在manifest文件里->activity 添加

<intent-filter>

<action android:name="android.intent.action.VIEW" />

<category android:name="android.intent.category.DEFAULT" />

<data android:mimeType="*/*">

</intent-filter>

这样就把当前程序注册为 可以打开/查看所有类型的文件. 或者要查看jpeg, mimeType要改为: image/jpeg

当在文件管理器里点击任何文件, 系统都会试图去执行你的程序.

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http://blog.csdn.net/aide1986/archive/2010/04/27/5536530.aspx

一个合法的File Manager在执行Open动作时，应该是发出一个Intent.VIEW Action。所以你的intent-filter应该是这样子的：

在这当中，data块缺一不可，你必须同时申明android:scheme, android:host, android:pathPattern, 方可令pathPattern正确生效。对于content scheme，将会匹配诸如：content://com.metago.astro.filesystem/sdcard/txt /pg17155.txt 这样的请求，你的Activity将可以有效地打开这样的txt文件。对于file scheme，大致会匹配诸如：file:///sdcard/txt/pg17155.txt这样的请求，并且，如果有必要，你可以加入 android:mimeType限定。

也就是说，尽管Android SDK的层面上，你不可能了解到哪些mime已经注册，一个自定义的mime如何注册，但对于基础系统(linux os layer)来说，内置的mime type还是存在的，这方面你可以参考Intent SDK文档和Notebook SDK Sample获得一鳞半爪的信息。

对于你自己想要关联的文件后缀，则应该使用上面的intent-filter组合来完成关联。
一旦intent-filter关联完成，在Activity的onCreate，onNewIntent中将可通过：
Intent intent=getIntent();
Uri uri=(Uri)intent.getData();
String path=uri.getPath();
序列获得关联打开文件的绝对路径。

这样的方法在ASTRO文件管理器中测试通过，并且在另一个测试project中进行了测试和证明机制有效。不过，在Root Explorer，And Explorer中均失败了，原因正在于这几个浏览器并不执行符合Android SDK规范的File Open操作。
可见，随意性是值得注意的坏招数。

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我们看一下 android 文件的mime类型：

另：

3gp video/3gpp
　　aab application/x-authoware-bin
　　aam application/x-authoware-map
　　aas application/x-authoware-seg
　　ai application/postscript
　　aif audio/x-aiff
　　aifc audio/x-aiff
　　aiff audio/x-aiff
　　als audio/X-Alpha5
　　amc application/x-mpeg
　　ani application/octet-stream

apk application/vnd.android.package-archive
　　asc text/plain
　　asd application/astound
　　asf video/x-ms-asf
　　asn application/astound
　　asp application/x-asap
　　asx video/x-ms-asf
　　au audio/basic
　　avb application/octet-stream
　　avi video/x-msvideo
　　awb audio/amr-wb
　　bcpio application/x-bcpio
　　bin application/octet-stream
　　bld application/bld
　　bld2 application/bld2
      bmp image/bmp
　　bpk application/octet-stream
　　bz2 application/x-bzip2
　　cal image/x-cals
　　ccn application/x-cnc
　　cco application/x-cocoa
　　cdf application/x-netcdf
　　cgi magnus-internal/cgi
　　chat application/x-chat
　　class application/octet-stream
　　clp application/x-msclip
　　cmx application/x-cmx
　　co application/x-cult3d-object
　　cod image/cis-cod
　　cpio application/x-cpio
　　cpt application/mac-compactpro
　　crd application/x-mscardfile
　　csh application/x-csh
　　csm chemical/x-csml
　　csml chemical/x-csml
　　css text/css
　　cur application/octet-stream
　　dcm x-lml/x-evm
　　dcr application/x-director
　　dcx image/x-dcx
　　dhtml text/html
　　dir application/x-director
　　dll application/octet-stream
　　dmg application/octet-stream
　　dms application/octet-stream
　　doc application/msword
　　dot application/x-dot
　　dvi application/x-dvi
　　dwf drawing/x-dwf
　　dwg application/x-autocad
　　dxf application/x-autocad
　　dxr application/x-director
　　ebk application/x-expandedbook
　　emb chemical/x-embl-dl-nucleotide
　　embl chemical/x-embl-dl-nucleotide
　　eps application/postscript
　　eri image/x-eri
　　es audio/echospeech
　　esl audio/echospeech
　　etc application/x-earthtime
　　etx text/x-setext
　　evm x-lml/x-evm
　　evy application/x-envoy
　　exe application/octet-stream
　　fh4 image/x-freehand
　　fh5 image/x-freehand
　　fhc image/x-freehand
　　fif image/fif
　　fm application/x-maker
　　fpx image/x-fpx
　　fvi video/isivideo
　　gau chemical/x-gaussian-input
　　gca application/x-gca-compressed
　　gdb x-lml/x-gdb
　　gif image/gif
　　gps application/x-gps
　　gtar application/x-gtar
　　gz application/x-gzip
　　hdf application/x-hdf
　　hdm text/x-hdml
　　hdml text/x-hdml
　　hlp application/winhlp
　　hqx application/mac-binhex40
　　htm text/html
　　html text/html
　　hts text/html
　　ice x-conference/x-cooltalk
　　ico application/octet-stream
　　ief image/ief
　　ifm image/gif
　　ifs image/ifs
　　imy audio/melody
　　ins application/x-NET-Install
　　ips application/x-ipscript
　　ipx application/x-ipix
　　it audio/x-mod
　　itz audio/x-mod
　　ivr i-world/i-vrml
　　j2k image/j2k
　　jad text/vnd.sun.j2me.app-descriptor
　　jam application/x-jam
　　jar application/java-archive
　　jnlp application/x-java-jnlp-file
　　jpe image/jpeg
　　jpeg image/jpeg
　　jpg image/jpeg
　　jpz image/jpeg
　　js application/x-javascript
　　jwc application/jwc
　　kjx application/x-kjx
　　lak x-lml/x-lak
　　latex application/x-latex
　　lcc application/fastman
　　lcl application/x-digitalloca
　　lcr application/x-digitalloca
　　lgh application/lgh
　　lha application/octet-stream
　　lml x-lml/x-lml
　　lmlpack x-lml/x-lmlpack
　　lsf video/x-ms-asf
　　lsx video/x-ms-asf
　　lzh application/x-lzh
　　m13 application/x-msmediaview
　　m14 application/x-msmediaview
　　m15 audio/x-mod
　　m3u audio/x-mpegurl
　　m3url audio/x-mpegurl
　　ma1 audio/ma1
　　ma2 audio/ma2
　　ma3 audio/ma3
　　ma5 audio/ma5
　　man application/x-troff-man
　　map magnus-internal/imagemap
　　mbd application/mbedlet
　　mct application/x-mascot
　　mdb application/x-msaccess
　　mdz audio/x-mod
　　me application/x-troff-me
　　mel text/x-vmel
　　mi application/x-mif
　　mid audio/midi
　　midi audio/midi
　　mif application/x-mif
　　mil image/x-cals
　　mio audio/x-mio
　　mmf application/x-skt-lbs
　　mng video/x-mng
　　mny application/x-msmoney
　　moc application/x-mocha
　　mocha application/x-mocha
　　mod audio/x-mod
　　mof application/x-yumekara
　　mol chemical/x-mdl-molfile
　　mop chemical/x-mopac-input
　　mov video/quicktime
　　movie video/x-sgi-movie
　　mp2 audio/x-mpeg
　　mp3 audio/x-mpeg
　　mp4 video/mp4
　　mpc application/vnd.mpohun.certificate
　　mpe video/mpeg
　　mpeg video/mpeg
　　mpg video/mpeg
　　mpg4 video/mp4
　　mpga audio/mpeg
　　mpn application/vnd.mophun.application
　　mpp application/vnd.ms-project
　　mps application/x-mapserver
　　mrl text/x-mrml
　　mrm application/x-mrm
　　ms application/x-troff-ms
　　mts application/metastream
　　mtx application/metastream
　　mtz application/metastream
　　mzv application/metastream
　　nar application/zip
　　nbmp image/nbmp
　　nc application/x-netcdf
　　ndb x-lml/x-ndb
　　ndwn application/ndwn
　　nif application/x-nif
　　nmz application/x-scream
　　nokia-op-logo image/vnd.nok-oplogo-color
　　npx application/x-netfpx
　　nsnd audio/nsnd
　　nva application/x-neva1
　　oda application/oda
　　oom application/x-AtlasMate-Plugin
　　pac audio/x-pac
　　pae audio/x-epac
　　pan application/x-pan
　　pbm image/x-portable-bitmap
　　pcx image/x-pcx
　　pda image/x-pda
　　pdb chemical/x-pdb
　　pdf application/pdf
　　pfr application/font-tdpfr
　　pgm image/x-portable-graymap
　　pict image/x-pict
　　pm application/x-perl
　　pmd application/x-pmd
　　png image/png
　　pnm image/x-portable-anymap
　　pnz image/png
　　pot application/vnd.ms-powerpoint
　　ppm image/x-portable-pixmap
　　pps application/vnd.ms-powerpoint
　　ppt application/vnd.ms-powerpoint
　　pqf application/x-cprplayer
　　pqi application/cprplayer
　　prc application/x-prc
　　proxy application/x-ns-proxy-autoconfig
　　ps application/postscript
　　ptlk application/listenup
　　pub application/x-mspublisher
　　pvx video/x-pv-pvx
　　qcp audio/vnd.qcelp
　　qt video/quicktime
　　qti image/x-quicktime
　　qtif image/x-quicktime
　　r3t text/vnd.rn-realtext3d
　　ra audio/x-pn-realaudio
　　ram audio/x-pn-realaudio
　　rar application/x-rar-compressed
　　ras image/x-cmu-raster
　　rdf application/rdf+xml
　　rf image/vnd.rn-realflash
　　rgb image/x-rgb
　　rlf application/x-richlink
　　rm audio/x-pn-realaudio
　　rmf audio/x-rmf
　　rmm audio/x-pn-realaudio
　　rmvb audio/x-pn-realaudio
　　rnx application/vnd.rn-realplayer
　　roff application/x-troff
　　rp image/vnd.rn-realpix
　　rpm audio/x-pn-realaudio-plugin
　　rt text/vnd.rn-realtext
　　rte x-lml/x-gps
　　rtf application/rtf
　　rtg application/metastream
　　rtx text/richtext
　　rv video/vnd.rn-realvideo
　　rwc application/x-rogerwilco
　　s3m audio/x-mod
　　s3z audio/x-mod
　　sca application/x-supercard
　　scd application/x-msschedule
　　sdf application/e-score
　　sea application/x-stuffit
　　sgm text/x-sgml
　　sgml text/x-sgml
　　sh application/x-sh
　　shar application/x-shar
　　shtml magnus-internal/parsed-html
　　shw application/presentations
　　si6 image/si6
　　si7 image/vnd.stiwap.sis
　　si9 image/vnd.lgtwap.sis
　　sis application/vnd.symbian.install
　　sit application/x-stuffit
　　skd application/x-Koan
　　skm application/x-Koan
　　skp application/x-Koan
　　skt application/x-Koan
　　slc application/x-salsa
　　smd audio/x-smd
　　smi application/smil
　　smil application/smil
　　smp application/studiom
　　smz audio/x-smd
　　snd audio/basic
　　spc text/x-speech
　　spl application/futuresplash
　　spr application/x-sprite
　　sprite application/x-sprite
　　spt application/x-spt
　　src application/x-wais-source
　　stk application/hyperstudio
　　stm audio/x-mod
　　sv4cpio application/x-sv4cpio
　　sv4crc application/x-sv4crc
　　svf image/vnd
　　svg image/svg-xml
　　svh image/svh
　　svr x-world/x-svr
　　swf application/x-shockwave-flash
　　swfl application/x-shockwave-flash
　　t application/x-troff
　　tad application/octet-stream
　　talk text/x-speech
　　tar application/x-tar
　　taz application/x-tar
　　tbp application/x-timbuktu
　　tbt application/x-timbuktu
　　tcl application/x-tcl
　　tex application/x-tex
　　texi application/x-texinfo
　　texinfo application/x-texinfo
　　tgz application/x-tar
　　thm application/vnd.eri.thm
　　tif image/tiff
　　tiff image/tiff
　　tki application/x-tkined
　　tkined application/x-tkined
　　toc application/toc
　　toy image/toy
　　tr application/x-troff
　　trk x-lml/x-gps
　　trm application/x-msterminal
　　tsi audio/tsplayer
　　tsp application/dsptype
　　tsv text/tab-separated-values
　　tsv text/tab-separated-values
　　ttf application/octet-stream
　　ttz application/t-time
　　txt text/plain
　　ult audio/x-mod
　　ustar application/x-ustar
　　uu application/x-uuencode
　　uue application/x-uuencode
　　vcd application/x-cdlink
　　vcf text/x-vcard
　　vdo video/vdo
　　vib audio/vib
　　viv video/vivo
　　vivo video/vivo
　　vmd application/vocaltec-media-desc
　　vmf application/vocaltec-media-file
　　vmi application/x-dreamcast-vms-info
　　vms application/x-dreamcast-vms
　　vox audio/voxware
　　vqe audio/x-twinvq-plugin
　　vqf audio/x-twinvq
　　vql audio/x-twinvq
　　vre x-world/x-vream
　　vrml x-world/x-vrml
　　vrt x-world/x-vrt
　　vrw x-world/x-vream
　　vts workbook/formulaone
　　wav audio/x-wav
　　wax audio/x-ms-wax
　　wbmp image/vnd.wap.wbmp
　　web application/vnd.xara
　　wi image/wavelet
　　wis application/x-InstallShield
　　wm video/x-ms-wm
　　wma audio/x-ms-wma
　　wmd application/x-ms-wmd
　　wmf application/x-msmetafile
　　wml text/vnd.wap.wml
　　wmlc application/vnd.wap.wmlc
　　wmls text/vnd.wap.wmlscript
　　wmlsc application/vnd.wap.wmlscriptc
　　wmlscript text/vnd.wap.wmlscript
　　wmv audio/x-ms-wmv
　　wmx video/x-ms-wmx
　　wmz application/x-ms-wmz
　　wpng image/x-up-wpng
　　wpt x-lml/x-gps
　　wri application/x-mswrite
　　wrl x-world/x-vrml
　　wrz x-world/x-vrml
　　ws text/vnd.wap.wmlscript
　　wsc application/vnd.wap.wmlscriptc
　　wv video/wavelet
　　wvx video/x-ms-wvx
　　wxl application/x-wxl
　　x-gzip application/x-gzip
　　xar application/vnd.xara
　　xbm image/x-xbitmap
　　xdm application/x-xdma
　　xdma application/x-xdma
　　xdw application/vnd.fujixerox.docuworks
　　xht application/xhtml+xml
　　xhtm application/xhtml+xml
　　xhtml application/xhtml+xml
　　xla application/vnd.ms-excel
　　xlc application/vnd.ms-excel
　　xll application/x-excel
　　xlm application/vnd.ms-excel
　　xls application/vnd.ms-excel
　　xlt application/vnd.ms-excel
　　xlw application/vnd.ms-excel
　　xm audio/x-mod
　　xml text/xml
　　xmz audio/x-mod
　　xpi application/x-xpinstall
　　xpm image/x-xpixmap
　　xsit text/xml
　　xsl text/xml
　　xul text/xul
　　xwd image/x-xwindowdump
　　xyz chemical/x-pdb
　　yz1 application/x-yz1
　　z application/x-compress
　　zac application/x-zaurus-zac
　　zip application/zip