idata_plugin

A Flutter plugin for iData 95W(A03_A3Q_V0.29) Devices

Getting Started

主要技术点在于宿主(Android或iOS)主动发消息到Flutter部分， 官方教程给出了quick_actions这个例子， 需要通过plugin来实现。

1. plugin flutter 定义MethodChannel，定义接收执行结果的方法
2. plugin android 注册该MethodChannel
3. example android 引入arr包，使用android特定代码onKeyDown等，使用invokeMethod执行MethodChannel对应方法。
4. example flutter 接收执行结果并展示。

Plugin

idata_plugin/lib/idata_plugin.dart

1. 定义MethodChannel

   static const MethodChannel _channel = const MethodChannel('idata_barcode_plugin');
   

2. 设置接收方法，用于接收Android端执行invokeMethod后返回的结果

   typedef void IdataHandler(String type); //用于在主程序中调用initializeBarcodeScan时传入回调函数
   

   void initializeBarcodeScan(IdataHandler handler) {
       _channel.setMethodCallHandler((MethodCall call) async {
         assert(call.method == 'zyj.com/idata_barcode_scan'); //断言，如果call.method不为'zyj.com/idata_barcode_scan'则不往下执行
   
         handler(call.arguments); //将接收到的参数传入回调
       });
     }
   

idata_plugin/android

1. 注册MethodChannel

       public static MethodChannel channelBarcodeScan;
       
       private IdataPlugin(Registrar registrar) {
          this.registrar = registrar;
       }
    
       public static void registerWith(Registrar registrar) {
           if (channelBarcodeScan != null) {
            throw new IllegalStateException("You should not call registerWith more than once.");
           }
           channelBarcodeScan = new MethodChannel(registrar.messenger(), "idata_barcode_plugin");
           channelBarcodeScan.setMethodCallHandler(new IdataPlugin(registrar));
       }
   

Example

example/android

1. 引入idatalibrary-release.arr包

   路径为example/android/app/libs/idatalibrary-release.arr 在example/android/app/build.gradle中的dependencies添加

       dependencies {
           ...
           implementation fileTree(include: '*.aar', dir: 'libs')
       }
   

2. 在onKeyDown等事件中调用对应的invokeMethod方法

      public class MainActivity extends FlutterActivity {
          iDataRFID idataRfid = null;
          iDataBarcodeScan idataBarcodeScan = null;
      
          @Override
          protected void onCreate(Bundle savedInstanceState) {
              ...
      
              idataRfid = new iDataRFID(MainActivity.this);
              idataRfid.openRfid();
      
              idataBarcodeScan = new iDataBarcodeScan(MainActivity.this, new ScanCallbackInterface() {
                  @Override
                  public void success(String scanResult) {
                      IdataPlugin.channelBarcodeScan.invokeMethod("zyj.com/idata_barcode_scan", scanResult);
                  }
      
                  @Override
                  public void fail() {
      
                  }
              });
          }
      
          @Override
          public boolean onKeyDown(int keyCode, KeyEvent event) {
              if (keyCode == 139) {
                  idataBarcodeScan.singleScan();
              }
              if (keyCode == 140 || keyCode == 141) {
                  IdataPlugin.channelRfid.invokeMethod("zyj.com/idata_rfid", idataRfid.readUid());
              }
              return super.onKeyDown(keyCode, event);
          }
      
          @Override
          public boolean onKeyUp(int keyCode, KeyEvent event) {
              if (keyCode == 139 || keyCode == 140 || keyCode == 141) {
                  idataBarcodeScan.scanStop();
              }
              return super.onKeyUp(keyCode, event);
          }
      
          @Override
          protected void onDestroy() {
              super.onDestroy();
              idataBarcodeScan.finishScanner();
          }
      }
   
   

example/lib/main.dart

1. 在initState方法中调用idata_plugin的initializeBarcodeScan方法

       String _barcodeScanResult = 'Unknown';   
   
       @override
       void initState() {
           super.initState();
           
           IdataPlugin idataPlugin = new IdataPlugin();
           idataPlugin.initializeBarcodeScan((String result) {
             setState(() {
               _barcodeScanResult = result;
             });
           });
       }
   

项目地址github.com/zzzzzyj/flu…