

Intent intent = new Intent(Intent.ACTION_SENDTO);
sendIntent.setData(Uri.parse("mailto:"));
sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Just Java order for " + name);
sendIntent.putExtra(Intent.EXTRA_TEXT, priceMessage);

if (sendIntent.resolveActivity(getPackageManager()) != null){
	startActivity(sendIntent);
}

Explicit Intent

Intent intent = new Intent(this, NumbersActivity.class);
startActivity(intent);