詳解Android系統中跨應用數據分享功能的實現

一個Andoird應用程序的重要的地方是他們有相互溝通和整合的能力，一個應用程序可以和另一個應用程序交互，接下來我們來看看Android應用之間的內容分享
當你構建Intent的時候，必須要指定Intent的Action觸發，定義Intent的Action例如ACTION_SEND，你大概可以猜到指定Action為ACTION_SEND的Intent的作用是從一個Activity發送數據到另一個Activity，甚至跨越不同的進程，將數據發送給另一個Activity，你需要指定數據和他的類型，系統將識別接收的Activity，並顯示他們給用戶（假如有多個選擇的時候）或者立即啟動Activity（只要一個選擇的時候）
1.發送文本內容：

最直接最常用的是用ACTION_SEND來從一個應用發送文本內容到另一個應用，例如，我們的內置浏覽器可以與任何頁面當前的URL來共享文字，下面的例子就是共享文本內容

Intent sendIntent = new Intent(); 
sendIntent.setAction(Intent.ACTION_SEND); 
//這裡是你發送的文本 
sendIntent.putExtra(Intent.EXTRA_TEXT, "我用手機測試分享內容"); 
sendIntent.setType("text/plain"); 
startActivity(sendIntent); 

假如你安裝了過濾Action為ACTION_SEND，MIMEtype為“text/plain”的應用程序，這個系統就會啟動，假如系統匹配到多個這樣子的應用程序，他就會彈出一個Dialog列出所有的應用供用戶選擇（一個選擇器），如下圖

可能你覺得上面的代碼很簡單，我很容易就能寫出來，可是你發現了沒有，當我們的手機裡面沒有地圖類型的應用程序，你執行startActivity方法，你的程序就會出現Crash（崩潰），所以我們需要先判斷下系統是否有這類型的應用程序，判斷也很簡單

public boolean hasApplication(Intent intent){ 
  PackageManager packageManager = getPackageManager(); 
  //查詢是否有該Intent的Activity 
  List<ResolveInfo> activities = packageManager.queryIntentActivities(intent, 0); 
  //activities裡面不為空就有，否則就沒有 
  return activities.size() > 0 ? true : false; 

所以我們在startActivity的時候要做上面的判斷，這樣子我們開發出來的程序才會更加的健壯，少一些Crash用戶體驗也會更好，假如每次都要判斷你師傅會覺得煩？所以我們也可以使用Intent的Intent.createChooser方法
他有如下優點
1.1 即使用戶選擇了默認的方式，選擇器仍然會彈出來
1.2 如果沒有匹配到這樣的應用程序，系統就會提示消息
1.3 你可以指定選擇器Dialog的標題

Intent sendIntent = new Intent(); 
sendIntent.setAction(Intent.ACTION_SEND); 
sendIntent.putExtra(Intent.EXTRA_TEXT, "我用手機測試分享內容"); 
sendIntent.setType("text/plain"); 
startActivity(Intent.createChooser(sendIntent, "我是彈出框的標題")); 

注：某些郵件類應用程序，如Gmail,我們可以使用putExtra(Intent.EXTRA_EMAIL, String[]) 添加一個字符串數組到Intent中

2.發送二進制內容

二進制內容的共享使用Action為ACTION_SEND，在設置適當的MIME類型，並且添加putExtra(Intent.EXTRA_STREAM, URI),下面是一個常用的共享圖片的代碼，也可以共享任何類型的二進制內容

Intent shareIntent = new Intent(); 
shareIntent.setAction(Intent.ACTION_SEND); 
shareIntent.putExtra(Intent.EXTRA_STREAM, uriToImage); 
shareIntent.setType("image/jpeg"); 
startActivity(Intent.createChooser(shareIntent, getResources().getText(R.string.send_to))); 

主要下面幾點：

• 你可以使用MIME type為“ */*” ,他只會匹配處理一般數據流的Activity
• 接收應用程序需要Uri指定數據的訪問權限
• 在SD卡的文件，我們使用File file = new File(filePath); Uri.fromFile(file),然後把他傳遞給Intent
• 在應用程序的目錄中，openFileOutput的模式為MODE_WORLD_READABLE，然後我們可以使用getFileStreamPath（）返回一個File，然後利用Uri.fromFile(file)傳遞給Intent
• 可以掃描圖像，視頻和音頻等媒體文件，添加到系統MediaStore使用SCANFILE()來掃描文件，掃描完成後會調用 onScanCompleted()回調方法來返回一個Uri
• 圖片使用insertImage()方法插入到系統MediaStore也會返回一個圖片的Uri

下面是共享圖片的例子：

Intent shareIntent = new Intent(); 
shareIntent.setAction(Intent.ACTION_SEND); 
File file = new File("mnt/sdcard/share.png"); 
    
System.out.println(Uri.fromFile(file)); 
shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file)); 
shareIntent.setType("image/jpeg"); 
startActivity(Intent.createChooser(shareIntent, "共享圖片")); 

選擇QQ空間後，圖片就顯示在那裡了，如下圖

我們要共享多個二進制內容利用Action為ACTION_SEND_MULTIPLE,下面是我們共享多張圖片

ArrayList<Uri> imageUris = new ArrayList<Uri>(); 
imageUris.add(imageUri1); // Add your image URIs here 
imageUris.add(imageUri2); 
 
Intent shareIntent = new Intent(); 
shareIntent.setAction(Intent.ACTION_SEND_MULTIPLE); 
shareIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, imageUris); 
shareIntent.setType("image/*"); 
startActivity(Intent.createChooser(shareIntent, "Share images to..")); 

下面我列出幾個常用的MIME type類型

• text/plain（純文本）
• text/html（HTML文檔）
• application/xhtml+xml（XHTML文檔）
• image/gif（GIF圖像）
• image/jpeg（JPEG圖像）【PHP中為：image/pjpeg】
• image/png（PNG圖像）【PHP中為：image/x-png】
• video/mpeg（MPEG動畫）
• application/octet-stream（任意的二進制數據）
• application/pdf（PDF文檔）
• application/msword（Microsoft Word文件）
• message/rfc822（RFC 822形式）
• multipart/alternative（HTML郵件的HTML形式和純文本形式，相同內容使用不同形式表示）
• application/x-www-form-urlencoded（使用HTTP的POST方法提交的表單）
• multipart/form-data（同上，但主要用於表單提交時伴隨文件上傳的場合）

Android所有支持的MIME type

sMimeTypeMap.loadEntry("application/andrew-inset", "ez"); 
   sMimeTypeMap.loadEntry("application/dsptype", "tsp"); 
   sMimeTypeMap.loadEntry("application/futuresplash", "spl"); 
   sMimeTypeMap.loadEntry("application/hta", "hta"); 
   sMimeTypeMap.loadEntry("application/mac-binhex40", "hqx"); 
   sMimeTypeMap.loadEntry("application/mac-compactpro", "cpt"); 
   sMimeTypeMap.loadEntry("application/mathematica", "nb"); 
   sMimeTypeMap.loadEntry("application/msaccess", "mdb"); 
   sMimeTypeMap.loadEntry("application/oda", "oda"); 
   sMimeTypeMap.loadEntry("application/ogg", "ogg"); 
   sMimeTypeMap.loadEntry("application/pdf", "pdf"); 
   sMimeTypeMap.loadEntry("application/pgp-keys", "key"); 
   sMimeTypeMap.loadEntry("application/pgp-signature", "pgp"); 
   sMimeTypeMap.loadEntry("application/pics-rules", "prf"); 
   sMimeTypeMap.loadEntry("application/rar", "rar"); 
   sMimeTypeMap.loadEntry("application/rdf+xml", "rdf"); 
   sMimeTypeMap.loadEntry("application/rss+xml", "rss"); 
   sMimeTypeMap.loadEntry("application/zip", "zip"); 
   sMimeTypeMap.loadEntry("application/vnd.android.package-archive", 
     "apk"); 
   sMimeTypeMap.loadEntry("application/vnd.cinderella", "cdy"); 
   sMimeTypeMap.loadEntry("application/vnd.ms-pki.stl", "stl"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.database", "odb"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.formula", "odf"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.graphics", "odg"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.graphics-template", 
     "otg"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.image", "odi"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.spreadsheet", "ods"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.spreadsheet-template", 
     "ots"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.text", "odt"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.text-master", "odm"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.text-template", "ott"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.oasis.opendocument.text-web", "oth"); 
   sMimeTypeMap.loadEntry("application/msword", "doc"); 
   sMimeTypeMap.loadEntry("application/msword", "dot"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.openxmlformats-officedocument.wordprocessingml.document", 
     "docx"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.openxmlformats-officedocument.wordprocessingml.template", 
     "dotx"); 
   sMimeTypeMap.loadEntry("application/vnd.ms-excel", "xls"); 
   sMimeTypeMap.loadEntry("application/vnd.ms-excel", "xlt"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", 
     "xlsx"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.openxmlformats-officedocument.spreadsheetml.template", 
     "xltx"); 
   sMimeTypeMap.loadEntry("application/vnd.ms-powerpoint", "ppt"); 
   sMimeTypeMap.loadEntry("application/vnd.ms-powerpoint", "pot"); 
   sMimeTypeMap.loadEntry("application/vnd.ms-powerpoint", "pps"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.openxmlformats-officedocument.presentationml.presentation", 
     "pptx"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.openxmlformats-officedocument.presentationml.template", 
     "potx"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.openxmlformats-officedocument.presentationml.slideshow", 
     "ppsx"); 
   sMimeTypeMap.loadEntry("application/vnd.rim.cod", "cod"); 
   sMimeTypeMap.loadEntry("application/vnd.smaf", "mmf"); 
   sMimeTypeMap.loadEntry("application/vnd.stardivision.calc", "sdc"); 
   sMimeTypeMap.loadEntry("application/vnd.stardivision.draw", "sda"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.stardivision.impress", "sdd"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.stardivision.impress", "sdp"); 
   sMimeTypeMap.loadEntry("application/vnd.stardivision.math", "smf"); 
   sMimeTypeMap.loadEntry("application/vnd.stardivision.writer", 
     "sdw"); 
   sMimeTypeMap.loadEntry("application/vnd.stardivision.writer", 
     "vor"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.stardivision.writer-global", "sgl"); 
   sMimeTypeMap.loadEntry("application/vnd.sun.xml.calc", "sxc"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.sun.xml.calc.template", "stc"); 
   sMimeTypeMap.loadEntry("application/vnd.sun.xml.draw", "sxd"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.sun.xml.draw.template", "std"); 
   sMimeTypeMap.loadEntry("application/vnd.sun.xml.impress", "sxi"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.sun.xml.impress.template", "sti"); 
   sMimeTypeMap.loadEntry("application/vnd.sun.xml.math", "sxm"); 
   sMimeTypeMap.loadEntry("application/vnd.sun.xml.writer", "sxw"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.sun.xml.writer.global", "sxg"); 
   sMimeTypeMap.loadEntry( 
     "application/vnd.sun.xml.writer.template", "stw"); 
   sMimeTypeMap.loadEntry("application/vnd.visio", "vsd"); 
   sMimeTypeMap.loadEntry("application/x-abiword", "abw"); 
   sMimeTypeMap.loadEntry("application/x-apple-diskimage", "dmg"); 
   sMimeTypeMap.loadEntry("application/x-bcpio", "bcpio"); 
   sMimeTypeMap.loadEntry("application/x-bittorrent", "torrent"); 
   sMimeTypeMap.loadEntry("application/x-cdf", "cdf"); 
   sMimeTypeMap.loadEntry("application/x-cdlink", "vcd"); 
   sMimeTypeMap.loadEntry("application/x-chess-pgn", "pgn"); 
   sMimeTypeMap.loadEntry("application/x-cpio", "cpio"); 
   sMimeTypeMap.loadEntry("application/x-debian-package", "deb"); 
   sMimeTypeMap.loadEntry("application/x-debian-package", "udeb"); 
   sMimeTypeMap.loadEntry("application/x-director", "dcr"); 
   sMimeTypeMap.loadEntry("application/x-director", "dir"); 
   sMimeTypeMap.loadEntry("application/x-director", "dxr"); 
   sMimeTypeMap.loadEntry("application/x-dms", "dms"); 
   sMimeTypeMap.loadEntry("application/x-doom", "wad"); 
   sMimeTypeMap.loadEntry("application/x-dvi", "dvi"); 
   sMimeTypeMap.loadEntry("application/x-flac", "flac"); 
   sMimeTypeMap.loadEntry("application/x-font", "pfa"); 
   sMimeTypeMap.loadEntry("application/x-font", "pfb"); 
   sMimeTypeMap.loadEntry("application/x-font", "gsf"); 
   sMimeTypeMap.loadEntry("application/x-font", "pcf"); 
   sMimeTypeMap.loadEntry("application/x-font", "pcf.Z"); 
   sMimeTypeMap.loadEntry("application/x-freemind", "mm"); 
   sMimeTypeMap.loadEntry("application/x-futuresplash", "spl"); 
   sMimeTypeMap.loadEntry("application/x-gnumeric", "gnumeric"); 
   sMimeTypeMap.loadEntry("application/x-go-sgf", "sgf"); 
   sMimeTypeMap.loadEntry("application/x-graphing-calculator", "gcf"); 
   sMimeTypeMap.loadEntry("application/x-gtar", "gtar"); 
   sMimeTypeMap.loadEntry("application/x-gtar", "tgz"); 
   sMimeTypeMap.loadEntry("application/x-gtar", "taz"); 
   sMimeTypeMap.loadEntry("application/x-hdf", "hdf"); 
   sMimeTypeMap.loadEntry("application/x-ica", "ica"); 
   sMimeTypeMap.loadEntry("application/x-internet-signup", "ins"); 
   sMimeTypeMap.loadEntry("application/x-internet-signup", "isp"); 
   sMimeTypeMap.loadEntry("application/x-iphone", "iii"); 
   sMimeTypeMap.loadEntry("application/x-iso9660-image", "iso"); 
   sMimeTypeMap.loadEntry("application/x-jmol", "jmz"); 
   sMimeTypeMap.loadEntry("application/x-kchart", "chrt"); 
   sMimeTypeMap.loadEntry("application/x-killustrator", "kil"); 
   sMimeTypeMap.loadEntry("application/x-koan", "skp"); 
   sMimeTypeMap.loadEntry("application/x-koan", "skd"); 
   sMimeTypeMap.loadEntry("application/x-koan", "skt"); 
   sMimeTypeMap.loadEntry("application/x-koan", "skm"); 
   sMimeTypeMap.loadEntry("application/x-kpresenter", "kpr"); 
   sMimeTypeMap.loadEntry("application/x-kpresenter", "kpt"); 
   sMimeTypeMap.loadEntry("application/x-kspread", "ksp"); 
   sMimeTypeMap.loadEntry("application/x-kword", "kwd"); 
   sMimeTypeMap.loadEntry("application/x-kword", "kwt"); 
   sMimeTypeMap.loadEntry("application/x-latex", "latex"); 
   sMimeTypeMap.loadEntry("application/x-lha", "lha"); 
   sMimeTypeMap.loadEntry("application/x-lzh", "lzh"); 
   sMimeTypeMap.loadEntry("application/x-lzx", "lzx"); 
   sMimeTypeMap.loadEntry("application/x-maker", "frm"); 
   sMimeTypeMap.loadEntry("application/x-maker", "maker"); 
   sMimeTypeMap.loadEntry("application/x-maker", "frame"); 
   sMimeTypeMap.loadEntry("application/x-maker", "fb"); 
   sMimeTypeMap.loadEntry("application/x-maker", "book"); 
   sMimeTypeMap.loadEntry("application/x-maker", "fbdoc"); 
   sMimeTypeMap.loadEntry("application/x-mif", "mif"); 
   sMimeTypeMap.loadEntry("application/x-ms-wmd", "wmd"); 
   sMimeTypeMap.loadEntry("application/x-ms-wmz", "wmz"); 
   sMimeTypeMap.loadEntry("application/x-msi", "msi"); 
   sMimeTypeMap.loadEntry("application/x-ns-proxy-autoconfig", "pac"); 
   sMimeTypeMap.loadEntry("application/x-nwc", "nwc"); 
   sMimeTypeMap.loadEntry("application/x-object", "o"); 
   sMimeTypeMap.loadEntry("application/x-oz-application", "oza"); 
   sMimeTypeMap.loadEntry("application/x-pkcs12", "p12"); 
   sMimeTypeMap.loadEntry("application/x-pkcs7-certreqresp", "p7r"); 
   sMimeTypeMap.loadEntry("application/x-pkcs7-crl", "crl"); 
   sMimeTypeMap.loadEntry("application/x-quicktimeplayer", "qtl"); 
   sMimeTypeMap.loadEntry("application/x-shar", "shar"); 
   sMimeTypeMap.loadEntry("application/x-shockwave-flash", "swf"); 
   sMimeTypeMap.loadEntry("application/x-stuffit", "sit"); 
   sMimeTypeMap.loadEntry("application/x-sv4cpio", "sv4cpio"); 
   sMimeTypeMap.loadEntry("application/x-sv4crc", "sv4crc"); 
   sMimeTypeMap.loadEntry("application/x-tar", "tar"); 
   sMimeTypeMap.loadEntry("application/x-texinfo", "texinfo"); 
   sMimeTypeMap.loadEntry("application/x-texinfo", "texi"); 
   sMimeTypeMap.loadEntry("application/x-troff", "t"); 
   sMimeTypeMap.loadEntry("application/x-troff", "roff"); 
   sMimeTypeMap.loadEntry("application/x-troff-man", "man"); 
   sMimeTypeMap.loadEntry("application/x-ustar", "ustar"); 
   sMimeTypeMap.loadEntry("application/x-wais-source", "src"); 
   sMimeTypeMap.loadEntry("application/x-wingz", "wz"); 
   sMimeTypeMap.loadEntry("application/x-webarchive", "webarchive"); 
   sMimeTypeMap.loadEntry("application/x-x509-ca-cert", "crt"); 
   sMimeTypeMap.loadEntry("application/x-x509-user-cert", "crt"); 
   sMimeTypeMap.loadEntry("application/x-xcf", "xcf"); 
   sMimeTypeMap.loadEntry("application/x-xfig", "fig"); 
   sMimeTypeMap.loadEntry("application/xhtml+xml", "xhtml"); 
   sMimeTypeMap.loadEntry("audio/3gpp", "3gpp"); 
   sMimeTypeMap.loadEntry("audio/basic", "snd"); 
   sMimeTypeMap.loadEntry("audio/midi", "mid"); 
   sMimeTypeMap.loadEntry("audio/midi", "midi"); 
   sMimeTypeMap.loadEntry("audio/midi", "kar"); 
   sMimeTypeMap.loadEntry("audio/mpeg", "mpga"); 
   sMimeTypeMap.loadEntry("audio/mpeg", "mpega"); 
   sMimeTypeMap.loadEntry("audio/mpeg", "mp2"); 
   sMimeTypeMap.loadEntry("audio/mpeg", "mp3"); 
   sMimeTypeMap.loadEntry("audio/mpeg", "m4a"); 
   sMimeTypeMap.loadEntry("audio/mpegurl", "m3u"); 
   sMimeTypeMap.loadEntry("audio/prs.sid", "sid"); 
   sMimeTypeMap.loadEntry("audio/x-aiff", "aif"); 
   sMimeTypeMap.loadEntry("audio/x-aiff", "aiff"); 
   sMimeTypeMap.loadEntry("audio/x-aiff", "aifc"); 
   sMimeTypeMap.loadEntry("audio/x-gsm", "gsm"); 
   sMimeTypeMap.loadEntry("audio/x-mpegurl", "m3u"); 
   sMimeTypeMap.loadEntry("audio/x-ms-wma", "wma"); 
   sMimeTypeMap.loadEntry("audio/x-ms-wax", "wax"); 
   sMimeTypeMap.loadEntry("audio/x-pn-realaudio", "ra"); 
   sMimeTypeMap.loadEntry("audio/x-pn-realaudio", "rm"); 
   sMimeTypeMap.loadEntry("audio/x-pn-realaudio", "ram"); 
   sMimeTypeMap.loadEntry("audio/x-realaudio", "ra"); 
   sMimeTypeMap.loadEntry("audio/x-scpls", "pls"); 
   sMimeTypeMap.loadEntry("audio/x-sd2", "sd2"); 
   sMimeTypeMap.loadEntry("audio/x-wav", "wav"); 
   sMimeTypeMap.loadEntry("image/bmp", "bmp"); 
   sMimeTypeMap.loadEntry("image/gif", "gif"); 
   sMimeTypeMap.loadEntry("image/ico", "cur"); 
   sMimeTypeMap.loadEntry("image/ico", "ico"); 
   sMimeTypeMap.loadEntry("image/ief", "ief"); 
   sMimeTypeMap.loadEntry("image/jpeg", "jpeg"); 
   sMimeTypeMap.loadEntry("image/jpeg", "jpg"); 
   sMimeTypeMap.loadEntry("image/jpeg", "jpe"); 
   sMimeTypeMap.loadEntry("image/pcx", "pcx"); 
   sMimeTypeMap.loadEntry("image/png", "png"); 
   sMimeTypeMap.loadEntry("image/svg+xml", "svg"); 
   sMimeTypeMap.loadEntry("image/svg+xml", "svgz"); 
   sMimeTypeMap.loadEntry("image/tiff", "tiff"); 
   sMimeTypeMap.loadEntry("image/tiff", "tif"); 
   sMimeTypeMap.loadEntry("image/vnd.djvu", "djvu"); 
   sMimeTypeMap.loadEntry("image/vnd.djvu", "djv"); 
   sMimeTypeMap.loadEntry("image/vnd.wap.wbmp", "wbmp"); 
   sMimeTypeMap.loadEntry("image/x-cmu-raster", "ras"); 
   sMimeTypeMap.loadEntry("image/x-coreldraw", "cdr"); 
   sMimeTypeMap.loadEntry("image/x-coreldrawpattern", "pat"); 
   sMimeTypeMap.loadEntry("image/x-coreldrawtemplate", "cdt"); 
   sMimeTypeMap.loadEntry("image/x-corelphotopaint", "cpt"); 
   sMimeTypeMap.loadEntry("image/x-icon", "ico"); 
   sMimeTypeMap.loadEntry("image/x-jg", "art"); 
   sMimeTypeMap.loadEntry("image/x-jng", "jng"); 
   sMimeTypeMap.loadEntry("image/x-ms-bmp", "bmp"); 
   sMimeTypeMap.loadEntry("image/x-photoshop", "psd"); 
   sMimeTypeMap.loadEntry("image/x-portable-anymap", "pnm"); 
   sMimeTypeMap.loadEntry("image/x-portable-bitmap", "pbm"); 
   sMimeTypeMap.loadEntry("image/x-portable-graymap", "pgm"); 
   sMimeTypeMap.loadEntry("image/x-portable-pixmap", "ppm"); 
   sMimeTypeMap.loadEntry("image/x-rgb", "rgb"); 
   sMimeTypeMap.loadEntry("image/x-xbitmap", "xbm"); 
   sMimeTypeMap.loadEntry("image/x-xpixmap", "xpm"); 
   sMimeTypeMap.loadEntry("image/x-xwindowdump", "xwd"); 
   sMimeTypeMap.loadEntry("model/iges", "igs"); 
   sMimeTypeMap.loadEntry("model/iges", "iges"); 
   sMimeTypeMap.loadEntry("model/mesh", "msh"); 
   sMimeTypeMap.loadEntry("model/mesh", "mesh"); 
   sMimeTypeMap.loadEntry("model/mesh", "silo"); 
   sMimeTypeMap.loadEntry("text/calendar", "ics"); 
   sMimeTypeMap.loadEntry("text/calendar", "icz"); 
   sMimeTypeMap.loadEntry("text/comma-separated-values", "csv"); 
   sMimeTypeMap.loadEntry("text/css", "css"); 
   sMimeTypeMap.loadEntry("text/html", "htm"); 
   sMimeTypeMap.loadEntry("text/html", "html"); 
   sMimeTypeMap.loadEntry("text/h323", "323"); 
   sMimeTypeMap.loadEntry("text/iuls", "uls"); 
   sMimeTypeMap.loadEntry("text/mathml", "mml"); 
   // add it first so it will be the default for ExtensionFromMimeType 
   sMimeTypeMap.loadEntry("text/plain", "txt"); 
   sMimeTypeMap.loadEntry("text/plain", "asc"); 
   sMimeTypeMap.loadEntry("text/plain", "text"); 
   sMimeTypeMap.loadEntry("text/plain", "diff"); 
   sMimeTypeMap.loadEntry("text/plain", "po");  // reserve "pot" for vnd.ms-powerpoint 
   sMimeTypeMap.loadEntry("text/richtext", "rtx"); 
   sMimeTypeMap.loadEntry("text/rtf", "rtf"); 
   sMimeTypeMap.loadEntry("text/texmacs", "ts"); 
   sMimeTypeMap.loadEntry("text/text", "phps"); 
   sMimeTypeMap.loadEntry("text/tab-separated-values", "tsv"); 
   sMimeTypeMap.loadEntry("text/xml", "xml"); 
   sMimeTypeMap.loadEntry("text/x-bibtex", "bib"); 
   sMimeTypeMap.loadEntry("text/x-boo", "boo"); 
   sMimeTypeMap.loadEntry("text/x-c++hdr", "h++"); 
   sMimeTypeMap.loadEntry("text/x-c++hdr", "hpp"); 
   sMimeTypeMap.loadEntry("text/x-c++hdr", "hxx"); 
   sMimeTypeMap.loadEntry("text/x-c++hdr", "hh"); 
   sMimeTypeMap.loadEntry("text/x-c++src", "c++"); 
   sMimeTypeMap.loadEntry("text/x-c++src", "cpp"); 
   sMimeTypeMap.loadEntry("text/x-c++src", "cxx"); 
   sMimeTypeMap.loadEntry("text/x-chdr", "h"); 
   sMimeTypeMap.loadEntry("text/x-component", "htc"); 
   sMimeTypeMap.loadEntry("text/x-csh", "csh"); 
   sMimeTypeMap.loadEntry("text/x-csrc", "c"); 
   sMimeTypeMap.loadEntry("text/x-dsrc", "d"); 
   sMimeTypeMap.loadEntry("text/x-haskell", "hs"); 
   sMimeTypeMap.loadEntry("text/x-java", "java"); 
   sMimeTypeMap.loadEntry("text/x-literate-haskell", "lhs"); 
   sMimeTypeMap.loadEntry("text/x-moc", "moc"); 
   sMimeTypeMap.loadEntry("text/x-pascal", "p"); 
   sMimeTypeMap.loadEntry("text/x-pascal", "pas"); 
   sMimeTypeMap.loadEntry("text/x-pcs-gcd", "gcd"); 
   sMimeTypeMap.loadEntry("text/x-setext", "etx"); 
   sMimeTypeMap.loadEntry("text/x-tcl", "tcl"); 
   sMimeTypeMap.loadEntry("text/x-tex", "tex"); 
   sMimeTypeMap.loadEntry("text/x-tex", "ltx"); 
   sMimeTypeMap.loadEntry("text/x-tex", "sty"); 
   sMimeTypeMap.loadEntry("text/x-tex", "cls"); 
   sMimeTypeMap.loadEntry("text/x-vcalendar", "vcs"); 
   sMimeTypeMap.loadEntry("text/x-vcard", "vcf"); 
   sMimeTypeMap.loadEntry("video/3gpp", "3gpp"); 
   sMimeTypeMap.loadEntry("video/3gpp", "3gp"); 
   sMimeTypeMap.loadEntry("video/3gpp", "3g2"); 
   sMimeTypeMap.loadEntry("video/dl", "dl"); 
   sMimeTypeMap.loadEntry("video/dv", "dif"); 
   sMimeTypeMap.loadEntry("video/dv", "dv"); 
   sMimeTypeMap.loadEntry("video/fli", "fli"); 
   sMimeTypeMap.loadEntry("video/m4v", "m4v"); 
   sMimeTypeMap.loadEntry("video/mpeg", "mpeg"); 
   sMimeTypeMap.loadEntry("video/mpeg", "mpg"); 
   sMimeTypeMap.loadEntry("video/mpeg", "mpe"); 
   sMimeTypeMap.loadEntry("video/mp4", "mp4"); 
   sMimeTypeMap.loadEntry("video/mpeg", "VOB"); 
   sMimeTypeMap.loadEntry("video/quicktime", "qt"); 
   sMimeTypeMap.loadEntry("video/quicktime", "mov"); 
   sMimeTypeMap.loadEntry("video/vnd.mpegurl", "mxu"); 
   sMimeTypeMap.loadEntry("video/x-la-asf", "lsf"); 
   sMimeTypeMap.loadEntry("video/x-la-asf", "lsx"); 
   sMimeTypeMap.loadEntry("video/x-mng", "mng"); 
   sMimeTypeMap.loadEntry("video/x-ms-asf", "asf"); 
   sMimeTypeMap.loadEntry("video/x-ms-asf", "asx"); 
   sMimeTypeMap.loadEntry("video/x-ms-wm", "wm"); 
   sMimeTypeMap.loadEntry("video/x-ms-wmv", "wmv"); 
   sMimeTypeMap.loadEntry("video/x-ms-wmx", "wmx"); 
   sMimeTypeMap.loadEntry("video/x-ms-wvx", "wvx"); 
   sMimeTypeMap.loadEntry("video/x-msvideo", "avi"); 
   sMimeTypeMap.loadEntry("video/x-sgi-movie", "movie"); 
   sMimeTypeMap.loadEntry("x-conference/x-cooltalk", "ice"); 
   sMimeTypeMap.loadEntry("x-epoc/x-sisx-app", "sisx"); 

3.接收圖片          
下面要分享的是從其他的應用程序接收內容，比如你開發了一個社交網絡的應用，你其中的某個Activity可以接受人們從其他的應用分享的東西，例如分享文字或者從圖庫分享圖片等等，接下來我們利用一個例子來講解從其他的應用接受內容
我們新建一個Android工程，名字為SharedContext，修改Manifest文件
我們需要在Manifest文件中定義這個Activity能接收什麼樣的Intent，我們需要創建Intent過濾器，使用 <intent-filter> 元素來過濾我們能接收的Intent，下面我們舉個簡單的例子，相信大家知道舉一反三，下面的例子我們的應用程序可以處理文本,文本文件，單一的圖片和多張圖片,我們定義Manifest文件如下

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
 package="com.example.sharedcontext" 
 android:versionCode="1" 
 android:versionName="1.0" > 
 
 <uses-sdk 
  android:minSdkVersion="8" 
  android:targetSdkVersion="16" /> 
 <application 
  android:allowBackup="true" 
  android:icon="@drawable/ic_launcher" 
  android:label="@string/app_name" 
  android:theme="@style/AppTheme" > 
  <activity 
   android:name="com.example.sharedcontext.MainActivity" 
   android:label="@string/app_name" > 
    
   <!-- 應用程序的啟動 Intent，我們例子只有一個Activity--> 
   <intent-filter> 
    <action android:name="android.intent.action.MAIN" /> 
    <category android:name="android.intent.category.LAUNCHER" /> 
   </intent-filter> 
 
   <!-- 處理文字的Intent 我們需要定義action, category, 和文字對應的MIME --> 
   <intent-filter> 
    <action android:name="android.intent.action.SEND" /> 
    <category android:name="android.intent.category.DEFAULT" /> 
    <data android:mimeType="text/*" /> 
   </intent-filter> 
 
   <!-- 處理單張圖片的Intent --> 
   <intent-filter> 
    <action android:name="android.intent.action.SEND" /> 
    <category android:name="android.intent.category.DEFAULT" /> 
    <data android:mimeType="image/*" /> 
   </intent-filter> 
 
   <!-- 處理多張圖片的Intent --> 
   <intent-filter> 
    <action android:name="android.intent.action.SEND_MULTIPLE" /> 
    <category android:name="android.intent.category.DEFAULT" /> 
    <data android:mimeType="image/*" /> 
   </intent-filter> 
  </activity> 
 </application 
</manifest> 

當一個應用程序構建上面那樣子的Intent，並吧它傳遞給StartActivity（），我們的應用程序就會被列在Intent選擇器中，當用戶選擇該應用程序就進入相對應的Activity（上面的例子是MainActivity）,我們只需要在MainActivity處理這樣內容並用相對應的UI顯示， MainActivity如下

package com.example.sharedcontext; 
 
import java.io.ByteArrayOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.ArrayList; 
 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.Bundle; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.BaseAdapter; 
import android.widget.GridView; 
import android.widget.ImageView; 
import android.widget.TextView; 
 
public class MainActivity extends Activity { 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  Intent intent = getIntent(); 
  //獲得Intent的Action 
  String action = intent.getAction(); 
  //獲得Intent的MIME type 
  String type = intent.getType(); 
   
   
  if(Intent.ACTION_SEND.equals(action) && type != null){ 
   //我們這裡處理所有的文本類型 
   if(type.startsWith("text/")){ 
    //處理獲取到的文本，這裡我們用TextView顯示 
    handleSendText(intent); 
   } 
   //圖片的MIME type有 image/png , image/jepg, image/gif 等， 
   else if(type.startsWith("image/")){ 
    //處理獲取到圖片，我們用ImageView顯示 
    handleSendImage(intent); 
   } 
  } 
  else if(Intent.ACTION_SEND_MULTIPLE.equals(action) && type != null){ 
    if (type.startsWith("image/")) { 
     //處理多張圖片，我們用一個GridView來顯示 
     handleSendMultipleImages(intent); 
    } 
  } 
 } 
 
 
 /** 
  * 用TextView顯示文本 
  * 可以打開一般的文本文件 
  * @param intent 
  */ 
 private void handleSendText(Intent intent){ 
   TextView textView = new TextView(this); 
   
   //一般的文本處理，我們直接顯示字符串 
   String sharedText = intent.getStringExtra(Intent.EXTRA_TEXT); 
   if(sharedText != null){ 
    textView.setText(sharedText); 
   } 
   
   
   //文本文件處理，從Uri中獲取輸入流，然後將輸入流轉換成字符串 
   Uri textUri = (Uri) intent.getParcelableExtra(Intent.EXTRA_STREAM); 
   if(textUri != null){ 
    try { 
     InputStream inputStream = this.getContentResolver().openInputStream(textUri); 
     textView.setText(inputStream2Byte(inputStream)); 
   } catch (Exception e) { 
    e.printStackTrace(); 
   } 
   } 
   
   //設置給Activity 
   setContentView(textView); 
 } 
  
  
 /** 
  * 將輸入流轉換成字符串 
  * @param inputStream 
  * @return 
  * @throws IOException 
  */ 
 private String inputStream2Byte(InputStream inputStream) throws IOException{ 
  ByteArrayOutputStream bos = new ByteArrayOutputStream(); 
   
  byte [] buffer = new byte[1024]; 
  int len = -1; 
   
  while((len = inputStream.read(buffer)) != -1){ 
   bos.write(buffer, 0, len); 
  } 
   
  bos.close(); 
   
  //指定編碼格式為UIT-8 
  return new String(bos.toByteArray(), "UTF-8"); 
 } 
  
  
 /** 
  * 用ImageView顯示單張圖片 
  * @param intent 
  */ 
 private void handleSendImage(Intent intent) { 
  Uri imageUri = (Uri) intent.getParcelableExtra(Intent.EXTRA_STREAM); 
  if (imageUri != null) { 
   ImageView imageView = new ImageView(this); 
   imageView.setImageURI(imageUri); 
   setContentView(imageView); 
  } 
 } 
  
  
 /** 
  * 用GridView顯示多張圖片 
  * @param intent 
  */ 
 private void handleSendMultipleImages(Intent intent) { 
  final ArrayList<Uri> imageUris = intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM); 
  if (imageUris != null) { 
   GridView gridView = new GridView(this); 
   //設置item的寬度 
   gridView.setColumnWidth(130); 
   //設置列為自動適應 
   gridView.setNumColumns(GridView.AUTO_FIT); 
   gridView.setAdapter(new GridAdapter(this, imageUris)); 
   setContentView(gridView); 
    
   gridView.setOnItemClickListener(new OnItemClickListener() { 
 
    @Override 
    public void onItemClick(AdapterView<?> parent, View view, 
      final int position, long id) { 
      
     //點擊GridView的item 可以分享圖片給其他應用 
     //這裡可以參考http://blog.csdn.net/xiaanming/article/details/9395991 
     Intent intent = new Intent(); 
     intent.setAction(Intent.ACTION_SEND); 
     intent.putExtra(Intent.EXTRA_STREAM, imageUris.get(position)); 
     intent.setType("image/*"); 
     startActivity(Intent.createChooser(intent, "共享圖片")); 
    } 
   }); 
    
  } 
 } 
  
 /** 
  * 重寫BaseAdapter 
  * @author xiaanming 
  * 
  */ 
 public class GridAdapter extends BaseAdapter{ 
  private Context mContext; 
  private ArrayList<Uri> list; 
   
  public GridAdapter(Context mContext, ArrayList<Uri> list){ 
   this.list = list; 
   this.mContext = mContext; 
  } 
 
  @Override 
  public int getCount() { 
   return list.size(); 
  } 
 
  @Override 
  public Object getItem(int position) { 
   return list.get(position); 
  } 
 
  @Override 
  public long getItemId(int position) { 
   return position; 
  } 
 
  @Override 
  public View getView(int position, View convertView, ViewGroup parent) { 
   ImageView imageView; 
   if(convertView == null){ 
    imageView = new ImageView(mContext); 
    imageView.setPadding(8, 8, 8, 8); 
   }else{ 
    imageView = (ImageView) convertView; 
   } 
   imageView.setImageURI(list.get(position)); 
   return imageView; 
  } 
 } 
} 

運行程序之後，然後我們選擇系統圖庫，選擇多張圖片（如圖一）進行分享，我們自己的應用程序分享多張界面（如圖二）點擊我們應用程序的item，選擇分享單張圖片（如圖三）我們繼續選擇我們自己的應用程序來顯示（如圖四），新建一個備忘錄保存，長按備忘錄進行分享（如圖五），分享文本文件的顯示界面（如圖六）