android cartes: Comment Long Cliquez sur une Carte?

Meilleur moyen que je connaisse pour ce faire est d'utiliser l'open source mapview-overlay-manager et l'utilisation de son geste auditeur qui fournit un rappel pour

public void onLongPress(MotionEvent e, ManagedOverlay overlay)

Cela fonctionne avec votre MapActivity et vous permettra de:

1. Définir votre propre seuil de temps de ce qui constitue un appui long sur la carte (de 0,8
   secondes est bon pour moi).
2. Pas interpréter un parchemin, multi-touch, ou non multi-touch de l'événement comme une pression longue. Il vous permet aussi de définir une tolérance de quelqu'un du doigt
   à jamais si légèrement déplacer sur l'écran, comme ils sont maintenant une pression longue.

Cette solution est basée sur Roger Kristiansen la solution. J'ai ajouté des points x et y de détection, de sorte que le défilement n'est pas considéré comme un travail de la presse. Cette solution n'est pas aussi élégant que Roger est parce que je utiliser de variables de classe et de mettre le code dans mon MapActivity au lieu de l'étendre à MapView et la création d'un auditeur comme il l'a fait. Mais si vous voulez coller avec son code, mais ont mieux non-support multi-touch, il suffit de prendre x et y du point des choses de la mine et de l'ajouter à son.

Variables de classe en haut de mon MapActivity:

//variable for determining long press and then automatically adding a pin to the map
private int minMillisecondThresholdForLongClick = 800;
private long startTimeForLongClick = 0;
private float xScreenCoordinateForLongClick;
private float yScreenCoordinateForLongClick;
private float xtolerance=10;//x pixels that your finger can be off but still constitute a long press
private float ytolerance=10;//y pixels that your finger can be off but still constitute a long press
private float xlow; //actual screen coordinate when you subtract the tolerance
private float xhigh; //actual screen coordinate when you add the tolerance
private float ylow; //actual screen coordinate when you subtract the tolerance
private float yhigh; //actual screen coordinate when you add the tolerance

Ajouter cette fonction dans votre MapActivity:

    @Override
public boolean dispatchTouchEvent(MotionEvent ev) {
/* We want to capture the place the user long pressed on the map and add a marker (pin) on the map at that lat/long.
* This solution:
*  1. Allows you to set the time threshold for what constitutes a long press
*  2. Doesn't get fooled by scrolling, multi-touch, or non-multi-touch events
* Thank you Roger Kind Kristiansen for the main idea
*/     
//get the action from the MotionEvent: down, move, or up
int actionType = ev.getAction();
if (actionType == MotionEvent.ACTION_DOWN) {
//user pressed the button down so let's initialize the main variables that we care about:
//later on when the "Action Up" event fires, the "DownTime" should match the "startTimeForLongClick" that we set here  
//the coordinate on the screen should not change much during the long press
startTimeForLongClick=ev.getEventTime();
xScreenCoordinateForLongClick=ev.getX();
yScreenCoordinateForLongClick=ev.getY();
} else if (actionType == MotionEvent.ACTION_MOVE) {
//For non-long press actions, the move action can happen a lot between ACTION_DOWN and ACTION_UP                    
if (ev.getPointerCount()>1) {
//easiest way to detect a multi-touch even is if the pointer count is greater than 1
//next thing to look at is if the x and y coordinates of the person's finger change.
startTimeForLongClick=0; //instead of a timer, just reset this class variable and in our ACTION_UP event, the DownTime value will not match and so we can reset.                        
} else {
//I know that I am getting to the same action as above, startTimeForLongClick=0, but I want the processor
//to quickly skip over this step if it detects the pointer count > 1 above
float xmove = ev.getX(); //where is their finger now?                   
float ymove = ev.getY();
//these next four values allow you set a tiny box around their finger in case
//they don't perfectly keep their finger still on a long click.
xlow = xScreenCoordinateForLongClick - xtolerance;
xhigh= xScreenCoordinateForLongClick + xtolerance;
ylow = yScreenCoordinateForLongClick - ytolerance;
yhigh= yScreenCoordinateForLongClick + ytolerance;
if ((xmove<xlow || xmove> xhigh) || (ymove<ylow || ymove> yhigh)){
//out of the range of an acceptable long press, reset the whole process
startTimeForLongClick=0;
}
}
} else if (actionType == MotionEvent.ACTION_UP) {
//determine if this was a long click:
long eventTime = ev.getEventTime();
long downTime = ev.getDownTime(); //this value will match the startTimeForLongClick variable as long as we didn't reset the startTimeForLongClick variable because we detected nonsense that invalidated a long press in the ACTION_MOVE block
//make sure the start time for the original "down event" is the same as this event's "downTime"
if (startTimeForLongClick==downTime){ 
//see if the event time minus the start time is within the threshold
if ((eventTime-startTimeForLongClick)>minMillisecondThresholdForLongClick){ 
//make sure we are at the same spot where we started the long click
float xup = ev.getX();                  
float yup = ev.getY();
//I don't want the overhead of a function call:
xlow = xScreenCoordinateForLongClick - xtolerance;
xhigh= xScreenCoordinateForLongClick + xtolerance;
ylow = yScreenCoordinateForLongClick - ytolerance;
yhigh= yScreenCoordinateForLongClick + ytolerance;
if ((xup>xlow && xup<xhigh) && (yup>ylow && yup<yhigh)){ 
//**** safe to process your code for an actual long press **** 
//comment out these next rows after you confirm in logcat that the long press works
long totaltime=eventTime-startTimeForLongClick;
String strtotaltime=Long.toString(totaltime);                               
Log.d("long press detected: ", strtotaltime);
/* 
//Now get the latitude/longitude of where you clicked.  Replace all the code below if you already know how to translate a screen coordinate to lat/long.  I know it works though.
//*****************
//I have my map under a tab so I have to account for the tab height and the notification bar at the top of the phone.  
//Maybe there are other ways so just ignore this if you already know how to get the lat/long of the pixels that were pressed.
int TabHeightAdjustmentPixels=tabHost.getTabWidget().getChildAt(0).getLayoutParams().height;
int EntireTabViewHeight = tabHost.getHeight();
Display display = getWindowManager().getDefaultDisplay(); 
int EntireScreenHeight = display.getHeight();
int NotificationBarHeight=EntireScreenHeight-EntireTabViewHeight;
//the projection is mapping pixels to where you touch on the screen.
Projection proj = mapView.getProjection();
GeoPoint loc = proj.fromPixels((int)(ev.getX(ev.getPointerCount()-1)), (int)(ev.getY(ev.getPointerCount()-1)-TabHeightAdjustmentPixels-NotificationBarHeight)); 
int longitude=loc.getLongitudeE6();             
int latitude=loc.getLatitudeE6();
//*****************
//**** here's where you add code to: 
//put a marker on the map, save the point to your SQLite database, etc
*/
}
}
}
}
return super.dispatchTouchEvent(ev);
}

ambrose,

J'ai modifié la démo de la bibliothèque mapview-overlay-manager. pour obtenir ce code en cours d'exécution avec un double tap geste:

package de.android1.overlaymanager.demo;
import android.os.Bundle;
import android.widget.Toast;
import android.graphics.drawable.Drawable;
import android.view.MotionEvent;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import com.google.android.maps.MapController;
import com.google.android.maps.GeoPoint;
import de.android1.overlaymanager.*;
public class DemoView extends MapActivity {
MapView mapView;
MapController mapController;
OverlayManager overlayManager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
mapController = mapView.getController();
overlayManager = new OverlayManager(getApplication(), mapView);
}
@Override
public void onWindowFocusChanged(boolean b) {
createOverlayWithListener();
}
public void createOverlayWithListener() {
//This time we use our own marker
final ManagedOverlay managedOverlay = overlayManager.createOverlay("listenerOverlay", getResources().getDrawable(R.drawable.marker));
for (int i = 0; i < 40; i = i + 3) {
managedOverlay.createItem(GeoHelper.geopoint[i], "Item" + i);
}
managedOverlay.setOnOverlayGestureListener(new ManagedOverlayGestureDetector.OnOverlayGestureListener() {
public boolean onZoom(ZoomEvent zoom, ManagedOverlay overlay) {
return false;
}
public boolean onDoubleTap(MotionEvent e, ManagedOverlay overlay, GeoPoint point, ManagedOverlayItem item) {
Drawable defaultmarker = getResources().getDrawable(R.drawable.marker);     
ManagedOverlay managedOverlay = overlayManager.createOverlay(defaultmarker);
//creating some marker:
managedOverlay.createItem(point);
//registers the ManagedOverlayer to the MapView
overlayManager.populate();
Toast.makeText(getApplicationContext(), "You created a Marker!", Toast.LENGTH_LONG).show();
return true;
}
public void onLongPress(MotionEvent arg0, ManagedOverlay arg1) {
//TODO Auto-generated method stub
}
public void onLongPressFinished(MotionEvent arg0,
ManagedOverlay arg1, GeoPoint arg2, ManagedOverlayItem arg3) {
//TODO Auto-generated method stub
}
public boolean onScrolled(MotionEvent arg0, MotionEvent arg1,
float arg2, float arg3, ManagedOverlay arg4) {
//TODO Auto-generated method stub
return false;
}
public boolean onSingleTap(MotionEvent arg0, ManagedOverlay arg1,
GeoPoint arg2, ManagedOverlayItem arg3) {
//TODO Auto-generated method stub
return false;
}           
});
overlayManager.populate();
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
}

Espère que cela aide.

Si vous allez avec le retard de post/message à un gestionnaire (une solution que j'utilise moi-même), il peut être utile de tester si la carte a été déplacé, c'est à dire si mapView.getMapCenter(), mapView.getLatitudeSpan() et mapView.getLongitudeSpan() retour le même que lorsque le pointeur est allé vers le bas.