RotationGestureOverlay.java

package org.osmdroid.views.overlay.gestures;

import org.osmdroid.views.MapView;
import org.osmdroid.views.overlay.IOverlayMenuProvider;
import org.osmdroid.views.overlay.Overlay;

import android.content.Context;
import android.graphics.Canvas;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;

public class RotationGestureOverlay extends Overlay implements
        RotationGestureDetector.RotationListener, IOverlayMenuProvider
{
	private final static boolean SHOW_ROTATE_MENU_ITEMS = false;

	private final static int MENU_ENABLED = getSafeMenuId();
	private final static int MENU_ROTATE_CCW = getSafeMenuId();
	private final static int MENU_ROTATE_CW = getSafeMenuId();

    private final RotationGestureDetector mRotationDetector;
    private MapView mMapView;
    private boolean mOptionsMenuEnabled = true;

    /** use {@link #RotationGestureOverlay(MapView)} instead. */
    @Deprecated
    public RotationGestureOverlay(Context context, MapView mapView) {
        this(mapView);
    }
    public RotationGestureOverlay(MapView mapView)
    {
        super();
        mMapView = mapView;
        mRotationDetector = new RotationGestureDetector(this);
    }

    @Override
	public void draw(Canvas c, MapView osmv, boolean shadow) {
        // No drawing necessary
    }

    @Override
    public boolean onTouchEvent(MotionEvent event, MapView mapView)
    {
        if (this.isEnabled()) {
            mRotationDetector.onTouch(event);
        }
        return super.onTouchEvent(event, mapView);
    }
    long timeLastSet=0L;
    final long deltaTime=25L;
    float currentAngle=0f;

    @Override
    public void onRotate(float deltaAngle)
    {
        currentAngle+=deltaAngle;
        if (System.currentTimeMillis() - deltaTime > timeLastSet){
            timeLastSet = System.currentTimeMillis();
            mMapView.setMapOrientation(mMapView.getMapOrientation() + currentAngle);
        }
    }

    @Override
    public void onDetach(MapView map){
        mMapView=null;
    }

    @Override
    public boolean isOptionsMenuEnabled()
    {
        return mOptionsMenuEnabled;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu pMenu, int pMenuIdOffset, MapView pMapView)
    {
		pMenu.add(0, MENU_ENABLED + pMenuIdOffset, Menu.NONE, "Enable rotation").setIcon(
				android.R.drawable.ic_menu_info_details);
		if (SHOW_ROTATE_MENU_ITEMS) {
			pMenu.add(0, MENU_ROTATE_CCW + pMenuIdOffset, Menu.NONE,
					"Rotate maps counter clockwise").setIcon(android.R.drawable.ic_menu_rotate);
			pMenu.add(0, MENU_ROTATE_CW + pMenuIdOffset, Menu.NONE, "Rotate maps clockwise")
					.setIcon(android.R.drawable.ic_menu_rotate);
		}
        return true;
    }

	@Override
	public boolean onOptionsItemSelected(MenuItem pItem, int pMenuIdOffset, MapView pMapView)
	{
		if (pItem.getItemId() == MENU_ENABLED + pMenuIdOffset) {
			if (this.isEnabled()) {
				mMapView.setMapOrientation(0);
				this.setEnabled(false);
			} else {
				this.setEnabled(true);
				return true;
			}
		} else if (pItem.getItemId() == MENU_ROTATE_CCW + pMenuIdOffset) {
			mMapView.setMapOrientation(mMapView.getMapOrientation() - 10);
		} else if (pItem.getItemId() == MENU_ROTATE_CW + pMenuIdOffset) {
			mMapView.setMapOrientation(mMapView.getMapOrientation() + 10);
		}

		return false;
	}

    @Override
    public boolean onPrepareOptionsMenu(final Menu pMenu, final int pMenuIdOffset, final MapView pMapView)
    {
        pMenu.findItem(MENU_ENABLED + pMenuIdOffset).setTitle(
                this.isEnabled() ? "Disable rotation" : "Enable rotation");
        return false;
    }

    @Override
    public void setOptionsMenuEnabled(boolean enabled)
    {
        mOptionsMenuEnabled = enabled;
    }
}