就Android平台而言，URI主要分三个部分：scheme, authority and path。其中authority又分为host和port。格式如下：
scheme://host:port/path举个实际的例子：content://com.example.project:200/folder/subfolder/etc\---------/ \---------------------------/ \---/ \--------------------------/scheme host port path \--------------------------------/ authority 现在大家应该知道data flag中那些属性的含义了吧，看下data flag<data android:host="string" android:mimeType="string" android:path="string" android:pathPattern="string" android:pathPrefix="string" android:port="string" android:scheme="string" />但是我们在程序中一般是不直接用URI来标识CP的，是的，正如我们通常见到的用定义的常量来标识。例如standard CP中的Contacts，我们就用Contacts.People.CONTENT_URI来标识Contacts CP中People这个表。那么要标识某个具体的人怎么办呢？ 这就用到了ContentUris.withAppendedId() 和 Uri.withAppendedPath()。例如我们要表示content://contacts/people/20，那么我们就可以用如下语句：Uri uri = ContentUris.withAppendedId(People.CONTENT_URI, 20); 或者Uri uri = Uri.withAppendedPath(People.CONTENT_URI, "20");
举些例子，如：
所有联系人的Uri： content://contacts/people
某个联系人的Uri: content://contacts/people/5
所有图片Uri: content://media/external
某个图片的Uri：content://media/external/images/media/4
下面是一些常用的Uri
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<uses-permission id="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. 2. Uri uri = Uri.parse("mailto:xxx@abc.com"); 3. Intent it = new Intent(Intent.ACTION_SENDTO, uri); 4. 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, "[url=]file:///sdcard/mysong.mp3[/url]"); 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("[url=]file:///sdcard/song.mp3[/url]"); 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);//调用相册public static final String MIME_TYPE_IMAGE_JPEG = "image/*";public static final int ACTIVITY_GET_IMAGE = 0;Intent getImage = new Intent(Intent.ACTION_GET_CONTENT); getImage.addCategory(Intent.CATEGORY_OPENABLE); getImage.setType(MIME_TYPE_IMAGE_JPEG);startActivityForResult(getImage, ACTIVITY_GET_IMAGE);//调用系统相机应用程序，并存储拍下来的照片Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); time = Calendar.getInstance().getTimeInMillis();intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/tucue", time + ".jpg")));startActivityForResult(intent, ACTIVITY_GET_CAMERA_IMAGE);uninstall apk/**未测试Uri uninstallUri = Uri.fromParts("package", "xxx", null);returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri);*/Uri packageURI = Uri.parse("package:"+wistatmap); Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI); startActivity(uninstallIntent);install apkUri installUri = Uri.fromParts("package", "xxx", null);returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);play audioUri playUri = Uri.parse("[url=]file:///sdcard/download/everything.mp3[/url]");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, "[url=]file:///sdcard/eoe.mp3[/url]"); 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//进入联系人页面Intent intent = new Intent();intent.setAction(Intent.ACTION_VIEW);intent.setData(People.CONTENT_URI);startActivity(intent);//查看指定联系人Uri personUri = ContentUris.withAppendedId(People.CONTENT_URI, info.id);//info.id联系人IDIntent intent = new Intent();intent.setAction(Intent.ACTION_VIEW);intent.setData(personUri);startActivity(intent);