Sie können sich darauf beziehen thread. Obwohl wegen ScaleGestureDetector
Fehler wird es nur API arbeiten> 16. Die regelmäßige Anwendung Mapview
mit Skala Gesten aktiviert auf API < = 16 und API> 16. Reference.
public class CustomEventMapView extends MapView {
private int fingers = 0;
private GoogleMap googleMap;
private long lastZoomTime = 0;
private float lastSpan = -1;
private Handler handler = new Handler();
private ScaleGestureDetector gestureDetector;
public CustomEventMapView(Context context, GoogleMapOptions options) {
super(context, options);
}
public CustomEventMapView(Context context) {
super(context);
}
@Override
public void getMapAsync(final OnMapReadyCallback callback) {
super.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(final GoogleMap googleMap) {
gestureDetector = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.OnScaleGestureListener() {
@Override
public boolean onScale(ScaleGestureDetector detector) {
if (lastSpan == -1) {
lastSpan = detector.getCurrentSpan();
} else if (detector.getEventTime() - lastZoomTime >= 50) {
lastZoomTime = detector.getEventTime();
googleMap.animateCamera(CameraUpdateFactory.zoomBy(getZoomValue(detector.getCurrentSpan(), lastSpan)), 50, null);
lastSpan = detector.getCurrentSpan();
}
return false;
}
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
lastSpan = -1;
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {
lastSpan = -1;
}
});
CustomEventMapView.this.googleMap = googleMap;
callback.onMapReady(googleMap);
}
});
}
private float getZoomValue(float currentSpan, float lastSpan) {
double value = (Math.log(currentSpan/lastSpan)/Math.log(1.55d));
return (float) value;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
switch (ev.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_POINTER_DOWN:
fingers = fingers + 1;
break;
case MotionEvent.ACTION_POINTER_UP:
fingers = fingers - 1;
break;
case MotionEvent.ACTION_UP:
fingers = 0;
break;
case MotionEvent.ACTION_DOWN:
fingers = 1;
break;
}
if (fingers > 1) {
disableScrolling();
} else if (fingers < 1) {
enableScrolling();
}
if (fingers > 1) {
return gestureDetector.onTouchEvent(ev);
} else {
return super.dispatchTouchEvent(ev);
}
}
private void enableScrolling() {
if (googleMap != null && !googleMap.getUiSettings().isScrollGesturesEnabled()) {
handler.postDelayed(new Runnable() {
@Override
public void run() {
googleMap.getUiSettings().setAllGesturesEnabled(true);
}
}, 50);
}
}
private void disableScrolling() {
handler.removeCallbacksAndMessages(null);
if (googleMap != null && googleMap.getUiSettings().isScrollGesturesEnabled()) {
googleMap.getUiSettings().setAllGesturesEnabled(false);
}
}
}
Auch ist hier ein verwandtes Threads, helfen könnten: MapView - Disable dragging around, but allow zooming
Bitte markieren Sie diese Funktion, um Google mitzuteilen, dass wir es brauchen: https://issuetracker.google.com/issues/69795937 – dan