/
DisplayTrackMap.java
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/
DisplayTrackMap.java
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package me.guillaumin.android.osmtracker.activity;
import java.util.ArrayList;
import java.util.List;
import me.guillaumin.android.osmtracker.OSMTracker;
import me.guillaumin.android.osmtracker.R;
import me.guillaumin.android.osmtracker.db.TrackContentProvider;
import me.guillaumin.android.osmtracker.db.TrackContentProvider.Schema;
import org.osmdroid.contributor.util.constants.OpenStreetMapContributorConstants;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapController;
import org.osmdroid.views.MapView;
import org.osmdroid.views.overlay.ItemizedOverlay;
import org.osmdroid.views.overlay.OverlayItem;
import org.osmdroid.views.overlay.PathOverlay;
import org.osmdroid.views.overlay.SimpleLocationOverlay;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.ContentObserver;
import android.database.Cursor;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
/**
* Display current track over an OSM map.
* Based on osmdroid code http://osmdroid.googlecode.com/
*
* @author Viesturs Zarins
*
*/
public class DisplayTrackMap extends Activity implements OpenStreetMapContributorConstants{
@SuppressWarnings("unused")
private static final String TAG = DisplayTrackMap.class.getSimpleName();
/**
* Key for keeping the zoom level in the saved instance bundle
*/
private static final String CURRENT_ZOOM = "currentZoom";
/**
* Key for keeping the last zoom level across app. restart
*/
private static final String LAST_ZOOM = "lastZoomLevel";
/**
* Default zoom level
*/
private static final int DEFAULT_ZOOM = 16;
/**
* Main OSM view
*/
private MapView osmView;
/**
* Controller to interact with view
*/
private MapController osmViewController;
/**
* OSM view overlay that displays current location
*/
private SimpleLocationOverlay myLocationOverlay;
/**
* OSM view overlay that displays current path
*/
private PathOverlay pathOverlay;
/**
* List of waypoints to display on the map.
*/
private List<OverlayItem> wayPointItems = new ArrayList<OverlayItem>();
/**
* Current track id
*/
private long currentTrackId;
/**
* whether the map display should be centered to the gps location
*/
private boolean centerToGpsPos = true;
/**
* the last position we know
*/
private GeoPoint currentPosition;
/**
* The row id of the last location read from the database that has been added to the
* list of layout points. Using this we to reduce DB load by only reading new points.
* Initially null, to indicate that no data has yet been read.
*/
private Integer lastTrackPointIdProcessed = null;
/**
* Observes changes on trackpoints
*/
private ContentObserver trackpointContentObserver;
/**
* Keeps the SharedPreferences
*/
private SharedPreferences prefs = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// loading the preferences
prefs = PreferenceManager.getDefaultSharedPreferences(this);
setContentView(R.layout.displaytrackmap);
currentTrackId = getIntent().getExtras().getLong(Schema.COL_TRACK_ID);
setTitle(getTitle() + ": #" + currentTrackId);
// Initialize OSM view
osmView = (MapView) findViewById(R.id.displaytrackmap_osmView);
// we'll use osmView to define if the screen is always on or not
osmView.setKeepScreenOn(prefs.getBoolean(OSMTracker.Preferences.KEY_UI_DISPLAY_KEEP_ON, OSMTracker.Preferences.VAL_UI_DISPLAY_KEEP_ON));
osmViewController = osmView.getController();
// Check if there is a saved zoom level
if(savedInstanceState != null) {
osmViewController.setZoom(savedInstanceState.getInt(CURRENT_ZOOM, DEFAULT_ZOOM));
} else {
// Try to get last zoom Level from Shared Preferences
SharedPreferences settings = getPreferences(MODE_PRIVATE);
osmViewController.setZoom(settings.getInt(LAST_ZOOM, DEFAULT_ZOOM));
}
createOverlays();
// Create content observer for trackpoints
trackpointContentObserver = new ContentObserver(new Handler()) {
@Override
public void onChange(boolean selfChange) {
pathChanged();
}
};
// Register listeners for zoom buttons
findViewById(R.id.displaytrackmap_imgZoomIn).setOnClickListener( new OnClickListener() {
@Override
public void onClick(View v) {
osmViewController.zoomIn();
}
});
findViewById(R.id.displaytrackmap_imgZoomOut).setOnClickListener( new OnClickListener() {
@Override
public void onClick(View v) {
osmViewController.zoomOut();
}
});
}
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putInt(CURRENT_ZOOM, osmView.getZoomLevel());
super.onSaveInstanceState(outState);
}
@Override
protected void onResume() {
// setKeepScreenOn depending on user's preferences
osmView.setKeepScreenOn(prefs.getBoolean(OSMTracker.Preferences.KEY_UI_DISPLAY_KEEP_ON, OSMTracker.Preferences.VAL_UI_DISPLAY_KEEP_ON));
// Register content observer for any trackpoint changes
getContentResolver().registerContentObserver(
TrackContentProvider.trackPointsUri(currentTrackId),
true, trackpointContentObserver);
// Forget the last waypoint read from the DB
// This ensures that all waypoints for the track will be reloaded
// from the database to populate the path layout
lastTrackPointIdProcessed = null;
// Reload path
pathChanged();
// Refresh way points
refreshWayPointItems();
super.onResume();
}
@Override
protected void onPause() {
// Unregister content observer
getContentResolver().unregisterContentObserver(trackpointContentObserver);
// Clear the points list.
pathOverlay.clearPath();
super.onPause();
}
@Override
protected void onStop() {
super.onStop();
// Save zoom level in shared preferences
SharedPreferences settings = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putInt(LAST_ZOOM, osmView.getZoomLevel());
editor.commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.displaytrackmap_menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
menu.findItem(R.id.displaytrackmap_menu_center_to_gps).setEnabled( (!centerToGpsPos && currentPosition != null ) );
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case R.id.displaytrackmap_menu_center_to_gps:
centerToGpsPos = true;
if(currentPosition != null){
osmViewController.animateTo(currentPosition);
}
break;
case R.id.displaytrackmap_menu_settings:
// Start settings activity
startActivity(new Intent(this, Preferences.class));
break;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_MOVE:
centerToGpsPos = false;
break;
}
return super.onTouchEvent(event);
}
/**
* Creates overlays over the OSM view
*/
private void createOverlays() {
pathOverlay = new PathOverlay(Color.BLUE, this);
osmView.getOverlays().add(pathOverlay);
myLocationOverlay = new SimpleLocationOverlay(this);
osmView.getOverlays().add(myLocationOverlay);
osmView.getOverlays().add(new ItemizedOverlay<OverlayItem>(this, wayPointItems, null));
}
/**
* Refreshes the list of {@link OverlayItem} that display way points.
*/
private void refreshWayPointItems() {
wayPointItems.clear();
Cursor c = getContentResolver().query(
TrackContentProvider.waypointsUri(currentTrackId),
null, null, null, TrackContentProvider.Schema.COL_TIMESTAMP + " asc");
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
OverlayItem i = new OverlayItem(
c.getString(c.getColumnIndex(Schema.COL_NAME)),
c.getString(c.getColumnIndex(Schema.COL_NAME)),
new GeoPoint(
c.getDouble(c.getColumnIndex(Schema.COL_LATITUDE)),
c.getDouble(c.getColumnIndex(Schema.COL_LONGITUDE)))
);
i.setMarker(getResources().getDrawable(R.drawable.star));
wayPointItems.add(i);
}
c.close();
}
/**
* On track path changed, update the two overlays and repaint view.
*/
private void pathChanged() {
if (isFinishing()) {
return;
}
// Projection: The columns to retrieve. Here, we want the latitude,
// longitude and primary key only
String[] projection = {Schema.COL_LATITUDE, Schema.COL_LONGITUDE, Schema.COL_ID};
// Selection: The where clause to use
String selection = null;
// SelectionArgs: The parameter replacements to use for the '?' in the selection
String[] selectionArgs = null;
// Only request the track points that we have not seen yet
// If we have processed any track points in this session then
// lastTrackPointIdProcessed will not be null. We only want
// to see data from rows with a primary key greater than lastTrackPointIdProcessed
if (lastTrackPointIdProcessed != null) {
selection = TrackContentProvider.Schema.COL_ID + " > ?";
List<String> selectionArgsList = new ArrayList<String>();
selectionArgsList.add(lastTrackPointIdProcessed.toString());
selectionArgs = selectionArgsList.toArray(new String[1]);
}
// Retrieve any points we have not yet seen
Cursor c = getContentResolver().query(
TrackContentProvider.trackPointsUri(currentTrackId),
projection, selection, selectionArgs, Schema.COL_ID + " asc");
int numberOfPointsRetrieved = c.getCount();
if (numberOfPointsRetrieved > 0 ) {
c.moveToFirst();
double lastLat = 0;
double lastLon = 0;
int primaryKeyColumnIndex = c.getColumnIndex(Schema.COL_ID);
int latitudeColumnIndex = c.getColumnIndex(Schema.COL_LATITUDE);
int longitudeColumnIndex = c.getColumnIndex(Schema.COL_LONGITUDE);
// Add each new point to the track
while(!c.isAfterLast()) {
lastLat = c.getDouble(latitudeColumnIndex);
lastLon = c.getDouble(longitudeColumnIndex);
lastTrackPointIdProcessed = c.getInt(primaryKeyColumnIndex);
pathOverlay.addPoint((int)(lastLat * 1e6), (int)(lastLon * 1e6));
c.moveToNext();
}
// Last point is current position.
currentPosition = new GeoPoint(lastLat, lastLon);
myLocationOverlay.setLocation(currentPosition);
if(centerToGpsPos) {
osmViewController.setCenter(currentPosition);
}
// Repaint
osmView.invalidate();
}
c.close();
}
}