使用GPS位置

Question

Upon activity launch, the GPS is enabled and grabs the user latitude, longitude and report it to parse as a Geopoint. The issue is that the GPS continuously runs in the background and continuously report to Parse location. I would only want the GPS to grab the location information once and then stops immediately, as by myself I have notice that I have reached around 20k request with Parse on a day and I think its because it runs continuously in the background.

Below is the activity code:

public class MoodActivity extends Activity {

    private FeedbackDialog feedBack;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mood);
        feedBack = new FeedbackDialog(this, "");
         LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
           LocationListener mlocListener = new MyLocationListener();

           mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener);







        final TextView teating = (TextView) this.findViewById(R.id.tdinning);
        teating.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MoodActivity.this.startActivity(new Intent(MoodActivity.this, CasualEventsActivity.class));
            }
        });

        final ImageView ieating = (ImageView) this.findViewById(R.id.idinning);
        ieating.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MoodActivity.this.startActivity(new Intent(MoodActivity.this, CasualEventsActivity.class));
            }
        });

        final TextView tdrinks = (TextView) this.findViewById(R.id.tcasual);
        tdrinks.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MoodActivity.this.startActivity(new Intent(MoodActivity.this, CasualEventsActivity.class));
            }
        });

        final ImageView idrinks = (ImageView) this.findViewById(R.id.icasual);
        idrinks.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MoodActivity.this.startActivity(new Intent(MoodActivity.this, CasualEventsActivity.class));
            }
        });

        final TextView tshows = (TextView) this.findViewById(R.id.tshows);
        tshows.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MoodActivity.this.startActivity(new Intent(MoodActivity.this, EntertainmentEventsActivity.class));
            }
        });

        final ImageView ishows = (ImageView) this.findViewById(R.id.ishows);
        ishows.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MoodActivity.this.startActivity(new Intent(MoodActivity.this, EntertainmentEventsActivity.class));
            }
        });

        final TextView tarts = (TextView) this.findViewById(R.id.tculture);
        tarts.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MoodActivity.this.startActivity(new Intent(MoodActivity.this, CultureEventsActivity.class));
            }
        });

        final ImageView iarts = (ImageView) this.findViewById(R.id.iculture);
        iarts.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MoodActivity.this.startActivity(new Intent(MoodActivity.this, CultureEventsActivity.class));
            }
        });

        final Button viewall = (Button) this.findViewById(R.id.brandom);
        viewall.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MoodActivity.this.startActivity(new Intent(MoodActivity.this, CasualEventsActivity.class));
            }
        });
    }



    @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_activity_actions, menu);
        getActionBar().setDisplayShowTitleEnabled(false);



        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle presses on the action bar items
        switch (item.getItemId()) {
            case R.id.pageExperience:
                openPageExperience();
                return true;
            case R.id.pageMessaging:
                openPageMessage();
                return true;

            case R.id.pageEventsBooking:
                openPageBook();
                return true;

            case R.id.pageProfile:
                openPageProfile();
                return true;

            case R.id.pageReport:
                openPageReport();
                return true;

            case R.id.pageAbout:
                openPageAbout();
                return true;

            case R.id.pageLogout:
                openPageLogout();
                return true;

            default:
                return super.onOptionsItemSelected(item);
        }
    }

    private void openPageLogout() {
        // TODO Auto-generated method stub
        //Now call logout
        ParseUser.logOut();
        Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
        startActivity(intent);
    }



    private void openPageAbout() {
        // TODO Auto-generated method stub

    }

    private void openPageReport() {
        // TODO Auto-generated method stub
        FeedbackSettings feedbackSettings = new FeedbackSettings();

        //SUBMIT-CANCEL BUTTONS
        feedbackSettings.setCancelButtonText("No");
        feedbackSettings.setSendButtonText("Send");

        //DIALOG TEXT
        feedbackSettings.setText("Hey, would you like to give us some feedback so that we can improve your experience?");
        feedbackSettings.setYourComments("Type your question here...");
        feedbackSettings.setTitle("Feedback Dialog Title");

        //TOAST MESSAGE
        feedbackSettings.setToast("Thank you so much!");
        feedbackSettings.setToastDuration(Toast.LENGTH_SHORT);  // Default
        feedbackSettings.setToastDuration(Toast.LENGTH_LONG);

        //RADIO BUTTONS
        feedbackSettings.setRadioButtons(false); // Disables radio buttons
        feedbackSettings.setBugLabel("Bug");
        feedbackSettings.setIdeaLabel("Idea");
        feedbackSettings.setQuestionLabel("Question");

        //RADIO BUTTONS ORIENTATION AND GRAVITY
        feedbackSettings.setOrientation(LinearLayout.HORIZONTAL); // Default
        feedbackSettings.setOrientation(LinearLayout.VERTICAL);
        feedbackSettings.setGravity(Gravity.RIGHT); // Default
        feedbackSettings.setGravity(Gravity.LEFT);
        feedbackSettings.setGravity(Gravity.CENTER);

        //SET DIALOG MODAL
        feedbackSettings.setModal(true); //Default is false

        //DEVELOPER REPLIES
        feedbackSettings.setReplyTitle("Message from the Developer");
        feedbackSettings.setReplyCloseButtonText("Close");
        feedbackSettings.setReplyRateButtonText("RATE!");

        //DEVELOPER CUSTOM MESSAGE (NOT SEEN BY THE END USER)
        feedbackSettings.setDeveloperMessage("This is a custom message that will only be seen by the developer!");
        feedBack.show();
    }

    private void openPageProfile() {
        // TODO Auto-generated method stub
        Intent intent = new Intent(this, profileDetailsActivity.class);
        startActivity(intent);

    }

    private void openPageBook() {
        // TODO Auto-generated method stub

    }

    private void openPageMessage() {
        // TODO Auto-generated method stub

    }

    private void openPageExperience() {
        // TODO Auto-generated method stub
        Intent intent = new Intent(this, MoodActivity.class);
        startActivity(intent);
    }

    public class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location loc) {
            // TODO Auto-generated method stub
            double lati = loc.getLatitude();
            double longi = loc.getLongitude();

            ParseUser currentUser = ParseUser.getCurrentUser();
            currentUser.saveInBackground();

            ParseGeoPoint point = new ParseGeoPoint(lati, longi);
            currentUser.put("location", point);

            currentUser.saveInBackground(new SaveCallback() {
                @Override
                public void done(ParseException e) {
                    setProgressBarIndeterminateVisibility(false);

                    if (e == null) {
                        // Success!

                    } else {

                    }
                }
            });

        }

           @Override
           public void onProviderDisabled(String provider) {
               // TODO Auto-generated method stub
               Toast.makeText(getApplicationContext(),"Gps Disabled",Toast.LENGTH_SHORT).show();

           }

           @Override
           public void onProviderEnabled(String provider) {
               // TODO Auto-generated method stub
               Toast.makeText(getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show();


           }

           @Override
           public void onStatusChanged(String provider, int status, Bundle extras) {
               // TODO Auto-generated method stub

           }
          }
}

If you need any clarification, let me know. Thanks in advance.

Update I've tried working with Single update instead, but it does not seem to be working.

Under onCreate

LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
           LocationListener mlocListener = new MyLocationListener();


           mlocManager.requestSingleUpdate(LocationManager.GPS_PROVIDER, mlocListener, Looper.myLooper());

and

    public class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location loc) {
            // TODO Auto-generated method stub
            double lati = loc.getLatitude();
            double longi = loc.getLongitude();

            ParseUser currentUser = ParseUser.getCurrentUser();
            currentUser.saveInBackground();

            ParseGeoPoint point = new ParseGeoPoint(lati, longi);
            currentUser.put("location", point);

            currentUser.saveInBackground(new SaveCallback() {
                @Override
                public void done(ParseException e) {
                    setProgressBarIndeterminateVisibility(false);

                    if (e == null) {
                        // Success!

                    } else {

                    }
                }
            });

        }

           @Override
           public void onProviderDisabled(String provider) {
               // TODO Auto-generated method stub
               Toast.makeText(getApplicationContext(),"Gps Disabled",Toast.LENGTH_SHORT).show();

           }

           @Override
           public void onProviderEnabled(String provider) {
               // TODO Auto-generated method stub
               Toast.makeText(getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show();


           }

           @Override
           public void onStatusChanged(String provider, int status, Bundle extras) {
               // TODO Auto-generated method stub

           }
          }
}

Answer 1

you have to find a way to removeupdates like

mlocManager.removeUpdates(mlocListener);

after you send your parse information

Answer 2

Besides what @JRowan said, You can also use:

String provider = LocationManager.getBestProvider(new Criteria(), true);
Location myLocation = LocationManager.getLastKnowLocation(provider);

If your location timing doesn't have to be exact, that is, if you can afford the location data to be somewhat old.

Method link

Answer 3

When you call LocationManager.requestLocationUpdates(), the system will continuously provide location updates through the LocationListener given in that call.

If you are interested in getting only one location update, you have two choices:

1. Use LocationManager.requestSingleUpdate()
2. Use LocationManager.requestLocationUpdates() but cancel the updates after receiving the first update.

I will go ahead with 2 since you already have some code.You need to first declare your variable mLocManager to be a class field rather than declare it locally in onCreate(). You then need to add the following code in your LocationListener.

    public class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location loc) {

            double lati = loc.getLatitude();
            double longi = loc.getLongitude();

            mlocManager.remoteUpdates(this); // ADD THIS STATEMENT

            // The rest of your code goes here ...

        }

   }