Android把文件Uri转换成Flie路径

在Android编程中经常用到这样的问题；
下面直接上代码

/**
     * 转换路径
     * 把uri转化为 File路径
     * @param context
     * @param uri
     * @return
     */
    public static String getRealFilePath(final Context context, final Uri uri ) {
        if ( null == uri ) return null;
        final String scheme = uri.getScheme();
        String data = null;
        if ( scheme == null )
            data = uri.getPath();
        else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) {
            data = uri.getPath();
        } else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) {
            Cursor cursor = context.getContentResolver().query( uri, new String[] { MediaStore.Images.ImageColumns.DATA }, null, null, null );
            if ( null != cursor ) {
                if ( cursor.moveToFirst() ) {
                    int index = cursor.getColumnIndex( MediaStore.Images.ImageColumns.DATA );
                    if ( index > -1 ) {
                        data = cursor.getString( index );
                    }
                }
                cursor.close();
            }
        }
        return data;
    }

那么假如我们有一个图片的路径地址又该如何获得其Uri呢？

 String type = Utils.ensureNotNull(intent.getType());
                Log.d(TAG, "uri is " + uri);
                if (uri.getScheme().equals("file") && (type.contains("image/"))) {
                    String path = uri.getEncodedPath();
                    Log.d(TAG, "path1 is " + path);
                    if (path != null) {
                        path = Uri.decode(path);
                        Log.d(TAG, "path2 is " + path);
                        ContentResolver cr = this.getContentResolver();
                        StringBuffer buff = new StringBuffer();
                        buff.append("(")
                                .append(Images.ImageColumns.DATA)
                                .append("=")
                                .append("'" + path + "'")
                                .append(")");
                        Cursor cur = cr.query(
                                Images.Media.EXTERNAL_CONTENT_URI,
                                new String[] { Images.ImageColumns._ID },
                                buff.toString(), null, null);
                        int index = 0;
                        for (cur.moveToFirst(); !cur.isAfterLast(); cur
                                .moveToNext()) {
                            index = cur.getColumnIndex(Images.ImageColumns._ID);
                            // set _id value
                            index = cur.getInt(index);
                        }
                        if (index == 0) {
                            //do nothing
                        } else {
                            Uri uri_temp = Uri
                                    .parse("content://media/external/images/media/"
                                            + index);
                            Log.d(TAG, "uri_temp is " + uri_temp);
                            if (uri_temp != null) {
                                uri = uri_temp;
                            }
                        }
                    }
                }