Unicode problem with Android

I am using Unicode at the place of ASCII in Soft keyboard application, bt i found some code开发者_运维问答 like :

↑ - ↑ (up arrow) ↓ - ↓ (down arrow) ← - ← (left arrow) → - → (right arrow) ↵ - ↵ (down-left arrow) ↨ - ↨ (up-down arrow with bottom line) ...and may be more

have problem,showing Rectangular/space. Any one have list of Supported Unicode Char list for Android.

Thank in Advance

Android supports all Unicode characters, but Android does not have the fonts needed to display proper glyphs for many of those characters

To display any characters properly your application needs to use a font that contains glyphs for those particular characters. If you try to display a character that has no glyph in the font being used, you will simply get the default box displayed.