实验 利用百度地图对自己定位

一   实验现象（虽然定位到了，但是不准确）

二 实验部分代码

mainactivty

package com.example.baidumap;import java.util.List;import com.baidu.mapapi.BMapManager;import com.baidu.mapapi.map.LocationData;import com.baidu.mapapi.map.MapController;import com.baidu.mapapi.map.MapView;import com.baidu.mapapi.map.MyLocationOverlay;import com.baidu.platform.comapi.basestruct.GeoPoint;import com.example.baidumap.R;import android.location.Location;import android.location.LocationManager;import android.os.Bundle;import android.app.Activity;import android.content.Context;import android.view.Menu;import android.widget.Toast;public class MainActivity extends Activity {private BMapManager manager;private MapView mapView;private LocationManager locationManager;private String provider;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);manager = new BMapManager(this);manager.init("Vyi9TssaKUZRZsNSjX6LloYrpIPfDlHA", null);setContentView(R.layout.activity_main);mapView = (MapView) findViewById(R.id.map_view);mapView.setBuiltInZoomControls(true);locationManager = (LocationManager) getSystemService(Context. LOCATION_SERVICE);// 获取所有可用的位置提供器List<String> providerList = locationManager.getProviders(true);if (providerList.contains(LocationManager.GPS_PROVIDER)) {provider = LocationManager.GPS_PROVIDER;} else if (providerList.contains(LocationManager.NETWORK_PROVIDER)) {provider = LocationManager.NETWORK_PROVIDER;} else {// 当没有可用的位置提供器时，弹出Toast提示用户Toast.makeText(this, "No location provider to use", Toast.LENGTH_SHORT).show();return;}Location location = locationManager.getLastKnownLocation(provider);if (location != null) {navigateTo(location);}}private void navigateTo(Location location) {// TODO Auto-generated method stubMapController controller = mapView.getController();controller.setZoom(16); // 设置缩放级别GeoPoint point = new GeoPoint((int) (location.getLatitude() * 1E6),(int) (location.getLongitude() * 1E6));controller.setCenter(point); // 设置地图中心点MyLocationOverlay myLocationOverlay = new MyLocationOverlay(mapView);LocationData locationData = new LocationData();// 指定我的位置locationData.latitude = location.getLatitude();locationData.longitude = location.getLongitude();myLocationOverlay.setData(locationData);mapView.getOverlays().add(myLocationOverlay);mapView.refresh(); // 刷新使新增覆盖物生效}@Overrideprotected void onResume() {mapView.onResume();if (manager != null) {manager.start();}super.onResume();}@Overrideprotected void onPause() {mapView.onPause();if (manager != null) {manager.stop();}super.onPause();}@Overrideprotected void onDestroy() {mapView.destroy();if (manager != null) {manager.destroy();manager = null;}super.onDestroy();}}

格局

<com.baidu.mapapi.map.MapView        android:id="@+id/map_view"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:clickable="true" />

三 实验后体会

   本次实验首先需要在百度开发中心申请KEY，还要下载jar包，还要对此增加权限。