使用 Android AltBeacon 库获取连续的 iBeacons 信息

Question

我正在使用 RadiusNetworks 的 AltBeacon 库开发一个 Android 应用程序。我正在使用导航抽屉（启动活动，而不是片段）来显示不同的部分。因此，我有一个主要的 activity 用于抽屉，它通过意图启动不同的活动。

我想在应用程序的任何地方都提供附近的 iBeacons 信息（ID 和距离）。如何解决这个问题？

我尝试了以下方法（如果我们将我的应用程序结构与 RadiusNetworks 提供的参考结构进行映射）：

BeaconReferenceApp：与参考应用相同。启动 MainActivity。
MainActivity：我合并了 Monitoring 和 Ranging 活动。此 activity 还管理导航抽屉。
第 1 部分：这部分扩展了 MainActivity 并根据 iBeacons 收集的数据显示一些信息。

在 MainActivity 中，我执行以下操作：

public void onBeaconServiceConnect() {
        beaconManager.setRangeNotifier(new RangeNotifier() {
            @Override
            public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
                for (Beacon beacon : beacons) {
                    Log.i("TAG","Beacon detected with id1: "+beacon.getId1()+" id2:"+beacon.getId2()+" id3: "+beacon.getId3()+" distance: "+beacon.getDistance());
                }
            }

        });

        try {
            beaconManager.startRangingBeaconsInRegion(new Region("myRangingUniqueId", null, null, null));
        } catch (RemoteException e) {   }
    }

我可以在日志中看到 iBeacon 信息，但只有一次（第一次检测）。但是，我想在每次看到 iBeacon 时持续获取此信息（就像在参考应用程序中发生的那样），以便我可以将其传递给我的其他活动。

我该如何解决这个问题？我应该使用不同的应用程序结构（因为导航抽屉）还是我以错误的方式使用库？

谢谢。

更新：MainActivity 和 BeaconReferenceApp 的代码。

BeaconReferenceApp：

public class BeaconReferenceApp extends Application implements BootstrapNotifier {

    private static final String TAG = "BeaconApp";
    private RegionBootstrap regionBootstrap;
    private BackgroundPowerSaver backgroundPowerSaver;
    private boolean haveDetectedBeaconsSinceBoot = false;
    private MainActivity mainActivity = null;

    public void onCreate() {
        super.onCreate();
        BeaconManager beaconManager = org.altbeacon.beacon.BeaconManager.getInstanceForApplication(this);
        beaconManager.getBeaconParsers().add(new BeaconParser().
                setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"));


        Log.d(TAG, "setting up background monitoring for beacons and power saving");
        // wake up the app when a beacon is seen
        Region region = new Region("backgroundRegion", null, null, null);
        regionBootstrap = new RegionBootstrap(this, region);
        backgroundPowerSaver = new BackgroundPowerSaver(this);
    }

  public void didEnterRegion(Region arg0) {

        Log.d(TAG, "did enter region.");
        // regionBootstrap.disable();
        if (!haveDetectedBeaconsSinceBoot) {
            Log.d(TAG, "auto launching MainActivity");

            // The very first time since boot that we detect an beacon, we launch the MainActivity
            Intent intent = new Intent(this, MainActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            this.startActivity(intent);
            haveDetectedBeaconsSinceBoot = true;
        } else {

               sendNotification();
        }

    }

public void didExitRegion(Region region) {}
public void didDetermineStateForRegion(int state, Region region) {}
public void setMainActivity(MainActivity activity) {this.mainActivity = activity;}

主要活动：

public class MainActivity extends ActionBarActivity implements BeaconConsumer {

    protected FrameLayout frameLayout;
    protected ListView mDrawerList;
    protected String[] listArray = { "Item1", "Item2", "Item3", "Item4" };
    protected static int position;
    private static boolean isLaunch = true;
    private DrawerLayout mDrawerLayout;
    private ActionBarDrawerToggle actionBarDrawerToggle;
    private BeaconManager beaconManager = BeaconManager.getInstanceForApplication(this);


    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        verifyBluetooth();
        beaconManager.bind(this);

        setContentView(R.layout.navigation_drawer_base_layout);

        frameLayout = (FrameLayout)findViewById(R.id.content_frame);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.left_drawer);

        // set up the drawer's list view with items and click listener
        mDrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_list_item, listArray));
        mDrawerList.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {

                openActivity(position);
            }
        });

        // enable ActionBar app icon to behave as action to toggle nav drawer
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);

        // ActionBarDrawerToggle ties together the proper interactions between the sliding drawer and the action bar app icon
        actionBarDrawerToggle = new ActionBarDrawerToggle(
                this,                       /* host Activity */
                mDrawerLayout,              /* DrawerLayout object */
                R.string.open_drawer,       /* "open drawer" description for accessibility */
                R.string.close_drawer)      /* "close drawer" description for accessibility */
        {

            public void onDrawerClosed(View drawerView) {
                getSupportActionBar().setTitle(listArray[position]);
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
                super.onDrawerClosed(drawerView);
            }

            public void onDrawerOpened(View drawerView) {
                getSupportActionBar().setTitle(getString(R.string.app_name));
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
                super.onDrawerOpened(drawerView);
            }

            public void onDrawerSlide(View drawerView, float slideOffset) {
                super.onDrawerSlide(drawerView, slideOffset);
            }

            public void onDrawerStateChanged(int newState) {
                super.onDrawerStateChanged(newState);
            }
        };
        actionBarDrawerToggle.syncState();
        mDrawerLayout.setDrawerListener(actionBarDrawerToggle);


        /**
         * MainActivity is intended just to add navigation drawer in the app.
         * Open some activity with layout on launch. Check checking if this 
         * MainActivity is called first time when we are
         * opening our first activity.
         * */
        if(isLaunch){
            /**
             *Setting this flag false so that next time it will not open
             * first activity.
             * Use this flag because we are using MainActivity
             * as parent activity to our other activities.
             * In this case this base activity will always be call when any
             * child activity will launch.
             */
            isLaunch = false;
            openActivity(0);
        }
    }

    /**
     * Launching activity when any list item is clicked.
     */
    protected void openActivity(int position) {

        mDrawerLayout.closeDrawer(mDrawerList);
        MainActivity.position = position; //Setting currently selected position in this field so that it will be available in child activities.

        switch (position) {
            case 0:
                startActivity(new Intent(this, Item1.class));
                break;
            case 1:
                startActivity(new Intent(this, Item2.class));
                break;
            case 2:
                startActivity(new Intent(this, Item3.class));
                break;
            case 3:
                startActivity(new Intent(this, Item4.class));
                break;
            default:
                break;
        }
    }

    public void onDestroy() {
        super.onDestroy();
        beaconManager.unbind(this);
    }

    public void onResume() {
        super.onResume();
        ((BeaconReferenceApp) this.getApplicationContext()).setMainActivity(this);
        if (beaconManager.isBound(this)) beaconManager.setBackgroundMode(false);
    }

    public void onPause() {
        super.onPause();
        ((BeaconReferenceApp) this.getApplicationContext()).setMainActivity(null);
        if (beaconManager.isBound(this)) beaconManager.setBackgroundMode(true);
    }

    private void verifyBluetooth() {}

    public void onBeaconServiceConnect() {
        beaconManager.setRangeNotifier(new RangeNotifier() {
            @Override
            public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
                for (Beacon beacon : beacons) {
                    Log.i("TAG", "Beacon detected with id1: " + beacon.getId1() + " id2:" + beacon.getId2() + " id3: " + beacon.getId3() + " distance: " + beacon.getDistance());
                }
            }

        });

        try {
            beaconManager.startRangingBeaconsInRegion(new Region("myRangingUniqueId", null, null, null));
        } catch (RemoteException e) {   }
    }

}

Answer 1

最简单的方法是在自定义 android.app.Application class 中进行测距。每个 Android 应用程序都有其中之一，这是放置您希望对整个应用程序通用的代码的好地方。要定义你自己的 class，你可以在你的清单中通过添加一个属性来声明它：

<application
    ...
    android:name="MyApplication">

然后你可以定义一个具有相同名称的 class 来进行这样的测距：

public class MyApplication extends Application implements BeaconConsumer {
    private BeaconManager mBeaconManager;

    public void onCreate() {
        super.onCreate();
        mbeaconManager = org.altbeacon.beacon.BeaconManager.getInstanceForApplication(this);
        mBeaconManager.bind(this);
    }
    public void onBeaconServiceConnect() {
        mBeaconManager.setRangeNotifier(new RangeNotifier() {
            @Override
            public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
                for (Beacon beacon : beacons) {
                    Log.i("TAG","Beacon detected with id1: "+beacon.getId1()+" id2:"+beacon.getId2()+" id3: "+beacon.getId3()+" distance: "+beacon.getDistance());
                }
            }

        });

        try {
            mBeaconManager.startRangingBeaconsInRegion(new Region("myRangingUniqueId", null, null, null));
        } catch (RemoteException e) {   }
    }

如果您可以执行 Application class 中的所有逻辑，这就是您需要做的全部。但是，您可能需要将测距数据转发给各个活动或片段。如果是这样，最简单的方法是从片段或 activity 中获取对中央 Application class 的引用，如下所示：

MyApplication myApplication = ((MyApplication)this.getApplication());

然后您可以从 Application class 访问集中存储的数据，或者告诉 Application class 将 didRangeBeaconsInRegion 回调转发给您的activity 或片段。

Answer 2

我已经解决了修改 Beaconing 的问题 class（我只显示更改）：

public class Beaconing extends Application implements BootstrapNotifier, BeaconConsumer {

....

private BeaconManager beaconManager = null;

....

public void onCreate() {
        super.onCreate();
        beaconManager = org.altbeacon.beacon.BeaconManager.getInstanceForApplication(this);

....

}

....

public void onBeaconServiceConnect() {
    beaconManager.setBackgroundMode(true);
}

所以我实现了 BeaconConsumer，将 beaconManager 设置为 null 并在 onCreate() 中获取它，然后我添加了 onBeaconServiceConnect()。

这种方式对我有用，我实际上得到了连续测距。

然而我不知道为什么它以前不起作用。如果有人知道并解释它，我会很高兴。

感谢@davidgyoung (https://whosebug.com/users/1461050/davidgyoung) 的帮助！ :)

使用 Android AltBeacon 库获取连续的 iBeacons 信息

Get continuous iBeacons info with Android AltBeacon Library

android

navigation-drawer

ibeacon-android

altbeacon