If you want to create a QPixamp object with transparent background you simply need to fill the entire area with transparent color immediately after created. After doing this you can start to draw over.

QPixmap MyPixmap(QSize(32,32));


// Now you can draw into
// .......

If you want to know how to draw into a QPixmap check this post.
Draw inside QPixmap can be made using QPainter object. Basically you have to pass to QPainter the pointer to your QPixmap (already created with fixed size) and you can draw inside as the same of window area painting.

QPixmap MyPixamp(QSize(32,32));
QPainter Painter;

// Here paint inside QPixmap
Painter.setPen(QPen(QBrush(Qt::red), 1, Qt::DashLine));
// ...
Eclipse is the "official" IDE proposed by Google for Android development. Usually Android app are written using Java code but for some specific task could be necessary to use native C/C++ code to interface with the Java side. Here a tutorial about how to configure Eclipse for a mixed Java and C/C++ code and how to develop it.

Java language used in Android allow to communicate to external libraries written in C language through JNI interface. However is possible to use only dynamics libraries and there is no possibility, for obvious reasons, to use static libraries instead. In case you have a precompiled static library you need to use in your Android app you can create a dynamics as "wrapper" for your static library.

If you want to use Google Maps in your web site or application and want to have, by default, show the whole world this is the basic page to use.