onTap如何在android地图视图中工作

Question

即使地图视图被移动，onTap侦听器在android地图视图中的工作方式。实际上，我是在根据用户方向旋转地图视图。

我从赛索经理那里得到方位角。

如果角度为0，onTap在引脚上正常工作。如果角度发生变化，比如说20 onTap不完全在引脚上工作，它会在引脚旁边工作一段时间。

我在拍摄地图视图的内部拍摄了旋转视图。现在我在轴承改变后旋转旋转视图。

RotateView设置轴承代码

 @Override
    protected void dispatchDraw(Canvas canvas) {
        canvas.save(Canvas.MATRIX_SAVE_FLAG);
    //if mHeading is zero its work otherwise onTap position is changing 
        canvas.rotate(mHeading, getWidth()/2, getHeight());
        mCanvas.delegate = canvas;
        super.dispatchDraw(mCanvas);
        canvas.restore();
    }

叠加类

public class SonarOverlay1 extends ItemizedOverlay<OverlayItem>
{
    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
    private Context mContext;
public SonarOverlay1(Drawable defaultMarker,Context context) {
    super(boundCenter(defaultMarker));
    this.mContext=context;
    populate();
}
@Override
protected OverlayItem createItem(int arg0) {
    return  mOverlays.get(arg0);
}
public void addOverlay(OverlayItem item) {
    mOverlays.add(item);
    populate();
}
@Override
public int size() {
//Log.e("overlay size..",""+mOverlays.size());
    return mOverlays.size();
}

@Override
protected boolean onTap(int index) {
    // TODO Auto-generated method stub
      OverlayItem item = mOverlays.get(index);
      AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
      dialog.setTitle(item.getTitle());
      dialog.setMessage(item.getSnippet());
      dialog.show();
      return true;
}
}

Answer 1

在旋转地图时，我们必须使用onDispatchTouch方法将触摸evnts与地图一起旋转

参见以下代码

@Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        float[] coords = new float[] {
                event.getX(), event.getY()
        };
        adjustCoords(coords, getRotation());
        MotionEvent evt = MotionEvent.obtain(event.getDownTime(), event.getEventTime(), event
                .getAction(), coords[0], coords[1], event.getPressure(), event.getSize(), event
                .getMetaState(), event.getXPrecision(), event.getYPrecision(), event.getDeviceId(),
                event.getEdgeFlags());
        return super.dispatchTouchEvent(evt);
    }
    protected void adjustCoords(float[] coords, float deg) {
        float x = coords[0];
        float y = coords[1];
        int centerX = getWidth() / 2;
        int centerY = getHeight() / 2;
        // convert to radians
        float rad = (float) ((deg * Math.PI) / 180F);
        float s = (float) Math.sin(rad);
        float c = (float) Math.cos(rad);
        // translate point back to origin:
        x -= centerX;
        y -= centerY;
        // apply rotation
        float tmpX = x * c - y * s;
        float tmpY = x * s + y * c;
        x = tmpX;
        y = tmpY;
        // translate point back:
        x += centerX;
        y += centerY;
        coords[0] = x;
        coords[1] = y;
    }

请参阅以下链接

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