Android Uri和文件路径互相转换的实例代码

概述在项目中需要用到将Uri转换为绝对路径，在网上找到一个方法，做个笔记网上有不少方法，但是有的对4.4后的版本无效，这里的方法可以在4.4之后的版本将Uri转换为绝对路径

在项目中需要用到将Uri转换为绝对路径，在网上找到一个方法，做个笔记

网上有不少方法，但是有的对4.4后的版本无效，这里的方法可以在4.4之后的版本将Uri转换为绝对路径

public class GetPathFromUri {   /**    * 专为AndroID4.4设计的从Uri获取文件绝对路径    */   public static String getPath(final Context context,final Uri uri) {     final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;     // documentProvIDer     if (isKitKat && documentsContract.isdocumentUri(context,uri)) {       // ExternalStorageProvIDer       if (isExternalStoragedocument(uri)) {         final String docID = documentsContract.getdocumentID(uri);         final String[] split = docID.split(":");         final String type = split[0];         if ("primary".equalsIgnoreCase(type)) {           return Environment.getExternalStorageDirectory() + "/" + split[1];         }       }       // DownloadsProvIDer       else if (isDownloadsdocument(uri)) {         final String ID = documentsContract.getdocumentID(uri);         final Uri contentUri = ContentUris.withAppendedID(             Uri.parse("content://downloads/public_downloads"),Long.valueOf(ID));         return getDataColumn(context,contentUri,null,null);       }       // MediaProvIDer       else if (isMediadocument(uri)) {         final String docID = documentsContract.getdocumentID(uri);         final String[] split = docID.split(":");         final String type = split[0];         Uri contentUri = null;         if ("image".equals(type)) {           contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;         } else if ("vIDeo".equals(type)) {           contentUri = MediaStore.VIDeo.Media.EXTERNAL_CONTENT_URI;         } else if ("audio".equals(type)) {           contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;         }         final String selection = "_ID=?";         final String[] selectionArgs = new String[]{split[1]};         return getDataColumn(context,selection,selectionArgs);       }     }     // MediaStore (and general)     else if ("content".equalsIgnoreCase(uri.getScheme())) {       return getDataColumn(context,uri,null);     }     // file     else if ("file".equalsIgnoreCase(uri.getScheme())) {       return uri.getPath();     }     return null;   }   /**    * Get the value of the data column for this Uri. This is useful for    * MediaStore Uris,and other file-based ContentProvIDers.    *    * @param context    The context.    * @param uri      The Uri to query.    * @param selection   (Optional) Filter used in the query.    * @param selectionArgs (Optional) Selection arguments used in the query.    * @return The value of the _data column,which is typically a file path.    */   public static String getDataColumn(Context context,Uri uri,String selection,String[] selectionArgs) {     Cursor cursor = null;     final String column = "_data";     final String[] projection = {column};     try {       cursor = context.getContentResolver().query(uri,projection,selectionArgs,null);       if (cursor != null && cursor.movetoFirst()) {         final int column_index = cursor.getColumnIndexOrThrow(column);         return cursor.getString(column_index);       }     } finally {       if (cursor != null)         cursor.close();     }     return null;   }   /**    * @param uri The Uri to check.    * @return Whether the Uri authority is ExternalStorageProvIDer.    */   public static boolean isExternalStoragedocument(Uri uri) {     return "com.androID.externalstorage.documents".equals(uri.getAuthority());   }   /**    * @param uri The Uri to check.    * @return Whether the Uri authority is DownloadsProvIDer.    */   public static boolean isDownloadsdocument(Uri uri) {     return "com.androID.provIDers.downloads.documents".equals(uri.getAuthority());   }   /**    * @param uri The Uri to check.    * @return Whether the Uri authority is MediaProvIDer.    */   public static boolean isMediadocument(Uri uri) {     return "com.androID.provIDers.media.documents".equals(uri.getAuthority());   } } 

绝对路径转Uri比较简单

以绝对路径创建一个file对象，然后调用

Uri.fromfile(file)

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