Android百度定位导航之基于百度地图移动获取位置和自动定位

一、问题描述

使用百度地图实现如图所示应用，首先自动定位当前我起始位置（小圆点位置），并跟随移动不断自动定位我的当前位置

百度api不同版本使用会有些差异，本例中加入lib如下：

二、编写myapplication类

public class myapplication extends application {
static myapplication myapplication;
bmapmanager mbmapmanager = null;
string mstrkey = "7zfurcox1g3oz8tkutngm4so";
boolean m_bkeyright = true; // 授权key正确，验证通过
private list<activity> activitylist = new linkedlist<activity>();
@override
public void oncreate() {
myapplication = this;
initenginemanager(this);
super.oncreate();
}
public void initenginemanager(context context) {
if (mbmapmanager == null) {
mbmapmanager = new bmapmanager(context);
toast.maketext(myapplication.getinstance().getapplicationcontext(),
"bmapmanager 初始化sucsuc!", toast.length_long).show();
}
if (!mbmapmanager.init(mstrkey, new mygenerallistener())) {
toast.maketext(myapplication.getinstance().getapplicationcontext(),
"bmapmanager 初始化错误!", toast.length_long).show();
}
}

public static myapplication getinstance() {
if (myapplication == null) {
myapplication = new myapplication();
}
return myapplication;
}
public void addactivity(activity activity) {
activitylist.add(activity);
}
public void exit() {
for (activity activity : activitylist) {
activity.finish();
}
system.exit(0);
}
// 常用事件监听，用来处理通常的网络错误，授权验证错误等
static class mygenerallistener implements mkgenerallistener {
public void ongetnetworkstate(int ierror) {
if (ierror == mkevent.error_network_connect) {
toast.maketext(
myapplication.getinstance().getapplicationcontext(),
"您的网络出错啦！", toast.length_long).show();
} else if (ierror == mkevent.error_network_data) {
toast.maketext(
myapplication.getinstance().getapplicationcontext(),
"输入正确的检索条件！", toast.length_long).show();
}
// ...
}
public void ongetpermissionstate(int ierror) {
if (ierror == mkevent.error_permission_denied) {
// 授权key错误：
toast.maketext(
myapplication.getinstance().getapplicationcontext(),
"请输入正确的授权key！",
toast.length_long).show();
myapplication.getinstance().m_bkeyright = false;
}
}
}
}

三、编写主程序mainactivity，显示当前所处位置

主程序mainactity：

public class mainactivity extends activity {
public myapplication app;
static mapview mmapview = null;
public mkmapviewlistener mmaplistener = null;
mylocationoverlay mylocationoverlay = null;
// 定位相关
locationclient mlocclient;
public notifylister mnotifyer = null;
public mylocationlistenner mylistener = new mylocationlistenner();
locationdata locdata = null;
private mapcontroller mmapcontroller = null;
static mksearch mkserach;
handler mhandler = new handler() {
public void handlemessage(android.os.message msg) {
toast.maketext(mainactivity.this, "msg:" + msg.what,
toast.length_short).show();
};
};
static textview showaddr;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
showaddr = (textview) findviewbyid(r.id.showaddr);
myicon mi = new myicon(this);
//在屏幕中心点添加接我图标
getwindow().addcontentview(
mi,
new layoutparams(layoutparams.fill_parent,
layoutparams.fill_parent));
myicon2 m2 = new myicon2(this);
getwindow().addcontentview(
m2,
new layoutparams(layoutparams.fill_parent,
layoutparams.fill_parent));
mmapview = (mapview) findviewbyid(r.id.bmapsview);
mmapcontroller = mmapview.getcontroller();
initmapview();
app = myapplication.getinstance();
mlocclient = new locationclient(this);
mlocclient.registerlocationlistener(mylistener);
//搜索初始化
mkserach = new mksearch();
mkserach.init(app.mbmapmanager, new mksearchlistener() {
@override
public void ongetwalkingrouteresult(mkwalkingrouteresult arg0,
int arg1) {
}
@override
public void ongettransitrouteresult(mktransitrouteresult arg0,
int arg1) {
}
@override
public void ongetsuggestionresult(mksuggestionresult arg0, int arg1) {
//
}
@override
public void ongetpoiresult(mkpoiresult arg0, int arg1, int arg2) {
//
}
@override
public void ongetpoidetailsearchresult(int arg0, int arg1) {
//
}
@override
public void ongetdrivingrouteresult(mkdrivingrouteresult arg0,
int arg1) {
//
}
@override
public void ongetbusdetailresult(mkbuslineresult arg0, int arg1) {
//
}
@override
public void ongetaddrresult(mkaddrinfo info, int arg1) {
showaddr.settext(info.straddr);
}
});
//设置地图相关
locationclientoption option = new locationclientoption();
option.setopengps(true);
option.setcoortype("bd09ll");
option.setscanspan(300000);
mlocclient.setlocoption(option);
mlocclient.start();
mmapview.getcontroller().setzoom(16);
mmapview.getcontroller().enableclick(true);
mmapview.displayzoomcontrols(true);
mmaplistener = new mkmapviewlistener() {
public void onmapmovefinish() {
}
public void onclickmappoi(mappoi mappoiinfo) {
if (mappoiinfo != null) {
title = mappoiinfo.strtext;
toast.maketext(mainactivity.this, title, toast.length_short)
.show();
}
}
};
mmapview.regmapviewlistener(myapplication.getinstance().mbmapmanager,
mmaplistener);
mylocationoverlay = new mylocationoverlay(mmapview);
locdata = new locationdata();
mylocationoverlay.setdata(locdata);
mmapview.getoverlays().add(mylocationoverlay);
mylocationoverlay.enablecompass();
mmapview.refresh();
}
private void initmapview() {
mmapview.setlongclickable(true);
}
/**
* 监听函数，又新位置的时候，格式化成字符串，输出到屏幕中
*/
public class mylocationlistenner implements bdlocationlistener {
public void onreceivelocation(bdlocation location) {
if (location == null)
return;
locdata.latitude = location.getlatitude();
locdata.longitude = location.getlongitude();
locdata.direction = 2.0f;
locdata.accuracy = location.getradius();
locdata.direction = location.getderect();
log.d("loctest",
string.format("before: lat: %f lon: %f",
location.getlatitude(), location.getlongitude()));
mylocationoverlay.setdata(locdata);
mmapview.refresh();
mmapcontroller
.animateto(new geopoint((int) (locdata.latitude * 1e6),
(int) (locdata.longitude * 1e6)), mhandler
.obtainmessage(1));
}
public void onreceivepoi(bdlocation poilocation) {
if (poilocation == null) {
return;
}
}
}
public class notifylister extends bdnotifylistener {
public void onnotify(bdlocation mlocation, float distance) {
}
}
@override
protected void onpause() {
mmapview.onpause();
super.onpause();
}
@override
protected void onresume() {
mmapview.onresume();
super.onresume();
}
@override
protected void onsaveinstancestate(bundle outstate) {
super.onsaveinstancestate(outstate);
mmapview.onsaveinstancestate(outstate);
}
@override
protected void onrestoreinstancestate(bundle savedinstancestate) {
super.onrestoreinstancestate(savedinstancestate);
mmapview.onrestoreinstancestate(savedinstancestate);
}
public static void getposition(geopoint g) {
mkserach.reversegeocode(g);
showaddr.settext("获取位置中...");
}
}

xml布局：

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<textview
android:id="@+id/showaddr"
android:gravity="center"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="选择地点"
android:textsize="20dp"
/>
<com.baidu.mapapi.map.mapview
android:id="@+id/bmapsview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true" />
</linearlayout>

三、绘制图形

myicon 的ondraw实现绘制中心点的图标，myicon2绘制指示器图标，如图所示

public class myicon extends view {
public static int w;
public static int h;
public static bitmap mbitmap;
public myicon(context context) {
super(context);
mbitmap = bitmapfactory.decoderesource(getresources(), r.drawable.me);
}
@override
protected void ondraw(canvas canvas) {
super.ondraw(canvas);
w = this.getwidth() / 2 - mbitmap.getwidth() / 2;
h = this.getheight() / 2 - mbitmap.getheight() / 2;
canvas.drawbitmap(mbitmap, w, h, null);
}
}
public class myicon2 extends view{
public static int w;
public static int h;
private bitmap mbitmap;
public myicon2(context context) {
super(context);
mbitmap = bitmapfactory.decoderesource(getresources(), r.drawable.jiewo);
}
@override
protected void ondraw(canvas canvas) {
super.ondraw(canvas);
w = this.getwidth() / 2 - mbitmap.getwidth() / 2;
h = (this.getheight() / 2 - mbitmap.getheight() / 2) - ( myicon.mbitmap.getheight()/2);
canvas.drawbitmap(mbitmap, w, h, null);
}
}

以上所述是小编给大家分享android百度定位导航之基于百度地图移动获取位置和自动定位的相关知识，希望对大家有所帮助。