android下百度地图的api如何得到速度

很有可能你定位得到location,不是GPS产生的，而是网络定位产生的。因为前者有可能要1分钟多才能定位，而后者一般在1秒钟内就能定位。而后者，是没有速度的。
如需判断你的location是否是从GPS得到的，用location.getLocType() == BDLocation.TypeGpsLocation来判断。
请参考百度定位的示例代码：
public class MyLocationListener implements BDLocationListener {

@Override
public void onReceiveLocation(BDLocation location) {
//Receive Location
StringBuffer sb = new StringBuffer(256);
sb.append("time : ");
sb.append(location.getTime());
sb.append("\nerror code : ");
sb.append(location.getLocType());
sb.append("\nlatitude : ");
sb.append(location.getLatitude());
sb.append("\nlontitude : ");
sb.append(location.getLongitude());
sb.append("\nradius : ");
sb.append(location.getRadius());
if (location.getLocType() == BDLocation.TypeGpsLocation){
sb.append("\nspeed : ");
sb.append(location.getSpeed());
sb.append("\nsatellite : ");
sb.append(location.getSatelliteNumber());
sb.append("\ndirection : ");
sb.append("\naddr : ");
sb.append(location.getAddrStr());
sb.append(location.getDirection());
} else if (location.getLocType() == BDLocation.TypeNetWorkLocation){
sb.append("\naddr : ");
sb.append(location.getAddrStr());
//运营商信息
sb.append("\noperationers : ");
sb.append(location.getOperators());
}
logMsg(sb.toString());
Log.i("BaiduLocationApiDem", sb.toString());
}

}

没问题，就这样