Android Intents

explicit-intent.java

// Executed in an Activity, so 'this' is the context
Intent intent = new Intent(this, NumbersActivity.class);
startActivity(intent);

implicit-intent.java

// Create the text message with a string
Intent intent = new Intent(Intent.ACTION_SENDTO);
intent.setData(Uri.parse("mailto:"));
intent.putExtra(Intent.EXTRA_SUBJECT, "Just Java order for " + name);
intent.putExtra(Intent.EXTRA_TEXT, priceMessage);

// Verify that the intent will resolve properly
if(sendIntent.resolveActivity(getPackageManager()) != null){
  startActivity(intent);
}