我想每2分钟更新一次到服务器的位置，我在onResume中启动了计时器，在计时器类中我启动了API Rest Calls但是当应用程序被销毁时意味着我无法调用Rest Call。
我怀疑是否必须将计时器放在服务类中，在哪里放置计时器。
Mainactivity.java
public class UserHomePage extends AppCompatActivity i {
SharedPreferences gs_sharepref_latlong;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Mapbox.getInstance(this, getString(R.string.access_token));
setContentView(R.layout.user_activity_home);
ctx=this;
Intent intent = new Intent(ctx,
MyLocationService.class);
startService(intent);
}
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
protected void onStop() {
super.onStop();
}
@Override
protected void onResume() {
super.onResume();
myTask = new MyTimerTask();
timer = new Timer();
timer.schedule(myTask, 0, 120000);
}
// timer task to sending lat and long for each 2 minutes
class MyTimerTask extends TimerTask {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
ctx.startService(new Intent(ctx,MyLocationService.class));
gs_sharepref_latlong = ctx.getSharedPreferences("myprefer", Context.MODE_PRIVATE);
String gs_str_Latitude1 = gs_sharepref_latlong.getString("Lat", null);
String gs_str_Longitude1 = gs_sharepref_latlong.getString("Long", null);
GS_UserUpdateLocation(ctx,gs_str_Latitude1,gs_str_Longitude1);
// Toast.makeText(ctx, "LATLONG-**-" + gs_str_Latitude1 + "***********" + gs_str_Longitude1, Toast.LENGTH_LONG).show();
}
});
}
}
public void GS_UserUpdateLocation(Context context, final String gs_var_latitude, final String gs_var_longitude) {
StringRequest stringRequest = new StringRequest(Request.Method.POST, ServerUtils.GS_UserLocationupdate,
new com.android.volley.Response.Listener<String>() {
@Override
public void onResponse(String response) {
}
},
new com.android.volley.Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new Hashtable<String, String>();
params.put("gs_userId", gs_var_userid);
params.put("gs_lattitude", gs_var_latitude);
params.put("gs_longitude", gs_var_longitude);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
服务类
public class MyLocationService extends Service implements GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener, LocationListener {
LocationManager locationManager ;
SharedPreferences sharedPreferences;
SharedPreferences.Editor editor;
Timer timer;
MyTimerTask myTask;
String gs_var_userid,gs_var_roleid;
private GoogleApiClient mGoogleApiClient = null;
private LatLng gs_var_mLatLng;
private static final LocationRequest REQUEST = LocationRequest.create()
.setInterval(12000)
.setFastestInterval(16)
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
public static boolean isGPSEnabled = false;
public static boolean isNetworkEnabled = false;
//to check gps is enabled or not
@Override
public void onCreate() {
super.onCreate();
locationManager = (LocationManager) getApplicationContext().getSystemService(LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
buildGoogleApiClient();
}
@Override
public void onLowMemory() {
super.onLowMemory();
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onDestroy() {
super.onDestroy();
// Log.i("RR","----destroy--");
if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
private synchronized void buildGoogleApiClient() {
try {
mGoogleApiClient = new GoogleApiClient.Builder(getApplicationContext())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
try {
if (ActivityCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient,
REQUEST,
this); // LocationListener
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onConnectionSuspended(int i) {
}
// to get current latitude and longitude
// storing the updated latitde and longitude when user moving and reach destination
@Override
public void onLocationChanged(Location location) {
try {
gs_var_mLatLng = new LatLng(location.getLatitude(), location.getLongitude());
Log.i("WW","service class"+gs_var_mLatLng);
sharedPreferences = getSharedPreferences("myprefer", MODE_PRIVATE);
editor = sharedPreferences.edit();
gs_var_userid=Prefs.getuserid(getApplicationContext());
editor.putString("Lat", String.valueOf(location.getLatitude()));
editor.putString("Long", String.valueOf(location.getLongitude()));
editor.commit();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
}
注意：如果我在执行onLocationchanged之前将启动命令中的计时器显示为空对象纬度和经度，则启动onstart命令。请帮助我。即使应用程序被销毁状态我想更新位置
答案 0 :(得分：0)
使用此：
.setInterval(120000)
.setFastestInterval(120000)
每2分钟获取一次位置。