Android百度地图开发之在定位图层显示他人位置（代码实现）

在这篇博客中主要做了两个工作

①添加显示他人位置的marker

② 将他人头像作为图片合并到marker中进行显示

主要代码：

① 添加他人位置

这段代码可以添加到构造函数中，或者从服务器获取到他人位置后的代码中去

//添加他人位置
        resources r = this.getresources();
        bitmap bmp= bitmapfactory.decoderesource(r, r.drawable.touxiang);
        addotherslocation(double（对方的经度）,double（对方的纬度）,bmp（对方的头像bitmap）);

主要函数：

public void addotherslocation(double latitute,double longtitute, bitmap touxiang) {

        resources r = this.getresources();
        bitmap bmp= bitmapfactory.decoderesource(r, r.drawable.icon_geo);//红点

//        //构建marker图标
//        otherscurrentmarker = bitmapdescriptorfactory
//                .fromresource(r.drawable.icon_geo);

        //构建marker图标
        otherscurrentmarker = bitmapdescriptorfactory
                .frombitmap(mergebitmap(bmp,touxiang));//public static bitmapdescriptor frombitmap(bitmap image)  + mergebitmap()

        //定义maker坐标点
        latlng point = new latlng(latitute, longtitute);
        //构建markeroption，用于在地图上添加marker
        overlayoptions option = new markeroptions()
                .position(point)
                .icon(otherscurrentmarker);
        //在地图上添加marker，并显示
        mbaidumap.addoverlay(option);
    }

②合并标志点图片和用户头像图像

//将两张图片合并为一张图片 用作头像
    private bitmap mergebitmap(bitmap firstbitmap, bitmap secondbitmap) {
        int width = firstbitmap.getwidth();
        int height = firstbitmap.getheight();
        secondbitmap = zoomimage(secondbitmap,width,height);
        bitmap bitmap = bitmap.createbitmap(width, height*2,
                firstbitmap.getconfig());
        canvas canvas = new canvas(bitmap);
        canvas.drawbitmap(secondbitmap, new matrix(), null);
        canvas.drawbitmap(firstbitmap, 0, height, null);
        return bitmap;
    }

    //缩放头像图片
    public  bitmap zoomimage(bitmap bgimage, double newwidth,
                             double newheight) {
        // 获取这个图片的宽和高
        float width = bgimage.getwidth();
        float height = bgimage.getheight();
        // 创建操作图片用的matrix对象
        matrix matrix = new matrix();
        // 计算宽高缩放率
        float scalewidth = ((float) newwidth) / width;
        float scaleheight = ((float) newheight) / height;
        // 缩放图片动作
        matrix.postscale(scalewidth, scaleheight);
        bitmap bitmap = bitmap.createbitmap(bgimage, 0, 0, (int) width,
                (int) height, matrix, true);
        return bitmap;
    }

完整代码：

import android.manifest;
import android.app.activity;
import android.content.context;
import android.content.pm.packagemanager;
import android.content.res.resources;
import android.graphics.bitmap;
import android.graphics.bitmapfactory;
import android.graphics.canvas;
import android.graphics.matrix;
import android.graphics.drawable.bitmapdrawable;
import android.graphics.drawable.drawable;
import android.hardware.sensor;
import android.hardware.sensorevent;
import android.hardware.sensoreventlistener;
import android.hardware.sensormanager;
import android.os.build;
import android.os.bundle;
import android.support.v4.app.activitycompat;
import android.support.v4.content.contextcompat;
import android.util.log;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.button;
import android.widget.compoundbutton;
import android.widget.imageview;
import android.widget.radiogroup.oncheckedchangelistener;
import android.widget.toast;
import android.widget.togglebutton;
import android.widget.zoomcontrols;

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.bitmapdescriptor;
import com.baidu.mapapi.map.bitmapdescriptorfactory;
import com.baidu.mapapi.map.mapstatusupdate;
import com.baidu.mapapi.map.mapstatusupdatefactory;
import com.baidu.mapapi.map.mapview;
import com.baidu.mapapi.map.markeroptions;
import com.baidu.mapapi.map.mylocationconfiguration;
import com.baidu.mapapi.map.mylocationconfiguration.locationmode;
import com.baidu.mapapi.map.mylocationdata;
import com.baidu.mapapi.map.overlayoptions;
import com.baidu.mapapi.model.latlng;

/**
 * 此demo用来展示如何结合定位sdk实现定位，并使用mylocationoverlay绘制定位位置 同时展示如何使用自定义图标绘制并点击时弹出泡泡 
 *
 */
public class locationdemo extends activity {

    // 定位相关  
    locationclient mlocclient;
    public mylocationlistenner mylistener = new mylocationlistenner();
    private locationmode mcurrentmode;
    bitmapdescriptor mcurrentmarker,otherscurrentmarker;

    mapview mmapview;
    baidumap mbaidumap;

    private sensormanager msensormanager;
    double degree = 0;
    // ui相关  
    oncheckedchangelistener radiobuttonlistener;
    button requestlocbutton;
    togglebutton togglebtn = null;
    boolean isfirstloc = true;// 是否首次定位  

    @override
    public void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        sdkinitializer.initialize(getapplicationcontext());
        setcontentview(r.layout.activity_location);
        judgepermission();
        requestlocbutton = (button) findviewbyid(r.id.button1);
        mcurrentmode = locationmode.normal;
        requestlocbutton.settext("普通");
        onclicklistener btnclicklistener = new onclicklistener() {
            public void onclick(view v) {
                switch (mcurrentmode) {
                    case normal:
                        requestlocbutton.settext("跟随");
                        mcurrentmode = locationmode.following;
                        mbaidumap
                                .setmylocationconfigeration(new mylocationconfiguration(
                                        mcurrentmode, true, mcurrentmarker));
                        break;
                    case compass:
                        requestlocbutton.settext("普通");
                        mcurrentmode = locationmode.normal;
                        mbaidumap
                                .setmylocationconfigeration(new mylocationconfiguration(
                                        mcurrentmode, true, mcurrentmarker));
                        break;
                    case following:
                        requestlocbutton.settext("罗盘");
                        mcurrentmode = locationmode.compass;
                        mbaidumap
                                .setmylocationconfigeration(new mylocationconfiguration(
                                        mcurrentmode, true, mcurrentmarker));
                        break;
                }
            }
        };
        requestlocbutton.setonclicklistener(btnclicklistener);

        togglebtn = (togglebutton) findviewbyid(r.id.togglebutton);
        togglebtn
                .setoncheckedchangelistener(new android.widget.compoundbutton.oncheckedchangelistener() {

                    @override
                    public void oncheckedchanged(compoundbutton buttonview,
                                                 boolean ischecked) {
                        if (ischecked) {
                            // 普通地图  
                            mbaidumap.setmaptype(baidumap.map_type_satellite);
                        } else {
                            // 卫星地图  
                            mbaidumap.setmaptype(baidumap.map_type_normal);
                        }

                    }
                });

        // 地图初始化  
        mmapview = (mapview) findviewbyid(r.id.bmapview);
        mbaidumap = mmapview.getmap();
        // 开启定位图层  
        mbaidumap.setmylocationenabled(true);
        // 定位初始化  
        mlocclient = new locationclient(this);
        mlocclient.registerlocationlistener(mylistener);
        locationclientoption option = new locationclientoption();
        option.setopengps(true);// 打开gps  
        option.setcoortype("bd09ll"); // 设置坐标类型  
        option.setscanspan(1000);// 设置发起定位请求的间隔时间为1000ms  
        option.setisneedaddress(true);
        mlocclient.setlocoption(option);
        mlocclient.start();
        // 隐藏logo
        view child = mmapview.getchildat(1);
        if (child != null && (child instanceof imageview || child instanceof zoomcontrols)){
            child.setvisibility(view.invisible);
        }

        //指南针
        msensormanager= (sensormanager) getsystemservice(context.sensor_service);
        sensor magenticsensor=msensormanager.getdefaultsensor(sensor.type_magnetic_field);
        sensor accelerometersensor=msensormanager.getdefaultsensor(sensor.type_accelerometer);
        msensormanager.registerlistener(listener,magenticsensor,sensormanager.sensor_delay_game);
        msensormanager.registerlistener(listener,accelerometersensor,sensormanager.sensor_delay_game);

        //添加他人位置
        resources r = this.getresources();
        bitmap bmp= bitmapfactory.decoderesource(r, r.drawable.touxiang);
        addotherslocation(经度（double),纬度（double),头像bmp);
    }

    //指南针 获取degree值
    private sensoreventlistener listener=new sensoreventlistener() {
        float[] accelerometervalues=new float[3];
        float[] magenticvalues=new float[3];
        @override
        public void onsensorchanged(sensorevent sensorevent) {
            //判断当前是加速度传感器还是地磁传感器
            if(sensorevent.sensor.gettype()==sensor.type_accelerometer){
                accelerometervalues=sensorevent.values.clone();
            }else if(sensorevent.sensor.gettype()== sensor.type_magnetic_field){
                magenticvalues=sensorevent.values.clone();
            }
            float[] r=new float[9];
            float[] values=new float[3];
            sensormanager.getrotationmatrix(r, null, accelerometervalues, magenticvalues);
            sensormanager.getorientation(r,values);
            log.d("mainactivity","value[0] is"+math.todegrees(values[0]));
            degree = math.todegrees(values[0]);

        }
        @override
        public void onaccuracychanged(sensor sensor, int i) {
        }
    };

    public void addotherslocation(double latitute,double longtitute, bitmap touxiang) {

        resources r = this.getresources();
        bitmap bmp= bitmapfactory.decoderesource(r, r.drawable.icon_geo);//标识红点

//        //构建marker图标
//        otherscurrentmarker = bitmapdescriptorfactory
//                .fromresource(r.drawable.icon_geo);

        //构建marker图标
        otherscurrentmarker = bitmapdescriptorfactory
                .frombitmap(mergebitmap(bmp,touxiang));//public static bitmapdescriptor frombitmap(bitmap image)  + mergebitmap()

        //定义maker坐标点
        latlng point = new latlng(latitute, longtitute);
        //构建markeroption，用于在地图上添加marker
        overlayoptions option = new markeroptions()
                .position(point)
                .icon(otherscurrentmarker);
        //在地图上添加marker，并显示
        mbaidumap.addoverlay(option);
    }

    //将两张图片合并为一张图片 用作头像
    private bitmap mergebitmap(bitmap firstbitmap, bitmap secondbitmap) {
        int width = firstbitmap.getwidth();
        int height = firstbitmap.getheight();
        secondbitmap = zoomimage(secondbitmap,width,height);
        bitmap bitmap = bitmap.createbitmap(width, height*2,
                firstbitmap.getconfig());
        canvas canvas = new canvas(bitmap);
        canvas.drawbitmap(secondbitmap, new matrix(), null);
        canvas.drawbitmap(firstbitmap, 0, height, null);
        return bitmap;
    }

    //缩放头像图片
    public  bitmap zoomimage(bitmap bgimage, double newwidth,
                             double newheight) {
        // 获取这个图片的宽和高
        float width = bgimage.getwidth();
        float height = bgimage.getheight();
        // 创建操作图片用的matrix对象
        matrix matrix = new matrix();
        // 计算宽高缩放率
        float scalewidth = ((float) newwidth) / width;
        float scaleheight = ((float) newheight) / height;
        // 缩放图片动作
        matrix.postscale(scalewidth, scaleheight);
        bitmap bitmap = bitmap.createbitmap(bgimage, 0, 0, (int) width,
                (int) height, matrix, true);
        return bitmap;
    }

    /**
     * 定位sdk监听函数 
     */
    public class mylocationlistenner implements bdlocationlistener {

        @override
        public void onreceivelocation(bdlocation location) {
            // map view 销毁后不在处理新接收的位置  
            if (location == null || mmapview == null)
                return;
            mylocationdata locdata = new mylocationdata.builder()
                    .accuracy(location.getradius())
                    // 此处设置开发者获取到的方向信息，顺时针0-360  
                    .direction((float)degree).latitude(location.getlatitude())
                    .longitude(location.getlongitude()).build();
            mbaidumap.setmylocationdata(locdata);
            if (isfirstloc) {
                isfirstloc = false;
                //定义maker坐标点  https://blog.csdn.net/u012382791/article/details/53856203
                latlng ll = new latlng(location.getlatitude(),
                        location.getlongitude());
                // mapstatusupdate u = mapstatusupdatefactory.newlatlng(ll);  
                // 设置缩放比例,更新地图状态  
                float f = mbaidumap.getmaxzoomlevel();// 19.0
                mapstatusupdate u = mapstatusupdatefactory.newlatlngzoom(ll,
                        f - 2);
                mbaidumap.animatemapstatus(u);
                //地图位置显示  
                toast.maketext(locationdemo.this, location.getaddrstr(),
                        toast.length_short).show();
            }

        }

        public void onreceivepoi(bdlocation poilocation) {
        }
    }

    @override
    protected void onpause() {
        mmapview.onpause();
        super.onpause();
    }

    @override
    protected void onresume() {
        mmapview.onresume();
        super.onresume();
    }

    @override
    protected void ondestroy() {
        // 退出时销毁定位  
        mlocclient.stop();
        // 关闭定位图层  
        mbaidumap.setmylocationenabled(false);
        mmapview.ondestroy();
        mmapview = null;

        if(msensormanager!=null){
            msensormanager.unregisterlistener(listener);
        }
        super.ondestroy();
    }


    //6.0之后要动态获取权限，重要！！！
    protected void judgepermission() {

        if (build.version.sdk_int >= build.version_codes.m) {
            // 检查该权限是否已经获取
            // 权限是否已经 授权 granted---授权  dinied---拒绝

            // sd卡权限
            string[] sdcardpermission = {manifest.permission.write_external_storage};
            if (contextcompat.checkselfpermission(this, sdcardpermission[0]) != packagemanager.permission_granted) {
                // 如果没有授予该权限，就去提示用户请求
                activitycompat.requestpermissions(this, sdcardpermission, 100);
            }

            //手机状态权限
            string[] readphonestatepermission = {manifest.permission.read_phone_state};
            if (contextcompat.checkselfpermission(this, readphonestatepermission[0]) != packagemanager.permission_granted) {
                // 如果没有授予该权限，就去提示用户请求
                activitycompat.requestpermissions(this, readphonestatepermission, 200);
            }

            //定位权限
            string[] locationpermission = {manifest.permission.access_fine_location};
            if (contextcompat.checkselfpermission(this, locationpermission[0]) != packagemanager.permission_granted) {
                // 如果没有授予该权限，就去提示用户请求
                activitycompat.requestpermissions(this, locationpermission, 300);
            }

            string[] access_coarse_location = {manifest.permission.access_coarse_location};
            if (contextcompat.checkselfpermission(this, access_coarse_location[0]) != packagemanager.permission_granted) {
                // 如果没有授予该权限，就去提示用户请求
                activitycompat.requestpermissions(this, access_coarse_location, 400);
            }


            string[] read_external_storage = {manifest.permission.read_external_storage};
            if (contextcompat.checkselfpermission(this, read_external_storage[0]) != packagemanager.permission_granted) {
                // 如果没有授予该权限，就去提示用户请求
                activitycompat.requestpermissions(this, read_external_storage, 500);
            }

            string[] write_external_storage = {manifest.permission.write_external_storage};
            if (contextcompat.checkselfpermission(this, write_external_storage[0]) != packagemanager.permission_granted) {
                // 如果没有授予该权限，就去提示用户请求
                activitycompat.requestpermissions(this, write_external_storage, 600);
            }

        }else{
            //dosdcardresult();
        }
        //locationclient.restart();
    }
}  

效果截图：

左上角红点带头像的就是别人的位置显示

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