intent 几种用法

Intent 应该算是Android中特有的东西。你可以在Intent中指定程序 要执行的动作（比如：view,edit,dial），以及程序执行到该动作时所需要的资料。都指定好后，只要调用startActivity()，Android系统会自动寻找最符合你指定要求的应用 程序，并执行该程序。

下面列出几种Intent 的用法
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=dsaddr=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 中加入<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"));    
添加附件:

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);

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

//显示指定应用的详细页面（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