在上一篇博客中,我们成功把地图导入了我们的项目。本篇我们准备为地图添加:第一,定位功能;第二,与方向传感器结合,通过旋转手机进行道路的方向确认。有了这两个功能,地图已经可以为我服务了~~~~
效果图:
好了,可以代码,为了方便,我把所有的按钮都放到了menu菜单中。
1、初次启动定位
- private LocationClient mLocationClient;
-
- public MyLocationListener mMyLocationListener;
-
- private LocationMode mCurrentMode = LocationMode.NORMAL;
-
- private volatile boolean isFristLocation = true;
-
- private void initMyLocation()
- {
-
- mLocationClient = new LocationClient(this);
- mMyLocationListener = new MyLocationListener();
- mLocationClient.registerLocationListener(mMyLocationListener);
-
- LocationClientOption option = new LocationClientOption();
- option.setOpenGps(true);
- option.setCoorType("bd09ll");
- option.setScanSpan(1000);
- mLocationClient.setLocOption(option);
- }
然后是定位的监听器MyLocationListener:
- public class MyLocationListener implements BDLocationListener
- {
- @Override
- public void onReceiveLocation(BDLocation location)
- {
-
-
- if (location == null || mMapView == null)
- return;
-
- MyLocationData locData = new MyLocationData.Builder()
- .accuracy(location.getRadius())
-
- .direction(mXDirection).latitude(location.getLatitude())
- .longitude(location.getLongitude()).build();
- mCurrentAccracy = location.getRadius();
-
- mBaiduMap.setMyLocationData(locData);
- mCurrentLantitude = location.getLatitude();
- mCurrentLongitude = location.getLongitude();
-
- BitmapDescriptor mCurrentMarker = BitmapDescriptorFactory
- .fromResource(R.drawable.navi_map_gps_locked);
- MyLocationConfigeration config = new MyLocationConfigeration(
- mCurrentMode, true, mCurrentMarker);
- mBaiduMap.setMyLocationConfigeration(config);
-
- if (isFristLocation)
- {
- isFristLocation = false;
- LatLng ll = new LatLng(location.getLatitude(),
- location.getLongitude());
- MapStatusUpdate u = MapStatusUpdateFactory.newLatLng(ll);
- mBaiduMap.animateMapStatus(u);
- }
- }
-
- }
可以看到,我们初始化了定位的参数,设置了定位的监听器,每隔1s会进行一次定位,应用打开时,第一定位,会把地图中心设置当前用户位置。
定位也是比较耗电的,所以我们在onStart中开启定位,在onStop中关闭定位~~这样应用最小化时就不会一直在哪GPS请求定位了,用户要是看你app一直在那定位,估计马上就被卸载了~
- @Override
- protected void onStart()
- {
-
- mBaiduMap.setMyLocationEnabled(true);
- if (!mLocationClient.isStarted())
- {
- mLocationClient.start();
- }
-
- myOrientationListener.start();
- super.onStart();
- }
-
- @Override
- protected void onStop()
- {
-
- mBaiduMap.setMyLocationEnabled(false);
- mLocationClient.stop();
-
-
- myOrientationListener.stop();
- super.onStop();
- }
上面的传感器的代码,一会就会介绍~
记得在AndroidManifest.xml配一个service
- <service
- android:name="com.baidu.location.f"
- android:enabled="true"
- android:process=":remote" >
- <intent-filter>
- <action android:name="com.baidu.location.service_v2.2" >
- </action>
- </intent-filter>
- </service>
现在基本的定位功能已经实现了~不过我们还需要添加点击定位按钮和方向传感器
2、我的位置
点击我的位置菜单会调用center2myLoc方法。
- case R.id.id_menu_map_myLoc:
- center2myLoc();
- break;
- private void center2myLoc()
- {
- LatLng ll = new LatLng(mCurrentLantitude, mCurrentLongitude);
- MapStatusUpdate u = MapStatusUpdateFactory.newLatLng(ll);
- mBaiduMap.animateMapStatus(u);
- }
很简单,我们在定位的监听器中已经保存了最近一次的定位经纬度,所以只需要点击时,把地图移动到相应的位置即可。
3、集成方向传感器
首先是封装的方向传感器的类MyOrientationListener.java
- package com.zhy.zhy_baidu_ditu_demo00;
-
- import android.content.Context;
- import android.hardware.Sensor;
- import android.hardware.SensorEvent;
- import android.hardware.SensorEventListener;
- import android.hardware.SensorManager;
-
- public class MyOrientationListener implements SensorEventListener
- {
-
- private Context context;
- private SensorManager sensorManager;
- private Sensor sensor;
-
- private float lastX ;
-
- private OnOrientationListener onOrientationListener ;
-
- public MyOrientationListener(Context context)
- {
- this.context = context;
- }
-
-
- public void start()
- {
-
- sensorManager = (SensorManager) context
- .getSystemService(Context.SENSOR_SERVICE);
- if (sensorManager != null)
- {
-
- sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
- }
-
- if (sensor != null)
- {
- sensorManager.registerListener(this, sensor,
- SensorManager.SENSOR_DELAY_UI);
- }
-
- }
-
-
- public void stop()
- {
- sensorManager.unregisterListener(this);
- }
-
- @Override
- public void onAccuracyChanged(Sensor sensor, int accuracy)
- {
-
- }
-
- @Override
- public void onSensorChanged(SensorEvent event)
- {
-
- if (event.sensor.getType() == Sensor.TYPE_ORIENTATION)
- {
-
- float x = event.values[SensorManager.DATA_X];
-
- if( Math.abs(x- lastX) > 1.0 )
- {
- onOrientationListener.onOrientationChanged(x);
- }
- lastX = x ;
-
- }
- }
-
- public void setOnOrientationListener(OnOrientationListener onOrientationListener)
- {
- this.onOrientationListener = onOrientationListener ;
- }
-
-
- public interface OnOrientationListener
- {
- void onOrientationChanged(float x);
- }
-
- }
在onCreate中初始化方向传感器
- private void initOritationListener()
- {
- myOrientationListener = new MyOrientationListener(
- getApplicationContext());
- myOrientationListener
- .setOnOrientationListener(new OnOrientationListener()
- {
- @Override
- public void onOrientationChanged(float x)
- {
- mXDirection = (int) x;
-
-
- MyLocationData locData = new MyLocationData.Builder()
- .accuracy(mCurrentAccracy)
-
- .direction(mXDirection)
- .latitude(mCurrentLantitude)
- .longitude(mCurrentLongitude).build();
-
- mBaiduMap.setMyLocationData(locData);
-
- BitmapDescriptor mCurrentMarker = BitmapDescriptorFactory
- .fromResource(R.drawable.navi_map_gps_locked);
- MyLocationConfigeration config = new MyLocationConfigeration(
- mCurrentMode, true, mCurrentMarker);
- mBaiduMap.setMyLocationConfigeration(config);
-
- }
- });
- }
最后在onStart和onStop中分别开启和关闭方向传感器。
对于旋转手机确定方向,实际上利用了
- new MyLocationData.Builder()
只需要把x方向的角度设置即可~~~是不是很简单~~~
好了,介绍完毕了,关闭地图样式的切换,以及跟随、罗盘等模式的切换就不介绍了,大家自己看下源码~~
转载请标明出处:http://blog.csdn.net/lmj623565791/article/details/37730469
Android 百度地图 SDK v3.0.0 (二) 定位与结合方向传感器,布布扣,bubuko.com
Android 百度地图 SDK v3.0.0 (二) 定位与结合方向传感器
原文:http://www.cnblogs.com/yc3120/p/3903240.html