二、程序功能
首先要引入地图的库:

并且要定义两个地图控制对象:
private MapView mapView;
private MapController mc;
在按钮响应中添加:
mapView = (MapView) findViewById(R.id.myMap);
mapView.setTraffic(true);
mc = mapView.getController();
GeoPoint gp = new GeoPoint((int) (Double.parseDouble(latText.getText().toString()) * 1000000), (int) (Double.parseDouble(lngText.getText().toString()) * 1000000));
mapView.setTraffic(true);
mc = mapView.getController();
GeoPoint gp = new GeoPoint((int) (Double.parseDouble(latText.getText().toString()) * 1000000), (int) (Double.parseDouble(lngText.getText().toString()) * 1000000));
此处从文本框中获取经纬度坐标,转换成其标准格式。
mc.animateTo(gp);
mc.setZoom(Integer.parseInt(zm.getText().toString()));
设置放大倍数。