//show webapp

Uri uri = Uri.parse("http://www.google.com");

Intent it  = new Intent(Intent.ACTION_VIEW,uri);

startActivity(it);

//show maps:

Uri uri = Uri.parse("geo:38.899533,-77.036476");

Intent it = new Intent(Intent.Action_VIEW,uri);

startActivity(it); 

//show ways

Uri uri = Uri.parse("http://maps.google.com/maps?f=d&saddr=startLat%20startLng&daddr=endLat%20endLng&hl=en");

Intent it = new Intent(Intent.ACTION_VIEW,URI);

startActivity(it);

//call dial program

Uri uri = Uri.parse("tel:xxxxxx");

Intent it = new Intent(Intent.ACTION_DIAL, uri);  

startActivity(it);  

Uri uri = Uri.parse("tel.xxxxxx");

Intent it =new Intent(Intent.ACTION_CALL,uri);

//don't forget add this config:<uses-permission id="android.permission.CALL_PHONE" />

//send sms/mms

//call sender program

Intent it = new Intent(Intent.ACTION_VIEW);   

it.putExtra("sms_body", "The SMS text");   

it.setType("vnd.android-dir/mms-sms");   

startActivity(it);  

//send sms

Uri uri = Uri.parse("smsto:0800000123");   

Intent it = new Intent(Intent.ACTION_SENDTO, uri);   

it.putExtra("sms_body", "The SMS text");   

startActivity(it);  

//send mms

Uri uri = Uri.parse("content://media/external/images/media/23");   

Intent it = new Intent(Intent.ACTION_SEND);   

it.putExtra("sms_body", "some text");   

it.putExtra(Intent.EXTRA_STREAM, uri);   

it.setType("image/png");   

startActivity(it); 

//send email

Uri uri = Uri.parse("mailto:xxx@abc.com");

Intent it = new Intent(Intent.ACTION_SENDTO, uri);

startActivity(it);

Intent it = new Intent(Intent.ACTION_SEND);   

it.putExtra(Intent.EXTRA_EMAIL, "me@abc.com");   

it.putExtra(Intent.EXTRA_TEXT, "The email body text");   

it.setType("text/plain");   

startActivity(Intent.createChooser(it, "Choose Email Client"));  

Intent it=new Intent(Intent.ACTION_SEND);     

String[] tos={"me@abc.com"};     

String[] ccs={"you@abc.com"};     

it.putExtra(Intent.EXTRA_EMAIL, tos);     

it.putExtra(Intent.EXTRA_CC, ccs);     

it.putExtra(Intent.EXTRA_TEXT, "The email body text");     

it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");     

it.setType("message/rfc822");     

startActivity(Intent.createChooser(it, "Choose Email Client"));   

//add extra

Intent it = new Intent(Intent.ACTION_SEND);   

it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");   

it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/mysong.mp3");   

sendIntent.setType("audio/mp3");   

startActivity(Intent.createChooser(it, "Choose Email Client"));

//play media

Intent it = new Intent(Intent.ACTION_VIEW);

Uri uri = Uri.parse("file:///sdcard/song.mp3");

it.setDataAndType(uri, "audio/mp3");

startActivity(it);

Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");   

Intent it = new Intent(Intent.ACTION_VIEW, uri);   

startActivity(it);  

//Uninstall

Uri uri = Uri.fromParts("package", strPackageName, null);   

Intent it = new Intent(Intent.ACTION_DELETE, uri);   

startActivity(it);

//uninstall apk

Uri uninstallUri = Uri.fromParts("package", "xxx", null);

returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri);

//install apk

Uri installUri = Uri.fromParts("package", "xxx", null);

returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);

//play audio

Uri playUri = Uri.parse("file:///sdcard/download/everything.mp3");

returnIt = new Intent(Intent.ACTION_VIEW, playUri);

//send extra

Intent it = new Intent(Intent.ACTION_SEND);  

it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");  

it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/eoe.mp3");  

sendIntent.setType("audio/mp3");  

startActivity(Intent.createChooser(it, "Choose Email Client"));

//search

Uri uri = Uri.parse("market://search?q=pname:pkg_name");  

Intent it = new Intent(Intent.ACTION_VIEW, uri);  

startActivity(it);  

//where pkg_name is the full package path for an application  

//show program detail page

Uri uri = Uri.parse("market://details?id=app_id");  

Intent it = new Intent(Intent.ACTION_VIEW, uri);  

startActivity(it);  

//where app_id is the application ID, find the ID  

//by clicking on your application on Market home  

//page, and notice the ID from the address bar

//search google

Intent intent = new Intent();

intent.setAction(Intent.ACTION_WEB_SEARCH);

intent.putExtra(SearchManager.QUERY,"searchString")

startActivity(intent);

출처http://snipt.net/Martin/android-intent-usage/