i've an app that plots the route between the current user's position and that of a postcode from another activity. It all works well apart from one feature. I've implemented a timer via a handler/runnable mechanism. If the display is not touched for a predetermined time eg 2 mins, then i go back to the menu screen where the usewr has to log in again. It's a security feature of my app.
I've overridden the dispatchTouchEvent method so that when the user touches the screen the timer is reset. This part is not working correctly. The app goes to the menu screen regardless whether the user has touched the screen or not.
I thought that if i set the handler and runnable to null and remove all callbacks to the runnable before starting the timer again would work.
Can anyone tell me how to cancel the current runnable and restart it again.
Here's the full code, thank in advance. matt.
public class GetClientDirections extends MapActivity implements LocationListener{
private MapController mapController;
private MapView mapView;
private List<Overlay> mapOverlays;
private StringBuffer response = null;
private static final String TAG = GetClientDirections.class.getSimpleName();
private double lon;
private double lat;
private JSONArray routes = null;
private JSONObject bounds = null;
private JSONObject northeast = null;
private JSONObject anonObject;
private JSONObject overViewPolyline;
private String stringUrl;
private String polyPoints;
Context context;
private String endAddr;
private GeoPoint startAddr;
BroadcastReceiver locationChangereceiver;
double lati;
double lngi;
boolean isTrafficOn;
SharedPreferences appSharedPrefs;
Handler handler;
Runnable runnable;
String rotaAutoLogout;
int rotaAutoLogoutAsInt;
final String QRCODE_ACTION = "com.carefreegroup.QRCODE_ACTION";
NfcScannerApplication nfcscannerapplication;
private LocationManager locationManager;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mapview);
Intent intent = this.getIntent();
String postcode = intent.getStringExtra("postcode");
Log.e(TAG, "postcode = " + postcode);
appSharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
nfcscannerapplication = (NfcScannerApplication) getApplication();
context = this;
endAddr = postcode;
isTrafficOn = false;
rotaAutoLogout = appSharedPrefs.getString("120", null);
rotaAutoLogoutAsInt = Integer.parseInt(rotaAutoLogout);
if(rotaAutoLogoutAsInt > 0){
initHandler();
handler.postDelayed(runnable, rotaAutoLogoutAsInt * 1000);
}
}// end of onCreate
public void initHandler(){
handler = new Handler();
runnable = new Runnable() {
public void run() {
returnToMenu();
}
private void returnToMenu() {
Intent intent2 = new Intent(GetClientDirections.this,
NfcscannerActivity.class);
intent2.setAction(QRCODE_ACTION);
intent2.putExtra("carerid", nfcscannerapplication.getCarerID());
startActivity(intent2);
}
};
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
Log.e(TAG, "screen touched");
if(rotaAutoLogoutAsInt > 0){
handler.removeCallbacks(runnable);
handler = null;
runnable = null;
initHandler();
handler.postDelayed(runnable, rotaAutoLogoutAsInt * 1000);
Log.e(TAG, " reset timer");
}
return super.dispatchTouchEvent(ev);
}
@Override
protected void onPause() {
locationManager.removeUpdates(this);
handler.removeCallbacks(runnable);
super.onPause();
}
@Override
protected void onResume() {
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
handler.removeCallbacks(runnable);
initHandler();
handler.postDelayed(runnable, rotaAutoLogoutAsInt * 1000);
super.onResume();
}
@Override
protected void onStop() {
handler.removeCallbacks(runnable);
super.onStop();
}
private class AsyncGetRoute extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
getRoute();
return null;
}
@Override
protected void onPostExecute(Void result) {
String jsonOutput = response.toString();
Log.e(TAG, "jsonOutput = " + jsonOutput);
JSONObject results = null;
try {
results = new JSONObject(jsonOutput);
routes = results.getJSONArray("routes");
anonObject = routes.getJSONObject(0);
bounds = anonObject.getJSONObject("bounds");
overViewPolyline = anonObject.getJSONObject("overview_polyline");
polyPoints = overViewPolyline.getString("points");
Log.e(TAG, "overview_polyline = " + overViewPolyline);
Log.e(TAG, "points = " + polyPoints);
northeast = bounds.getJSONObject("northeast");
lat = (Double) northeast.get("lat");
lon = (Double) northeast.get("lng");
Log.e(TAG, "lon/lat = " + lon + " " + lat);
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
List<GeoPoint> list = decodePoly(polyPoints);
mapView = (MapView) findViewById(R.id.cfmapview);
mapView.setBuiltInZoomControls(true);
mapView.setEnabled(true);
mapView.setSatellite(true);
mapController = mapView.getController();
mapController.setZoom(10);
mapOverlays = mapView.getOverlays();
mapOverlays.clear();
mapOverlays.add(new RoutePathOverlay(list, getApplicationContext()));
mapController.animateTo(new GeoPoint(list.get(0).getLatitudeE6(), list
.get(0).getLongitudeE6()));
mapView.invalidate();
super.onPostExecute(result);
}
}
public void getRoute() {
response = new StringBuffer();
URL url = null;
try {
url = new URL(stringUrl);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
HttpURLConnection httpconn = null;
try {
httpconn = (HttpURLConnection) url.openConnection();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
if (httpconn.getResponseCode() == HttpURLConnection.HTTP_OK) {
// Log.e(TAG,"response code OK ");
BufferedReader input = new BufferedReader(
new InputStreamReader(httpconn.getInputStream()), 8192);
String strLine = null;
while ((strLine = input.readLine()) != null) {
// Log.e(TAG,""+strLine);
response.append(strLine);
}
input.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}// end of getRoute
private List<GeoPoint> decodePoly(String encoded) {
List<GeoPoint> poly = new ArrayList<GeoPoint>();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
while (index < len) {
int b, shift = 0, result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
GeoPoint p = new GeoPoint((int) (((double) lat / 1E5) * 1E6),
(int) (((double) lng / 1E5) * 1E6));
poly.add(p);
}
return poly;
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
@Override
public void onLocationChanged(Location location) {
lati = (location.getLatitude());
lngi = (location.getLongitude());
startAddr = new GeoPoint((int)(lati*1000000.0), (int)(lngi*1000000.0));
Log.e(TAG, "lat = " + lati);
Log.e(TAG, "lon = " + lngi);
Log.e(TAG, "lat after cast = " + (int)(lati * 1000000));
Log.e(TAG, "lon after cast = " + (int)(lngi * 1000000));
locationManager.removeUpdates(this);
StringBuilder sb = new StringBuilder();
sb.append("http://maps.google.com/maps/api/directions/json?origin=");
//sb.append(startAddr);
sb.append(lati);
sb.append(",");
sb.append(lngi);
sb.append("&destination=");
sb.append(endAddr);
sb.append("&sensor=false");
stringUrl = sb.toString();
Log.e(TAG, "url = " + stringUrl);
AsyncGetRoute agr = new AsyncGetRoute();
agr.execute();
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.layout.menutogglemapview, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.satellite:
mapView.setSatellite(true);
return true;
case R.id.terrain:
mapView.setSatellite(false);
return true;
case R.id.traffic:
if(isTrafficOn == false){
mapView.setTraffic(true);
isTrafficOn = true;
}else{
mapView.setTraffic(false);
isTrafficOn = false;
}
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
