如何使用Android的LocationManager和监听器 [英] How to use Android LocationManager and Listener
本文介绍了如何使用Android的LocationManager和监听器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我没有任何运气使用下面的code接收来自GPS的任何数据，我不知道我做错了，好像我的code匹配的一切，我在网上看到的。我想最终将它添加到一个后台服务登录的GPS坐标，即使该活动是不可见的，或者其他应用程序是开放的，如果速度大于一定的预定量，但在这一点上，我不能即使得到任何数据的展现出来。我是比较新的到Android，但我想不出什么我做错了？
公共类MainActivity延伸活动{
的TextView TextView的;
MyLocationListener myLocationListener;
LocationManager流明;
@覆盖
保护无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_main）;
this.textView =（TextView中）findViewById（R.id.message）;
addLocationListener（）;
}
@覆盖
公共布尔onCreateOptionsMenu（功能菜单）{
//充气菜单;这增加了项目操作栏，如果它是present。
。getMenuInflater（）膨胀（R.menu.main，菜单）;
返回true;
}
私人无效addLocationListener（）
{
LM =（LocationManager）getSystemService（Context.LOCATION_SERVICE）;
标准C =新标准（）;
c.setAccuracy（Criteria.ACCURACY_FINE）;
最终字符串提供程序= lm.getBestProvider（C，真正的）;
this.myLocationListener =新MyLocationListener（）;
this.lm.requestLocationUpdates（LocationManager.GPS_PROVIDER，0L，0.0F，this.myLocationListener）;
//lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER，0L，0.0F，myLocationListener）;
Log.d（LOC_SERVICE，服务运行！）;
}
公共无效updateLocation（位置定位）
{
双纬度，经度;
纬度= location.getLatitude（）;
经度= location.getLongitude（）;
INT英里= convertSpeed（location.getSpeed（））;
Log.d（LOC_SERVICE，英里：+英里每小时）;
this.textView.setText（this.textView.getText（）+\ N+纬度：+纬度+LNG+经度+英里+英里）;
}
私人诠释convertSpeed（浮点速度）{
INT英里=（INT）（2.236936D *速度）;
返回英里;
}
类MyLocationListener实现LocationListener的{
@覆盖
公共无效onLocationChanged（位置定位）{
Log.d（LOC_SERVICE，监听器正在运行！）;
updateLocation（位置）;
}
@覆盖
公共无效onProviderDisabled（字符串提供商）{}
@覆盖
公共无效onProviderEnabled（字符串提供商）{}
@覆盖
公共无效onStatusChanged（字符串商，INT地位，捆绑演员）{}
}
}
解决方案
试试下面的code -
包com.muslimcompanion.utills;
进口android.app.AlertDialog;
进口android.app.Service;
进口android.content.Context;
进口android.content.DialogInterface;
进口android.content.Intent;
进口android.location.Location;
进口android.location.LocationListener;
进口android.location.LocationManager;
进口android.os.Bundle;
进口android.os.IBinder;
进口android.provider.Settings;
进口android.util.Log;
公共类GPSTracker扩展服务实现LocationListener的{
私人最终语境mContext;
//标志GPS状态
布尔isGPSEnabled = FALSE;
//标志网络状态
布尔isNetworkEnabled = FALSE;
//标志GPS状态
布尔canGetLocation = FALSE;
地点位置; // 位置
双纬度; // 纬度
双经度; // 经度
//最小距离改变以米为单位更新
私有静态最后长MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; //10米
//毫秒更新之间的最短时间
私有静态最后长MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1分钟
//声明一个位置管理
保护LocationManager locationManager;
公共GPSTracker（上下文的背景下）{
this.mContext =背景;
的getLocation（）;
}
公共场所的getLocation（）{
尝试 {
locationManager =（LocationManager）mContext
.getSystemService（LOCATION_SERVICE）;
//获取GPS状态
isGPSEnabled = locationManager
.isProviderEnabled（LocationManager.GPS_PROVIDER）;
//获取网络状态
isNetworkEnabled = locationManager
.isProviderEnabled（LocationManager.NETWORK_PROVIDER）;
如果（isGPSEnabled＆安培;！＆安培;！isNetworkEnabled）{
//没有网络提供商启用
} 其他 {
this.canGetLocation = TRUE;
//首先从网络提供商处获取位置
如果（isNetworkEnabled）{
locationManager.requestLocationUpdates（
LocationManager.NETWORK_PROVIDER，
MIN_TIME_BW_UPDATES，
MIN_DISTANCE_CHANGE_FOR_UPDATES，这一点）;
Log.d（网络，网络）;
如果（locationManager！= NULL）{
位置= locationManager
.getLastKnownLocation（LocationManager.NETWORK_PROVIDER）;
如果（位置！= NULL）{
纬度= location.getLatitude（）;
经度= location.getLongitude（）;
}
}
}
//如果GPS功能的获得纬度/经度使用GPS服务
如果（isGPSEnabled）{
如果（位置== NULL）{
locationManager.requestLocationUpdates（
LocationManager.GPS_PROVIDER，
MIN_TIME_BW_UPDATES，
MIN_DISTANCE_CHANGE_FOR_UPDATES，这一点）;
Log.d（GPS功能的，GPS功能的）;
如果（locationManager！= NULL）{
位置= locationManager
.getLastKnownLocation（LocationManager.GPS_PROVIDER）;
如果（位置！= NULL）{
纬度= location.getLatitude（）;
经度= location.getLongitude（）;
}
}
}
}
}
}赶上（例外五）{
e.printStackTrace（）;
}
返回的位置;
}
公共无效stopUsingGPS（）{
如果（locationManager！= NULL）{
locationManager.removeUpdates（GPSTracker.this）;
}
}
公共双getLatitude（）{
如果（位置！= NULL）{
纬度= location.getLatitude（）;
}
//返回纬度
返回纬度;
}
公共双getLongitude（）{
如果（位置！= NULL）{
经度= location.getLongitude（）;
}
//返回经度
返回经度;
}
公共布尔canGetLocation（）{
返回this.canGetLocation;
}
公共无效showSettingsAlert（）{
AlertDialog.Builder alertDialog =新AlertDialog.Builder（mContext）;
//设置对话框标题
alertDialog.setTitle（全球定位系统设置）;
//设置对话框消息
alertDialog.setMessage（GPS未启用你想进入设置菜单。？）;
//在pressing设置按钮
alertDialog.setPositiveButton（设置，新DialogInterface.OnClickListener（）{
公共无效的onClick（DialogInterface对话，诠释它）{
意向意图=新的意图（Settings.ACTION_LOCATION_SOURCE_SETTINGS）;
mContext.startActivity（意向）;
dialog.cancel（）;
}
}）;
alertDialog.setCancelable（假）;
alertDialog.show（）;
}
@覆盖
公共无效onLocationChanged（位置定位）{
}
@覆盖
公共无效onProviderDisabled（字符串提供商）{
}
@覆盖
公共无效onProviderEnabled（字符串提供商）{
}
@覆盖
公共无效onStatusChanged（字符串商，INT地位，捆绑演员）{
}
@覆盖
公众的IBinder onBind（意向为arg0）{
返回null;
}
}
现在把这些线到你的活动 -
GPSTracker GPS =新GPSTracker（本）;
INT状态= 0;
如果（gps.canGetLocation（））
{
状态= GooglePlayServicesUtil
.isGooglePlayServicesAvailable（getApplicationContext（））;
如果（状态== ConnectionResult.SUCCESS）{
current_lattitude = gps.getLatitude（）;
current_longitude = gps.getLongitude（）;
_app prefs.saveSmsBody（+ current_lattitude）;
_app prefs.saveSmsBody（+ current_longitude）;
Log.d（dashlatlongon，+ current_lattitude + -
+ current_longitude）;
如果（current_lattitude == 0.0＆功放;＆安培; current_longitude == 0.0）{
current_lattitude = 22.22;
current_longitude = 22.22;
}
} 其他 {
current_lattitude = 22.22;
current_longitude = 22.22;
}
}
其他
{
gps.showSettingsAlert（）;
}
I'm not having any luck receiving any data from the GPS using the code below, and i'm not sure what I'm doing wrong, it seems like my code matches everything i see online. i'd like to eventually add this to a background service to log gps coordinates even when the activity isn't visible or if other apps are open and if the speed is greater than a certain defined amount, but at this point I can't even get any of the data to show up. i'm relatively new to android but i can't figure out what am i doing wrong?
public class MainActivity extends Activity {
TextView textView;
MyLocationListener myLocationListener;
LocationManager lm;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.textView = (TextView)findViewById(R.id.message);
addLocationListener();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private void addLocationListener()
{
lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Criteria c = new Criteria();
c.setAccuracy(Criteria.ACCURACY_FINE);
final String PROVIDER = lm.getBestProvider(c, true);
this.myLocationListener = new MyLocationListener();
this.lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0L, 0.0F, this.myLocationListener);
//lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0L, 0.0F, myLocationListener);
Log.d("LOC_SERVICE", "Service RUNNING!");
}
public void updateLocation(Location location)
{
double latitude, longitude;
latitude = location.getLatitude();
longitude = location.getLongitude();
int mph = convertSpeed(location.getSpeed());
Log.d("LOC_SERVICE", "mph: "+mph);
this.textView.setText(this.textView.getText()+"\n"+"lat: "+latitude+" lng: "+longitude+" mph: "+mph);
}
private int convertSpeed(float speed) {
int mph =(int)(2.236936D * speed);
return mph;
}
class MyLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location location) {
Log.d("LOC_SERVICE", "Listener RUNNING!");
updateLocation(location);
}
@Override
public void onProviderDisabled(String provider) {}
@Override
public void onProviderEnabled(String provider) {}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
}
}
解决方案
Try following code -
package com.muslimcompanion.utills;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
// First get location from Network Provider
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
public boolean canGetLocation() {
return this.canGetLocation;
}
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
dialog.cancel();
}
});
alertDialog.setCancelable(false);
alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
Now put these line into your activity -
GPSTracker gps = new GPSTracker(this);
int status = 0;
if(gps.canGetLocation())
{
status = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(getApplicationContext());
if (status == ConnectionResult.SUCCESS) {
current_lattitude = gps.getLatitude();
current_longitude = gps.getLongitude();
_appPrefs.saveSmsBody("" + current_lattitude);
_appPrefs.saveSmsBody("" + current_longitude);
Log.d("dashlatlongon", "" + current_lattitude + "-"
+ current_longitude);
if (current_lattitude == 0.0 && current_longitude == 0.0) {
current_lattitude = 22.22;
current_longitude = 22.22;
}
} else {
current_lattitude = 22.22;
current_longitude = 22.22;
}
}
else
{
gps.showSettingsAlert();
}
这篇关于如何使用Android的LocationManager和监听器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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