一个andoird应用程序的重要的地方是他们有相互沟通和整合的能力，一个应用程序可以和另一个应用程序交互，接下来我们来看看android应用之间的内容分享
当你构建intent的时候，必须要指定intent的action触发，定义intent的action例如action_send，你大概可以猜到指定action为action_send的intent的作用是从一个activity发送数据到另一个activity，甚至跨越不同的进程，将数据发送给另一个activity，你需要指定数据和他的类型，系统将识别接收的activity，并显示他们给用户（假如有多个选择的时候）或者立即启动activity（只要一个选择的时候）
1.发送文本内容：
最直接最常用的是用action_send来从一个应用发送文本内容到另一个应用，例如，我们的内置浏览器可以与任何页面当前的url来共享文字，下面的例子就是共享文本内容
我要评论
intent sendintent = new intent();
sendintent.setaction(intent.action_send);
//这里是你发送的文本
sendintent.putextra(intent.extra_text, "我用手机测试分享内容");
sendintent.settype("text/plain");
startactivity(sendintent);
假如你安装了过滤action为action_send，mimetype为“text/plain”的应用程序，这个系统就会启动，假如系统匹配到多个这样子的应用程序，他就会弹出一个dialog列出所有的应用供用户选择（一个选择器），如下图
可能你觉得上面的代码很简单，我很容易就能写出来，可是你发现了没有，当我们的手机里面没有地图类型的应用程序，你执行startactivity方法，你的程序就会出现crash（崩溃），所以我们需要先判断下系统是否有这类型的应用程序，判断也很简单
public boolean hasapplication(intent intent){
packagemanager packagemanager = getpackagemanager();
//查询是否有该intent的activity
list<resolveinfo> activities = packagemanager.queryintentactivities(intent, 0);
//activities里面不为空就有，否则就没有
return activities.size() > 0 ? true : false;
所以我们在startactivity的时候要做上面的判断，这样子我们开发出来的程序才会更加的健壮，少一些crash用户体验也会更好，假如每次都要判断你师傅会觉得烦？所以我们也可以使用intent的intent.createchooser方法
他有如下优点
1.1 即使用户选择了默认的方式，选择器仍然会弹出来
1.2 如果没有匹配到这样的应用程序，系统就会提示消息
1.3 你可以指定选择器dialog的标题
intent sendintent = new intent();
sendintent.setaction(intent.action_send);
sendintent.putextra(intent.extra_text, "我用手机测试分享内容");
sendintent.settype("text/plain");
startactivity(intent.createchooser(sendintent, "我是弹出框的标题"));
注：某些邮件类应用程序，如gmail,我们可以使用putextra(intent.extra_email, string[]) 添加一个字符串数组到intent中
2.发送二进制内容
二进制内容的共享使用action为action_send，在设置适当的mime类型，并且添加putextra(intent.extra_stream, uri),下面是一个常用的共享图片的代码，也可以共享任何类型的二进制内容
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)));
主要下面几点：
下面是共享图片的例子：
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, "共享图片"));
选择qq空间后，图片就显示在那里了，如下图
我们要共享多个二进制内容利用action为action_send_multiple,下面是我们共享多张图片
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.."));
下面我列出几个常用的mime type类型
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.接收图片
下面要分享的是从其他的应用程序接收内容，比如你开发了一个社交网络的应用，你其中的某个activity可以接受人们从其他的应用分享的东西，例如分享文字或者从图库分享图片等等，接下来我们利用一个例子来讲解从其他的应用接受内容
我们新建一个android工程，名字为sharedcontext，修改manifest文件
我们需要在manifest文件中定义这个activity能接收什么样的intent，我们需要创建intent过滤器，使用 <intent-filter> 元素来过滤我们能接收的intent，下面我们举个简单的例子，相信大家知道举一反三，下面的例子我们的应用程序可以处理文本,文本文件，单一的图片和多张图片,我们定义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" >
<!-- 应用程序的启动 intent，我们例子只有一个activity-->
<intent-filter>
<action android:name="android.intent.action.main" />
<category android:name="android.intent.category.launcher" />
</intent-filter>
<!-- 处理文字的intent 我们需要定义action, category, 和文字对应的mime -->
<intent-filter>
<action android:name="android.intent.action.send" />
<category android:name="android.intent.category.default" />
<data android:mimetype="text/*" />
</intent-filter>
<!-- 处理单张图片的intent -->
<intent-filter>
<action android:name="android.intent.action.send" />
<category android:name="android.intent.category.default" />
<data android:mimetype="image/*" />
</intent-filter>
<!-- 处理多张图片的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>
当一个应用程序构建上面那样子的intent，并吧它传递给startactivity（），我们的应用程序就会被列在intent选择器中，当用户选择该应用程序就进入相对应的activity（上面的例子是mainactivity）,我们只需要在mainactivity处理这样内容并用相对应的ui显示， 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();
//获得intent的action
string action = intent.getaction();
//获得intent的mime type
string type = intent.gettype();
if(intent.action_send.equals(action) && type != null){
//我们这里处理所有的文本类型
if(type.startswith("text/")){
//处理获取到的文本，这里我们用textview显示
handlesendtext(intent);
}
//图片的mime type有 image/png , image/jepg, image/gif 等，
else if(type.startswith("image/")){
//处理获取到图片，我们用imageview显示
handlesendimage(intent);
}
}
else if(intent.action_send_multiple.equals(action) && type != null){
if (type.startswith("image/")) {
//处理多张图片，我们用一个gridview来显示
handlesendmultipleimages(intent);
}
}
}
/**
* 用textview显示文本
* 可以打开一般的文本文件
* @param intent
*/
private void handlesendtext(intent intent){
textview textview = new textview(this);
//一般的文本处理，我们直接显示字符串
string sharedtext = intent.getstringextra(intent.extra_text);
if(sharedtext != null){
textview.settext(sharedtext);
}
//文本文件处理，从uri中获取输入流，然后将输入流转换成字符串
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();
}
}
//设置给activity
setcontentview(textview);
}
/**
* 将输入流转换成字符串
* @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();
//指定编码格式为uit-8
return new string(bos.tobytearray(), "utf-8");
}
/**
* 用imageview显示单张图片
* @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显示多张图片
* @param intent
*/
private void handlesendmultipleimages(intent intent) {
final arraylist<uri> imageuris = intent.getparcelablearraylistextra(intent.extra_stream);
if (imageuris != null) {
gridview gridview = new gridview(this);
//设置item的宽度
gridview.setcolumnwidth(130);
//设置列为自动适应
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) {
//点击gridview的item 可以分享图片给其他应用
//这里可以参考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, "共享图片"));
}
});
}
}
/**
* 重写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;
}
}
}
运行程序之后，然后我们选择系统图库，选择多张图片（如图一）进行分享，我们自己的应用程序分享多张界面（如图二）点击我们应用程序的item，选择分享单张图片（如图三）我们继续选择我们自己的应用程序来显示（如图四），新建一个备忘录保存，长按备忘录进行分享（如图五），分享文本文件的显示界面（如图六）
如对本文有疑问， 点击进行留言回复！！
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