如何在 didRangeBeaconsInRegion 中使用测距

How to use ranging in didRangeBeaconsInRegion

--------编辑 2--------

仍在使用 Davidgyoung 的 post 和这些评论,现在我有一个 FatalException:

E/AndroidRuntime﹕ FATAL EXCEPTION: IntentService[BeaconIntentProcessor] Process: databerries.beaconapp, PID: 19180 java.lang.NullPointerException at databerries.beaconapp.MyApplicationName.didEnterRegion(MyApplicationName.java:76) at org.altbeacon.beacon.BeaconIntentProcessor.onHandleIntent(BeaconIntentProcessor.java:83) at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:136) at android.os.HandlerThread.run(HandlerThread.java:61)

这个错误是因为调用了setRangeNotifier()?

--------编辑--------

在 Davidgyoung 的 post 和这些评论之后,我尝试了这个方法,但仍然没有用:

public class MyApplicationName extends Application implements BootstrapNotifier {
private static final String TAG = ".MyApplicationName";
private RegionBootstrap regionBootstrap;
private BeaconManager beaconManager;

List region_list = new ArrayList();

@Override
public void onCreate() {
    super.onCreate();
    Log.d(TAG, "App started up");
    // wake up the app when any beacon is seen (you can specify specific id filers in the parameters below)
    List region_list = myRegionList();
    regionBootstrap = new RegionBootstrap(this, region_list);

    BeaconManager beaconManager = 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"));
    beaconManager.setBackgroundScanPeriod(3000l);
    beaconManager.setBackgroundBetweenScanPeriod(5000l);
}

@Override
public void didDetermineStateForRegion(int arg0, Region arg1) {
    // Don't care
}

@Override
public void didEnterRegion(Region region) {
    Log.d(TAG, "Got a didEnterRegion call");
    // This call to disable will make it so the activity below only gets launched the first time a beacon is seen (until the next time the app is launched)
    // if you want the Activity to launch every single time beacons come into view, remove this call.
    regionBootstrap.disable();
    Intent intent = new Intent(this, MyActivity.class);
    // IMPORTANT: in the AndroidManifest.xml definition of this activity, you must set android:launchMode="singleInstance" or you will get two instances
    // created when a user launches the activity manually and it gets launched from here.
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    this.startActivity(intent);

    String zone = region.toString();
    Log.d(TAG, "Enter in region");
    String text = "Enter in " + zone;
    Log.d(TAG, text);
    String uuid = "UUID : " + region.getId1();
    Log.d(TAG, uuid);
    //This part is not working
    beaconManager.setRangeNotifier(this);
    beaconManager.startRangingBeaconsInRegion(region);
}

@Override
public void didExitRegion(Region arg0) {
    // Don't care
}

错误是关于 setRangeNotifier 中的输入和 startRangingBeaconsInRegion

的异常

这不是我的主要 class,我的主要 class :

public class MyActivity extends Activity{
public final static String EXTRA_MESSAGE = "com.example.myapp.MESSAGE";
/**
 * Called when the activity is first created.
 */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Log.d("myActivity","onCreate");

}

}

我想要该地区所有信标的ID。如果我理解这种方法,当她检测到一个区域时,应用程序会在后台唤醒,通常 "startRangingBeaconsInRegion" 可以给我一个信标列表,我可以使用这个 ID。

--------原创--------

我想知道我身边所有的灯塔。我知道这个信标的 UUID,我可以用 'region.toString();' 得到它。但是,我需要信标的其他 ID。而且,我在 didRangeBeaconsInRegion 上没有 "Beacon"。

如何知道区域内的信标?

最后一个问题,可以在后台进行吗?

谢谢

您可以在此处的 "Ranging Sample Code" 部分查看信标测距示例:http://altbeacon.github.io/android-beacon-library/samples.html

这将允许您通过查看回调中 Collection<Beacon> beacons 中返回的每个 Beacon 对象来读取所有标识符。像这样:

        public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
            for (Beacon beacon: beacons) {
                Log.i(TAG, "This beacon has identifiers:"+beacon.getId1()+", "+beacon.getId2()+", "+beacon.getId3());        
            }
        }

一旦您开始测距,它将在后台继续这样做,前提是您不退出开始测距的 activity。在库的某些使用下,测距在后台变慢,但这仅在使用 BackgroundPowerSaver class 时才会发生。如果您不希望测距在后台变慢,只需不要启用库的后台节能。