问题描述

安卓新手有个关于uri格式的疑问

如题，在安卓学习中发现uri有两种格式：file:///和content:///有什么区别？
求大神们赐教！

解决方案

文件File path与content:// Uri的相互转换

content Uri to path

[java] view plaincopy

    /**
     * Gets the corresponding path to a file from the given content:// URI
     * @param selectedVideoUri The content:// URI to find the file path from
     * @param contentResolver The content resolver to use to perform the query.
     * @return the file path as a string
     */
    public static String getFilePathFromContentUri(Uri selectedVideoUri,
            ContentResolver contentResolver) {
        String filePath;
        String[] filePathColumn = {MediaColumns.DATA};  

        Cursor cursor = contentResolver.query(selectedVideoUri, filePathColumn, null, null, null);
//      也可用下面的方法拿到cursor
//      Cursor cursor = this.context.managedQuery(selectedVideoUri, filePathColumn, null, null, null);  

        cursor.moveToFirst();  

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        filePath = cursor.getString(columnIndex);
        cursor.close();
        return filePath;
    }

path to content Uri

[java] view plaincopy

/**
 * Gets the content:// URI  from the given corresponding path to a file
 * @param context
 * @param imageFile
 * @return content Uri
 */
public static Uri getImageContentUri(Context context, java.io.File imageFile) {
       String filePath = imageFile.getAbsolutePath();
       Cursor cursor = context.getContentResolver().query(
               MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
               new String[] { MediaStore.Images.Media._ID },
               MediaStore.Images.Media.DATA + "=? ",
               new String[] { filePath }, null);
       if (cursor != null && cursor.moveToFirst()) {
           int id = cursor.getInt(cursor
                   .getColumnIndex(MediaStore.MediaColumns._ID));
           Uri baseUri = Uri.parse("content://media/external/images/media");
           return Uri.withAppendedPath(baseUri, "" + id);
       } else {
           if (imageFile.exists()) {
               ContentValues values = new ContentValues();
               values.put(MediaStore.Images.Media.DATA, filePath);
               return context.getContentResolver().insert(
                       MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
           } else {
               return null;
           }
       }
   }  

        另外，一篇[Android数据的四种存储体式格式SharePreference、SQLite、Content Provider和File...

](http://blog.sina.com.cn/s/blog_a227c5730101avnd.html "")

均可以参考参考

解决方案二：

参考： http://blog.csdn.net/thini/article/details/9980007