java - 缩放 android 时禁用 Mapview 滚动

Question

Google Map android 是否有类似于 iOS GoogleMap.settings.allowScrollGesturesDuringRotateOrZoom 的选项？

基本上我想要实现的是将标记的相对布局保持在 map 中心。

Answer 1

您可以引用这个thread 。尽管由于 ScaleGestureDetector 错误，它仅适用于 API > 16。使用常规 Mapview 并在 API <= 16 和 API > 16 上启用缩放手势。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);
        }
    }
}

另外，这里有一个可能有帮助的相关线程:MapView - Disable dragging around, but allow zooming