Intent应该算是Android中特有的东西。你能够在Intent中指定程序要运行的动作（比方：view,edit,dial），以及程序运行到该动作时所须要的资料。都指定好后，仅仅要调用startActivity()，Android系统会自己主动寻找最符合你指定要求的应用程序，并运行该程序。

以下列出几种Intent的使用方法
 显示网页:

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

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

startActivity(it);
显示地图:

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

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

startActivity(it); 

路径规划:

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);

拨打电话:

调用拨号程序

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);

要使用这个必须在配置文件里增加<uses-permission id="android.permission.CALL_PHONE" /

发送SMS/MMS

调用发送短信的程序

Intent it = new Intent(Intent.ACTION_VIEW);   

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

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

startActivity(it);  

发送短信

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

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

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

startActivity(it); 

 
发送彩信

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); 

发送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"));   

加入附件


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"));

播放多媒体



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 程序

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

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

startActivity(it);

install apk

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

play audio

发送附件

1. Intent it = new Intent(Intent.ACTION_SEND);  
   
2. it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");  
   
3. it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/eoe.mp3");  
   
4. sendIntent.setType("audio/mp3");  
   
5. startActivity(Intent.createChooser(it, "Choose Email Client"));

market相关

//搜索应用
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 

//显示指定应用的具体页面（这个好像不支持了，找不到app_id）
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

Intent intent = new Intent();
intent.setAction(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY,"searchString")
startActivity(intent);