android如何获取经纬度

android 定位的两种方式：gps_provider and network_provider

定位的可以借助locationmanager来实现

mainactivity代码

static final string tag = "mainactivity";
 
 
 private textview locationtv;
 private locationmanager locationmanager;
 private string provider;
 
 arraylist<contactmodel> datalist = new arraylist<contactmodel>();
 
 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
//  initview();
 
 
  locationtv = (textview) findviewbyid(r.id.locaiton_tv);
 
  locationmanager = (locationmanager) getsystemservice(this.location_service);
  // 获取所有可用的位置提供器
  list<string> providerlist = locationmanager.getproviders(true);
  if (providerlist.contains(locationmanager.gps_provider)) {
   provider = locationmanager.gps_provider;
  } else if (providerlist.contains(locationmanager.network_provider)) {
   provider = locationmanager.network_provider;
  } else {
   // 当没有可用的位置提供器时，弹出toast提示用户
   toast.maketext(this, "no location provider to use", toast.length_short).show();
   return;
  }
  location location = locationmanager.getlastknownlocation(provider);
  if (location != null) {
   // 显示当前设备的位置信息
   showlocation(location);
  }
  if (activitycompat.checkselfpermission(this, android.manifest.permission.access_fine_location) != packagemanager.permission_granted && activitycompat.checkselfpermission(this, android.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(provider, 5000, 1, locationlistener); 
 }
 private void showlocation(location location) {
  string currentposition = "latitude is " + location.getlatitude() + "\n"+ "longitude is " + location.getlongitude();
  locationtv.settext(currentposition);
 }
 
 @override
 protected void ondestroy() {
  super.ondestroy();
 
  if (locationmanager != null) {
 
   if (activitycompat.checkselfpermission(this, android.manifest.permission.access_fine_location) != packagemanager.permission_granted && activitycompat.checkselfpermission(this, android.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;
   }
 
 
   // 关闭程序时将监听器移除
   locationmanager.removeupdates(locationlistener);
  }
 }
 
 locationlistener locationlistener = new locationlistener() {
  @override
  public void onlocationchanged(location location) {
 
   toast.maketext(mainactivity.this,"onlocationchanged",toast.length_short).show();
  }
 
  @override
  public void onstatuschanged(string s, int i, bundle bundle) {
   toast.maketext(mainactivity.this,"onstatuschanged",toast.length_short).show();
  }
 
  @override
  public void onproviderenabled(string s) {
   toast.maketext(mainactivity.this,"onproviderenabled",toast.length_short).show();
  }
 
  @override
  public void onproviderdisabled(string s) {
   toast.maketext(mainactivity.this,"onproviderdisabled",toast.length_short).show();
  }
 };

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