Mobila applikationer med Android: Lektion 7

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="se.nekotronic.simplegps"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="7" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".SimpleGPSTestActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
 
    </application>

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
</manifest>

    1	package se.nekotronic.simplegps;
    2	
    3	import java.text.DecimalFormat;
    4	
    5	import android.app.Activity;
    6	import android.content.Context;
    7	import android.location.Location;
    8	import android.location.LocationListener;
    9	import android.location.LocationManager;
   10	import android.location.LocationProvider;
   11	import android.os.Bundle;
   12	import android.text.format.Time;
   13	import android.widget.TextView;
   14	
   15	public class SimpleGPSTestActivity extends Activity {
   16	    private TextView texten = null;
   17	    private LocationManager location_manager;
   18	    private LocationListener location_listener;
   19	
   20	    private void print(String text) {
   21	        Time now = new Time();
   22	        now.setToNow();
   23	        String timeString = now.format("%H:%M:%S");
   24	        String line = timeString + ": " + text + "\n";
   25	        texten.setText(texten.getText() + line);
   26	        texten.invalidate();
   27	        texten.postInvalidate();
   28	    }
   29	
   30	    DecimalFormat dec = new DecimalFormat("0.0000");
   31	
   32	    /** Called when the activity is first created. */
   33	    @Override
   34	    public void onCreate(Bundle savedInstanceState) {
   35	        super.onCreate(savedInstanceState);
   36	        
   37	        texten = new TextView(this);
   38	        texten.setText("");
   39	        setContentView(texten);
   40	
   41	        print("onCreate");
   42	
   43	        location_manager =
   44	            (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
   45	        
   46	        location_listener = new LocationListener() {
   47	            @Override
   48	            public void onLocationChanged(Location location) {
   49	                double longitude = location.getLongitude();
   50	                double latitude = location.getLatitude();
   51	                double accuracy = location.getAccuracy();
   52	                double altitude= location.getAltitude();
   53	                print("New location: Long " + dec.format(longitude) +
   54	                      ", lat " + dec.format(latitude) +
   55	                      ", accuracy " + dec.format(accuracy) +
   56	                      ", alt " + dec.format(altitude));
   57	            }
   58	            
   59	            @Override
   60	            public void onProviderDisabled(String provider) {
   61	                 print("Location provider has been disabled.");
   62	            }
   63	
   64	            @Override
   65	            public void onProviderEnabled(String provider) {
   66	                 print("Good news! Location provider has been enabled.");
   67	            }
   68	
   69	            @Override
   70	            public void onStatusChanged(String provider, int status,
   71	                    Bundle extras) {
   72	                if (status == LocationProvider.OUT_OF_SERVICE)
   73	                    print("GPS status changed to OUT_OF_SERVICE.");
   74	                else if (status == LocationProvider.TEMPORARILY_UNAVAILABLE)
   75	                    print("GPS status changed to TEMPORARILY_UNAVAILABLE.");
   76	                else if (status == LocationProvider.AVAILABLE)
   77	                    print("Good news! GPS status changed to AVAILABLE.");
   78	            }
   79	        };
   80	    }
   81	
   82	    @Override
   83	    protected void onPause() {
   84	        super.onPause();
   85	        print("onPause");
   86	        location_manager.removeUpdates(location_listener);
   87	    }
   88	
   89	    @Override
   90	    protected void onResume() {
   91	        super.onResume();
   92	        print("onResume");
   93	        try {
   94	            // Register the listener with the Location Manager to receive
   95	            // location updates
   96	            location_manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, location_listener);
   97	        }
   98	        catch (Exception e) {
   99	            print("Couldn't use the GPS: " + e + ", " + e.getMessage());
  100	        }
  101	    }
  102	}