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package; import java.text.DecimalFormat; import java.util.ArrayList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; import; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.IntentReceiver; import android.database.Cursor; import android.location.Location; import android.location.LocationManager; import android.location.LocationProvider; import android.os.Bundle; import android.provider.Contacts.People; import android.view.Menu; import android.widget.ArrayAdapter; public class Friendfinder extends ListActivity { // =========================================================== // Fields // =========================================================== protected static final String MY_LOCATION_CHANGED_ACTION = new String("android.intent.action.LOCATION_CHANGED"); protected LocationManager myLocationManager = null; protected Location myLocation = null; protected boolean doUpdates = true; MyIntentReceiver myIntentReceiver = null; protected final IntentFilter myIntentFilter = new IntentFilter(MY_LOCATION_CHANGED_ACTION); protected final long MINIMUM_DISTANCECHANGE_FOR_UPDATE = 25; // in Meters protected final long MINIMUM_TIME_BETWEEN_UPDATE = 2500; // in Milliseconds /** Minimum distance in meters for a friend * to be recognize as a Friend to be drawn */ protected static final int NEARFRIEND_MAX_DISTANCE = 10000000; // 10.000km /** List of friends in */ protected ArrayList allFriends = new ArrayList(); // =========================================================== // Extra-Class // =========================================================== /** * This tiny IntentReceiver updates * our stuff as we receive the intents * (LOCATION_CHANGED_ACTION) we told the * myLocationManager to send to us. */ class MyIntentReceiver extends IntentReceiver { @Override public void onReceiveIntent(Context context, Intent intent) { if(Friendfinder.this.doUpdates) Friendfinder.this.updateList(); // Will simply update our list, when receiving an intent } } // =========================================================== // """Constructors""" (or the Entry-Point of it all) // =========================================================== /** Called when the activity is first created. */ @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); /* The first thing we need to do is to setup our own * locationManager, that will support us with our own gps data */ this.myLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); /* Update the list of our friends once on the start, * as they are not(yet) moving, no updates to them are necessary */ this.refreshFriendsList(); /* Initiate the update of the contactList * manually for the first time */ this.updateList(); /* Prepare the things, that will give * us the ability, to receive Information * about our GPS-Position. */ this.setupForGPSAutoRefreshing(); } /** * Restart the receiving, when we are back on line. */ @Override public void onResume() { super.onResume(); this.doUpdates = true; /* As we only want to react on the LOCATION_CHANGED * intents we made the OS send out, we have to * register it along with a filter, that will only * "pass through" on LOCATION_CHANGED-Intents. */ this.registerReceiver(this.myIntentReceiver, this.myIntentFilter); } /** * Make sure to stop the animation when we're no longer on screen, * failing to do so will cause a lot of unnecessary cpu-usage! */ @Override public void onFreeze(Bundle icicle) { this.doUpdates = false; this.unregisterReceiver(this.myIntentReceiver); super.onFreeze(icicle); } /** Register with our LocationManager to send us * an intent (who's Action-String we defined above) * when an intent to the location manager, * that we want to get informed on changes to our own position. * This is one of the hottest features in Android. */ private void setupForGPSAutoRefreshing() { // Get the first provider available List providers = this.myLocationManager.getProviders(); LocationProvider provider = providers.get(0); this.myLocationManager.requestUpdates(provider, MINIMUM_TIME_BETWEEN_UPDATE, MINIMUM_DISTANCECHANGE_FOR_UPDATE, new Intent(MY_LOCATION_CHANGED_ACTION)); /* Create an IntentReceiver, that will react on the * Intents we said to our LocationManager to send to us. */ this.myIntentReceiver = new MyIntentReceiver(); /* * In onResume() the following method will be called automatically! * registerReceiver(this.myIntentReceiver, this.myIntentFilter); */ } /** Called only the first time the options menu is displayed. * Create the menu entries. * Menus are added in the order they are hardcoded. */ @Override public boolean onCreateOptionsMenu(Menu menu) { boolean supRetVal = super.onCreateOptionsMenu(menu); menu.add(0, 0, getString(R.string.main_menu_open_map)); return supRetVal; } @Override public boolean onOptionsItemSelected(Menu.Item item) { switch (item.getId()) { case 0: startSubActivity(new Intent(this, FriendFinderMap.class), 0); return true; } return false; } // =========================================================== // Methods // =========================================================== private void refreshFriendsList(){ Cursor c = getContentResolver().query(People.CONTENT_URI, null, null, null, People.NAME + " ASC"); /* This method allows the activity to take * care of managing the given Cursor's lifecycle * for you based on the activity's lifecycle. */ startManagingCursor(c); int notesColumn = c.getColumnIndex(People.NOTES); int nameColumn = c.getColumnIndex(People.NAME); // Moves the cursor to the first row // and returns true if there is sth. to get if (c.first()) { do { String notesString = c.getString(notesColumn); Location friendLocation = null; if (notesString != null) { // Pattern for extracting geo-ContentURIs from the notes. final String geoPattern = "(geo:[\\-]?[0-9]{1,3}\\.[0-9]{1,6}\\,[\\-]?[0-9]{1,3}\\.[0-9]{1,6}\\#)"; // Compile and use regular expression Pattern pattern = Pattern.compile(geoPattern); CharSequence inputStr = notesString; Matcher matcher = pattern.matcher(inputStr); boolean matchFound = matcher.find(); if (matchFound) { // We take the first match available String groupStr =; // And parse the Lat/Long-GeoPos-Values from it friendLocation = new Location(); String latid = groupStr.substring(groupStr.indexOf(":") + 1, groupStr.indexOf(",")); String longit = groupStr.substring(groupStr.indexOf(",") + 1, groupStr.indexOf("#")); friendLocation.setLongitude(Float.parseFloat(longit)); friendLocation.setLatitude(Float.parseFloat(latid)); } } String friendName = c.getString(nameColumn); allFriends.add(new Friend(friendLocation, friendName)); } while (; } } private void updateList() { // Refresh our location... this.myLocation = myLocationManager.getCurrentLocation("gps"); ArrayList listItems = new ArrayList(); // For each Friend for(Friend aNearFriend : this.allFriends){ /* Load the row-entry-format defined as a String * and replace $name with the contact's name we * get from the cursor */ String curLine = new String(getString(R.string.main_list_format)); curLine = curLine.replace("$name", aNearFriend.itsName); if(aNearFriend.itsLocation != null){ if( this.myLocation.distanceTo(aNearFriend.itsLocation) < NEARFRIEND_MAX_DISTANCE){ final DecimalFormat df = new DecimalFormat("####0.000"); String formattedDistance = df.format(this.myLocation.distanceTo( aNearFriend.itsLocation) / 1000); curLine = curLine.replace("$distance", formattedDistance); } }else{ curLine = curLine.replace("$distance", getString(R.string.main_list_geo_not_set)); } listItems.add(curLine); } ArrayAdapter notes = new ArrayAdapter(this, android.R.layout.simple_list_item_1, listItems); this.setListAdapter(notes); } }