Useful intents/actions that I've used

Favourite Intents

These are, or at least seem to be, the harder to find intents or the ones I use most commonly. There are also published ones at http://developer.android.com/guide/appendix/g-app-intents.html

Google Navigation

Launch Google's Navigation By Location - Driving

new Intent(Intent.ACTION_VIEW, Uri.parse("google.navigation:ll=" + mLatitude + "," + mLongitude));

Launch Google's Navigation By Location - Walking

new Intent(Intent.ACTION_VIEW, Uri.parse("google.navigation:ll=" + mLatitude + "," + mLongitude + "&mode=w"));

Launch Google's Navigation By Address - Driving

new Intent(Intent.ACTION_VIEW, Uri.parse("google.navigation:q=an+address+city"));

Google Map with Pin

new Intent(android.content.Intent.ACTION_VIEW, Uri.parse("geo:0,0?q=51.123456,-114.123456 (" + pinName + ")");

Google/HTC Calendar

Launch Google's Calendar - non-standard

Intent calendarIntent = new Intent();

calendarIntent.setClassName("com.android.calendar", "com.android.calendar.AgendaActivity");

or

Intent calendarIntent = new Intent();

calendarIntent.setClassName("com.google.android.calendar", "com.android.calendar.LaunchActivity");

Launch HTC's Calendar

Intent calendarIntent = new Intent(Intent.ACTION_MAIN);

calendarIntent.setComponent(new ComponentName("com.htc.calendar", "com.htc.calendar.MonthActivity"));

Use the package manager to determine which one is active on the device.

final PackageManager packageManager = getPackageManager();

List<ResolveInfo> list = packageManager.queryIntentActivities(calendarIntent, 0);

if ( list.isEmpty()) { ....