Do Qt for Andriod and iOS support QPainter?
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Yes, they do.
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yes, you can use QPainter & QGraphicsView and all graphic libraries except OpenGL in android.
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Speaking for iOS:
Yes, however, the (Digia) platform plugin (shipped with Qt 5.1) supports only a GL painter. This painter lacks the quality (and some of the features) of the 'raster' painter. The Qt4iOS platform plugin supports both the GL and 'raster' painters.