詳解Android系統中跨應用資料分享功能的實現

詳解Android系統中跨應用資料分享功能的實現
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一個Andoird應用程式的重要的地方是他們有相互溝通和整合的能力,一個應用程式可以和另一個應用程式互動,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傳送資料到另一個Activity,甚至跨越不同的程序,將資料傳送給另一個Activity,你需要指定資料和他的型別,系統將識別接收的Activity,並顯示他們給使用者(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.傳送文字內容:

最直接最常用的是用ACTION_SEND來從一個應用傳送文字內容到另一個應用,例如,我們的內建瀏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字內容


Intent sendIntent = new Intent(); 
sendIntent.setAction(Intent.ACTION_SEND); 
//這裡是你傳送的文字 
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”的應用程式,這個系統就會啟動,假如系統匹配到多個這樣子的應用程式,他就會彈出一個Dialog列出所有的應用供使用者選擇(一個選擇器),如下圖

https://codertw.com/wp-content/uploads/2018/07/20180703141010-5b3b83c2d62ce.png (290×550)

可能你覺得上面的程式碼很簡單,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型別的應用程式,你執行startActivity方法,你的程式就會出現Crash(崩潰),所以我們需要先判斷下系統是否有這型別的應用程式,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式才會更加的健壯,少一些Crash使用者體驗也會更好,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 即使使用者選擇了預設的方式,選擇器仍然會彈出來
1.2 如果沒有匹配到這樣的應用程式,系統就會提示訊息
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:某些郵件類應用程式,如Gmail,我們可以使用putExtra(Intent.EXTRA_EMAIL, String[]) 新增一個字串陣列到Intent中

2.傳送二進位制內容

二進位制內容的共享使用Action為ACTION_SEND,在設定適當的MIME型別,並且新增putExtra(Intent.EXTRA_STREAM, URI),下面是一個常用的共享圖片的程式碼,也可以共享任何型別的二進位制內容


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資料流的Activity
接收應用程式需要Uri指定資料的訪問許可權
在SD卡的檔案,我們使用File file = new File(filePath); Uri.fromFile(file),然後把他傳遞給Intent
在應用程式的目錄中,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
可以掃描影象,視訊和音訊等媒體檔案,新增到系統MediaStore使用SCANFILE()來掃描檔案,掃描完成後會呼叫 onScanCompleted()回撥方法來返回一個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

https://codertw.com/wp-content/uploads/2018/07/20180703141011-5b3b83c3ec360.png (290×550)

我們要共享多個二進位制內容利用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型別

text/plain(純文字)
text/html(HTML文件)
application/xhtml xml(XHTML文件)
image/gif(GIF影象)
image/jpeg(JPEG影象)【PHP中為:image/pjpeg】
image/png(PNG影象)【PHP中為:image/x-png】
video/mpeg(MPEG動畫)
application/octet-stream(任意的二進位制資料)
application/pdf(PDF文件)
application/msword(Microsoft Word檔案)
message/rfc822(RFC 822形式)
multipart/alternative(HTML郵件的HTML形式和純文字形式,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檔案上傳的場合)

Android所有支援的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式接收內容,比如你開發了一個社交網路的應用,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相簿分享圖片等等,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檔案
我們需要在Manifest檔案中定義這個Activity能接收什麼樣的Intent,我們需要建立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式可以處理文字,文字檔案,單一的圖片和多張圖片,我們定義Manifest檔案如下


<?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" > 
<!-- 應用程式的啟動 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> 

當一個應用程式構建上面那樣子的Intent,並吧它傳遞給StartActivity(),我們的應用程式就會被列在Intent選擇器中,當使用者選擇該應用程式就進入相對應的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字型別 
if(type.startsWith("text/")){ 
//處理獲取到的文字,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顯示文字 
* 可以開啟一般的文字檔案 
* @param intent 
*/ 
private void handleSendText(Intent intent){ 
TextView textView = new TextView(this); 
//一般的文字處理,我們直接顯示字串 
String sharedText = intent.getStringExtra(Intent.EXTRA_TEXT); 
if(sharedText != null){ 
textView.setText(sharedText); 
} 
//文字檔案處理,從Uri中獲取輸入流,然後將輸入流轉換成字串 
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(); 
} 
} 
//設定給Activity 
setContentView(textView); 
} 
/** 
* 將輸入流轉換成字串 
* @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); 
//設定item的寬度 
gridView.setColumnWidth(130); 
//設定列為自動適應 
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) { 
//點選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; 
} 
} 
} 

執行程式之後,然後我們選擇系統相簿,選擇多張圖片(如圖一)進行分享,我們自己的應用程式分享多張介面(如圖二)點選我們應用程式的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式來顯示(如圖四),新建一個備忘錄儲存,長按備忘錄進行分享(如圖五),分享文字檔案的顯示介面(如圖六)

https://codertw.com/wp-content/uploads/2018/07/20180703141012-5b3b83c4e0572.jpg (287×547)https://codertw.com/wp-content/uploads/2018/07/20180703141013-5b3b83c57f0e4.png (290×550)https://codertw.com/wp-content/uploads/2018/07/20180703141014-5b3b83c63c0c9.jpg (289×550)https://codertw.com/wp-content/uploads/2018/07/20180703141014-5b3b83c687de3.png (290×550)https://codertw.com/wp-content/uploads/2018/07/20180703141015-5b3b83c786120.png (290×550)https://codertw.com/wp-content/uploads/2018/07/20180703141016-5b3b83c8b52c2.png (290×550)

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