使用MapView时，截取当前地图，获取Bitmap，方法如下：
/**
* mapView 截图
* @param v
* @return
*/
private Bitmap getViewBitmap(MapView v) {
v.clearFocus();
v.setPressed(false);
// 能画缓存就返回false
boolean willNotCache = v.willNotCacheDrawing();
v.setWillNotCacheDrawing(false);
int color = v.getDrawingCacheBackgroundColor();
v.setDrawingCacheBackgroundColor(0);
if (color != 0) {
v.destroyDrawingCache();
}
v.buildDrawingCache();
Bitmap cacheBitmap = null;
while (cacheBitmap == null) {
cacheBitmap = v.getDrawingMapCache(0, 0, v.getWidth(),
v.getHeight());
}
Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);
// Restore the view
v.destroyDrawingCache();
v.setWillNotCacheDrawing(willNotCache);
v.setDrawingCacheBackgroundColor(color);
return bitmap;
}
