在Android中获取位置更新
您好,我使用的代码如下: 这里我使用TextView显示一次位置坐标。 现在,如果位置不断更改,我如何在TextView中不断更新位置 我现在使用的代码:这是我的主要活动在Android中获取位置更新,android,location,updates,Android,Location,Updates,您好,我使用的代码如下: 这里我使用TextView显示一次位置坐标。 现在,如果位置不断更改,我如何在TextView中不断更新位置 我现在使用的代码:这是我的主要活动 package com.example.locationtests; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.TextView; public class M
package com.example.locationtests;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GPSTracker mGPS = new GPSTracker(this);
TextView text = (TextView) findViewById(R.id.texts);
if(mGPS.canGetLocation ){
mGPS.getLocation();
text.setText("Lat"+mGPS.getLatitude()+"Lon"+mGPS.getLongitude());
}else{
text.setText("Unabletofind");
System.out.println("Unable");
}
}
@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;
}
}
This is the class im using for Tracking:
package com.example.locationtests;
import android.app.AlertDialog;
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.provider.Settings;
import android.util.Log;
public final class GPSTracker implements LocationListener {
private final Context mContext;
// flag for GPS status
public 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 = 1; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
/**
* Function to get the user's current location
*
* @return
*/
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(Context.LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
Log.v("isGPSEnabled", "=" + isGPSEnabled);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
Log.v("isNetworkEnabled", "=" + isNetworkEnabled);
if (isGPSEnabled == false && isNetworkEnabled == false) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
location=null;
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) {
location=null;
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;
}
/**
* Stop using GPS listener Calling this function will stop using GPS in your
* app
* */
public void stopUsingGPS() {
if (locationManager != null) {
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude() {
if (location != null) {
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
*
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog On pressing Settings button will
* lauch Settings Options
* */
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);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
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) {
}
}
This is my AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.locationtests"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.location" android:required="true" />
<uses-feature android:name="android.hardware.location.gps" android:required="false" />
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.locationtests.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
package com.example.locationtests;
导入android.os.Bundle;
导入android.app.Activity;
导入android.view.Menu;
导入android.widget.TextView;
公共类MainActivity扩展了活动{
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GPSTracker mGPS=新的GPSTracker(本);
TextView text=(TextView)findViewById(R.id.text);
if(mGPS.canGetLocation){
mGPS.getLocation();
text.setText(“Lat”+mGPS.getLatitude()+“Lon”+mGPS.getLatitude());
}否则{
text.setText(“无法查找”);
System.out.println(“无法”);
}
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
}
这是im用于跟踪的类:
包com.example.locationtests;
导入android.app.AlertDialog;
导入android.content.Context;
导入android.content.DialogInterface;
导入android.content.Intent;
导入android.location.location;
导入android.location.LocationListener;
导入android.location.LocationManager;
导入android.os.Bundle;
导入android.provider.Settings;
导入android.util.Log;
公共最终类GPSTracker实现LocationListener{
私有最终上下文mContext;
//GPS状态标志
公共布尔值isGPSEnabled=false;
//网络状态标志
布尔值isNetworkEnabled=false;
//GPS状态标志
布尔值canGetLocation=false;
位置;//位置
双纬度;//纬度
双经度;//经度
//更改更新的最小距离(以米为单位)
私有静态最终长距离最小距离更改更新=1;//10米
//更新之间的最短时间(以毫秒为单位)
私有静态最终长MIN\u时间\u BW\u更新=1;//1分钟
//声明位置管理器
受保护的LocationManager LocationManager;
公共GPSTracker(上下文){
this.mContext=上下文;
getLocation();
}
/**
*函数获取用户的当前位置
*
*@返回
*/
公共位置getLocation(){
试一试{
locationManager=(locationManager)mContext
.getSystemService(Context.LOCATION\u服务);
//获取GPS状态
isGPSEnabled=位置管理器
.isprovidenabled(LocationManager.GPS\U提供商);
Log.v(“isGPSEnabled”,“=”+isGPSEnabled);
//获取网络状态
isNetworkEnabled=locationManager
.isProviderEnabled(LocationManager.NETWORK_提供商);
Log.v(“isNetworkEnabled”,“=”+isNetworkEnabled);
if(isGPSEnabled==false&&isNetworkEnabled==false){
//未启用任何网络提供程序
}否则{
this.canGetLocation=true;
if(可联网){
位置=空;
locationManager.RequestLocationUpdate(
LocationManager.NETWORK\u提供程序,
最短时间更新,
最小距离\u更改\u用于更新,此);
Log.d(“网络”、“网络”);
如果(locationManager!=null){
位置=位置管理器
.getLastKnownLocation(LocationManager.网络提供商);
如果(位置!=null){
纬度=位置。getLatitude();
longitude=location.getLongitude();
}
}
}
//如果启用GPS,则使用GPS服务获取横向/纵向
如果(isGPSEnabled){
位置=空;
if(位置==null){
locationManager.RequestLocationUpdate(
LocationManager.GPS\u提供程序,
最短时间更新,
最小距离\u更改\u用于更新,此);
Log.d(“GPS启用”、“GPS启用”);
如果(locationManager!=null){
位置=位置管理器
.getLastKnownLocation(LocationManager.GPS\U提供商);
如果(位置!=null){
纬度=位置。getLatitude();
longitude=location.getLongitude();
}
}
}
}
}
}捕获(例外e){
e、 printStackTrace();
}
返回位置;
}
/**
*停止使用GPS侦听器调用此函数将停止在您的系统中使用GPS
*应用程序
* */
使用GPS()的公共无效停止{
如果(locationManager!=null){
locationManager.RemoveUpdate(GPSTracker.this);
}
}
/**
*获取纬度的函数
* */
公共双纬度(){
如果(位置!=null){
纬度=位置。getLatitude();
}
//返回纬度
返回纬度;
}
/**
*函数获取经度
* */
公共双getLongitude(){
如果(位置!=null){
longitude=location.getLongitude();
}
//返回经度
返回经度;
}
/**
*用于检查已启用GPS/wifi的功能
*
*@返回布尔值
* */
locationManager.requestLocationUpdates(..., ..., ..., this);
@Override
public void onLocationChanged(Location location) {
}
GPSTracker mGPS = new GPSTracker(this);
public GPSTracker(Context context) {
this.mContext = context;
@Override
public void onLocationChanged(Location location)
{
TextView text = (TextView) ((Activity)mContext).findViewById(R.id.texts);
text.setText("Lat"+location.getLatitude()+"Lon"+location.getLongitude());
}
@Override
public void onLocationChanged(Location location) {
Log.d(TAG, "GPS LocationChanged");
double lat = location.getLatitude();
double lng = location.getLongitude();
Log.d(TAG, "Received GPS request for " + String.valueOf(lat) + "," + String.valueOf(lng) + " , ready to rumble!");
// Do clever stuff here
}