Develop Reference

How do I manipulate a View from another class in Android?

I have a handler for receiving SMS in a seperate class. How can I make it change the view elements when the handler is executed?
Here is my code:
public class MainActivity extends MapActivity {
MapView mapView;
MapController mc;
GeoPoint p;
private int carNumber;
private String langt;
private String longt;
CheckedTextView text;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SmsReceiver smsreceiver = new SmsReceiver();
draw();
}
public void draw() {
mapView = (MapView) findViewById(R.id.mapView);
LinearLayout zoomLayout = (LinearLayout) findViewById(R.id.zoom);
#SuppressWarnings("deprecation")
View zoomView = mapView.getZoomControls();
zoomLayout.addView(zoomView, new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
mapView.displayZoomControls(true);
mc = mapView.getController();
double lat = Double.parseDouble("31.977185185185185");
double lng = Double.parseDouble("35.205925925925925");
p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
mc.animateTo(p);
mc.setZoom(17);
MapOverlay mapOverlay = new MapOverlay();
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.clear();
listOfOverlays.add(mapOverlay);
mapView.invalidate();
}
}
}
Here is the SMS Receiver class:
public class SmsReceiver extends BroadcastReceiver {
MapView mapView;
MapController mc;
GeoPoint p;
private int carNumber;
private String langt;
private String longt;
CheckedTextView text;
public SmsReceiver(MapView mapView) {
this.mapView = mapView;
}
private static final String SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";
#SuppressLint("NewApi") #Override
public void onReceive(final Context context, final Intent intent) {
if (intent != null && SMS_RECEIVED.equals(intent.getAction())) {
final SmsMessage smsMessage = extractSmsMessage(intent);
processMessage(context, smsMessage);
}
}
#SuppressLint("NewApi") private SmsMessage extractSmsMessage(final Intent intent) {
final Bundle pudsBundle = intent.getExtras();
final Object[] pdus = (Object[]) pudsBundle.get("pdus");
final SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) pdus[0]);
return smsMessage;
}
}
I want to modify the MapView inside the SmsReceiver class.
Thank you.

Define an interface and use a callback to let the activity know that an SMS has been received.
public Interface SmsReceivedListener {
void onSmsReceived(int arg1, string arg2); ..<----add arguments you want to pass back
}
In your SMS class
ArrayList<SmsReceivedistener> listeners = new ArrayList<SmsReceivedistener>();
...
public void setSmsReceivedistener(SmsReceivedistenerlistener){
listeners.add(listener);
}
When you receive an SMS
for (SmsReceivedistener listener:listeners){
listener.onSmsReceived(arg1, arg2);
}
In your Activity:
public class MainActivity extends MapActivity implements SmsReceivedListener {
...
#Override
public void onCreate(Bundle savedInstanceState)
{
...
smsReceiver.setSmsReceivedistener(this);
...
}
public void onSmsReceived(int arg1, string arg2){
// do whatever you need to do
}
All from memory so please excuse typos and you should improve the SMS class by adding removeSmsReceivedistener and checking that you do not add the same listener twice in setSmsReceivedistener.
Note. Because you use an interface, any class (not just an Activity) can implement it so you can update anywhere in your app. The smsReceiver class doesn't know or care. It just calls the listeners, if any are registered.

Try this
TextView bt1 =m_activity.findViewById(R.id.textview1);
In the above example where view bt1 is from another class.you can access bt1 by using class instance and get the id.Now,do what ever you want do with bt1 instance.
Note: Make Sure bt1 is public in another class

Add this to your onReceive() method:
if (context instanceof MainActivity) {
//modify the map
((MainActivity)context).findViewById(...);
}

Overlays not displaying in android maps

So I'm just trying to create a generic mapView in android and put a few geopoints in it. I've followed the instructions from the android developer website and had no success... can anyone help? here is my code.
public class HelloItemizedOverlay extends ItemizedOverlay {
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
Context mContext;
public HelloItemizedOverlay(Drawable defaultMarker, Context context) {
// defines the bounds for the overlayItems
super(boundCenterBottom(defaultMarker));
mContext = context;
}
#Override
protected OverlayItem createItem(int i) {
// returns the correct ArrayList position from int i
return mOverlays.get(i);
}
#Override
public int size() {
// returns number of items in ArrayList
return mOverlays.size();
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
#Override
protected boolean onTap(int index) {
OverlayItem item = mOverlays.get(index);
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle(item.getTitle());
dialog.setMessage(item.getSnippet());
dialog.show();
return true;
}
}
//Here's my main class
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.maptastic);
((TextView)((FrameLayout)((LinearLayout)((ViewGroup) getWindow().getDecorView()).getChildAt(0)).getChildAt(0)).getChildAt(0)).setGravity(Gravity.CENTER);
setTitle("Field Trip");
Drawable drawable = this.getResources().getDrawable(R.drawable.supaaaa);
HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable,this);
//initControls();
MapView mapview = (MapView) findViewById(R.id.mapView);
mapview.setBuiltInZoomControls(true);
mcontroller = mapview.getController();
// Plot all geo points
for (Entry<Integer, FieldTripStop> cur : Statics.fieldTripStops.entrySet())
{
// get the FieldTripStop object from the current hash table entry
Statics.currentFTStop = cur.getValue();
// concatenate numbers before (all) and after (6) the decimal, since
// geopoints only accept 6 numbers past the decimal.
theLat = Statics.currentFTStop.latitude;
theLong = Statics.currentFTStop.longitude;
/*
* String manipulation method
*
* theLat = theLat.replace(".","");
* theLat = theLat.substring(0, 8);
* theLong = theLong.replace(".","");
* theLong = theLong.substring(0, 8);
* point = new GeoPoint((int)(Integer.valueOf(theLat)), (int)(Integer.valueOf(theLong)));
*/
theDLat = Double.parseDouble(theLat);
theDLong = Double.parseDouble(theLong);
//olay = new OverlayItem(point, "herp", "derp");
//olayitems.add(olay);
List<Overlay> mapOverlays = mapview.getOverlays();
point = new GeoPoint((int)(theDLat*1E6), (int)(theDLong*1E6));
OverlayItem overlayitem = new OverlayItem(point, "holda, Mundo!", "I'm in Mexico City~!");
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
}

You need to a) use only a single HelloItemizedOverlay (instead one for each point) and b) add this overlay to the map before you add the markers (In your current code, the overlay is not yet associated with the map when populate is called, so the map does not receive any notification and doesn't refresh itself).
Some things to check:
Did you specify your api key for the MapView? *
*) How to specify your api key (in the layout resource for your activity):
<com.google.android.maps.MapView android:id="#+id/map"
...
android:apiKey="your-api-key-here"/>

Starting a new activity from a subclass with a listener

In order to detect map movements and gestures and use the lazy loading support for my map items I'm trying to work with this library: http://code.google.com/p/mapview-overlay-manager/.
I've setup a map attached the overlayManager and the events are coming through just fine. I can throw a toast from the listener just fine. When I get Application context it is not null.
I'm stuck trying to launch an intent from the ManagedOverlay class. Specifically in the onDoubleTap method below I'm trying to launch an intent and I get this error message:
Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
I think I generally understand that I need to call back to the MapActivity subclass and have it launch the intent or I need to do something with the context differently. I'm having trouble ironing out the specifics however. Any assistance appreciated.
public class SiteMapRev2 extends MapActivity {
private MapView mapView;
private OverlayManager overlayManager;
private MapController mapController;
private MyLocationOverlay userLocationOverlay;
private ArrayList<SiteSummary> sitesRoster = null;
private Drawable siteIcon;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
overlayManager = new OverlayManager(this, mapView);
sitesRoster = new ArrayList<SiteSummary>();
userLocationOverlay = new MyLocationOverlay(this, mapView);
mapView.getOverlays().add(userLocationOverlay);
mapController = mapView.getController();
mapController.setZoom(14);
siteIcon = this.getResources().getDrawable(R.drawable.marker2);
}
#Override
public void onStart() {
super.onStart();
Drawable defaultmarker = getResources().getDrawable(R.drawable.marker2);
ManagedOverlay managedOverlay = overlayManager.createOverlay("sites", defaultmarker);
managedOverlay.setOnOverlayGestureListener(new ManagedOverlayGestureDetector.OnOverlayGestureListener(){
public boolean onDoubleTap(MotionEvent arg0, ManagedOverlay arg1,
GeoPoint arg2, ManagedOverlayItem arg3) {
if (arg3 == null) {
return false;
}
else {
**SiteOverlayItem thisItem = (SiteOverlayItem) arg3;
String siteIDAsString = Integer.toString(thisItem.getSiteID());
Context c = getApplicationContext();
Intent showSiteDetails = new Intent(c,SiteDetailActivity.class);
Log.d(toString(), "intent = " + showSiteDetails.toString());
showSiteDetails.setData(Uri.parse(siteIDAsString));
c.startActivity(showSiteDetails);
return true;**
}
}

Instead of getting the application context, I would do this:
SiteMapRev2.this.startActivity(showSiteDetails);
which starts the activity from your map activity as you normally would.

Set this Flag to your intent, Logcat is too smart, try to understand what is says to you ;)
showSiteDetails.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

Inflate balloon when item is selected

I have a map activity that has many pins of map, and when I click a pin, a custom balloon opens, showing some information about that pin. Also, I have a search bar, where if you type the name of a knob, the info appears there, but I want it to go to that searched pin.
Example: on the map you have different vegetables pins, and when you search carrot, the search list will show the element carrot, and when you click on it, the balloon for the carrot pin will inflate. So, my question is : is there some sort of OnTap() void method ? I know, that OnTap(int index) returns a boolean.

create your own itemized overlay, and override the onTap method, and in your main class, make an instance of the itemized overlay, and call overlay.onTap(point)
Sample code:
public class MyItemizedOverlay<Item> extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> m_overlays;
private MapView mapView;
final MapController mc;
public MyItemizedOverlay(Drawable defaultMarker, MapView mapView) {
super(boundCenterBottom(defaultMarker), mapView);
m_overlays = new ArrayList<OverlayItem>();
mc = mapView.getController();
populate();
}
public void addOverlay(OverlayItem overlay) {
m_overlays.add(overlay);
setLastFocusedIndex(-1);
populate();
}
public ArrayList<OverlayItem> getOverlays() {
return m_overlays;
}
public final boolean onTap(int index) {
GeoPoint point;
point = createItem(index).getPoint();
mc.animateTo(point);
return true;
}
...
}
In the main class
public class Main extends MapActivity {
private MapView mapView;
private List<Overlay> mapOverlays;
private MyItemizedOverlay overlay;
private Drawable pin;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
doAction();
}
private void doAction() {
mapView = (MapView)findViewById(R.id.map_view);
pin = res.getDrawable(R.drawable.pin);
overlay = new MyItemizedOverlay(pin, mapView);
GeoPoint point = new GeoPoint((int)(7*1E6),(int)(42*1E6));
overlayItem = new OverlayItem(point, "title", "text");
overlay.addOverlay(overlayItem);
mapOverlays = mapView.getOverlays();
mapOverlays.add(overlay);
//we tap the point here
overlay.onTap(0);
}
}

Android MapView

I'm trying to add an overlay for myLocation in Android. The map displays, but the overlay does not. I did get the overlay to appear using a separate class that extends ItemizedOverlay. I'm wondering of there is a way to display this individual point without creating a separate class?
Attached is the source code for the activity class.
public class WalkAbout extends MapActivity {
//for Hello_mapview
List<Overlay> mapOverlays;
Drawable drawable;
private MapView m_vwMap;
private MapController m_mapController;
private PathOverlay m_pathOverlay;
private MyLocationOverlay m_locationOverlay;
private ArrayList<GeoPoint> m_arrPathPoints;
private ArrayList<OverlayItem> m_arrPicturePoints;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initLocationData();
initLayout();
}
#Override
protected boolean isRouteDisplayed() {
return false;
}
private void initLocationData() {
// TODO
}
private void initLayout() {
//instantiate XML File into corresponding view objects.
//Then inflate new view from XML resource.
setContentView(R.layout.map_layout);
MapView m_vwMap = (MapView)findViewById(R.id.mapview);
m_vwMap.setBuiltInZoomControls(true);
m_vwMap.setSatellite(true);
//retrieve list of overlay objects
mapOverlays=m_vwMap.getOverlays();
//set market for overlays
drawable=this.getResources().getDrawable(R.drawable.item);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight());
//create OverlayItem with my location
m_locationOverlay= new MyLocationOverlay(this, m_vwMap);
//enable market to set location and direction
m_locationOverlay.enableCompass();
m_locationOverlay.enableMyLocation();
mapOverlays.add(m_locationOverlay);
}
}

You need to call invalidate() on your m_vwMap so it will redraw itself.