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Editorial Team
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Asked: 2026-05-14T07:17:12+00:00

I am working on an app which calls a rest web service. Sometimes the

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I am working on an app which calls a rest web service. Sometimes the xml responses contain characters which the phone can not display. When displaying these characters, an empty box is displayed instead. I would like to filter out these characters. How can I detect if a character will be able to be displayed on the screen?

Some specific characters include:

http://www.fileformat.info/info/unicode/char/0094/index.htm
http://www.fileformat.info/info/unicode/char/0080/index.htm
http://www.fileformat.info/info/unicode/char/0092/index.htm

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1 Answer

  1. Editorial Team

    Android support the following encodings

    • Xml.Encoding ISO_8859_1
    • Xml.Encoding US_ASCII
    • Xml.Encoding UTF_16
    • Xml.Encoding UTF_8

    US_ASCII shouldn’t make any problems.

    For ISO_8859_1 you should check wiki
    for control chars 0x00-0x1f and 0x7f-0x9f and filter them.
    And of course use a matching font.

    Using UTF_8 or 16 is more complex, read Joels The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets

    You might find this mailing list useful.

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