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POGetting longitude and latitude works in emulator but not on device?
 

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  1. POGetting longitude and latitude works in emulator but not on device?
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    <p>I've been trying to work GPS coordinates but it's been a lot tougher than I thought. After a few hours of trial and error, I've managed to output the latitude and longitude (mocked) for my emulator. Below are the 2 ways I've done it:</p> <p>First way:</p> <pre><code>import java.io.IOException; import java.util.Calendar; import java.util.List; import java.util.Locale; import android.app.Activity; import android.content.Context; import android.location.Address; import android.location.Geocoder; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.widget.TextView; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String text = ""; LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER); if(location != null) { showMyAddress(location); } final LocationListener locationListener = new LocationListener() { public void onLocationChanged(Location location) { showMyAddress(location); } public void onProviderDisabled(String arg0) { } public void onProviderEnabled(String arg0) { } public void onStatusChanged(String arg0, int arg1, Bundle arg2) { } }; lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 30000, 10, locationListener); double longitude = location.getLongitude(); double latitude = location.getLatitude(); Log.i(TAG, "longitude: " + longitude); Log.i(TAG, "latitude: " + latitude); text = "longitude: " + longitude + ", " + "latitude: " + latitude; TextView textView = (TextView) findViewById(R.id.txtvwMain); textView.setText(text); } private void showMyAddress(Location location) { double latitude = location.getLatitude(); double longitude = location.getLongitude(); Geocoder myLocation = new Geocoder(getApplicationContext(), Locale.getDefault()); List&lt;Address&gt; myList; try { myList = myLocation.getFromLocation(latitude, longitude, 1); } catch (IOException e1) { e1.printStackTrace(); } } } </code></pre> <p>Second way:</p> <pre><code>import android.app.Activity; import android.content.Context; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.util.Log; import android.widget.TextView; public class MainActivity extends Activity implements LocationListener { private LocationManager lm; private TextView tv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv = (TextView) findViewById(R.id.txtvwMain); lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 500, 1, this); Location location = lm.getLastKnownLocation(lm.GPS_PROVIDER); double longitude = location.getLongitude(); double latitude = location.getLatitude(); tv.setText("latitude="+latitude+", longitude="+longitude); } @Override public void onLocationChanged(Location arg0) { String lat = String.valueOf(arg0.getLatitude()); String lon = String.valueOf(arg0.getLongitude()); Log.e("GPS", "location changed: lat="+lat+", lon="+lon); tv.setText("lat="+lat+", lon="+lon); } public void onProviderDisabled(String arg0) { Log.e("GPS", "provider disabled " + arg0); } public void onProviderEnabled(String arg0) { Log.e("GPS", "provider enabled " + arg0); } public void onStatusChanged(String arg0, int arg1, Bundle arg2) { Log.e("GPS", "status changed to " + arg0 + " [" + arg1 + "]"); } } </code></pre> <p>Both ways above work and print out the mock latitude and longitude onto a TextView in the emulator (running Android 4.2.2). However, when I upload the .apk file onto my device (tablet running Android 4.0.4), it just crashes. I don't know what's wrong because I can't see any error messages. What is the source of the problem and how may I go about solving it? Thanks.</p>
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    1. PTQuestion
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    1. USuser2323030
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    1. COCan you include the stack trace from logcat when the crash occurs?
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      1. POGetting longitude and latitude works in emulator but not on device?
      1. USFlynn81
    2. COIt doesn't crash when I run the emulator (everything works fine there, so there's nothing notable from logcat). It only crashes when I use it on my device. Unless, is there a way to view the logcat when running on a physical device?
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      1. POGetting longitude and latitude works in emulator but not on device?
      1. USuser2323030
    3. COYeah, connect to your computer with a USB cable, in the DDMS perspective in Eclipse choose your phone from the list of devices (there should be a tab called devices). Logcat will then display from the phone.
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      1. POGetting longitude and latitude works in emulator but not on device?
      1. USFlynn81
 

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