用于debug，测试黑色设备异常扫码阻塞的问题

app/build.gradle

@@ -7,8 +7,8 @@ android {
         applicationId "com.bgycc.smartcanteen"
         minSdkVersion 22
         targetSdkVersion 30
-        versionCode 141
-        versionName "1.4.1"
+        versionCode 143
+        versionName "1.4.3"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         ndk {
             abiFilters "armeabi", "armeabi-v7a", "x86", "mips"

app/src/main/java/com/bgycc/smartcanteen/qrcode/DefaultQRCodeScan.java

@@ -41,10 +41,14 @@ public class DefaultQRCodeScan implements IQRCodeScan {
         while (buf == null || !end(buf)) {
             byte[] b = new byte[64];
             int l = serialPortIS.read(b);
-            if (l == 0) break;
+            if (l == 0) {
+                LogUtils.w(TAG, "扫码枪异常");
+                break;
+            }
             b = Arrays.copyOfRange(b, 0, l);
             buf = merge(buf, b);
             len += l;
+            LogUtils.d(TAG, "扫码枪结果: " + (buf != null ? Arrays.toString(buf) : "empty"));
         }
 
         String str = null;

app/src/main/java/com/bgycc/smartcanteen/utils/NetworkUtils.java

@@ -218,7 +218,6 @@ public class NetworkUtils {
     private static void requestEthernet(ConnectivityManager.NetworkCallback callback) {
         NetworkRequest request = new NetworkRequest.Builder()
                 .addTransportType(NetworkCapabilities.TRANSPORT_ETHERNET)
-                .removeTransportType(NetworkCapabilities.TRANSPORT_WIFI)
                 .build();
         connectivityManager.requestNetwork(request, callback);
     }
@@ -230,7 +229,6 @@ public class NetworkUtils {
         }
         NetworkRequest request = new NetworkRequest.Builder()
                 .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
-                .removeTransportType(NetworkCapabilities.TRANSPORT_ETHERNET)
                 .build();
         connectivityManager.requestNetwork(request, callback);
     }

app/src/main/java/com/bgycc/smartcanteen/viewModel/QRCodeViewModel.java

@@ -70,14 +70,14 @@ public class QRCodeViewModel extends ViewModel {
         if (scan == null) return;
         if (scanFuture == null || scanFuture.isDone()) {
             scanFuture = SCTaskExecutor.getInstance().schedule(scanRunnable, DELAY, TimeUnit.MILLISECONDS);
+        } else {
+            LogUtils.w(TAG, "当前已有扫码任务");
         }
     }
 
     private Runnable scanRunnable = () -> {
         qrCodeState.postValue(new QRCodeState(QRCodeState.IDLE));
         LogUtils.i(TAG, "开始扫描二维码");
-        while (!scan.available()) {}
-        qrCodeState.postValue(new QRCodeState(QRCodeState.SCANNING));
         // 读取串口扫描的二维码数据
         String scanData;
         try {