SampleJumboCache.java

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package org.osmdroid.samplefragments.cache;

import android.os.Bundle;
import android.widget.Toast;

import org.osmdroid.config.Configuration;
import org.osmdroid.samplefragments.BaseSampleFragment;
import org.osmdroid.tileprovider.constants.OpenStreetMapTileProviderConstants;
import org.osmdroid.views.overlay.Overlay;
import org.osmdroid.views.overlay.TilesOverlay;

import java.util.Iterator;

/**
 * An example on increasing the in memory tile cache. This is NOT the disk cache!
 *
 * Caution, setting these values too high may cause OOM errors on less capable devices!
 * @author alex
 */
public class SampleJumboCache  extends BaseSampleFragment {

	// ===========================================================
	// Constants
	// ===========================================================

	public static final String TITLE = "Jumbo Memory Cache";

	@Override
	public String getSampleTitle() {
		return TITLE;
	}

	// ===========================================================
	// Constructors
	// ===========================================================
	/** Called when the activity is first created. */
	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);
	}

	@Override
	protected void addOverlays() {
		super.addOverlays();

		Iterator<Overlay> iterator = mMapView.getOverlays().iterator();
		while(iterator.hasNext()){
			Overlay next = iterator.next();
			if (next instanceof TilesOverlay){
				TilesOverlay x = (TilesOverlay)next;
				x.setOvershootTileCache(x.getOvershootTileCache() * 2);
				Toast.makeText(getActivity(), "Tiles overlay cache set to " + x.getOvershootTileCache(), Toast.LENGTH_LONG).show();
				break;
			}
		}
		//this will set the disk cache size in MB to 1GB , 900MB trim size
		//Configuration.getInstance().setTileFileSystemCacheTrimBytes(900L * 1024 * 1024);
		//Configuration.getInstance().setTileFileSystemCacheMaxBytes(1000L * 1024 * 1024);
	}

	@Override
	public void onPause(){
		super.onPause();
		//OpenStreetMapTileProviderConstants.setCacheSizes(500L, 600L);
		Iterator<Overlay> iterator = mMapView.getOverlays().iterator();
		while(iterator.hasNext()){
			Overlay next = iterator.next();
			if (next instanceof TilesOverlay){
				TilesOverlay x = (TilesOverlay)next;
				x.setOvershootTileCache(x.getOvershootTileCache() / 2);
				Toast.makeText(getActivity(), "Tiles overlay cache set to " + x.getOvershootTileCache(), Toast.LENGTH_LONG).show();
				break;
			}
		}
	}
}