java - 在 BroadcastReceiver 中使用 callbackContext

Question

我有一个使用名为“com.hyipc.core.service.barcode.BarcodeService2D”的服务扫描条形码的 Cordova 插件。这是通过向广播接收器注册接收器来完成的。

扫描过程运行成功，但我想将扫描结果发送回我的 cordova 应用程序，我看到这是使用 callbackContext.success(strBarcode) 完成的。问题是我不能在我的 BarcodeReceiverClass 中使用它。有什么方法可以将数据从 onReceive 内部发送回我的应用程序？

public class Scanner extends CordovaPlugin {

    private BroadcastReceiver mReceiver = new BarcodeReceiver();
    private Intent intentService = new Intent("com.hyipc.core.service.barcode.BarcodeService2D");
    public static final String ACTION_BARCODE_SERVICE_BROADCAST = "action_barcode_broadcast";
    public static final String KEY_BARCODE_STR = "key_barcode_string";
    private String strBarcode = "";

    @Override
    public boolean execute(String action, JSONArray data, CallbackContext callbackContext) throws JSONException {

        if (action.equals("scan")) {
            scan();
            return true;
        } else {
            return false;
    }
}

    public void scan() {
        IntentFilter filter = new IntentFilter();
        filter.addAction(ACTION_BARCODE_SERVICE_BROADCAST);

        cordova.getActivity().startService(intentService);
        cordova.getActivity().registerReceiver(mReceiver, filter);  
    }

    public class BarcodeReceiver extends BroadcastReceiver {
        public void onReceive(Context ctx, Intent intent) {
            if (intent.getAction().equals(ACTION_BARCODE_SERVICE_BROADCAST)) {
                strBarcode = intent.getExtras().getString(KEY_BARCODE_STR);
                callbackContext.success(strBarcode);
            }
        }
    }
}

Answer 1

您需要将回调上下文参数传递给您的 BarcodeReceiver 类:

public class Scanner extends CordovaPlugin {
   ....
    private BroadcastReceiver mReceiver = null;

    @Override
    public boolean execute(String action, JSONArray data, CallbackContext callbackContext) throws JSONException {
       ....
       mReceiver = new BarcodeReceiver(callbackContext);
       ....
    }
   ....
}

public class BarcodeReceiver extends BroadcastReceiver {

    private CallbackContext callbackContext;

    public BarcodeReceiver (CallbackContext callbackContext) {
        this.callbackContext = callbackContext;
    }

    public void onReceive(Context ctx, Intent intent) {
        if (intent.getAction().equals(ACTION_BARCODE_SERVICE_BROADCAST)) {
            strBarcode = intent.getExtras().getString(KEY_BARCODE_STR);
            callbackContext.success(strBarcode);
        }
    }
}