Question

我希望我的应用程序在信标到达一定距离（我的情况下是1米）时自动启动活动

当我插入或拔下充电器以及启动设备时我的活动启动但是当我关闭应用程序并且信标在1米内时它没有自动启动。

我想要的是如果信标是1米，那么活动应该自行启动。

我正在使用android beacon库并遵循上面提到的相同步骤 https://altbeacon.github.io/android-beacon-library/samples.html

我的清单文件代码是

 <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>

我的应用类代码是：

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);               
                }       

            }

        }
    }        
}

我的主要活动课程是：

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

应用关闭后Android Beacon Library的行为因其关闭方式而异。如果您使用后退按钮，则信标扫描会以背景速率（在Android 4.x 上每5分钟一次）继续运行。如果您使用任务切换器将其终止，它将尽快恢复扫描（连接电源/断开连接或重新启动时）。

此处详细信息：http://altbeacon.github.io/android-beacon-library/resume-after-terminate.html

您的代码看起来可以在上述参数中执行您想要的操作。当应用程序在后台时，您可能只是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量，但可以配置。在Android 5.x上，如果从没有信标可见到信标可见，则不会出现此延迟。

详情请见此处：http://altbeacon.github.io/android-beacon-library/battery_manager.html

当信标进入一定距离时自动启动活动

1 个答案: