安卓百度地图SDK使用笔记（二）

添加定位功能

• MainActivity

package com.sjy.baidumap;

import com.baidu.location.BDLocation;
import com.baidu.location.BDLocationListener;
import com.baidu.location.LocationClient;
import com.baidu.location.LocationClientOption;
import com.baidu.mapapi.SDKInitializer;
import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.MapStatusUpdate;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.MyLocationConfiguration;
import com.baidu.mapapi.map.MyLocationConfiguration.LocationMode;
import com.baidu.mapapi.model.LatLng;
import com.baidu.mapapi.map.MyLocationData;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.widget.Toast;

public class MainActivity extends Activity {
    private MapView mMapView = null;// 一个显示地图的视图（View）
    private BaiduMap mBaiduMap;
    private Context context;

    // 定位相关
    private LocationClient mLocationClient;
    private MyLocationListener mLocationListener;
    private boolean isFirstIn = true;
    private double mLatitude;// 纬度
    private double mLongtitude;// 经度

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        // 在使用SDK各组件之前初始化context信息，传入ApplicationContext
        // 注意该方法要再setContentView方法之前实现
        SDKInitializer.initialize(getApplicationContext());
        setContentView(R.layout.activity_main);
        this.context = this;
        initView();
        initLocation();
    }

    private void initLocation() {
        mLocationClient = new LocationClient(this);
        mLocationListener = new MyLocationListener();
        mLocationClient.registerLocationListener(mLocationListener);
        LocationClientOption option = new LocationClientOption();
        option.setCoorType("bd09ll");
        option.setIsNeedAddress(true);
        option.setOpenGps(true);
        option.setScanSpan(1000);

        mLocationClient.setLocOption(option);
    }

    private void initView() {
        mMapView = (MapView) findViewById(R.id.bmapView);
        mBaiduMap = mMapView.getMap();// 获取地图控制器
        MapStatusUpdate mapStatusUpdate = MapStatusUpdateFactory.zoomTo(15.0f);// 设置地图缩放级别
    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        // 开始定位
        mBaiduMap.setMyLocationEnabled(true);
        if (!mLocationClient.isStarted())
            mLocationClient.start();
    }

    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        // 停止定位
        mBaiduMap.setMyLocationEnabled(false);
        mLocationClient.stop();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 在activity执行onDestroy时执行mMapView.onDestroy()，实现地图生命周期管理
        mMapView.onDestroy();
    }

    @Override
    protected void onResume() {
        super.onResume();
        // 在activity执行onResume时执行mMapView. onResume ()，实现地图生命周期管理
        mMapView.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
        // 在activity执行onPause时执行mMapView. onPause ()，实现地图生命周期管理
        mMapView.onPause();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // TODO Auto-generated method stub
        getMenuInflater().inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {
        case R.id.id_map_commen:
            mBaiduMap.setMapType(BaiduMap.MAP_TYPE_NORMAL);
            break;
        case R.id.id_map_site:
            mBaiduMap.setMapType(BaiduMap.MAP_TYPE_SATELLITE);
            break;
        case R.id.id_map_traffic:
            if (mBaiduMap.isTrafficEnabled()) {
                mBaiduMap.setTrafficEnabled(false);
                item.setTitle("实时交通(off)");
            } else {
                mBaiduMap.setTrafficEnabled(true);
                item.setTitle("实时交通(on)");
            }
            break;
        case R.id.id_map_location:
            centerToMyLocation();

            break;

        }
        return super.onOptionsItemSelected(item);
    }

    // 定位到我的位置
    private void centerToMyLocation() {
        LatLng latLng = new LatLng(mLatitude, mLongtitude);// 地理坐标基本数据结构
        MapStatusUpdate msu // 描述地图状态将要发生的变化
                = MapStatusUpdateFactory.newLatLng(latLng);// 设置地图新中心点
        mBaiduMap.animateMapStatus(msu);// 以动画方式更新地图状态，动画耗时 300 ms
    }

    private class MyLocationListener implements BDLocationListener {

        @Override
        public void onReceiveLocation(BDLocation location) {
            MyLocationData data = new MyLocationData.Builder()// 定位数据
                    .accuracy(location.getRadius())// 设置定位数据的精度信息，单位：米
                    .latitude(location.getLatitude())// 设置定位数据的纬度
                    .longitude(location.getLongitude())// 设置定位数据的经度
                    .build();// 构建生成定位数据对象
            mBaiduMap.setMyLocationData(data);// 设置定位数据, 只有先允许定位图层后设置数据才会生效
            mLatitude = location.getLatitude();
            mLongtitude = location.getLongitude();
            // MyLocationConfiguration config = new
            // MyLocationConfiguration(LocationMode.NORMAL, ar, arg2)
            if (isFirstIn) {
                // LatLng latLng = new LatLng(location.getLatitude(),
                // location.getLongitude());
                // MapStatusUpdate msu =
                // MapStatusUpdateFactory.newLatLng(latLng);
                // mBaiduMap.animateMapStatus(msu);
                centerToMyLocation();
                isFirstIn = false;
                Toast.makeText(context, location.getAddrStr(), Toast.LENGTH_SHORT).show();
            }

        }

    }
}