音量键+谷歌地图V2 [英] Volume Keys + Google maps V2

问题描述

有谁知道如何使android上的谷歌地图V2通过点击音量键来放大/缩小？

Does anyone knows how to make a google maps V2 on android to zoom in/out by clicking on the Volume keys?

我用这个code，但它不工作：

I use this code but it does not work :

     @Override
    public boolean dispatchKeyEvent(KeyEvent event)
    {
        if (mUseVolumeKeys)
        {
            int action = event.getAction();
            int keyCode = event.getKeyCode();
            switch (keyCode)
            {
                case KeyEvent.KEYCODE_VOLUME_UP:
                    if (action == KeyEvent.ACTION_UP)
                    {
                        if (mMap != null)
                        {
                            mMap.zoomIn();
                        }
                    }
                    return true;
                case KeyEvent.KEYCODE_VOLUME_DOWN:
                    if (action == KeyEvent.ACTION_DOWN)
                    {
                        if (mMap != null)
                        {
                            mMap.zoomOut();
                        }
                    }
                    return true;
            }
        }

我对Mmap.zoomIn /出一个错误，指出
     该方法zoomIn（）是未定义的类型的GoogleMap

I have an error on the Mmap.zoomIn / out that says The method zoomIn() is undefined for the type GoogleMap

谢谢！

推荐答案

有没有 zoomIn（）在地图上V2方法。

There is no zoomIn() method on Maps V2.

如果你想放大，获得通过当前的相机位置 getCameraPosition（），更新其缩放，和然后用 moveCamera（）或 animateCamera（）更改为修改后的 CameraPosition 。

If you want to zoom, get the current camera position via getCameraPosition(), update its zoom, and then use moveCamera() or animateCamera() to change to your revised CameraPosition.

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