Estimote SDK: Building a beacon Android app ---- 3/3

since: 2016/07/20
update: 2016/07/20
reference:
1. Beacon Tech Overview - Estimote Developer

 Part 3: Ranging beacons

A. Start ranging
    1. 開啟 MainActivity.java 修改如下:
package myhome.airport;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

import com.estimote.sdk.Beacon;
import com.estimote.sdk.BeaconManager;
import com.estimote.sdk.Region;
import com.estimote.sdk.SystemRequirementsChecker;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;

public class MainActivity extends AppCompatActivity {

    private BeaconManager beaconManager;
    private Region region;

    private static final Map<String, List<String>> PLACES_BY_BEACONS;

    // TODO: replace "<major>:<minor>" strings to match your own beacons.
    static {
        Map<String, List<String>> placesByBeacons = new HashMap<>();
        placesByBeacons.put("0:5", new ArrayList<String>() {{
            add("Heavenly Sandwiches");
            // read as: "Heavenly Sandwiches" is closest
            // to the beacon with major 0 and minor 5
            add("Green & Green Salads");
            // "Green & Green Salads" is the next closest
            add("Mini Panini");
            // "Mini Panini" is the furthest away
        }});
        placesByBeacons.put("0:7", new ArrayList<String>() {{
            add("Mini Panini");
            add("Green & Green Salads");
            add("Heavenly Sandwiches");
        }});
        PLACES_BY_BEACONS = Collections.unmodifiableMap(placesByBeacons);
    }

    private List<String> placesNearBeacon(Beacon beacon) {
        String beaconKey = String.format("%d:%d", beacon.getMajor(), beacon.getMinor());
        if (PLACES_BY_BEACONS.containsKey(beaconKey)) {
            return PLACES_BY_BEACONS.get(beaconKey);
        }
        return Collections.emptyList();
    }

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

        beaconManager = new BeaconManager(this);
        region = new Region("ranged region",
                UUID.fromString("FDA50693-A4E2-4FB1-AFCF-C6EB07647825"), null, null);

        // add Ranging listener
        beaconManager.setRangingListener(new BeaconManager.RangingListener() {
            @Override
            public void onBeaconsDiscovered(Region region, List<Beacon> list) {
                if (!list.isEmpty()) {
                    Beacon nearestBeacon = list.get(0);
                    List<String> places = placesNearBeacon(nearestBeacon);
                    // TODO: update the UI here
                    Log.d("Airport", "Nearest places: " + places);
                    Log.d("Major: ", ""+nearestBeacon.getMajor());
                    Log.d("Minor: ", ""+nearestBeacon.getMinor());
                    Log.d("UUID: ", ""+ nearestBeacon.getProximityUUID());
                    Log.d("MeasuredPower: ", ""+ nearestBeacon.getMeasuredPower());
                    Log.d("Rssi: ", ""+ nearestBeacon.getRssi());
                }
            }
        });
    }

    //@add ########################
    @Override
    protected void onResume() {
        super.onResume();

        //@add ########################
        // Runtime permissions (Android 6.0)
        SystemRequirementsChecker.checkWithDefaultDialogs(this);

        // start Ranging
        beaconManager.connect(new BeaconManager.ServiceReadyCallback() {
            @Override
            public void onServiceReady() {
                beaconManager.startRanging(region);
            }
        });
    }

    //@add ########################
    @Override
    protected void onPause() {

        // stop Ranging
        beaconManager.stopRanging(region);

        super.onPause();
    }

}

    2. 結果: