自动当信标来在一定距离

Question

我想我的应用程序自动启动一个活动时标涉及在一定距离内（在它1米，我的情况）

我的活动被当我插上推出发起活动插入或关闭充电器，当我启动设备时，但是当我关闭应用程序并且信标在1米内时没有自动启动。

我想要的是如果信标在1米内，那么活动应该自行启动。

我使用的Android灯塔库，下面就 https://altbeacon.github.io/android-beacon-library/samples.html

我的清单文件代码中提到的相同步骤是

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="org.altbeacon.beaconreference" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk 
     android:minSdkVersion="17" 
     android:targetSdkVersion="21" /> 
    <uses-permission android:name="android.permission.INTERNET" /> 
    <uses-permission android:name="android.permission.BLUETOOTH"/> 
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/> 
    <uses-feature android:name="android.hardware.bluetooth_le" android:required="false"/> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" 
     android:name="org.altbeacon.beaconreference.MyApplicationName"> 

    <activity 
      android:launchMode="singleInstance" 
      android:name="org.altbeacon.beaconreference.MainActivity" 
      android:label="@string/app_name" > 
      <intent-filter> 
     <action android:name="android.intent.action.MAIN" /> 
       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

    </application> 

</manifest> 

我的应用程序类的代码是：

import java.util.Collection; 
import android.app.Application; 
import android.content.Intent; 
import android.os.RemoteException; 
import android.util.Log; 
import android.widget.Toast; 
import org.altbeacon.beacon.powersave.BackgroundPowerSaver; 
import org.altbeacon.beacon.startup.BootstrapNotifier; 
import org.altbeacon.beacon.startup.RegionBootstrap; 
import org.altbeacon.beacon.Beacon; 
import org.altbeacon.beacon.BeaconManager; 
import org.altbeacon.beacon.BeaconParser; 
import org.altbeacon.beacon.RangeNotifier; 
import org.altbeacon.beacon.Region; 

public class MyApplicationName extends Application implements BootstrapNotifier, RangeNotifier { 
    private static final String TAG = ".MyApplicationName"; 
    private RegionBootstrap regionBootstrap; 
    private BeaconManager mBeaconManager; 
    private Region region; 
    private Region mAllBeaconsRegion; 
    private BackgroundPowerSaver mBackgroundPowerSaver; 
    private RegionBootstrap mRegionBootstrap; 
    @Override 
    public void onCreate() { 

     mAllBeaconsRegion = new Region("all beacons", null, null, null); 
     mBeaconManager = BeaconManager.getInstanceForApplication(this); 
     mBackgroundPowerSaver = new BackgroundPowerSaver(this);  
     mRegionBootstrap = new RegionBootstrap(this, mAllBeaconsRegion); 

     // By default the AndroidBeaconLibrary will only find AltBeacons. If you wish to make it 
     // find a different type of beacon, you must specify the byte layout for that beacon's 
     // advertisement with a line like below. The example shows how to find a beacon with the 
     // same byte layout as AltBeacon but with a beaconTypeCode of 0xaabb 
     //   
     Log.d(TAG, " region. starting ranging"); 

     mBeaconManager.getBeaconParsers().add(new BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24")); 
     mBeaconManager.setBackgroundScanPeriod(11000l); 

    } 

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

    @Override 
    public void didEnterRegion(Region arg0) { 

     mRegionBootstrap.disable(); 
     // 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. 
     try { 

      mBeaconManager.startRangingBeaconsInRegion(new Region("all beacons", null, null, null)); 
      mBeaconManager.setRangeNotifier(this); 
     } catch (RemoteException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     Log.d(TAG, "Got a didEnterRegion call"); 

    } 

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

    @Override 
    public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) { 
     // TODO Auto-generated method stub 
     if (beacons.size() > 0) { 

      for (Beacon beacon: beacons) {    

       if(beacon.getDistance()<1) 
       { 
        Log.d(TAG, "within 1 minute call"); 
        Intent intent = new Intent(this, MainActivity.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);    
       }  

      } 

     } 
    }   
} 

我主要活动等级是：

import android.app.Activity; 
import android.os.Bundle; 

public class MainActivity extends Activity{ 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState);  
     setContentView(R.layout.activity_main);  
    } 

} 

Answer 1

应用程序关闭后Android Beacon库的行为因其关闭方式而异。如果您使用后退按钮，信标扫描将继续以背景速率进行（，Android 4.x每5分钟一次）。如果使用任务切换器杀死它，它将尽快恢复扫描（电源连接/断开或重新启动）。

全部细节在这里：http://altbeacon.github.io/android-beacon-library/resume-after-terminate.html

你的代码看起来OK做你想要的是上述的参数范围内的东西。当应用程序处于后台时，您可能只会看到五分钟的检测延迟。在后台每五分钟扫描一次以节省电池，但可配置。在Android 5.x上，如果您从无可见的信标到可见的信标，则此延迟不存在。

看到这里的细节：http://altbeacon.github.io/android-beacon-library/battery_manager.html