首先需要显示地图，请看我的另一篇文章
Android 使用百度地图API来显示地图
然后实时获取定位信息中的经度和纬度，
Android 获取LocationProvider以及获取定位信息
然后启动定位功能标记我的位置
- 开启定位图层 setMyLocationEnabled(true)
- 构造定位数据 MyLocationData对象
- 设置定位数据，并配置定位图层的信息
- 关闭定位图层 setMyLocationEnabled(false)
Activity中的代码如下：
private MapView mMapView;
public final static String TAG = "Location";
private BaiduMap mBaiduMap; //定义百度地图对象
//记录是否第一次定位,然后在locationUpdates()方法中设置逻辑
private boolean isFirstLoc = true;
//当前定位模式
private MyLocationConfiguration.LocationMode locationMode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//初始化地图SDK,
//需要在setContentView(R.layout.activity_main);上面
SDKInitializer.initialize(getApplicationContext());
setContentView(R.layout.activity_main);
initMap(); //初始化地图
locationProvice();//位置服务
}
private void initMap() {
//获取地图控件引用
mMapView = findViewById(R.id.bmapView);
mBaiduMap = mMapView.getMap(); //获取百度地图对象
}
/**
* 初始化位置服务,获取当前所在位置
*/
private void locationProvice() {
//获取位置服务
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
//获取最佳的LocationProvider
//创建一个过滤条件对象
//需要加入权限 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
Criteria criteria = new Criteria();
//设置为不收费的
criteria.setCostAllowed(false);
//使用精度最准确的
criteria.setAccuracy(Criteria.ACCURACY_FINE);
//设置中等耗电量
criteria.setPowerRequirement(Criteria.POWER_MEDIUM);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, //指定位置提供者
1000, //间隔时间
1, //位置间隔1米
new LocationListener() {//监听GPS定位信息是否改变
@Override
public void onLocationChanged(Location location) {
//GPS信息发生改变时,回调
locationUpdates(location);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
//GPS状态发生改变时,回调
}
@Override
public void onProviderEnabled(String provider) {
//定位提供者启动时回调
}
@Override
public void onProviderDisabled(String provider) {
//定位提供者关闭时回调
}
}
);
//获取最新的定位信息
Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
//将最新的定位信息传递给locationUpdates()方法
locationUpdates(location);
}
public void locationUpdates(Location location) {
if (location != null) {
LatLng ll = new LatLng(location.getLatitude(), location.getLongitude());
//创建一个字符串构建器,用于记录位置信息
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("您的位置是: \n");
stringBuilder.append("经度: ");
stringBuilder.append(location.getLongitude());
stringBuilder.append("\n 纬度:");
stringBuilder.append(location.getLatitude());
Log.i(TAG, stringBuilder.toString());
if (isFirstLoc) {
//更新坐标位置
MapStatusUpdate update = MapStatusUpdateFactory.newLatLng(ll);
//设置地图位置
mBaiduMap.animateMapStatus(update);
isFirstLoc=false;
}
//构造定位数据
MyLocationData locationData = new MyLocationData.Builder()
.accuracy(location.getAccuracy()) //设置精度
.direction(0) //设置方向信息
.latitude(location.getLatitude()) //设置纬度坐标
.longitude(location.getLongitude()) //设置纬度坐标
.build();
mBaiduMap.setMyLocationData(locationData);
//设置自定义图标
BitmapDescriptor bitmapDescriptor = BitmapDescriptorFactory.fromResource(R.drawable.icon_geo);
//设置定位模式
locationMode = MyLocationConfiguration.LocationMode.NORMAL;
//设置构造方式
MyLocationConfiguration configuration = new MyLocationConfiguration(
locationMode,true,bitmapDescriptor
);
//显示定位图标
mBaiduMap.setMyLocationConfiguration(configuration);
//然后再onStart()方法和onStop中添加
//开启定位图层
//mBaiduMap.setMyLocationEnabled(true);
//停止定位图层
// mBaiduMap.setMyLocationEnabled(false);
} else {
Log.i(TAG ,"没有获取到位置信息");
}
}
@Override
protected void onStart() {
super.onStart();
//开启定位图层
mBaiduMap.setMyLocationEnabled(true);
}
@Override
protected void onStop() {
super.onStop();
mBaiduMap.setMyLocationEnabled(false);
}
@Override
protected void onResume() {
super.onResume();
mMapView.onResume();
}
@Override
protected void onPause() {
super.onPause();
mMapView.onPause();
}
@Override
protected void onDestroy() {
super.onDestroy();
mMapView.onDestroy();
mMapView = null;
}