android图片文件的路径地址与Uri的相互转换方法

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[] { ImageColumns.DATA }, null, null, null );    if ( null != cursor ) {      if ( cursor.moveToFirst() ) {        int index = cursor.getColumnIndex( ImageColumns.DATA );        if ( index > -1 ) {          data = cursor.getString( index );        }      }      cursor.close();    }  }  return data  }

  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;              }            }          }        }