GoogleMap.OnCameraChangeListener onCameraChange works with delays

问题

I need to listen CameraPosition changes to draw a custom compass. The problem that: GoogleMap.OnCameraChangeListener onCameraChange

• this listener may not be notified of intermediate camera positions.
• it fires with random delays (can not understand why)

Is there are any way to listen to CameraPosition bearing changes? (In ios f.e. it's possible to achieve using Key-Value Observing), reflection...? Thanks.

回答1:

Put FrameLayout above map and catch touches:

@Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (mCatchTouchFrameLayoutListener != null)
            mCatchTouchFrameLayoutListener.onTouch(ev);
        return false;
    }

回答2:

To move the camera instantly with the given CameraUpdate, you can call GoogleMap.moveCamera(CameraUpdate).

You can make the user experience more pleasing, especially for short moves, by animating the change. To do this instead of calling GoogleMap.moveCamera() call GoogleMap.animateCamera(). The map will move smoothly to the new attributes. The most detailed form of this method, GoogleMap.animateCamera(cameraUpdate, duration, callback), offers three arguments:

CameraUpdate: The CameraUpdate describing where to move the camera.

Callback: An object that implements GoogleMap.CancellableCallback. This generalized interface for handling tasks defines two methods onCancel() and onFinished(). For animation, the methods are called in the following circumstances: onFinish() Invoked if the animation goes to completion without interruption. onCancel() Invoked if the animation is interrupted by calling stopAnimation() or starting a new camera movement. Alternatively, this can also occur if you call GoogleMap.stopAnimation().

Duration: Desired duration of the animation, in milliseconds, as an int.

来源：https://stackoverflow.com/questions/28819522/googlemap-oncamerachangelistener-oncamerachange-works-with-delays