Android Application Development Cookbook: 93 Recipes for Building Winning Apps

Recipe 8.3 Monitoring a Location

Android Versions

Level 1 and above

Permissions

android.permission.ACCESS_FINE_LOCATION

Source Code to Download from Wrox.com

MonitorLocation.zip

Your application wants to monitor a particular location, and when the device is near that location you want to perform some actions. This is very useful if you are writing an application that reminds you when you are near places of interest, for example.

Solution

One very cool feature of the LocationManager class is its ability to monitor a specific location. This is achieved using the addProximityAlert() method.

The following code snippet shows how to monitor a particular location so that if the user is within a five-meter radius of that location, your application will fire a PendingIntent object to launch the web browser:

package net.learn2develop.monitorlocation;

import android.app.Activity;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.location.LocationManager;
import android.net.Uri;
import android.os.Bundle;

public class MainActivity extends Activity {
    LocationManager lm;
    PendingIntent pendingIntent;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //---use the LocationManager class to obtain locations data---
        lm = (LocationManager)
            getSystemService(Context.LOCATION_SERVICE);
    }
    @Override
 public void onResume() ...