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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:

  1. Uri uri = Uri.parse("http://www.google.com");
  2. Intent it   = new Intent(Intent.ACTION_VIEW,uri);
  3. startActivity(it);
显示地图:
  1. Uri uri = Uri.parse("geo:38.899533,-77.036476");
  2. Intent it = new Intent(Intent.Action_VIEW,uri);
  3. startActivity(it);
路径规划:
  1. Uri uri = Uri.parse("http://maps.google.com/maps?f=d&saddr=startLat%20startLng&daddr=endLat%20endLng&hl=en");
  2. Intent it = new Intent(Intent.ACTION_VIEW,URI);
  3. startActivity(it);
拨打电话:
调用拨号程序
  1. Uri uri = Uri.parse("tel:xxxxxx");
  2. Intent it = new Intent(Intent.ACTION_DIAL, uri);  
  3. startActivity(it);  
  1. Uri uri = Uri.parse("tel.xxxxxx");
  2. Intent it =new Intent(Intent.ACTION_CALL,uri);
  3. 要使用这个必须在配置文件中加入android.permission.CALL_PHONE" />
发送SMS/MMS
调用发送短信的程序
  1. Intent it = new Intent(Intent.ACTION_VIEW);
  2. it.putExtra("sms_body", "The SMS text");
  3. it.setType("vnd.android-dir/mms-sms");
  4. startActivity(it);  
发送短信
  1. Uri uri = Uri.parse("smsto:0800000123");
  2. Intent it = new Intent(Intent.ACTION_SENDTO, uri);
  3. it.putExtra("sms_body", "The SMS text");
  4. startActivity(it);  
发送彩信
  1. Uri uri = Uri.parse("content://media/external/images/media/23");
  2. Intent it = new Intent(Intent.ACTION_SEND);
  3. it.putExtra("sms_body", "some text");
  4. it.putExtra(Intent.EXTRA_STREAM, uri);
  5. it.setType("image/png");
  6. startActivity(it);
发送Email
  1. Uri uri = Uri.parse("mailto:xxx@abc.com");
  2. Intent it = new Intent(Intent.ACTION_SENDTO, uri);
  3. startActivity(it);
  1. Intent it = new Intent(Intent.ACTION_SEND);
  2. it.putExtra(Intent.EXTRA_EMAIL, "me@abc.com");
  3. it.putExtra(Intent.EXTRA_TEXT, "The email body text");
  4. it.setType("text/plain");
  5. startActivity(Intent.createChooser(it, "Choose Email Client"));  
  1. Intent it=new Intent(Intent.ACTION_SEND);    
  2. String[] tos={"me@abc.com"};    
  3. String[] ccs={"you@abc.com"};    
  4. it.putExtra(Intent.EXTRA_EMAIL, tos);    
  5. it.putExtra(Intent.EXTRA_CC, ccs);    
  6. it.putExtra(Intent.EXTRA_TEXT, "The email body text");    
  7. it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");    
  8. it.setType("message/rfc822");    
  9. startActivity(Intent.createChooser(it, "Choose Email Client"));
添加附件
  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/mysong.mp3");
  4. sendIntent.setType("audio/mp3");
  5. startActivity(Intent.createChooser(it, "Choose Email Client"));
播放多媒体
  1.   
  2. Intent it = new Intent(Intent.ACTION_VIEW);
  3. Uri uri = Uri.parse("file:///sdcard/song.mp3");
  4. it.setDataAndType(uri, "audio/mp3");
  5. startActivity(it);
  1. Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");
  2. Intent it = new Intent(Intent.ACTION_VIEW, uri);
  3. startActivity(it);  
Uninstall 程序
  1. Uri uri = Uri.fromParts("package", strPackageName, null);
  2. Intent it = new Intent(Intent.ACTION_DELETE, uri);
  3. startActivity(it);