android mapping using osmDroid mapping api

问题:

I want to develope android mapping app using osmDroid mapping api with offline and online capabilites, but I couldn't find many tutorials about it, so If any one have any link to tutorials that use osmdroid mapping api offline or online. I have write a small app just to display the map from the default provider but, the application run but no map is displayed (only squers) what is wrong?? the code:

MapView map = new MapView(this, 256);
    map.setClickable(true);
    map.setBuiltInZoomControls(true);
    setContentView(map);

the controls are displayed!!!!!!

回答1:

Or maybe missing the INTERNET (or another) permission in the manifest file?

HowToUseJar

回答2:

It's probably missing a tile source. Below is the smallest sample of code I have that will show you an OSM map using osmdroid:

import org.osmdroid.tileprovider.tilesource.TileSourceFactory;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapController;
import org.osmdroid.views.MapView;
import android.app.Activity;
import android.os.Bundle;

// This is all you need to display an OSM map using osmdroid
public class OsmdroidDemoMap extends Activity {

    private MapView         mMapView;
    private MapController   mMapController;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
            setContentView(R.layout.osm_main);
        mMapView = (MapView) findViewById(R.id.mapview);
        mMapView.setTileSource(TileSourceFactory.MAPNIK);
        mMapView.setBuiltInZoomControls(true);
        mMapController = mMapView.getController();
        mMapController.setZoom(13);
        GeoPoint gPt = new GeoPoint(51500000, -150000);
        //Centre map near to Hyde Park Corner, London
        mMapController.setCenter(gPt);

    }
}
/* HAVE THIS AS YOUR osm_main.xml
---------------------------------------------------------- XML START
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <org.osmdroid.views.MapView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"
        android:id="@+id/mapview"
        ></org.osmdroid.views.MapView>
</LinearLayout>
---------------------------------------------------------- XML END
Include slf4j-android-1.5.8.jar and osmdroid-android-3.0.5.jar in the build path
(Google search for where to get them from)
*/

回答3:

You also need to add

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

to your manifest. Osmdroid tries to cache the tiles and fails when there is no storage access.