在清单文件中，建立自己分享的Activity，然后在该Activity的标签下新增一个intent-filter,注意是新增一个，不要跟原先的一块，要不然不生效；

  <intent-filter>
                <action android:name="android.intent.action.SEND" />
                <data android:mimeType="*/*" />
                <category android:name="android.intent.category.DEFAULT" />
</intent-filter>

mimeType代表支持分享的类型：

  {".3gp", "video/3gpp"},
　　{".apk", "application/vnd.android.package-archive"},
　　{".asf", "video/x-ms-asf"},
　　{".avi", "video/x-msvideo"},
　　{".bin", "application/octet-stream"},
　　{".bmp", "image/bmp"},
　　{".c", "text/plain"},
　　{".class", "application/octet-stream"},
　　{".conf", "text/plain"},
　　{".cpp", "text/plain"},
　　{".doc", "application/msword"},
　　{".exe", "application/octet-stream"},
　　{".gif", "image/gif"},
　　{".gtar", "application/x-gtar"},
　　{".gz", "application/x-gzip"},
　　{".h", "text/plain"},
　　{".htm", "text/html"},
　　{".html", "text/html"},
　　{".jar", "application/java-archive"},
　　{".java", "text/plain"},
　　{".jpeg", "image/jpeg"},
　　{".jpg", "image/jpeg"},
　　{".js", "application/x-javascript"},
　　{".log", "text/plain"},
　　{".m3u", "audio/x-mpegurl"},
　　{".m4a", "audio/mp4a-latm"},
　　{".m4b", "audio/mp4a-latm"},
　　{".m4p", "audio/mp4a-latm"},
　　{".m4u", "video/vnd.mpegurl"},
　　{".m4v", "video/x-m4v"},
　　{".mov", "video/quicktime"},
　　{".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"},
　　{".msg", "application/vnd.ms-outlook"},
　　{".ogg", "audio/ogg"},
　　{".pdf", "application/pdf"},
　　{".png", "image/png"},
　　{".pps", "application/vnd.ms-powerpoint"},
　　{".ppt", "application/vnd.ms-powerpoint"},
　　{".prop", "text/plain"},
　　{".rar", "application/x-rar-compressed"},
　　{".rc", "text/plain"},
　　{".rmvb", "audio/x-pn-realaudio"},
　　{".rtf", "application/rtf"},
　　{".sh", "text/plain"},
　　{".tar", "application/x-tar"},
　　{".tgz", "application/x-compressed"},
　　{".txt", "text/plain"},
　　{".wav", "audio/x-wav"},
　　{".wma", "audio/x-ms-wma"},
　　{".wmv", "audio/x-ms-wmv"},
　　{".wps", "application/vnd.ms-works"},
　　{".xml", "text/xml"},
　　{".xml", "text/plain"},
　　{".z", "application/x-compress"},
　　{".zip", "application/zip"},
　　{"", "*/*"}

然后在界面中回去intent的action进行判断，并回去data的内容即可
详细查看官方文档：https://developer.android.com/guide/topics/manifest/data-element.html