我正在尝试运行mapsfage项目中最简单的地图查看器示例：一个非常基本的Android应用程序示例-带有Android Studio的GitHub
在应用程序运行过程中，我遇到了一个问题——映射没有呈现：https://i.stack.imgur.com/bVNUZ.jpg
我的日志中有一条消息：
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（几乎没有更改，与原始代码相比只有必要的更改）：
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>
我想我也添加了所有必需的。jar-s:
mapsfordge-core-0.6.0.jar，
mapsfordge-map-0.6.0.jar，
mapsford地图android，
mapsfoge-map-awt-0.6.0.jar，
mapsfoge-map-reader-0.6.0.jar
我还需要添加其他库吗？
根据logcat的mesage和我读到的内容，默认地图主题有问题，我该如何解决这个问题？
Cichocki，它也发生在我身上，让我们开始是的，它在库映射0.6中缺少那个类，那个和其他的，你需要下载这个源代码，它是一个库svg：https://github.com/senkir/androidsvg下载该repo，导入到您的工作区并添加到您的项目中我在eclipse中完成了它，添加为库，然后运行该代码。不需要添加任何额外的内容，您应该会看到地图，祝好运
您应该通过将主题库添加到build.gradle或使用等效的jar:来添加主题库
implementation 'org.mapsforge:mapsforge-themes:[CURRENT-VERSION]'
有关更多信息，请参阅集成指南。
根据集成指南，您需要额外导入：
implementation 'com.caverock:androidsvg:1.4'