Implementation of media library in Android

Go to media library implementation in Android

Author: Jl In { Tagshow (Event) } "> In Android, the media library is contentprovider { Tagshow (Event) } "> The implementation, the so-called media library, is not a resource manager, but a multimedia { Tagshow (Event) } "> File Management: multimedia files contain a lot of information, such as authors, years, albums, and covers. In Android, the provider is implemented in Frameworks/base/CORE /{ Tagshow (Event) } "> JAVA/Android/provider/mediastore. Java Packages/providers/mediaprovider/src/COM/Android/providers/media. Frameworks/base/Media/Java/Android/Media/mediascanner * Frameworks/base/Media/JNI/android_media _* The identification of specific media files is as follows: External/opencore/Android/mediascanner. cpp In addition, to help you manually control when to scan media files and obtain scanned messages, there are two additional items: Mediascannerpolicer, and mediascannerservice. The relationships between them are as follows: When there is an action_boot_completed, action_media_mounted or action_media_scanner_scan_file intent request, our service will start. However, it takes a long time to scan files. Therefore, this is an asynchronous process. There is a scanner, and there are two scanning points: External Storage { Tagshow (Event) } "> Device and/root/media. /* Audio */ Addfiletype ("MP3", file_type_mp3, "audio/MPEG "); Addfiletype ("m4a", file_type_m4a, "audio/MP4 "); Addfiletype ("WAV", file_type_wav, "audio/X-WAV "); Addfiletype ("Amr", file_type_amr, "audio/AMR "); Addfiletype ("AWB", file_type_awb, "audio/AMR-WB "); Addfiletype ("WMA", file_type_wma, "audio/X-MS-WMA "); Addfiletype ("Ogg", file_type_ogg, "application/Ogg "); Addfiletype ("mid", file_type_mid, "audio/Midi "); Addfiletype ("xmf", file_type_mid, "audio/Midi "); Addfiletype ("rtttl", file_type_mid, "audio/Midi "); Addfiletype ("SMF", file_type_smf, "audio/SP-Midi "); Addfiletype ("IMy", file_type_imy, "audio/imelody "); /* Video */ Addfiletype ("MP4", file_type_mp4, "Video/MP4 "); Addfiletype ("m4v", file_type_m4v, "Video/MP4 "); Addfiletype ("3GP", file_type_3gpp, "Video/3GPP "); Addfiletype ("3GPP", file_type_3gpp, "Video/3GPP "); Addfiletype ("3g2", file_type_3gpp2, "Video/3gpp2 "); Addfiletype ("3gpp2", file_type_3gpp2, "Video/3gpp2 "); Addfiletype ("WMV", file_type_wmv, "Video/X-MS-WMV "); /* Image */ Addfiletype ("jpg", file_type_jpeg, "image/JPEG "); Addfiletype ("Jpeg", file_type_jpeg, "image/JPEG "); Addfiletype ("GIF", file_type_gif, "image/GIF "); Addfiletype ("PNG", file_type_png, "image/PNG "); Addfiletype ("BMP", file_type_bmp, "image/X-MS-BMP "); Addfiletype ("wbmp", file_type_wbmp, "image/vnd. WAP. wbmp "); /* Audio play list */ Addfiletype ("M3U", file_type_m3u, "audio/X-mpegurl "); Addfiletype ("pls", file_type_pls, "audio/X-scpls "); Addfiletype ("WPL", file_type_wpl, "application/vnd. MS-WPL "); For details about how to parse the code, see mediascanner. cpp.