Android如何獲得指定檔案的Uri

許多情況下，我們要獲得指定檔案的Uri，費話不多說直接上代碼：

通過已知路徑來獲得audio檔案的uri

/** * 尋找在於SDcard中的Audio檔案對應於MediaStore  的uri * @param file 音頻檔案 * @return */public Uri queryUriforAudio(File file){final String where = MediaStore.Audio.Media.DATA + "='"+file.getAbsolutePath()+"'";Cursor cursor=query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, where, null, null);if (cursor == null) {return null;}int id = -1;if (cursor != null) {cursor.moveToFirst();if (!cursor.isAfterLast()) {id = cursor.getInt(0);}cursor.close();}if(id==-1){return null;}return Uri.withAppendedPath(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, String.valueOf(id));}

關於Video的可能有些不同，見代碼

/** * 尋找視頻檔案對應於MediaStore的Uri * @param file 視頻檔案  * @return */private Uri queryUriForVideo(File file){int id = getId(file);if(id==-1){return null;}return Uri.withAppendedPath(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, String.valueOf(id));}/** * 獲得 指定視頻檔案F在MediaStore中對應的ID * @param f  視頻檔案 * @return  對應ID */private int getId(File f){int id = -1;// MediaStore.Video.Media.DATA：視頻檔案路徑；// MediaStore.Video.Media.DISPLAY_NAME : 視頻檔案名稱，如 testVideo.mp4// MediaStore.Video.Media.TITLE: 視頻標題 : testVideoString[] mediaColumns = { MediaStore.Video.Media._ID,MediaStore.Video.Media.DATA, MediaStore.Video.Media.TITLE,MediaStore.Video.Media.MIME_TYPE,MediaStore.Video.Media.DISPLAY_NAME };final String where = MediaStore.Video.Media.DATA + "="+"?"; Cursorcursor = managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,mediaColumns, where, new String[]{f.getAbsolutePath()}, null);if(cursor==null){Toast.makeText(this, "沒有找到可播放視頻檔案", 1).show();return -1;}if (cursor.moveToFirst()) {do {id = cursor.getInt(cursor.getColumnIndex(MediaStore.Video.Media._ID));//sysVideoList.add(info);} while (cursor.moveToNext());}return id;}