我必须找到用户的位置，即使我关闭应用程序，它仍然在后台继续。代码工作正常，它显示正确的位置，但当我点击＆＃34;启动服务＆＃34;它崩溃了。我找不到错误： GPS跟踪课程
package com.malay.gpsservice;
import android.annotation.SuppressLint;
import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
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.util.Log;
import android.widget.Toast;
public class GPSTracService extends Service implements LocationListener {
// DECLARE ALL THE VARIABLES
Location location = null; // location
LocationManager locationManager;
boolean isGPSEnabled = false;
boolean isNetworkEnabled=false;
String msg = "CAUTION! If kept open, can consume lots of battery";
// FOR FOREGROUND_ID
int FORE_ID = 1335;
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@SuppressLint("NewApi")
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
Intent noty_intent = new Intent(this,
com.malay.gpsservice.MainActivity.class);
noty_intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent pIntent = PendingIntent.getActivity(this, 0, noty_intent,
0);
Notification n = new Notification.Builder(this)
.setContentTitle("GPS Serice is running...")
.setContentText(msg).setSmallIcon(R.drawable.ic_launcher)
.setContentIntent(pIntent).setAutoCancel(true).setOngoing(true)
.build();
startForeground(FORE_ID, n);
try {
locationManager = (LocationManager) this
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled=locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
// 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 (!isGPSEnabled) {
} else {
// 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);
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Toast.makeText(this,
"Location Listener on GPS started...",
Toast.LENGTH_SHORT).show();
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception ex) {
Toast.makeText(this,
"Some Error occur while starting Location Listener",
Toast.LENGTH_SHORT).show();
ex.printStackTrace();
}
return (START_STICKY);
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
if (locationManager != null) {
locationManager.removeUpdates((LocationListener) this);
locationManager = null;
}
stopForeground(true);
Toast.makeText(this, "Location Listener on GPS Stopped...",
Toast.LENGTH_SHORT).show();
super.onDestroy();
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
这是主要活动：
package com.malay.gpsservice;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends Activity implements LocationListener{
Context mcontext=this;
boolean isGpsEnabled=false;
boolean isNetworkEnabled=false;
boolean canGetLocation=false;
protected LocationManager locManager;
Location loc=null;
double latitude;
double longitude;
double accuracy;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATE=20;
private static final long MIN_TIME_BETWEEN_UPDATE=1000*60;
double latitudet;
double longitudet;
double accuracyt;
TextView tview;
TextView tlat;
TextView tlon;
TextView tacc;
String lat;
String lon;
String acc;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loc=getLocation();
tview = (TextView) findViewById(R.id.textView1);
try {
getGPSLoc();
} catch (Exception e) {
e.printStackTrace();
}
}
@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;
}
public boolean onMenuItemSelected(int featureId, MenuItem item) {
//Refresh Button
if (item.getItemId() == R.id.ref) {
getLocation();
getGPSLoc();
}
return super.onMenuItemSelected(featureId, item);
}
public void getGPSLoc() {
if (latitude != 0.0 && longitude != 0.0) {
tview.setText("Location Fixed");
} else {
tview.setText("Waiting for Location...");
}
if (canGetLocation) {
latitudet=(double)Math.round(latitude*1000000)/1000000;
tlat = (TextView) findViewById(R.id.lat);
lat = Double.toString(latitudet);
tlat.setText(lat);
longitudet=(double)Math.round(longitude*1000000)/1000000;
tlon = (TextView) findViewById(R.id.lon);
lon = Double.toString(longitudet);
tlon.setText(lon);
accuracyt=(double)Math.round(accuracy*100)/100;
tacc = (TextView) findViewById(R.id.acc);
acc = Double.toString(accuracyt);
tacc.setText(acc);
}
}
public Location getLocation(){
try{
locManager=(LocationManager)mcontext.getSystemService(LOCATION_SERVICE);
isGpsEnabled=locManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled=locManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if(isGpsEnabled || isNetworkEnabled){
this.canGetLocation=true;
// First get location from Network Provider
if(isNetworkEnabled){
locManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BETWEEN_UPDATE, MIN_DISTANCE_CHANGE_FOR_UPDATE, (LocationListener) this);
Log.d("Network","Network");
if(locManager!=null){
loc=locManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if(loc!=null){
latitude=loc.getLatitude();
longitude=loc.getLongitude();
accuracy=loc.getAccuracy();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if(isGpsEnabled){
locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BETWEEN_UPDATE, MIN_DISTANCE_CHANGE_FOR_UPDATE, (LocationListener) this);
Log.d("GPS Enabled","GPS Enabled");
if(locManager!=null){
loc=locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(loc!=null){
latitude=loc.getLatitude();
longitude=loc.getLongitude();
accuracy=loc.getAccuracy();
}
}
}
}
}
catch(Exception e){
e.printStackTrace();
}
return loc;
}
public void startServ(View vw){
Intent gps=new Intent(this,GPSTracService.class);
this.startService(gps);
}
public void stopServ(View vw){
Intent gps=new Intent(this,GPSTracService.class);
this.stopService(gps);
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.malay.gpsservice"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.malay.gpsservice.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>
<service android:name=".GPSTracService" />
</application>
</manifest>
答案 0 :(得分：1)
在服务中使用getApplicationContext()代替this。
更改为以下行。
Intent noty_intent = new Intent(getApplicationContext(), com.malay.gpsservice.MainActivity.class);
.
.
Notification n = new Notification.Builder(getApplicationContext())
而不是
Intent noty_intent = new Intent(this, com.malay.gpsservice.MainActivity.class);
注意：必须在menifest.xml中声明服务，如果它丢失了。
更新：
使用以下代码进行通知
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext())
.setStyle(new NotificationCompat.BigTextStyle().bigText("App Name"))
.setContentText("App Name");
startForeground(1, mBuilder.build());
使用 android.support.v7 库并设置目标版本 21