我正在尝试构建一个远程控制Android应用，并且无法正常使用网络。这些命令在一个单独的线程中发送，使用HTTP（okhttp3）延迟大约100 ms（加上发送）。
问题是应用程序有时会冻结像logcat这样的传输打印：
03-29 02:18:31.249 25191-25191/com.example.control D/CommandSender: http://192.168.1.185/drive?m1s=988&m2s=927&dir=ff s: 6557 f: 0
03-29 02:18:31.259 25191-25191/com.example.control D/CommandSender: http://192.168.1.185/drive?m1s=988&m2s=952&dir=ff s: 6557 f: 0
03-29 02:18:31.489 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 02:18:32.060 505-600/? D/Tethering: TetherModeAliveState.processMessage what=4
03-29 02:18:32.060 505-600/? D/Tethering: renewing mobile connection - requeuing for another 40000ms
03-29 02:18:32.060 505-600/? D/ConnectivityService: startUsingNetworkFeature for net 0: enableDUN by 505/1000
03-29 02:18:32.060 505-600/? D/ConnectivityService: Disconnect 4 in 60000ms
03-29 02:18:32.060 505-600/? D/ConnectivityService: reconnecting to special network 4
03-29 02:18:32.060 505-598/? D/ConnectivityService: issue reconnect to special network:4
03-29 02:18:32.060 505-598/? D/MobileDataStateTracker: dun: setTeardownRequested(false)
03-29 02:18:32.430 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 02:18:32.931 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 02:18:33.442 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 02:18:34.352 25191-25191/com.example.control D/CommandSender: http://192.168.1.185/drive?m1s=988&m2s=964&dir=ff s: 6558 f: 0
其中s: value是成功次数，f: value是失败次数。注意CommandSender日志行之间的3s延迟。冻结期间另一种典型的消息类型是GC。
我测试过的两款设备都表现出类似的行为（HTC One S和Alcatel Idol 3，在硬件和软件方面几乎没有任何共同点。）
同时，使用来自同一设备上的浏览器的JavaScript页面发送请求时，不会出现冻结或其他通信问题，而请求期间可能只有25毫秒。
发送请求的代码：
/*
* In activity
*/
private CommandSender sender;
private Thread connectionThread;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.control);
// setting up other elements
sender = new CommandSender (ipString, this) {
@Override
protected void onSuccess () {}
@Override
protected void onFailure () {
Toast.makeText (ControlActivity.this, R.string.cmd_send_failure, Toast.LENGTH_SHORT)
.show ();
}
};
}
@Override
protected void onResume () {
super.onResume ();
connectionThread = new Thread(new Runnable() {
public void run() {
while (true) {
try {
sender.send (s1value, s2value); // slider values
Thread.sleep(100);
} catch (InterruptedException e) {
return;
}
}
}
});
connectionThread.start ();
}
/*
* In CommandSender.java
*/
abstract class CommandSender
{
private final String address; // ip string
private final OkHttpClient client = new OkHttpClient();
private final WeakReference<Activity> activity;
private int successCounter = 0;
private int failureCounter = 0;
public CommandSender (String address, Activity activity) {
this.address = address;
this.activity = new WeakReference<> (activity);
}
public void send (int m1speed, int m2speed) {
String url = formUrl (address, m1speed, m2speed);
Request request = new Request.Builder ().url (url).build ();
client.newCall(request).enqueue(new Callback () {
@Override
public void onFailure (Call c, IOException e) {
activity.get ().runOnUiThread (new Runnable () {
@Override
public void run () {
CommandSender.this.onFailure ();
}
});
failureCounter++;
}
@Override
public void onResponse (Call c, Response response) throws IOException {
successCounter++;
if (!response.isSuccessful ())
throw new IOException ("Unexpected code " + response);
activity.get ().runOnUiThread (new Runnable () {
@Override
public void run () {
Log.d ("CommandSender", url + " s: " + successCounter + " f: " + failureCounter);
CommandSender.this.onSuccess ();
}
});
}
});
}
private static String formUrl (String address, int m1speed, int m2speed)
{
// do it
}
abstract protected void onSuccess ();
abstract protected void onFailure ();
}
考虑到浏览器没有连接问题，我在这里做错了。那有什么不对？
UPD1：
它肯定与系统任务有关。无论如何，okhttp3被中断是很奇怪的，例如，浏览器没有
这种情况的另一个日志（12秒冻结！）：
03-29 08:34:17.898 21167-21167/com.example.control D/CommandSender: http://192.168.1.185/drive?m1s=801&m2s=805&dir=ff s: 204 f: 3
03-29 08:34:18.108 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:18.379 21167-21167/com.example.control D/CommandSender: http://192.168.1.185/drive?m1s=732&m2s=919&dir=ff s: 205 f: 3
03-29 08:34:18.619 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:18.919 21167-21167/com.example.control D/CommandSender: http://192.168.1.185/drive?m1s=769&m2s=927&dir=ff s: 206 f: 3
03-29 08:34:19.210 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:19.740 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:20.291 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:20.451 505-919/? D/Process: killProcessQuiet, pid=9971
03-29 08:34:20.451 505-919/? I/ActivityManager: No longer want com.maxmpz.audioplayer (pid 9971): hidden #16, adj=15
03-29 08:34:20.461 505-919/? D/Process: dalvik.system.VMStack.getThreadStackTrace(Native Method)
03-29 08:34:20.461 505-919/? D/Process: java.lang.Thread.getStackTrace(Thread.java:599)
03-29 08:34:20.461 505-919/? D/Process: android.os.Process.killProcessQuiet(Process.java:837)
03-29 08:34:20.461 505-919/? D/Process: com.android.server.am.ActivityManagerService.updateOomAdjLocked(ActivityManagerService.java:15735)
03-29 08:34:20.461 505-919/? D/Process: com.android.server.am.ActivityManagerService.setProcessForeground(ActivityManagerService.java:5041)
03-29 08:34:20.461 505-919/? D/Process: com.android.server.NotificationManagerService.keepProcessAliveLocked(NotificationManagerService.java:750)
03-29 08:34:20.461 505-919/? D/Process: com.android.server.NotificationManagerService.enqueueToast(NotificationManagerService.java:619)
03-29 08:34:20.461 505-919/? D/Process: android.app.INotificationManager$Stub.onTransact(INotificationManager.java:104)
03-29 08:34:20.461 505-919/? D/Process: android.os.Binder.execTransact(Binder.java:338)
03-29 08:34:20.461 505-919/? D/Process: dalvik.system.NativeStart.run(Native Method)
03-29 08:34:20.491 209-7892/? D/memalloc: ion: Allocated buffer base:0x41cb5000 size:147456 fd:38
03-29 08:34:20.491 21167-21167/com.example.control D/memalloc: ion: Mapped buffer base:0x52fe5000 size:147456 offset:0 fd:99
03-29 08:34:20.511 209-277/? I/Adreno200-EGLSUB: <CreateImage:897>: Android Image
03-29 08:34:20.511 209-277/? I/Adreno200-EGLSUB: <GetImageAttributes:1106>: RGBA_8888
03-29 08:34:20.521 890-890/? D/dalvikvm: GC_FOR_ALLOC freed 1160K, 36% free 5526K/8611K, paused 41ms
03-29 08:34:20.541 505-763/? W/ContentService: binderDied() at ObserverNode
03-29 08:34:20.541 505-763/? W/ActivityManager: Scheduling restart of crashed service com.maxmpz.audioplayer/.player.HeadsetMicroService in 5000ms
03-29 08:34:20.571 902-902/? I/PreJBNotificationService: onAccessibilityEvent
03-29 08:34:20.911 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:21.432 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:22.103 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:22.463 21167-21167/com.example.control D/memalloc: ion: Unmapping buffer base:0x52fe5000 size:147456
03-29 08:34:22.503 209-7961/? D/memalloc: ion: Allocated buffer base:0x41e02000 size:147456 fd:66
03-29 08:34:22.503 21167-21167/com.example.control D/memalloc: ion: Mapped buffer base:0x52fe5000 size:147456 offset:0 fd:99
03-29 08:34:22.513 209-277/? D/memalloc: ion: Freeing buffer base:0x41cb5000 size:147456 fd:38
03-29 08:34:22.513 209-277/? D/memalloc: ion: Unmapping buffer base:0x41cb5000 size:147456
03-29 08:34:22.513 209-277/? I/Adreno200-EGLSUB: <CreateImage:897>: Android Image
03-29 08:34:22.513 209-277/? I/Adreno200-EGLSUB: <GetImageAttributes:1106>: RGBA_8888
03-29 08:34:22.533 890-890/? D/dalvikvm: GC_FOR_ALLOC freed 1158K, 36% free 5526K/8611K, paused 51ms
03-29 08:34:22.563 902-902/? I/PreJBNotificationService: onAccessibilityEvent
03-29 08:34:22.603 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:23.004 505-543/? D/BatteryService: updateBatteryStats ======================================
03-29 08:34:23.134 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:23.154 505-557/? D/BatteryService: UEvent updateBatteryStats
03-29 08:34:23.164 505-543/? D/HtcPowerSaver: Recived battery changed intent.
03-29 08:34:23.164 505-543/? D/UsbnetService: BroadcastReceiver::onReceive+
03-29 08:34:23.164 505-543/? D/UsbnetService: onReceive BATTERY_CHANGED
03-29 08:34:23.164 505-543/? D/UsbnetService: --> pluggedType = 2, mPluggedType = 0, mScreenOff = false
03-29 08:34:23.164 505-543/? D/UsbnetService: BroadcastReceiver::onReceive-
03-29 08:34:23.164 505-543/? D/HtcPowerSaver: Checking...
03-29 08:34:23.164 505-543/? I/HtcPowerSaver: >> updateStatus
03-29 08:34:23.164 505-543/? I/HtcPowerSaver: currentStatus=8000, currentLevel=93, enableLevel=20, enable=false, popDialog=false, statusChangeTo=-1
03-29 08:34:23.164 505-543/? I/HtcPowerSaver: << updateStatus
03-29 08:34:23.164 505-557/? D/PackageManager: Failed to get PackageInfo!, pkg:com.htc.demoflorebooter, flags:1
03-29 08:34:23.164 647-647/? D/StatusBar.BatteryController: updateBattery level=93 icon=17302788 status=2
03-29 08:34:23.164 647-647/? D/PowerUI: closing low battery warning: level=93
03-29 08:34:23.164 647-647/? D/PowerUI: plugged = true, health = 2, mBatteryLevel = 93, mPluggedBatteryLevel = 91, mLowBatteryWarningLevel2 = 25, mshowLowChargingWarning2 = true
03-29 08:34:23.164 505-543/? D/NotificationService: mIntentReceiver() Intent.ACTION_BATTERY_CHANGED
03-29 08:34:23.164 505-543/? D/PowerManagerService: runHtcPowerSaverCheck ======================================
03-29 08:34:23.634 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:24.285 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:24.465 21167-21167/com.example.control D/memalloc: ion: Unmapping buffer base:0x52fe5000 size:147456
03-29 08:34:24.505 209-277/? D/memalloc: ion: Freeing buffer base:0x41e02000 size:147456 fd:66
03-29 08:34:24.505 209-277/? D/memalloc: ion: Unmapping buffer base:0x41e02000 size:147456
03-29 08:34:24.785 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:25.296 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:25.566 505-544/? I/ActivityManager: Start proc com.maxmpz.audioplayer for service com.maxmpz.audioplayer/.player.HeadsetMicroService: pid=23572 uid=10203 gids={1015, 3003, 3002}
03-29 08:34:25.807 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:25.807 23572-23572/? I/dalvikvm: Could not find method com.maxmpz.audioplayer.Application.getExternalFilesDirs, referenced from method com.maxmpz.audioplayer.Application.ll11
03-29 08:34:25.807 23572-23572/? W/dalvikvm: VFY: unable to resolve virtual method 5688: Lcom/maxmpz/audioplayer/Application;.getExternalFilesDirs (Ljava/lang/String;)[Ljava/io/File;
03-29 08:34:25.807 23572-23572/? D/dalvikvm: VFY: replacing opcode 0x6e at 0x002e
03-29 08:34:25.827 23572-23572/? W/audioplayer.Application: Detected NEON support
03-29 08:34:25.827 23572-23572/? W/audioplayer.Application: Detected HTC
03-29 08:34:25.827 23572-23572/? I/dalvikvm: Could not find method android.widget.RemoteViews.setTextViewTextSize, referenced from method com.maxmpz.audioplayer.widgetpackcommon.CommonWidgetProvider.ll1l
03-29 08:34:25.827 23572-23572/? W/dalvikvm: VFY: unable to resolve virtual method 4565: Landroid/widget/RemoteViews;.setTextViewTextSize (IIF)V
03-29 08:34:25.827 23572-23572/? D/dalvikvm: VFY: replacing opcode 0x6e at 0x0007
03-29 08:34:25.827 23572-23572/? W/audioplayer.Application: htcSenseVersion=400
03-29 08:34:25.837 23572-23572/? I/audioplayer.Application: man=HTC pro=ville mod=HTC One S dev=ville type=user board=MSM8960 rel=4.0.4 osVersion=3.0.8-01575-gdcba118
03-29 08:34:25.837 23572-23572/? W/audioplayer.Application: Poweramp edition: arm-play
03-29 08:34:25.837 23572-23572/? I/ActivityThread: Pub com.maxmpz.audioplayer.data: com.maxmpz.audioplayer.rest.RestProvider
03-29 08:34:25.837 23572-23572/? W/audioplayer.Application: tab=false screenSize=2 dpi=240 den=1.5 swdp=360 w/h=540x960
03-29 08:34:25.887 212-212/? D/AudioFlinger: no match values for active_ap
03-29 08:34:25.887 212-212/? E/AudioHardwareALSA: unsupported AP: Music
03-29 08:34:25.887 212-455/? D/AudioFlinger: no match values for active_ap
03-29 08:34:25.887 212-455/? E/AudioHardwareALSA: unsupported AP: Music
03-29 08:34:25.887 212-30925/? D/AudioFlinger: no match values for active_ap
03-29 08:34:25.887 212-30925/? E/AudioHardwareALSA: unsupported AP: Music
03-29 08:34:26.287 647-647/? D/PhoneStatusBarPolicy: isCdma=false hasService=true mSimState=UNKNOWN gprsState=1 mDataState=0 dataActivity=3 htcModemLinkOn=false hspa=true
03-29 08:34:26.327 505-569/? I/PowerManagerService-JNI: [Stability] PowerManagerService_userActivity JNI pass power key event to PowerManagerService userActivity()
03-29 08:34:27.198 16321-16321/? I/hostapd: wlan0: AP-STA-CONNECTED 68:5d:43:da:ef:62
03-29 08:34:27.198 16321-16321/? I/hostapd: station join 68:5D:43:DA:EF:62
03-29 08:34:27.198 505-16290/? I/hostapd: handle event, recv=(<3>AP-STA-CONNECTED 68:5d:43:da:ef:62,37), result=0
03-29 08:34:27.198 505-16290/? I/hostapd: handle event: result=0 nread=37 string="<3>AP-STA-CONNECTED 68:5d:43:da:ef:62"
03-29 08:34:27.208 505-16290/? D/SoftapMonitor: received event=3, STA_JOIN
03-29 08:34:27.208 505-16290/? I/hostapd: Handle event.........
03-29 08:34:27.208 206-264/? D/QCSDK-: CMD INPUT
03-29 08:34:27.208 505-591/? D/Tethering: [isWifi] getHotspotEnabled: true
03-29 08:34:27.208 505-591/? D/WifiStateMachine: WiFiDisplay: getWifidisplayApEnabled=false
03-29 08:34:27.208 505-591/? D/WifiStateMachine: WiFiDisplay: getWifidisplayApEnabled=false
03-29 08:34:27.208 505-591/? D/Tethering: [isWifi] getWifidisplayApEnabled: false
03-29 08:34:27.208 505-591/? D/Tethering: [isWifi] iface: wlan0 && wifi.softap.interface: wlan0
03-29 08:34:27.208 505-591/? D/Tethering: interfaceStatusChanged wlan0, true
03-29 08:34:27.218 206-264/? D/QCSDK-: CMD OUTPUT [success sta_mac_list=5C:CF:7F:D5:07:EA 68:5D:43:DA:EF:62] len :56
03-29 08:34:27.218 505-596/? D/WifiStateMachine: cancel SoftAP sleep policy: mUser=2, syncGetWifiApState=13
03-29 08:34:27.218 505-596/? E/NetworkManagementService: DEBUG softap getassoclist: 2|5C:CF:7F:D5:07:EA,68:5D:43:DA:EF:62,
03-29 08:34:27.218 505-596/? D/WifiStateMachine: SoftAP update assoc list: mUser=2
03-29 08:34:27.228 505-600/? D/Tethering: >>>>>>receive ASSOC_LIST_CHANGE_ACTION<<<<<<
03-29 08:34:27.228 505-600/? D/WifiStateMachine: WiFiDisplay: getWifidisplayApEnabled=false
03-29 08:34:27.228 505-600/? D/WifiStateMachine: WiFiDisplay: getWifidisplayApEnabled=false
03-29 08:34:27.228 505-600/? D/Tethering: showTetheredNotification: 17303460
03-29 08:34:27.228 206-264/? D/QCSDK-: CMD INPUT
03-29 08:34:27.228 206-264/? D/QCSDK-: CMD OUTPUT [success sta_mac_list=5C:CF:7F:D5:07:EA 68:5D:43:DA:EF:62] len :56
03-29 08:34:27.228 505-600/? E/NetworkManagementService: DEBUG softap getassoclist: 2|5C:CF:7F:D5:07:EA,68:5D:43:DA:EF:62,
03-29 08:34:27.238 505-600/? D/Tethering: icon change: 17303460 -> 17303460
03-29 08:34:27.288 16330-16330/? I/dnsmasq: DHCPREQUEST(wlan0) 192.168.1.157 68:5d:43:da:ef:62
03-29 08:34:27.288 16330-16330/? I/dnsmasq: DHCPACK(wlan0) 192.168.1.157 68:5d:43:da:ef:62 AsusU32VJ
03-29 08:34:27.368 902-902/? I/PreJBNotificationService: onAccessibilityEvent
03-29 08:34:27.368 902-902/? I/PreJBNotificationService: ticker: подключенных пользователей: 2
03-29 08:34:27.368 902-902/? I/PreJBNotificationService: icon: 17303460
03-29 08:34:27.368 902-902/? I/PreJBNotificationService: package: android
03-29 08:34:27.368 902-902/? I/PreJBNotificationService: Ongoing notification, returning
03-29 08:34:30.572 21167-21167/com.example.control D/CommandSender: http://192.168.1.185/drive?m1s=602&m2s=988&dir=ff s: 207 f: 5