android osmdroid 加载离线地图map格式以及地图网格绘制

2019-11-07 23:18:49

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越来越深入了解osmdroid开源地图，越发现强大。继上次记载离线地图文章之后android osmdroid 加载常用离线地图格式（开源的在线地图）。再讲支持map地图格式的数据。还有怎么绘制地图的网格，绘制网络分为两种，一种是直接在地图上绘制，监听缩放等级。还有一种是利用Fragment加一层进行绘制。

osmdroid 仓库地址：http://jcenter.bintray.com/org/osmdroid/osmdroid-android/ 这里面有示例apk，还有源码以及文档。

github官网：https://github.com/osmdroid/osmdroid

mapsforge相关库的仓库地址：http://jcenter.bintray.com/org/mapsforge/

map地图格式文件下载：http://ftp-stud.hs-esslingen.de/pub/Mirrors/download.mapsforge.org/maps/

1，先看实现的界面

网格实现

map地图格式

2，地图网格相关代码

直接加载版本，增加缩放监听即可

package com.osmdroid.sample;import android.graphics.Color;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import org.osmdroid.events.MapListener;import org.osmdroid.events.ScrollEvent;import org.osmdroid.events.ZoomEvent;import org.osmdroid.util.GeoPoint;import org.osmdroid.views.MapView;import org.osmdroid.views.overlay.FolderOverlay;import org.osmdroid.views.overlay.gridlines.LatLonGridlineOverlay;public class DirectGridActivity extends AppCompatActivity implements View.OnClickListener {    FolderOverlay activeLatLonGrid;    PRivate MapView mMapView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_fragment);        initView();    }    private void initView() {        mMapView = (MapView)findViewById(R.id.mymapview);        LatLonGridlineOverlay.setDefaults();        mMapView.setMaxZoomLevel(20);        mMapView.setMinZoomLevel(6);        mMapView.getController().setZoom(12);        mMapView.setTilesScaledToDpi(true);        mMapView.getController().setCenter(new GeoPoint(23.12645, 113.365575));        mMapView.setUseDataConnection(true);        mMapView.setMultiTouchControls(true);// 触控放大缩小        mMapView.getOverlayManager().getTilesOverlay().setEnabled(true);        mMapView.setMapListener(mapListener);        LatLonGridlineOverlay.fontSizeDp=16;        LatLonGridlineOverlay.fontColor= Color.argb(255,0,255,0);        LatLonGridlineOverlay.backgroundColor=Color.BLACK;        LatLonGridlineOverlay.lineColor=LatLonGridlineOverlay.fontColor;        updateGridlines();    }    MapListener mapListener = new MapListener() {        @Override        public boolean onScroll(ScrollEvent scrollEvent) {            updateGridlines();            return false;        }        @Override        public boolean onZoom(ZoomEvent zoomEvent) {            updateGridlines();            return false;        }    };    protected void updateGridlines(){        if (mMapView==null)            return; //happens during unit tests with rapid recycling of the fragment        if (activeLatLonGrid != null) {            mMapView.getOverlayManager().remove(activeLatLonGrid);            activeLatLonGrid.onDetach(mMapView);        }        LatLonGridlineOverlay.backgroundColor= Color.BLACK;        LatLonGridlineOverlay.fontColor= Color.BLUE;        LatLonGridlineOverlay.lineColor= Color.BLUE;        activeLatLonGrid = LatLonGridlineOverlay.getLatLonGrid(this, mMapView);        mMapView.getOverlays().add(activeLatLonGrid);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.button:                break;        }    }}使用Fragment绘制格网
package com.osmdroid.sample;import android.os.Bundle;import android.support.v4.app.FragmentManager;import android.support.v7.app.AppCompatActivity;import com.osmdroid.sample.util.SampleGridlines;import org.osmdroid.tileprovider.tilesource.TileSourceFactory;import org.osmdroid.util.GeoPoint;import org.osmdroid.views.MapView;public class GridFragmentActivity extends AppCompatActivity  {    private SampleGridlines mSampleGridlines = null;    private MapView mapView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_fragment);        initView();    }    private void initView() {        mapView = (MapView)findViewById(R.id.mymapview);//        mapView.setTileSource(TileSourceFactory.MAPNIK);        mapView.setDrawingCacheEnabled(true);        mapView.setMaxZoomLevel(20);        mapView.setMinZoomLevel(6);        mapView.getController().setZoom(12);        mapView.getController().setCenter(new GeoPoint(23.12645, 113.365575));        mapView.setUseDataConnection(true);        mapView.setMultiTouchControls(true);// 触控放大缩小        //是否显示地图数据源        mapView.getOverlayManager().getTilesOverlay().setEnabled(false);        FragmentManager fm = this.getSupportFragmentManager();        if (fm.findFragmentByTag("SampleGridlines") == null) {            mapView.setTileSource(TileSourceFactory.DEFAULT_TILE_SOURCE);            mSampleGridlines = new SampleGridlines();            fm.beginTransaction().add(R.id.samples_container, mSampleGridlines, "SampleGridlines").commit();        }    }}这个类也是osmdroid里面示例代码来的。我稍微修改了一下。
package com.osmdroid.sample.util;import android.graphics.Color;import com.osmdroid.sample.util.MapViewBaseSampleFragment;import org.osmdroid.events.MapListener;import org.osmdroid.events.ScrollEvent;import org.osmdroid.events.ZoomEvent;import org.osmdroid.util.GeoPoint;import org.osmdroid.views.overlay.FolderOverlay;import org.osmdroid.views.overlay.gridlines.LatLonGridlineOverlay;/** * An example on how to use the lat/lon gridline overlay. * * basically, listen for map motion/zoom events and remove the old overlay, then add the new one. * you can also override the color scheme and font sizes for the labels and lines */public class SampleGridlines extends MapViewBaseSampleFragment implements MapListener {    FolderOverlay activeLatLonGrid;    @Override    public String getSampleTitle() {        return "Lat/Lon Gridlines";    }    @Override    protected void addOverlays() {        super.addOverlays();        LatLonGridlineOverlay.setDefaults();        mMapView.setMaxZoomLevel(20);        mMapView.setMinZoomLevel(6);        mMapView.getController().setZoom(12);        mMapView.getController().setCenter(new GeoPoint(23.12645, 113.365575));        mMapView.setTilesScaledToDpi(true);        mMapView.setMapListener(this);        LatLonGridlineOverlay.fontSizeDp=16;        LatLonGridlineOverlay.fontColor= Color.argb(255,0,255,0);        LatLonGridlineOverlay.backgroundColor=Color.BLACK;        LatLonGridlineOverlay.lineColor=LatLonGridlineOverlay.fontColor;        updateGridlines();    }    @Override    public boolean onScroll(ScrollEvent scrollEvent) {        updateGridlines();        return false;    }    @Override    public boolean onZoom(ZoomEvent zoomEvent) {        updateGridlines();        return false;    }    protected void updateGridlines(){        if (mMapView==null)            return; //happens during unit tests with rapid recycling of the fragment        if (activeLatLonGrid != null) {            mMapView.getOverlayManager().remove(activeLatLonGrid);            activeLatLonGrid.onDetach(mMapView);        }        LatLonGridlineOverlay.backgroundColor= Color.BLACK;        LatLonGridlineOverlay.fontColor= Color.BLUE;        LatLonGridlineOverlay.lineColor= Color.BLUE;        activeLatLonGrid = LatLonGridlineOverlay.getLatLonGrid(getActivity(), mMapView);        mMapView.getOverlays().add(activeLatLonGrid);    }    @Override    public void onDestroyView(){        if (activeLatLonGrid!=null)            activeLatLonGrid.onDetach(mMapView);        activeLatLonGrid=null;        super.onDestroyView();    }}还有这个类的父类我就不贴出来。感兴趣下载示例代码以及apk对照。很多东西多看几眼就明白了。接下来说加载map格式地图
3，map与mapsforge
相关的库
    compile(name: 'osmdroid-android-5.6.3', ext: 'aar')    compile files('libs/mapsforge-map-android-0.6.1.jar')    compile files('libs/mapsforge-map-0.6.1.jar')    compile files('libs/mapsforge-core-0.6.1.jar')    compile files('libs/mapsforge-map-reader-0.6.1.jar')
还有这三个类
在osmdroid 示例代码也是可以找到的，或者jar包。
            //加载map地图格式            if(fileName.contains(".map")){                File[] mapfile = new File[1];                mapfile[0] = exitFile;                xmlRenderTheme theme = null;                try {                    theme = new AssetsRenderTheme(context, "renderthemes/","rendertheme-v4.xml");                    AndroidGraphicFactory.createInstance(context.getapplication());                }catch (Exception ex){                    ex.printStackTrace();                    return;                }                MapsForgeTileProvider forge = new MapsForgeTileProvider(new SimpleRegisterReceiver(context),                        MapsForgeTileSource.createFromFiles(mapfile,theme, "rendertheme-v4"),null);                mapView.setTileProvider(forge);                return;            }里面涉及到一个assets目录下建一个文件夹renderthemes，把rendertheme-v4.xml拷贝进去，相当于一个读取默认样式的。
最后嘱咐加上权限，联网以及读取目录的。
4，附上几张图，多了解一下
资源下载：后面上传之后再更新。
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