Android：使用KML文件和地理位置檢測國家

Question

我有一個KML文件，列出了每個國家的多邊形座標。我有一個經緯度對，我想檢查這個位置在哪個國家。我想以最有效的方式做到這一點。

我認爲解析KML文件並逐個搜索將是一個痛苦的用戶，所以我假設我應該能夠存儲這些國家和他們的離線座標（我希望我的應用程序脫機工作）數據庫這樣我就不必每次啓動我的Android應用程序就解析KML文件。

我有兩個問題：

1. 什麼是存儲爲快速方便地訪問這些座標的好辦法？
2. 關於數字1，確定位置所在的國家有什麼好的方法或算法？我在Google上找到了一些算法來確定點是否在多邊形中，但我想知道是否有更簡單的方法。

下面是KML文件是如何爲一個國家舉辦了一個例子：

<Placemark> 
       <name>Ukraine</name> 
       <description><![CDATA[<table><tr><td><FeatureID>194</FeatureID></td><td> 
<GMI_CNTRY>UKR</GMI_CNTRY></td><td> 
<REGION>Europe</REGION></td></tr><tr><td colspan=3> 
<a href="http://www.imageshack.us"><img src="http://img317.imageshack.us/img317/3765/ukraine4gw.jpg" border="0" width="250" alt="Image Hosted by ImageShack.us" /></a><br><a href="https://www.cia.gov/library/publications/the-world-factbook/geos//up.html">CIA World Factbook: UP</a></td></tr></table>]]></description> 
       <Style> 
        <PolyStyle> 
         <color>aaffffff</color> 
         <colorMode>random</colorMode> 
        </PolyStyle> 
       </Style> 
       <Polygon> 
        <outerBoundaryIs> 
         <LinearRing> 
          <coordinates> 
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Answer 1

我想保存這些座標的最佳方式是創建一個非常簡單的類具有隻是每個國家一個2D float標籤（第一d爲GeoPoint的數目，所述第二d的大小爲2，並且包含LAT或長）

隨着你座標列表，可以創建的Region列表（使用Path和Region.setPath(Path, Region)）和呼叫Region.contain(X, Y)如果X，Y點位於您的國家內部，則會出現問題。

Answer 2

2。預先計算每個國家的邊界​​框。當一個位置在邊界框內時，然後加載該國家的多邊形並執行更準確的測試。你只需要加載和檢查幾個多邊形。您甚至可以從KML文件按需加載多邊形。