我想添加一個路徑覆蓋到OSMDroid地圖,它不出現。我錯過了什麼?OSMDroid PathOverlay沒有出現
更新:
我想通了,它是與瓷磚的大小。即使拼貼是256,我也將尺寸設置爲512,否則地圖太小而無法在高像素密度屏幕上讀取。如果我將大小更改爲256,則顯示路徑。如果我將其更改回512,則不會顯示。
public class MainActivity extends Activity {
// set this to 256 for actual tile size, 512 to show larger and cause PathOverlay to not be displayed
int tileSize = 512;
private MapView mapView;
// area of offline tiles
double north = 40.739063;
double south = 40.708361;
double west = -73.967171;
double east = -73.936272;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// center of offline tiles
double centerlat = (double) ((north+south)/2);
double centerlon = (double) ((west+east)/2);
// copy tiles to sd location for offline map
putMapOnSD();
// create mapView and show layout
mapView = new MapView(this,tileSize);
final LinearLayout layout = new LinearLayout(this);
final LinearLayout.LayoutParams mapViewLayoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT);
layout.addView(mapView, mapViewLayoutParams);
setContentView(layout);
// set map to use offline tiles and display
mapView.setTileSource (new XYTileSource ("tiles", ResourceProxy.string.offline_mode, 13, 17, tileSize, ".png", "http://127.0.0.1"));
mapView.setUseDataConnection(false);
mapView.setClickable(false);
mapView.setMultiTouchControls(true);
mapView.setBuiltInZoomControls(false);
mapView.getController().setZoom(15);
mapView.getController().setCenter(new GeoPoint(centerlat,centerlon));
// show pathOverlay
PathOverlay pathOverlay = new PathOverlay(Color.RED, this);
pathOverlay.addPoint(new GeoPoint(centerlat,centerlon));
centerlat += 0.005;
pathOverlay.addPoint(new GeoPoint(centerlat,centerlon));
centerlon += 0.005;
pathOverlay.addPoint(new GeoPoint(centerlat,centerlon));
pathOverlay.getPaint().setStrokeWidth(10.0f);
mapView.getOverlays().add(pathOverlay);
// refresh map, is this needed?
mapView.invalidate();
}
// this copies the offline tiles to the proper location for OSMDroid to use them offline
private void putMapOnSD() {
// see GitHub for this
}
}
在GitHub上獲取完整的項目。 https://github.com/tomkincaid/PathExample
我使用Cloudmade的@ 2x圖塊解決了這個問題,所以我不必爲高密度屏幕使用512像素大小。儘管有人想調查,但基本問題仍然存在。
如果較大的瓷磚尺寸couse路徑覆蓋不令人滿意,您可能必須發揮您的地理座標增加其他任何差異或大小:)一旦這對我工作:) – ismail