SampleSqliteOnly.java

package org.osmdroid.samplefragments.cache;

import android.os.Environment;
import android.widget.Toast;

import org.osmdroid.samplefragments.BaseSampleFragment;
import org.osmdroid.tileprovider.modules.ArchiveFileFactory;
import org.osmdroid.tileprovider.modules.IArchiveFile;
import org.osmdroid.tileprovider.modules.OfflineTileProvider;
import org.osmdroid.tileprovider.tilesource.FileBasedTileSource;
import org.osmdroid.tileprovider.tilesource.TileSourceFactory;
import org.osmdroid.tileprovider.util.SimpleRegisterReceiver;

import java.io.File;
import java.util.Set;


/**
 * test to force sqlite tiles only loaded
 * https://github.com/osmdroid/osmdroid/issues/272
 *
 * requires API 11 or higher in order to function properly
 * Created by alex on 2/21/16.
 */
public class SampleSqliteOnly extends BaseSampleFragment {
    @Override
    public String getSampleTitle() {
        return "SQLite Only";
    }

    @Override
    public void addOverlays() {
        this.mMapView.setUseDataConnection(false);

        //first we'll look at the default location for tiles that we support
        File f = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/osmdroid/");
        if (f.exists()) {

            File[] list = f.listFiles();
            if (list != null) {
                for (int i = 0; i < list.length; i++) {
                    if (list[i].isDirectory()) {
                        continue;
                    }
                    String name = list[i].getName().toLowerCase();
                    if (!name.contains(".")) {
                        continue; //skip files without an extension
                    }
                    name = name.substring(name.lastIndexOf(".") + 1);
                    if (name.length() == 0) {
                        continue;
                    }
                    //narrow it down to only sqlite tiles
                    if (ArchiveFileFactory.isFileExtensionRegistered(name) &&
                            name.equals("sqlite")) {
                        try {

                            //ok found a file we support and have a driver for the format, for this demo, we'll just use the first one

                            //create the offline tile provider, it will only do offline file archives
                            //again using the first file
                            OfflineTileProvider tileProvider = new OfflineTileProvider(new SimpleRegisterReceiver(getActivity()),
                                    new File[]{list[i]});
                            //tell osmdroid to use that provider instead of the default rig which is (asserts, cache, files/archives, online
                            mMapView.setTileProvider(tileProvider);

                            //this bit enables us to find out what tiles sources are available. note, that this action may take some time to run
                            //and should be ran asynchronously. we've put it inline for simplicity

                            String source = "";
                            IArchiveFile[] archives = tileProvider.getArchives();
                            if (archives.length > 0) {
                                //cheating a bit here, get the first archive file and ask for the tile sources names it contains
                                Set<String> tileSources = archives[0].getTileSources();
                                //presumably, this would be a great place to tell your users which tiles sources are available
                                if (!tileSources.isEmpty()) {
                                    //ok good, we found at least one tile source, create a basic file based tile source using that name
                                    //and set it. If we don't set it, osmdroid will attempt to use the default source, which is "MAPNIK",
                                    //which probably won't match your offline tile source, unless it's MAPNIK
                                    source = tileSources.iterator().next();
                                    this.mMapView.setTileSource(FileBasedTileSource.getSource(source));
                                } else {
                                    this.mMapView.setTileSource(TileSourceFactory.DEFAULT_TILE_SOURCE);
                                }

                            } else {
                                this.mMapView.setTileSource(TileSourceFactory.DEFAULT_TILE_SOURCE);
                            }

                            Toast.makeText(getActivity(), "Using " + list[i].getAbsolutePath() + " " + source, Toast.LENGTH_SHORT).show();
                            this.mMapView.invalidate();
                            return;
                        } catch (Exception ex) {
                            ex.printStackTrace();
                        }
                    }
                }
            }
            Toast.makeText(getActivity(), f.getAbsolutePath() + " did not have any files I can open! Try using MOBAC", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(getActivity(), f.getAbsolutePath() + " dir not found!", Toast.LENGTH_SHORT).show();
        }


    }
}