pl.mg6.newmaps.demo.AddMarkersInBackgroundExampleActivity.java Source code

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Here is the source code for pl.mg6.newmaps.demo.AddMarkersInBackgroundExampleActivity.java

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/*
 * Copyright (C) 2013 Maciej Grski
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package pl.mg6.newmaps.demo;

import java.util.Arrays;
import java.util.Comparator;
import java.util.Random;

import pl.mg6.newmaps.demo.util.GoogleMapHelper;
import pl.mg6.newmaps.demo.util.LatLngUtils;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.support.v4.app.FragmentActivity;
import android.util.Log;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class AddMarkersInBackgroundExampleActivity extends FragmentActivity {

    private static final String TAG = AddMarkersInBackgroundExampleActivity.class.getSimpleName();

    private GoogleMap map;

    private LatLngDistance[] positions = new LatLngDistance[ManyMarkersExampleActivity.MARKERS_COUNT];
    private int count = positions.length;

    private Handler handler = new Handler();
    private Runnable batchAddMarkersRunnable = new Runnable() {

        private static final int ADD_IN_BATCH = 10;
        private static final int DELAY = 1;

        private LatLng previousCameraPosition;

        @Override
        public void run() {
            if (count == 0) {
                return;
            }
            sortPositionsIfNeeded();
            long start = SystemClock.uptimeMillis();
            for (int i = 0; i < ADD_IN_BATCH && count > 0; i++) {
                count--;
                LatLngDistance position = positions[count];
                positions[count] = null;
                map.addMarker(new MarkerOptions().position(position.latLng));
            }
            long end = SystemClock.uptimeMillis();
            Log.w(TAG, "addMarkers time: " + (end - start));
            handler.postDelayed(this, DELAY);
        }

        private void sortPositionsIfNeeded() {
            final LatLng cameraPosition = map.getCameraPosition().target;
            if (previousCameraPosition == null
                    || LatLngUtils.distanceSquared(previousCameraPosition, cameraPosition) > 400.0) {
                previousCameraPosition = cameraPosition;
                long start = SystemClock.uptimeMillis();
                for (int i = 0; i < count; i++) {
                    LatLngDistance p = positions[i];
                    p.distance = LatLngUtils.distanceSquared(cameraPosition, p.latLng);
                }
                Arrays.sort(positions, 0, count, new Comparator<LatLngDistance>() {
                    public int compare(LatLngDistance lhs, LatLngDistance rhs) {
                        return Double.compare(rhs.distance, lhs.distance);
                    }
                });
                long end = SystemClock.uptimeMillis();
                Log.w(TAG, "sort time: " + (end - start));
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.many_markers_example);

        map = GoogleMapHelper.getMap(this, R.id.many_markers_map);

        Random r = new Random();

        long start = SystemClock.uptimeMillis();
        for (int i = 0; i < ManyMarkersExampleActivity.MARKERS_COUNT; i++) {
            LatLng position = new LatLng((r.nextDouble() - 0.5) * 170.0, (r.nextDouble() - 0.5) * 360.0);
            positions[i] = new LatLngDistance(position);
        }
        long end = SystemClock.uptimeMillis();
        Log.w(TAG, "generate time: " + (end - start));
    }

    @Override
    protected void onResume() {
        super.onResume();
        handler.post(batchAddMarkersRunnable);
    }

    @Override
    protected void onPause() {
        super.onPause();
        handler.removeCallbacks(batchAddMarkersRunnable);
    }

    private static class LatLngDistance {

        private LatLng latLng;
        private double distance;

        private LatLngDistance(LatLng latLng) {
            this.latLng = latLng;
        }
    }
}