我在使用android-beacon-library. 这是我的问题：
我有三个主要课程MainActivity：BaseService和BeaconService。
MainActivity: 只是做startForeground和stopForeground操作。BaseService: 做一些参数初始化BeaconManager等等。BeaconService: 信标操作。
我先描述我的问题。我正在使用前台服务进行扫描操作，backgroundScanPeriod 为 20l。而且我还有一个带有两个按钮的 MainActivity，startService 和 stopService。当我第一次打开应用程序并单击 startService 时，扫描周期为 10 秒。
然后我单击 HOME 并终止此应用程序，服务运行正常，扫描周期也是 10 秒。MainActivity但是当我通过单击图片上的通知
重新打开时。
扫描周期将变为 1s。对我来说很快。但是如果我再次单击 HOME，扫描周期将变得正常。这意味着，除了我第一次打开 MainActivity 之外，每次扫描周期都会变得非常快。
我想知道为什么。下面是我的重要代码：
MainActivity.class
@OnClick(R.id.start_service)
void start_Service() {
if (Utils.isServiceRunning(MainActivity.this, Constants.CLASSNAME)) {
Toast.makeText(this, "service is running, don't start again", Toast.LENGTH_SHORT).show();
} else {
Intent intent = new Intent(MainActivity.this, BeaconService.class);
intent.setAction(Constants.ACTION.STARTFOREGROUND_ACTION);
startService(intent);
setInfo();
}
}
@OnClick(R.id.stop_service)
void stop_Service() {
if (Utils.isServiceRunning(MainActivity.this, Constants.CLASSNAME)) {
Intent intent = new Intent(MainActivity.this, BeaconService.class);
intent.setAction(Constants.ACTION.STOPFOREGROUND_ACTION);
startService(intent);
setInfo();
} else {
Toast.makeText(this, "service is dead, don't kill again", Toast.LENGTH_SHORT).show();
}
}
BaseService.class
private void setBeaconManager() {
beaconManager.setBackgroundBetweenScanPeriod(20l);
beaconManager.setBackgroundMode(true);
beaconManager.getBeaconParsers().clear();
beaconManager.getBeaconParsers().add(new BeaconParser().setBeaconLayout(Constants.BEACON_LAYOUT.COMMON_LAYOUT));
}
BeaconService.class
public class BeaconService extends BaseService implements BootstrapNotifier, BeaconConsumer {
private static final int NOTIFICATION = R.string.notify_service_started;
private static final String TAG = "BeaconService";
private int size = -1;
private RegionBootstrap regionBootstrap;
private BackgroundPowerSaver backgroundPowerSaver;
private Beacon beacon;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "onCreate");
regionBootstrap = new RegionBootstrap(this, region);
beaconManager.bind(this);
backgroundPowerSaver = new BackgroundPowerSaver(getApplicationContext());
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent != null && intent.getAction() != null) {
switch (intent.getAction()) {
case Constants.ACTION.STARTFOREGROUND_ACTION:
startForeground(NOTIFICATION, getNotification());
break;
case Constants.ACTION.STOPFOREGROUND_ACTION:
Log.d(TAG, "Received stop foreground request");
stopForeground(true);
stopSelf();
break;
}
}
return START_STICKY;
}
@Override
public void onDestroy() {
beaconManager.unbind(this);
regionBootstrap.disable();
Log.d(TAG, "service onDestroy");
}
/**
* Called when at least one beacon in a Region is visible.
*
* @param region region
*/
@Override
public void didEnterRegion(Region region) {
// TODO: 3/8/16 reload all the resource
Log.d(TAG, "didEnterRegion called");
L.object(region);
try {
beaconManager.startRangingBeaconsInRegion(region);
} catch (RemoteException e) {
e.printStackTrace();
}
}
/**
* Called when no beacons in a Region are visible.
*
* @param region region
*/
@Override
public void didExitRegion(Region region) {
// TODO: 3/8/16 close all the resource
Log.d(TAG, "didExitRegion called");
try {
beaconManager.stopRangingBeaconsInRegion(region);
} catch (RemoteException e) {
e.printStackTrace();
}
beaconManager.unbind(this);
regionBootstrap.disable();
L.object(region);
}
/**
* Called with a state value of MonitorNotifier.INSIDE when at least one beacon in a Region is visible
*
* @param region region
*/
@Override
public void didDetermineStateForRegion(int i, Region region) {
Log.d(TAG, "switch from seeing/not seeing beacons");
L.object(region);
}
@Override
public void onBeaconServiceConnect() {
Log.d(TAG, "onBeaconServiceConnect");
if (null == beaconManager.getRangingNotifier()) {
beaconManager.setRangeNotifier(new RangeNotifier() {
@Override
public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
Log.d(TAG, "beacons.size():" + beacons.size() + "," + this);
if (beacons.size() != 0) {
Iterator<Beacon> iterator = beacons.iterator();
if (beacons.size() != size) {
saveBeacon(iterator);
size = beacons.size();
}
}
}
});
}
}
/**
* Save beacon p-o-j-o to SQLite.
*/
private void saveBeacon(Iterator<Beacon> iterator) {
while (iterator.hasNext()) {
beacon = iterator.next();
L.object(beacon);
entity.setId(null);
entity.setUuid(beacon.getId1().toString());
entity.setMajor(beacon.getId2().toString());
entity.setMinor(beacon.getId3().toString());
entity.setTxpower(beacon.getTxPower());
entity.setTime(Utils.getCurrentTime());
dbHelper.provideNinjaDao().insert(entity);
Log.d(TAG, "sql save success");
}
}
private Notification getNotification() {
CharSequence text = getText(R.string.notify_service_started);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, MainActivity.class), 0);
Notification notification = new Notification.Builder(this)
.setSmallIcon(R.mipmap.ninja_turtle)
.setTicker(text)
.setWhen(System.currentTimeMillis())
.setContentTitle(getText(R.string.info_service))
.setContentText(text)
.setContentIntent(contentIntent)
.build();
return notification;
}
}
希望你们能帮助我。提前致谢。