将设备相关的代码迁移到代理类中，让代码结构更加清晰

app/src/main/java/com/bgycc/smartcanteen/command/UpdateCommandHandler.java

 package com.bgycc.smartcanteen.command;
 
-import android.os.Build;
-
 import com.bgycc.smartcanteen.BuildConfig;
 import com.bgycc.smartcanteen.api.SCRetrofit;
 import com.bgycc.smartcanteen.entity.Command;
 import com.bgycc.smartcanteen.entity.CommandResponse;
 import com.bgycc.smartcanteen.entity.CommandUpdate;
 import com.bgycc.smartcanteen.entity.ProgressResponseBody;
-import com.bgycc.smartcanteen.utils.DangerousUtils;
+import com.bgycc.smartcanteen.utils.DeviceProxy;
 import com.blankj.utilcode.util.AppUtils;
 import com.blankj.utilcode.util.FileIOUtils;
 import com.blankj.utilcode.util.FileUtils;
@@ -85,7 +83,6 @@ public class UpdateCommandHandler extends CommandHandler {
                 .build();
         this.commandUpdate = gson.fromJson(command.getData(), CommandUpdate.class);
         this.updateApk = new File(Utils.getApp().getCacheDir(), UPDATE_APK);
-        FileUtils.delete(updateApk);
     }
 
     private void init(Command command, Gson gson, CommandProgressCallback callback) {
@@ -94,7 +91,6 @@ public class UpdateCommandHandler extends CommandHandler {
         this.commandProgressCallback = callback;
         this.commandUpdate = gson.fromJson(command.getData(), CommandUpdate.class);
         this.updateApk = new File(Utils.getApp().getCacheDir(), UPDATE_APK);
-        FileUtils.delete(updateApk);
     }
 
     @Override
@@ -104,6 +100,7 @@ public class UpdateCommandHandler extends CommandHandler {
             return null;
         }
         start = true;
+        FileUtils.delete(updateApk);
         if (executor == null) {
             executor = Executors.newScheduledThreadPool(1);
         }
@@ -158,12 +155,11 @@ public class UpdateCommandHandler extends CommandHandler {
                 start = false;
                 return;
             }
-            FileIOUtils.writeFileFromIS(updateApk, body.byteStream());
-            LogUtils.d(TAG, "更新包下载成功，开始安装");
+            boolean result = FileIOUtils.writeFileFromIS(updateApk, body.byteStream());
             AppUtils.AppInfo info = AppUtils.getApkInfo(updateApk);
+            LogUtils.d(TAG, "更新包下载: " + (result ? "成功" : "失败") + "，开始安装: " + (info == null ? "null" : info.getPackageName()));
             if (info == null || !info.getPackageName().equals(BuildConfig.APPLICATION_ID)) {
                 FileUtils.delete(updateApk);
-                LogUtils.w(TAG, "更新包包名非法: " + (info == null ? "null" : info.getPackageName()));
                 idle("", 0);
                 start = false;
                 return;
@@ -176,22 +172,10 @@ public class UpdateCommandHandler extends CommandHandler {
                 LogUtils.d(TAG, "不允许安装低版本");
                 failed("不允许安装低版本", 0);
             } else {
-                if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) {
-                    // 6.0以下安装包需要修改权限才能安装
-                    try {
-                        Process p = Runtime.getRuntime().exec("chmod 755 " + updateApk);
-                        p.waitFor();
-                        DangerousUtils.installAppSilent(updateApk);
-                        LogUtils.d(TAG, "开始安装");
-                        success("开始安装", 100);
-                    } catch (Exception e) {
-                        LogUtils.e(TAG, "安装文件权限修改失败");
-                        failed("安装文件权限修改失败", 0);
-                    }
-                } else {
-                    DangerousUtils.installAppSilent(updateApk);
-                    LogUtils.d(TAG, "开始安装");
+                if (DeviceProxy.updateApp(updateApk)) {
                     success("开始安装", 100);
+                } else {
+                    failed("安装文件权限修改失败", 0);
                 }
             }
             try {

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

@@ -2,17 +2,16 @@ package com.bgycc.smartcanteen.qrcode;
 
 import android.os.Build;
 
-public class QRCodeScanFactory {
-    private static final String TPS = "TPS";
-    private static final String QUAD = "QUAD";
+import com.bgycc.smartcanteen.utils.DeviceProxy;
 
+public class QRCodeScanFactory {
     private static final String TPS_PORT = "/dev/ttyS0";
     private static final String QUAD_PORT = "/dev/ttyS6";
     public static IQRCodeScan create() throws Exception {
         String model = Build.MODEL;
-        if (model.contains(TPS)) {
+        if (model.contains(DeviceProxy.DEVICE_MODEL_TPS)) {
             return new TPS(TPS_PORT);
-        } else if (model.contains(QUAD)) {
+        } else if (model.contains(DeviceProxy.DEVICE_MODEL_QUAD)) {
             return new QUAD(QUAD_PORT);
         } else {
             throw new RuntimeException("不明设备型号: " + model);

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

+package com.bgycc.smartcanteen.utils;
+
+import com.bgycc.smartcanteen.qrcode.IQRCodeScan;
+import com.bgycc.smartcanteen.qrcode.QRCodeScanFactory;
+
+import java.io.File;
+
+/**
+ * 多设备相关方案的代理类 <br/>
+ * 设计该代理类目的是为了增加设备时，务必在下面所有方法的实际执行里进行适配
+ */
+public class DeviceProxy {
+    public static final String DEVICE_MODEL_TPS = "TPS";
+    public static final String DEVICE_MODEL_QUAD = "QUAD";
+
+    public static IQRCodeScan createQRCodeScan() throws Exception {
+        return QRCodeScanFactory.create();
+    }
+
+    public static boolean updateApp(File updateApk) {
+        return InstallManager.install(updateApk);
+    }
+}

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

+package com.bgycc.smartcanteen.utils;
+
+import android.os.Build;
+
+import com.blankj.utilcode.util.AppUtils;
+import com.blankj.utilcode.util.LogUtils;
+
+import java.io.File;
+
+import static com.bgycc.smartcanteen.utils.SmartCanteenUtils.TAG;
+
+public class InstallManager {
+    public static boolean install(File updateApk) {
+        String model = Build.MODEL;
+        if (model.contains(DeviceProxy.DEVICE_MODEL_TPS)) {
+            // 6.0以下安装包需要修改权限才能安装
+            try {
+                Process p = Runtime.getRuntime().exec("chmod 755 " + updateApk);
+                p.waitFor();
+                DangerousUtils.installAppSilent(updateApk);
+                LogUtils.d(TAG, "开始安装");
+                return true;
+            } catch (Exception e) {
+                LogUtils.e(TAG, "安装文件权限修改失败");
+                return false;
+            }
+        } else if (model.contains(DeviceProxy.DEVICE_MODEL_QUAD)) {
+            AppUtils.installApp(updateApk);
+            return true;
+        } else {
+            throw new RuntimeException("不明设备型号: " + model);
+        }
+    }
+}

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

@@ -9,11 +9,11 @@ import androidx.lifecycle.ViewModel;
 import com.bgycc.smartcanteen.entity.Command;
 import com.bgycc.smartcanteen.entity.PayData;
 import com.bgycc.smartcanteen.qrcode.IQRCodeScan;
-import com.bgycc.smartcanteen.qrcode.QRCodeScanFactory;
 import com.bgycc.smartcanteen.state.QRCodeState;
 import com.bgycc.smartcanteen.executor.SCTaskExecutor;
 import com.bgycc.smartcanteen.repository.CommandRepository;
 import com.bgycc.smartcanteen.repository.PayDataRepository;
+import com.bgycc.smartcanteen.utils.DeviceProxy;
 import com.bgycc.smartcanteen.utils.SmartCanteenUtils;
 import com.blankj.utilcode.util.LogUtils;
 import com.google.gson.JsonObject;
@@ -58,7 +58,7 @@ public class QRCodeViewModel extends ViewModel {
 
     public void initialize() {
         try {
-            scan = QRCodeScanFactory.create();
+            scan = DeviceProxy.createQRCodeScan();
             scan();
         } catch (Exception e) {
             LogUtils.e(TAG, "串口初始化失败: " + e.getMessage(), e);