枪王放大的GoogleMaps活动 [英] Double Tap Zoom in GoogleMaps Activity

问题描述

  

可能重复：
  枪王 - ＆GT;变焦Android上的MapView？

我是新手的Andr​​oid开发者。我正在开发中，我使用谷歌地图的应用程序。我要实现双击放大的GoogleMaps。当我双击在地图上应该放大。请，如果有可能提供样本code。
我写了下面的code，但我不知道该怎么添加更多。

 公共类地图扩展MapActivity实现OnGestureListener，OnDoubleTapListener {

    私人GestureDetector检测器;

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;
        //服务器MapViewer MapViewer的=新的MapViewer（NULL，NULL）;
        图形页面图形页面=（图形页面）findViewById（R.id.mapview）;
        探测器=新GestureDetector（这一点，这一点）;
        mapView.setBuiltInZoomControls（真正的）;
    }

    @覆盖
    保护的布尔isRouteDisplayed（）{
        返回false;
    }

    公共布尔onDoubleTap（MotionEvent E）{
        。mapView.getController（）zoomIn（）;
        返回false;
    }

    公共布尔onDoubleTapEvent（MotionEvent E）{
        返回false;
    }

    公共布尔onSingleTapConfirmed（MotionEvent E）{
        返回false;
    }

    公共布尔onDown（MotionEvent E）{
        返回false;
    }

    公共布尔onFling（MotionEvent E1，E2 MotionEvent，浮velocityX，浮velocityY）{
        返回false;
    }

    公共无效onLong preSS（MotionEvent E）{
    }

    公共布尔onScroll（MotionEvent E1，E2 MotionEvent，浮distanceX，浮distanceY）{
        返回false;
    }

    公共无效OnShow中preSS（MotionEvent E）{
    }

    公共布尔onSingleTapUp（MotionEvent E）{
        返回false;
    }
}
 

解决方案

根据这里的信息提供和<一href="http://stackoverflow.com/questions/4454456/double-click-tap-map-zoom-android/9918657#9918657">double点击/点击地图缩放（安卓）我得到了最好的解决办法是：

  myLocationOverlay =新MyLocationOverlay（本，图形页面）;

MyItemizedOverlay itemizedOverlay =新MyItemizedOverlay（）{
    专用长SYSTEMTIME = System.currentTimeMillis的（）;

    @覆盖
    公共布尔的onTouchEvent（MotionEvent事件，图形页面图形页面）{
        开关（event.getAction（））{
        案例MotionEvent.ACTION_DOWN：
            如果（（System.currentTimeMillis的（） -  SYSTEMTIME）所述; ViewConfiguration.getDoubleTapTimeout（））{
                mapController.zoomInFixing（（int）的event.getX（），（int）的event.getY（））;
            }
            打破;
        案例MotionEvent.ACTION_UP：
            SYSTEMTIME = System.currentTimeMillis的（）;
            打破;
        }

        返回false;
    }
};
 

情况下MotionEvent.ACTION_UP 加入作为如何<一个结果href="https://developer.android.com/reference/android/view/ViewConfiguration.html#getDoubleTapTimeout%28%29" rel="nofollow">https://developer.android.com/reference/android/view/ViewConfiguration.html#getDoubleTapTimeout()说 getDoubleTapTimeout（）将被计算。此外，我改变了变焦功能，因为这一个是最少的跳动和功能相同的地图应用程序。

Possible Duplicate:
Double Tap -> Zoom on Android MapView?

I am newbie Android developer. I am developing an application in which I am using GoogleMaps. I have to implement double tap zoom in GoogleMaps. When I double click on the map it should zoom in. Kindly if it is possible provide a sample code.
I have written the following code but I dont know what to add more.

public class Maps extends MapActivity implements OnGestureListener, OnDoubleTapListener {

    private GestureDetector detector;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        // MapViewer mapViewer = new MapViewer(null, null);
        MapView mapView = (MapView) findViewById(R.id.mapview);
        detector = new GestureDetector(this, this);
        mapView.setBuiltInZoomControls(true);
    }

    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }

    public boolean onDoubleTap(MotionEvent e) {
        mapView.getController().zoomIn();
        return false;
    }

    public boolean onDoubleTapEvent(MotionEvent e) {
        return false;
    }

    public boolean onSingleTapConfirmed(MotionEvent e) {
        return false;
    }

    public boolean onDown(MotionEvent e) {
        return false;
    }

    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        return false;
    }

    public void onLongPress(MotionEvent e) {
    }

    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        return false;
    }

    public void onShowPress(MotionEvent e) {
    }

    public boolean onSingleTapUp(MotionEvent e) {
        return false;
    }
}

解决方案

Based on the information provided here and double click/tap map zoom (Android) the best solution I got was:

myLocationOverlay = new MyLocationOverlay(this, mapView);

MyItemizedOverlay itemizedOverlay = new MyItemizedOverlay() {
    private long systemTime = System.currentTimeMillis();

    @Override
    public boolean onTouchEvent(MotionEvent event, MapView mapView) {
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            if ((System.currentTimeMillis() - systemTime) < ViewConfiguration.getDoubleTapTimeout()) {
                mapController.zoomInFixing((int) event.getX(), (int) event.getY());
            }
            break;
        case MotionEvent.ACTION_UP:
            systemTime = System.currentTimeMillis();
            break;
        }

        return false;
    }
};

case MotionEvent.ACTION_UP was added as a result of how https://developer.android.com/reference/android/view/ViewConfiguration.html#getDoubleTapTimeout() says getDoubleTapTimeout() is to be calculated. Additionally I changed the zoom function as this one is the least jumpy and functions identical to the Maps app.

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