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chipweinberger / flutter_blue_plus

Flutter plugin for connecting and communicationg with Bluetooth Low Energy devices, on Android, iOS, macOS
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[Help]: Background Bluetooth search, no response when the app is opened #941

Closed gaogaogoo closed 4 months ago

gaogaogoo commented 4 months ago

Requirements

Have you checked this problem on the example app?

No

FlutterBluePlus Version

1.32.8

Flutter Version

3.19.6

What OS?

Android

OS Version

14

Bluetooth Module

none

What is your problem?

Here, my test phone is an OPPO K12 5G. The steps are as follows:

  1. Open the app and start Bluetooth scanning.
  2. Send the app to the background and lock the screen.
  3. Wait for 1-2 hours and then reopen the app from the background.
  4. The app becomes unresponsive, and after a few seconds, the system kills the app automatically.

After encountering this issue, I exported two ANR logs from the phone. Could you please help me check the problem?

Logs

The first log is as follows:
Build fingerprint: 'OPPO/PJR110/OP5A15L1:14/TP1A.220905.001/U.1863da6_1-45fc:user/release-keys'
ABI: 'arm64'
Build type: optimized
suspend all histogram:  Sum: 6.967ms 99% C.I. 0.426us-2207.999us Avg: 102.455us Max: 2705us
DALVIK THREADS (32):
"main" prio=5 tid=1 Runnable
  | group="main" sCount=0 ucsCount=0 flags=0 obj=0x724dff88 self=0xb400007150610800
  | sysTid=2735 nice=-10 cgrp=top-app sched=0/0 handle=0x72036ce500
  | state=R schedstat=( 15358415690 412825335 7450 ) utm=1444 stm=91 core=6 HZ=100
  | stack=0x7fdf9dd000-0x7fdf9df000 stackSize=8188KB
  | held mutexes= "mutator lock"(shared held)
  at android.os.MessageQueue.enqueueMessage(MessageQueue.java:629)
  - locked <0x057d113b> (a android.os.MessageQueue)
  at android.os.Handler.enqueueMessage(Handler.java:786)
  at android.os.Handler.sendMessageAtTime(Handler.java:735)
  at android.os.Handler.sendMessageDelayed(Handler.java:705)
  at android.os.Handler.post(Handler.java:435)
  at com.lib.flutter_blue_plus.FlutterBluePlusPlugin.invokeMethodUIThread(FlutterBluePlusPlugin.java:2684)
  at com.lib.flutter_blue_plus.FlutterBluePlusPlugin.access$500(FlutterBluePlusPlugin.java:78)
  at com.lib.flutter_blue_plus.FlutterBluePlusPlugin$3.onScanResult(FlutterBluePlusPlugin.java:2045)
  at android.bluetooth.le.BluetoothLeScanner$BleScanCallbackWrapper$1.run(BluetoothLeScanner.java:577)
  at android.os.Handler.handleCallback(Handler.java:958)
  at android.os.Handler.dispatchMessage(Handler.java:99)
  at android.os.Looper.loopOnce(Looper.java:257)
  at android.os.Looper.loop(Looper.java:368)
  at android.app.ActivityThread.main(ActivityThread.java:8848)
  at java.lang.reflect.Method.invoke(Native method)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:572)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049)

The second log is as follows:
Build fingerprint: 'OPPO/PJR110/OP5A15L1:14/TP1A.220905.001/U.1863da6_1-45fc:user/release-keys'
ABI: 'arm64'
Build type: optimized
suspend all histogram:  Sum: 5.140ms 99% C.I. 0.222us-1245.759us Avg: 65.897us Max: 1406us
DALVIK THREADS (33):
"main" prio=5 tid=1 Runnable
  | group="main" sCount=0 ucsCount=0 flags=0 obj=0x724dff88 self=0xb400007150610800
  | sysTid=19079 nice=-10 cgrp=top-app sched=0/0 handle=0x72036ce500
  | state=R schedstat=( 17744349814 241346868 9378 ) utm=1661 stm=112 core=7 HZ=100
  | stack=0x7fdf9dd000-0x7fdf9df000 stackSize=8188KB
  | held mutexes= "mutator lock"(shared held)
  at java.lang.Integer.parseInt(Integer.java:757)
  at java.lang.Integer.parseInt(Integer.java:915)
  at java.util.Formatter$FormatSpecifier.width(Formatter.java:2910)
  at java.util.Formatter$FormatSpecifier.<init>(Formatter.java:2962)
  at java.util.Formatter$FormatSpecifierParser.<init>(Formatter.java:2778)
  at java.util.Formatter.parse(Formatter.java:2711)
  at java.util.Formatter.format(Formatter.java:2660)
  at java.util.Formatter.format(Formatter.java:2614)
  at java.lang.String.format(String.java:4017)
  at com.lib.flutter_blue_plus.FlutterBluePlusPlugin.bytesToHex(FlutterBluePlusPlugin.java:2725)
  at com.lib.flutter_blue_plus.FlutterBluePlusPlugin.access$900(FlutterBluePlusPlugin.java:78)
  at com.lib.flutter_blue_plus.FlutterBluePlusPlugin$3.onScanResult(FlutterBluePlusPlugin.java:2014)
  at android.bluetooth.le.BluetoothLeScanner$BleScanCallbackWrapper$1.run(BluetoothLeScanner.java:577)
  at android.os.Handler.handleCallback(Handler.java:958)
  at android.os.Handler.dispatchMessage(Handler.java:99)
  at android.os.Looper.loopOnce(Looper.java:257)
  at android.os.Looper.loop(Looper.java:368)
  at android.app.ActivityThread.main(ActivityThread.java:8848)
  at java.lang.reflect.Method.invoke(Native method)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:572)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049)
chipweinberger commented 4 months ago

maybe there are many thousands of scan results so bytesToHex is taking too long to run?

youll need to modify FBP

chipweinberger commented 4 months ago

use this code. it's faster.

private static String bytesToHex(byte[] bytes) {
    if (bytes == null) {
        return "";
    }
    StringBuilder sb = new StringBuilder(bytes.length * 2);
    for (byte b : bytes) {
        sb.append(Character.forDigit((b >> 4) & 0xF, 16));
        sb.append(Character.forDigit(b & 0xF, 16));
    }
    return sb.toString();
}
gaogaogoo commented 4 months ago

use this code. it's faster.

private static String bytesToHex(byte[] bytes) {
    if (bytes == null) {
        return "";
    }
    StringBuilder sb = new StringBuilder(bytes.length * 2);
    for (byte b : bytes) {
        sb.append(Character.forDigit((b >> 4) & 0xF, 16));
        sb.append(Character.forDigit(b & 0xF, 16));
    }
    return sb.toString();
}

Thank you for your reply. After using this code, I still encountered ANR errors. The error is as follows:

Build fingerprint: 'OPPO/PJR110/OP5A15L1:14/TP1A.220905.001/U.1863da6_1-45fc:user/release-keys' ABI: 'arm64' Build type: optimized suspend all histogram: Sum: 5.862ms 99% C.I. 0.426us-2247.680us Avg: 112.730us Max: 2865us DALVIK THREADS (37): "main" prio=5 tid=1 TimedWaiting | group="main" sCount=1 ucsCount=0 flags=1 obj=0x724dff88 self=0xb400007150610800 | sysTid=17911 nice=-10 cgrp=top-app sched=0/0 handle=0x72036ce500 | state=S schedstat=( 16504636957 964614829 13725 ) utm=1453 stm=197 core=4 HZ=100 | stack=0x7fdf9dd000-0x7fdf9df000 stackSize=8188KB | held mutexes= at jdk.internal.misc.Unsafe.park(Native method)

chipweinberger commented 4 months ago

this seems like a bug in android.

we can't fix it afaict.

reopen the issue if you have futher information