我正在尝试运行 mapsforge 项目中最简单的地图查看器的示例：
一个非常基本的 Android 应用程序示例 -带有 Android Studio 的GitHub 。
在应用程序运行期间，我遇到了一个问题 - 地图未呈现：http://i.stack.imgur.com/bVNUZ.jpg我
的 logcat 有消息：
01-08 15:46:45.273 32331-32359/com.maptests.mapsforgetest E/DatabaseRenderer: Error to retrieve render theme from future
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: com.caverock.androidsvg.SVG
at java.util.concurrent.FutureTask.report(FutureTask.java:93)
at java.util.concurrent.FutureTask.get(FutureTask.java:163)
at org.mapsforge.map.layer.renderer.DatabaseRenderer.executeJob(DatabaseRenderer.java:124)
at org.mapsforge.map.layer.renderer.MapWorkerPool$MapWorker.run(MapWorkerPool.java:121)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.NoClassDefFoundError: com.caverock.androidsvg.SVG
at org.mapsforge.map.android.graphics.AndroidSvgBitmap.getResourceBitmap(AndroidSvgBitmap.java:49)
at org.mapsforge.map.android.graphics.AndroidSvgBitmap.<init>(AndroidSvgBitmap.java:107)
at org.mapsforge.map.android.graphics.AndroidGraphicFactory.renderSvg(AndroidGraphicFactory.java:302)
at org.mapsforge.map.rendertheme.XmlUtils.createBitmap(XmlUtils.java:64)
at org.mapsforge.map.rendertheme.renderinstruction.RenderInstruction.createBitmap(RenderInstruction.java:131)
at org.mapsforge.map.rendertheme.renderinstruction.Symbol.getBitmap(Symbol.java:62)
at org.mapsforge.map.rendertheme.renderinstruction.Caption.<init>(Caption.java:96)
at org.mapsforge.map.rendertheme.rule.RenderThemeHandler.startElement(RenderThemeHandler.java:186)
at org.mapsforge.map.rendertheme.rule.RenderThemeHandler.processRenderTheme(RenderThemeHandler.java:107)
at org.mapsforge.map.rendertheme.rule.RenderThemeHandler.getRenderTheme(RenderThemeHandler.java:67)
at org.mapsforge.map.rendertheme.rule.RenderThemeFuture$RenderThemeCallable.call(RenderThemeFuture.java:60)
at org.mapsforge.map.rendertheme.rule.RenderThemeFuture$RenderThemeCallable.call(RenderThemeFuture.java:43)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.lang.Thread.run(Thread.java:841)
主要活动代码（几乎没有变化，与原始代码相比只有基本变化）：
package com.maptests.mapsforgetest;
import java.io.File;
import org.mapsforge.core.model.LatLong;
import org.mapsforge.map.android.graphics.AndroidGraphicFactory;
import org.mapsforge.map.android.util.AndroidUtil;
import org.mapsforge.map.android.view.MapView;
import org.mapsforge.map.layer.cache.TileCache;
import org.mapsforge.map.layer.renderer.TileRendererLayer;
import org.mapsforge.map.datastore.MapDataStore;
import org.mapsforge.map.reader.MapFile;
import org.mapsforge.map.rendertheme.InternalRenderTheme;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Environment;
public class MainActivity extends AppCompatActivity {
// name of the map file in the external storage
private static final String MAPFILE = "germany.map";
private MapView mapView;
private TileCache tileCache;
private TileRendererLayer tileRendererLayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AndroidGraphicFactory.createInstance(this.getApplication());
this.mapView = new MapView(this);
setContentView(this.mapView);
this.mapView.setClickable(true);
this.mapView.getMapScaleBar().setVisible(true);
this.mapView.setBuiltInZoomControls(true);
this.mapView.getMapZoomControls().setZoomLevelMin((byte) 10);
this.mapView.getMapZoomControls().setZoomLevelMax((byte) 20);
// create a tile cache of suitable size
this.tileCache = AndroidUtil.createTileCache(this, "mapcache",
mapView.getModel().displayModel.getTileSize(), 1f,
this.mapView.getModel().frameBufferModel.getOverdrawFactor());
}
@Override
protected void onStart() {
super.onStart();
this.mapView.getModel().mapViewPosition.setCenter(new LatLong(52.229081, 21.068434));
this.mapView.getModel().mapViewPosition.setZoomLevel((byte) 12);
// tile renderer layer using internal render theme
MapDataStore mapDataStore = new MapFile(getMapFile());
this.tileRendererLayer = new TileRendererLayer(tileCache, mapDataStore,
this.mapView.getModel().mapViewPosition, false, true, AndroidGraphicFactory.INSTANCE);
tileRendererLayer.setXmlRenderTheme(InternalRenderTheme.OSMARENDER);
// only once a layer is associated with a mapView the rendering starts
this.mapView.getLayerManager().getLayers().add(tileRendererLayer);
}
@Override
protected void onDestroy() {
super.onDestroy();
this.mapView.destroyAll();
}
private File getMapFile() {
File file = new File(Environment.getExternalStorageDirectory(), MAPFILE);
return file;
}
}
还有我的 XML 设计文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.maptests.mapsforgetest.MainActivity">
<org.mapsforge.map.android.view.MapView
android:id="@+id/mapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</RelativeLayout>
我想我还添加了所有必需的 .jar-s：
mapsforge-core-0.6.0.jar、
mapsforge-map-0.6.0.jar、
mapsforge-map-android、
mapsforge-map-awt-0.6.0。 jar，
mapsforge-map-reader-0.6.0.jar。
还有其他我应该添加的库吗？
根据logcat的消息和我阅读的内容，默认地图主题有问题，我该如何解决这个问题？