Android的图形页面坐标x屏幕位置 [英] Android MapView coordinates x screen position

问题描述

我开发了需要处理MapView类Android应用程序。我基本上需要做的就是要摆正屏幕PIN码的中心，这将是比使用相对布局的MapView。用户可以根据他的意愿移动地图。移动地图和定位PIN码后，我需要从这一立场得到协调（纬度和经度）。

I am developing an android application which needs to handle mapview. What I basically need to do is to put right on the center of the screen a PIN, which will be over the mapview using relative layout. The user can move the map according to his will. After moving the map and positioning the PIN, I need to get the coordinated (lat and lng) from that position.

有基本上类似于该用户可以请求一个驾驶室中的应用。
UberCab

It is basically similar to the application that the user can request a cab. UberCab

第三段说：固定栓下的地图和[使用]整个地图例如，作为该公司的博客文章解释说，当你订购的车，你可以通过移动设置拿起位置精确地设置您的位置。在Android应用程序的信息面板有一个干净的透明性让您专注在地图上，并在你的方向。

The third paragraph says: "For example, as explained on the company’s blog post, when you are ordering a car you can set the pick up location by moving "the map under the stationary pin and [using] the entire map to set your location accurately. The information panels on the Android app have a clean transparency that allows you to focus on the map, and where you’re headed."

我的布局将是这个样子：

My layout will be this way:

    <RelativeLayout android:id="@+id/mapviewContainer" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:layout_below="@+id/tvCurrentAddress">   

    <ImageView android:id="@+id/pin_image_view" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:src="@drawable/pin_red" 
        android:layout_centerInParent="true" />  

    <com.google.android.maps.MapView android:id="@+id/mapview" 
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" 
        android:clickable="true"            
        android:apiKey="@string/mapKey" />          

</RelativeLayout>

我想实现同样的事情。有谁知道如何实现这一目标？

I would like to achieve the same thing. Does anyone know how to achieve this?

感谢您的关注。

T

推荐答案

您不会与一个RelativeLayout的事情。 //$c$c.google.com/android/add-ons/google-apis/reference/index：引脚和基本上什么在链接到地理坐标绘制的MapView类是使用的叠加或更常见的的 ItemizedOverlay 。

You would not do with with a RelativeLayout. Pins and basically anything drawn on a MapView that is linked to geo coordinates is drawn using an Overlay or more commonly an ItemizedOverlay.

虽然回答您的主要问题。您可以通过一个类似的系统转换坐标像素坐标：

Though to answer your main question. You can convert coordinates to pixel coordinates by a system similar to this:

GeoPoint location;
-- get the location someway like through the onTap method -- 
Point screenPoint = new Point();
mapView.getProjection().toPixels(location, screenPoint);

现在screenPoint将有GeoPoint对象的像素坐标。

Now screenPoint will have the pixel coordinates of the GeoPoint.

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