前台服务意外停止

Question

我正在android中创建一个长期运行的前台服务。我的服务运行了一段时间，然后突然停止。我的服务几乎在其工作的每一步都记录信息。下面是在我的服务停止的最后一个日志之后的logcat (第一个详细的条目是我的服务创建的最后一个日志)：

08-14 01:21:09.232 V/Screen Checking(30000): Bitmaps created sameAs check should be happening now
08-14 01:21:09.592 D/WifiStateMachine(  845): handleMessage: E msg.what=131155
08-14 01:21:09.592 D/WifiStateMachine(  845): processMsg: ConnectedState
08-14 01:21:09.592 D/WifiStateMachine(  845): processMsg: L2ConnectedState
08-14 01:21:09.592 D/WifiNative-wlan0(  845): doString: SIGNAL_POLL
08-14 01:21:09.602 D/WifiStateMachine(  845): handleMessage: X
08-14 01:21:09.912 I/Vold    (  391): [LGE][VOLD][NetlinkHandler.cpp][onEvent()] subsys:cpu, action:0
08-14 01:21:09.932 D/BubblePopupHelper( 1155): isShowingBubblePopup : false
08-14 01:21:10.662 I/ThermalEngine(  412): Sensor:pa_therm0:39000 mC
08-14 01:21:10.722 D/libc    (  396): _dns_getaddrinfo: iptype =1
08-14 01:21:10.732 D/libc    (  396): _dns_getaddrinfo: query_ipv4=1, query_ipv6=0
08-14 01:21:10.992 E/Parcel  (  466): Reading a NULL string not supported here.
08-14 01:21:10.992 E/Parcel  (  466): Reading a NULL string not supported here.
08-14 01:21:10.992 E/Parcel  (  466): Reading a NULL string not supported here.
08-14 01:21:10.992 E/Parcel  (  466): Reading a NULL string not supported here.
08-14 01:21:11.002 D/PhoneApp( 1479): getIsInUseVoLTE : false
08-14 01:21:11.012 D/PhoneApp( 1479): getIsInUseVoLTE : false
08-14 01:21:11.022 V/LGATCMDService( 1247): onSignalStrengthsChanged signalStrength=SignalStrength: 99 0 -93 -115 -88 -75 3 99 2147483647 2147483647 2147483647 2147483647 2147483647 cdma 8 level=4
08-14 01:21:11.022 D/PhoneApp( 1479): getIsInUseVoLTE : false
08-14 01:21:11.032 D/PhoneApp( 1479): getIsInUseVoLTE : false
08-14 01:21:11.042 D/PhoneApp( 1479): getIsInUseVoLTE : false
08-14 01:21:11.042 V/LGATCMDService( 1247): broadcastRssiInfo() - Start RSSI : -93 ECIO : -115
08-14 01:21:11.062 V/TelephonyAutoProfiling(31998): [getValue] FEATURE key : lgu_lte_single_device, value : null
08-14 01:21:11.062 D/BubblePopupHelper( 1155): isShowingBubblePopup : false
08-14 01:21:11.062 D/PhoneApp( 1479): getIsInUseVoLTE : false
08-14 01:21:11.062 D/PhoneInterfaceManager( 1479): [PhoneIntfMgr] sigLevel = 4
08-14 01:21:11.062 D/PhoneApp( 1479): getIsInUseVoLTE : false
08-14 01:21:11.102 I/Vold    (  391): [LGE][VOLD][NetlinkHandler.cpp][onEvent()] subsys:cpu, action:0
08-14 01:21:11.312 I/Vold    (  391): [LGE][VOLD][NetlinkHandler.cpp][onEvent()] subsys:cpu, action:0
08-14 01:21:11.902 V/AudioFlinger(  405): Audio hardware entering standby, mixer 0xb5196008, suspend count 0
08-14 01:21:11.902 V/audio_hw_primary(  405): out_standby: enter: usecase(0: deep-buffer-playback)
08-14 01:21:12.192 V/audio_hw_primary(  405): stop_output_stream: enter: usecase(0: deep-buffer-playback)
08-14 01:21:12.192 V/audio_hw_primary(  405): disable_audio_route: enter: usecase(0)
08-14 01:21:12.192 V/audio_hw_primary(  405): disable_audio_route: reset mixer path: deep-buffer-playback
08-14 01:21:12.192 V/audio_hw_primary(  405): disable_audio_route: exit
08-14 01:21:12.192 D/hardware_info(  405): hw_info_append_hw_type : device_name = speaker
08-14 01:21:12.192 V/audio_hw_primary(  405): disable_snd_device: snd_device(2: speaker)
08-14 01:21:12.212 V/audio_hw_primary(  405): stop_output_stream: exit: status(0)
08-14 01:21:12.212 V/audio_hw_primary(  405): out_standby: exit
08-14 01:21:12.212 V/AudioFlinger(  405): releaseWakeLock_l() AudioOut_2
08-14 01:21:12.212 V/AudioFlinger(  405): thread 0xb5196008 type 0 TID 663 going to sleep
08-14 01:21:12.602 D/WifiStateMachine(  845): handleMessage: E msg.what=131155
08-14 01:21:12.602 D/WifiStateMachine(  845): processMsg: ConnectedState
08-14 01:21:12.602 D/WifiStateMachine(  845): processMsg: L2ConnectedState
08-14 01:21:12.602 D/WifiNative-wlan0(  845): doString: SIGNAL_POLL
08-14 01:21:12.632 D/WifiStateMachine(  845): handleMessage: X
08-14 01:21:12.952 D/BubblePopupHelper( 1155): isShowingBubblePopup : false
08-14 01:21:13.952 D/BubblePopupHelper( 1155): isShowingBubblePopup : false
08-14 01:21:15.642 D/WifiStateMachine(  845): handleMessage: E msg.what=131155
08-14 01:21:15.642 D/WifiStateMachine(  845): processMsg: ConnectedState
08-14 01:21:15.642 D/WifiStateMachine(  845): processMsg: L2ConnectedState
08-14 01:21:15.642 D/WifiNative-wlan0(  845): doString: SIGNAL_POLL
08-14 01:21:15.662 D/WifiStateMachine(  845): handleMessage: X
08-14 01:21:15.662 I/ThermalEngine(  412): Sensor:pa_therm0:39000 mC
08-14 01:21:15.962 D/BubblePopupHelper( 1155): isShowingBubblePopup : false
08-14 01:21:16.972 D/BubblePopupHelper( 1155): isShowingBubblePopup : false
08-14 01:21:18.032 I/LiveRailSDK-101(29678): LiveRail init SDK version 2.4.0
08-14 01:21:18.032 V/LiveRailSDK-101(29678): Adapters not included
08-14 01:21:18.032 I/LiveRailSDK-101(29678): >> setDebug(false)
08-14 01:21:18.032 I/LiveRailSDK-101(29678): AdView attached to window
08-14 01:21:18.032 I/LiveRailSDK-101(29678): >> initAd()
08-14 01:21:18.042 V/LiveRailSDK-101(29678): cleanup
08-14 01:21:18.062 V/LiveRailSDK-101(29678): onSizeChanged() w=800 h=480 from oldw=0 oldh=0
08-14 01:21:18.092 V/LiveRailSDK-101(29678): Ingest Run-time Parameters
08-14 01:21:18.092 V/LiveRailSDK-101(29678): Found wifi connection LR_CONNECTIONTYPE=2
08-14 01:21:18.102 D/LiveRailSDK-101(29678): Created new SLOT based inventory pod
08-14 01:21:18.102 D/LiveRailSDK-101(29678): Pod position set to: 1
08-14 01:21:18.102 I/LiveRailSDK-101(29678): Instantiated new inventory pod slot:com.liverail.library.inventory.c@42ff57a8
08-14 01:21:18.112 V/LiveRailSDK-101(29678): Delivery url=http://ad4.liverail.com/
08-14 01:21:18.112 V/LiveRailSDK-101(29678): CookieStore contains 312 cookies.
08-14 01:21:18.112 V/LiveRailSDK-101(29678): Delivery timeout=10000 user-agent: Mozilla/5.0 (Linux; Android; Device) LiveRailSDK/2.4.0 (AB/com.juteralabs.perktv;AV/2.6.2;BV/65)
08-14 01:21:18.112 D/LiveRailSDK-101(29678): Delivery Run-time Parameters:
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_ADMAP=in::0
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_ADTYPE=3
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_ADUNIT=in
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_APPBUILD=65
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_APPNAME=Perk TV
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_APPVERS=2.6.2
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_BUNDLE=com.juteralabs.perktv
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_CARRIER=Chameleon
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_CONNECTIONTYPE=2
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_DEVICEID=6B37D6B834B51A08AC72F06522849AEA72362D72
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_DURATION=33
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_FORMAT=video/mp4;video/3gpp;video/webm
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_HEIGHT=480
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_IDFA=ae34a5b4-ed8a-4d82-8522-60059042ba4a
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_IDFA_FLAG=1
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_MAKE=LGE
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_MODEL=LGLS620
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_MUTED=1
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_OS=Android
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_OSVERS=4.4.2
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_POD_CURRENT=1
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_PUBLISHER_ID=13955
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_SCHEMA=liverail
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_SDK=android
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_SDK_VERSION=2.4.0
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_TAGS=8675307,livetv
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_VERTICALS=
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_VIDEO_POSITION=0
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_VIEWABLE=1
08-14 01:21:18.112 D/LiveRailSDK-101(29678):    LR_WIDTH=800
08-14 01:21:18.112 D/LiveRailSDK-101(29678): AdManager specific parameters:
08-14 01:21:18.112 D/LiveRailSDK-101(29678): layout(width=800 height=480) volume=0/15

我的服务是从我的活动的onStop方法开始的：

 @Override
protected void onStop() {
    super.onStop();
    mServiceIntent = new Intent(this, Scan.class);
    this.startService(mServiceIntent);
    Log.v("MainActivity", "onStop called startService foregroundService should be starting");

下面是我服务中的一些代码：

public class Scan extends Service {
final int notificationID = 1;
Notification foregroundNotification;
NotificationManager notificationManager;
ExecutorService executorService;
public IBinder onBind(Intent mServiceIntent){return null;}

@Override
public void onCreate(){
startInForeground();
notificationManager = (NotificationManager)                this.getSystemService(Context.NOTIFICATION_SERVICE);
executorService = Executors.newSingleThreadExecutor();
}

@Override
public int onStartCommand( Intent mServiceIntent,int flags, int startId) {
//super.onStartCommand(mServiceIntent, flags, startId);
executorService.execute(new Runnable() {
    public void run() {

        Log.v("Screen Checking", "Runnable successfully called");


        File First_Shot;
        File Second_Shot;
        boolean search = true;


        Bitmap sec;
        Bitmap current;

       try {
            Thread.sleep(30000);
            while (search == true) {


                Process capture = Runtime.getRuntime().exec("su -c screencap -p /storage/external_SD/first.png");
                capture.waitFor();
                Log.v("Screen Checking", "First screenshot taken 10 second wait");
                capture.destroy();
                Thread.sleep(10000);
                Process getit = Runtime.getRuntime().exec("su -c screencap -p /storage/external_SD/second.png");
                getit.waitFor();
                Log.v("Screen Checking", "Second screenshot taken");
                getit.destroy();


                First_Shot = new File("/storage/external_SD/first.png");
                Log.v("Screen Checking", "File Exists and File can be read" + First_Shot.exists() + First_Shot.canRead());
                Second_Shot = new File("/storage/external_SD/second.png");
                Log.v("Screen Checking", "File Exists and File can be read" + Second_Shot.exists() + Second_Shot.canRead());

                current = BitmapFactory.decodeFile("/storage/external_SD/first.png");
                sec = BitmapFactory.decodeFile("/storage/external_SD/second.png");
                Log.v("Screen Checking", "Bitmaps created sameAs check should be happening now");
                if (current.sameAs(sec) == true) {


                    Log.v("Screen Checking", "inside touch if they matched");
Process p = Runtime.getRuntime().exec("su -c input tap 400 314");
p.waitfor;
Log.v("Screen Checking", command successfully executed.")


                } else if (current.getConfig() == sec.getConfig() && current.getHeight() == sec.getHeight() && current.getWidth() == sec.getWidth()) {
                    Log.v("Screen Checking", "inside touch else-if Image Data was not the same");
                } else {
                    Log.v("Screen Checking", "Image Configuration or Dimensions were not the same see logs with the tag 'otherImageData'");
                    Log.v("otherImageData", "Current Config followed by Sec config" + current.getConfig() + sec.getConfig());
                    Log.v("otherImageData", "Current Height followed by Sec height" + current.getHeight() + sec.getHeight());
                    Log.v("otherImageData", "Current Width followed by sec width" + current.getWidth() + sec.getWidth());

                }
            }
        } catch (InterruptedException | IOException e) {
        }
    }
});
Log.v("Screen Checking", "onStartCommand Return just called");



return START_STICKY;
}

@Override
public void onDestroy(){
Log.v("Screen Checking", "onDestroy for the service was called, the executorService has called shutdownNow and super.onDestroy has been called.");
executorService.shutdownNow();
super.onDestroy();
}

void startInForeground(){
int notificationIcon = R.drawable.notificationimage;
String text = "It has begun";
long notificationTimeStamp = System.currentTimeMillis();
foregroundNotification = new Notification(notificationIcon, text, notificationTimeStamp);
String title = "Title";
String body = "Body";
Intent mainActivityIntent = new Intent (this, MainActivity.class);
PendingIntent pendingmainActivityIntent = PendingIntent.getActivity(this, 0, mainActivityIntent, 0);
foregroundNotification.setLatestEventInfo(this, title, body, pendingmainActivityIntent);
startForeground(notificationID, foregroundNotification);


}
  void setStatusText(String statusText){
    foregroundNotification.tickerText = statusText;
    notificationManager.notify(notificationID, foregroundNotification);
}

}

我的活动的onDestroy方法调用stopService，以防stopService--即relevant.How --可以停止这样停止服务吗？此外，对于如何使我的代码更有资源效率或您认为我应该做的任何改进，您有什么建议吗？

Answer 1

为什么要在Activities方法中停止前台服务？如果服务是在onStop中启动的，那么在活动生命周期中调用的下一个服务将是onDestory，从而在不久之后停止您的服务。

删除活动onDestroy中停止服务的代码。

您应该删除服务中的睡眠和循环，转而使用带有延迟启动的Handler。在处理程序代码的末尾，再次以另一个延迟启动处理程序。如果搜索碰巧变成了false，我看不出在哪里，您可以从处理程序中删除runnable。

Answer 2

我猜问题是从调用startInForeground方法的位置开始的。在onStartCommand方法中调用该方法。

文件上说

已启动的服务可以使用startForeground(int，Notification) API将服务置于前台状态，其中系统认为它是用户主动意识到的东西，因此在内存不足时不可能杀死它。(理论上说，在当前前台应用程序的巨大内存压力下，该服务仍然有可能被杀死，但在实践中，这不应该是一个问题。)

请跟随文档链接了解更多细节。也请看一下这个问题的答案

在调用startInForeground方法时，服务尚未启动。它正在被创造。