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Android location manager not updating

Android location manager not updating

This blog post is no longer maintained because it is outdated. Any questions and comments will not be answered. Have you ever wondered how easy or hard it is to implement GPS tracking for your Android application? Do you know which are the challenges of balancing between best accuracy, power consumption and acquisition speed when acquiring a location? Generally there are three concerns that will challenge you the most: Location from newest provider might be significantly less accurate than the estimation coming from an older provider.

Having these three points in mind, and carefully choosing and optimizing your choices can make a huge difference in a good or poor user experience when it comes to GPS tracking.

LocationManager service allows applications to receive periodic updates of mobile device geographical location. Implementation of this method will be covered later. This might not seem that much important to you, but a careful choice of these values can make a difference. Implementation of LocationListener allows us to have some information about the state of used provider.

We can monitor provider status onStatusChanged which gives us information if provider is unable to retrieve a location, or has became available after a period of inactivity, also we can monitor when given provider is disabled onProviderDisabled or enabled onProviderEnabled. What is a Location? This can be used to assess the accuracy and confidence of location.

Keep in mind that accuracy level depends very much from the nature of used provider and it can vary significantly. Android API made a nice way to help you overcome your dilemma. You must think of criteria as a way not to filter out existing providers, but as a list order criteria for location providers. Yes, in most cases all you need is a good choice, so please take a look at source code below: User permissions For your application to access location services, you must teach it to request permissions that user will need to confirm upon application install.

There are a couple of rules you might want to follow: When acquiring initial location fix, use fastest provider.

Network or passive provider give fastest location fix, although they are also most unreliable. Use these providers to give initial hint to user about their location and later improve accuracy as more accurate providers initialize. There is a way to make a fast fix easily: A sample algorithm of filtering out locations is below. Accuracy is radius in meters, so less is better. After handling a location fix with suitable accuracy, display it to user and stop listening to location updates helps conserve power.

If you decide to follow guidelines, your typical timeline should look something like this: Start listening for locations, get a low accuracy level quick fix. Preserve this location until a better one arrives. You will need to wait some time until GPS provider has warmed up found sufficient number of satellites for precise location estimate.

During this time, you will receive numerous location fixes from network and WI-FI provider. Preserve best location by your filtering algorithm. To make things even harder, if user is on move, acquiring precise location can be a very challenging task. Best approach is to use faster smaller location update intervals until GPS provider becomes available.

Larger quantity of locations in a time interval will allow you to make the best pick, but remember, put more precise providers ahead in decision queue. After receiving location with sufficiently high accuracy, depending of your application, you can decide to stop listening to locations if you need a rough estimate of users bearing or slow down the location update intervals in case you need to track users movement trough time.

When designing location filtering algorithm always use at least these three parameters:

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Learn how to track Location by adding a LocationListener



Android location manager not updating

This blog post is no longer maintained because it is outdated. Any questions and comments will not be answered. Have you ever wondered how easy or hard it is to implement GPS tracking for your Android application? Do you know which are the challenges of balancing between best accuracy, power consumption and acquisition speed when acquiring a location? Generally there are three concerns that will challenge you the most: Location from newest provider might be significantly less accurate than the estimation coming from an older provider.

Having these three points in mind, and carefully choosing and optimizing your choices can make a huge difference in a good or poor user experience when it comes to GPS tracking. LocationManager service allows applications to receive periodic updates of mobile device geographical location. Implementation of this method will be covered later. This might not seem that much important to you, but a careful choice of these values can make a difference. Implementation of LocationListener allows us to have some information about the state of used provider.

We can monitor provider status onStatusChanged which gives us information if provider is unable to retrieve a location, or has became available after a period of inactivity, also we can monitor when given provider is disabled onProviderDisabled or enabled onProviderEnabled.

What is a Location? This can be used to assess the accuracy and confidence of location. Keep in mind that accuracy level depends very much from the nature of used provider and it can vary significantly.

Android API made a nice way to help you overcome your dilemma. You must think of criteria as a way not to filter out existing providers, but as a list order criteria for location providers. Yes, in most cases all you need is a good choice, so please take a look at source code below: User permissions For your application to access location services, you must teach it to request permissions that user will need to confirm upon application install.

There are a couple of rules you might want to follow: When acquiring initial location fix, use fastest provider. Network or passive provider give fastest location fix, although they are also most unreliable.

Use these providers to give initial hint to user about their location and later improve accuracy as more accurate providers initialize. There is a way to make a fast fix easily: A sample algorithm of filtering out locations is below.

Accuracy is radius in meters, so less is better. After handling a location fix with suitable accuracy, display it to user and stop listening to location updates helps conserve power. If you decide to follow guidelines, your typical timeline should look something like this: Start listening for locations, get a low accuracy level quick fix. Preserve this location until a better one arrives. You will need to wait some time until GPS provider has warmed up found sufficient number of satellites for precise location estimate.

During this time, you will receive numerous location fixes from network and WI-FI provider. Preserve best location by your filtering algorithm. To make things even harder, if user is on move, acquiring precise location can be a very challenging task. Best approach is to use faster smaller location update intervals until GPS provider becomes available. Larger quantity of locations in a time interval will allow you to make the best pick, but remember, put more precise providers ahead in decision queue.

After receiving location with sufficiently high accuracy, depending of your application, you can decide to stop listening to locations if you need a rough estimate of users bearing or slow down the location update intervals in case you need to track users movement trough time. When designing location filtering algorithm always use at least these three parameters:

Android location manager not updating

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