Android实现地理定位功能

<uses-permission android:name="android.permission.access_coarse_location" /> 
 <uses-permission android:name="android.permission.access_fine_location"/> 
 <uses-permission android:name="android.permission.internet"/> 

package com.example.a5.myapplication; 
 
import android.manifest; 
import android.content.context; 
import android.content.pm.packagemanager; 
import android.location.criteria; 
import android.location.location; 
import android.location.locationlistener; 
import android.location.locationmanager; 
import android.support.v4.app.activitycompat; 
import android.support.v7.app.alertdialog; 
import android.support.v7.app.appcompatactivity; 
import android.os.bundle; 
import android.view.view; 
import android.view.window; 
import android.view.windowmanager; 
import android.webkit.webview; 
import android.widget.button; 
import android.widget.textview; 
 
public class mainactivity extends appcompatactivity { 
 
 @override 
 protected void oncreate(bundle savedinstancestate) { 
  super.oncreate(savedinstancestate); 
  requestwindowfeature(window.feature_no_title); 
  //全屏 
  getwindow().setflags(windowmanager.layoutparams.flag_fullscreen, 
    windowmanager.layoutparams.flag_fullscreen); 
  setcontentview(r.layout.activity_main); 
  button button = (button) findviewbyid(r.id.button); 
  button.setonclicklistener(new view.onclicklistener() { 
   @override 
   public void onclick(view v) { 
    //获取位置服务 
    locationmanager locationmanager = (locationmanager) mainactivity.this.getsystemservice(context.location_service); 
    criteria criteria = new criteria(); 
    //accuracy_high/accuracy_low精度选择 
    criteria.setaccuracy(criteria.accuracy_fine); 
    //高度 
    criteria.setaltituderequired(true); 
    //方位信息 
    criteria.setbearingrequired(true); 
    //是否允许付费 
    criteria.setcostallowed(true); 
    //对电量的要求 
    criteria.setpowerrequirement(criteria.power_low); 
    //速度 
    criteria.setspeedrequired(true); 
    //获取最佳服务 
    string provider = locationmanager.getbestprovider(criteria, true); 
    //权限检查 
    if (activitycompat.checkselfpermission(mainactivity.this, manifest.permission.access_fine_location) != packagemanager.permission_granted && activitycompat.checkselfpermission(mainactivity.this, manifest.permission.access_coarse_location) != packagemanager.permission_granted) { 
     return; 
    } 
    //获取到了位置 
    location location = locationmanager.getlastknownlocation(provider); 
    //开启地理位置监听定位类型、毫秒、米、监听时间 
    locationmanager.requestlocationupdates(provider,3000,1,new listener()); 
    locateresult(location); 
 
   } 
  }); 
 } 
 public class listener implements locationlistener { 
 
  @override 
  public void onlocationchanged(location location) { 
   //位置变化，获取最新的位置 
   locateresult(location); 
  } 
 
  @override 
  public void onstatuschanged(string provider, int status, bundle extras) { 
 
  } 
 
  @override 
  public void onproviderenabled(string provider) { 
 
  } 
 
  @override 
  public void onproviderdisabled(string provider) { 
 
  } 
 } 
 
 public void locateresult(location location){ 
  new alertdialog.builder(mainactivity.this) 
    .setmessage("纬度" + string.valueof(location.getlatitude()) + 
      "\n经度" + string.valueof(location.getlongitude()) + 
      "\n速度" + string.valueof(location.getspeed()) + 
      "\n高度" + string.valueof(location.getaltitude()) + 
      "\n朝向" + string.valueof(location.getbearing()) 
    ) 
    .setnegativebutton("取消",null) 
    .show(); 
 } 
}