就Android平臺而言，URI主要分三個部分：scheme, authority and path。其中authority又分為host和port。格式如下：
scheme://host:port/path
舉個實際的例子：
content://com.example.project:200/folder/subfolder/etc
\---------/? \---------------------------/ \---/ \--------------------------/
scheme???????????????? host?????????????? port??????? path
??????????????? \--------------------------------/
????????????????????????? authority? ?

現在大家應該知道data flag中那些屬性的含義了吧，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" />
但是我們在程序中一般是不直接用URI來標識CP的，是的，正如我們通常見到的用定義的常量來標識。例如standard CP中的Contacts，我們就用Contacts.People.CONTENT_URI來標識Contacts CP中People這個表。那么要標識某個具體的人怎么辦呢？ 這就用到了ContentUris.withAppendedId() 和 Uri.withAppendedPath()。例如我們要表示content://contacts/people/20，那么我們就可以用如下語句：
Uri uri = ContentUris.withAppendedId(People.CONTENT_URI, 20); 或者
Uri uri = Uri.withAppendedPath(People.CONTENT_URI, "20");

?

舉些例子，如：

所有聯系人的Uri： content://contacts/people

某個聯系人的Uri: content://contacts/people/5

所有圖片Uri: content://media/external

某個圖片的Uri：content://media/external/images/media/4

下面是一些常用的Uri

?

顯示網頁:
? 1. Uri uri = Uri.parse("http://www.google.com");
? 2. Intent it = new Intent(Intent.ACTION_VIEW,uri);
? 3. startActivity(it);

顯示地圖:
1. Uri uri = Uri.parse("geo:38.899533,-77.036476");
? 2. Intent it = new Intent(Intent.Action_VIEW,uri);
? 3. startActivity(it);

路徑規劃:
? 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);

撥打電話:
調用撥號程序
? 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. 要使用這個必須在配置文件中加入<uses-permission id="Android.permission.CALL_PHONE" />

發送SMS/MMS
調用發送短信的程序
? 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);???
發送短信
? 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);???
發送彩信
? 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);

發送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"));

播放多媒體
? 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);

//調用相冊
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);

//調用系統相機應用程序，并存儲拍下來的照片
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
/**未測試
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 apk
Uri installUri = Uri.fromParts("package", "xxx", null);
returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);
play audio
Uri playUri = Uri.parse("[url=]file:///sdcard/download/everything.mp3[/url]");
returnIt = new Intent(Intent.ACTION_VIEW, playUri);

//發送附件
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"));

//搜索應用
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

//進入聯系人頁面
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setData(People.CONTENT_URI);
startActivity(intent);

//查看指定聯系人
Uri personUri = ContentUris.withAppendedId(People.CONTENT_URI, info.id);//info.id聯系人ID
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setData(personUri);
startActivity(intent);

總結

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