Worklight 6.0条码或QR码扫描仪问题

Question

我在做POC为QR-code或barcode scanner使用worklight 6.0和使用cordova插件。我试图扫描QR码，它工作正常。当我简单地启动扫描仪时，我遇到了问题，但我还没有进行任何扫描。只要我按下了我们的应用程序关闭的Android按钮，我需要从混合部分回来的应用程序。

任何人都可以建议我。当我取消扫描仪的应用程序关闭时，我需要回到混合动力部分。

我的Android插件：

import org.apache.cordova.api.CallbackContext; 
import org.apache.cordova.api.CordovaPlugin; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 
import android.app.Activity; 
import android.content.Intent; 
import android.util.Log; 


public class BarcodeScanner extends CordovaPlugin { 
    public static final int REQUEST_CODE = 0x0ba7c0de; 

    private static final String SCAN = "scan"; 
    private static final String ENCODE = "encode"; 
    private static final String CANCELLED = "cancelled"; 
    private static final String FORMAT = "format"; 
    private static final String TEXT = "text"; 
    private static final String DATA = "data"; 
    private static final String TYPE = "type"; 
    private static final String SCAN_INTENT = "com.phonegap.plugins.barcodescanner.SCAN"; 
    private static final String ENCODE_DATA = "ENCODE_DATA"; 
    private static final String ENCODE_TYPE = "ENCODE_TYPE"; 
    private static final String ENCODE_INTENT = "com.phonegap.plugins.barcodescanner.ENCODE"; 
    private static final String TEXT_TYPE = "TEXT_TYPE"; 
    private static final String EMAIL_TYPE = "EMAIL_TYPE"; 
    private static final String PHONE_TYPE = "PHONE_TYPE"; 
    private static final String SMS_TYPE = "SMS_TYPE"; 

    private static final String LOG_TAG = "BarcodeScanner"; 

    private CallbackContext callbackContext; 

    /** 
    * Constructor. 
    */ 
    public BarcodeScanner() { 
    } 
    @Override 
    public boolean execute(String action, JSONArray args, CallbackContext callbackContext) { 
     this.callbackContext = callbackContext; 
     Log.d(LOG_TAG, "*************************** EXECUTE ************************************"); 
     if (action.equals(ENCODE)) { 
      JSONObject obj = args.optJSONObject(0); 
      if (obj != null) { 
       String type = obj.optString(TYPE); 
       String data = obj.optString(DATA); 

       // If the type is null then force the type to text 
       if (type == null) { 
        type = TEXT_TYPE; 
       } 

       if (data == null) { 
        callbackContext.error("User did not specify data to encode"); 
        return true; 
       } 

       encode(type, data); 
      } else { 
       callbackContext.error("User did not specify data to encode"); 
       return true; 
      } 
     } else if (action.equals(SCAN)) { 
      Log.d(LOG_TAG, "*************************** SCAN START ************************************"); 
      scan(); 
     } else { 
      Log.d(LOG_TAG, "*************************** SCAN FALSE ************************************"); 
      return false; 
     } 
     return true; 
    } 

    /** 
    * Starts an intent to scan and decode a barcode. 
    */ 
    public void scan() { 
     Intent intentScan = new Intent(SCAN_INTENT); 
     intentScan.addCategory(Intent.CATEGORY_DEFAULT); 

     this.cordova.startActivityForResult((CordovaPlugin) this, intentScan, REQUEST_CODE); 
    } 
    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent intent) { 
     if (requestCode == REQUEST_CODE) { 
      if (resultCode == Activity.RESULT_OK) { 
       Log.d(LOG_TAG, "*************************** RESULT OK ************************************"); 
       JSONObject obj = new JSONObject(); 
       try { 
        obj.put(TEXT, intent.getStringExtra("SCAN_RESULT")); 
        obj.put(FORMAT, intent.getStringExtra("SCAN_RESULT_FORMAT")); 
        obj.put(CANCELLED, false); 
       } catch (JSONException e) { 
        Log.d(LOG_TAG, "This should never happen"); 
       } 
       //this.success(new PluginResult(PluginResult.Status.OK, obj), this.callback); 
       this.callbackContext.success(obj); 
      } else if (resultCode == Activity.RESULT_CANCELED) { 
       Log.d(LOG_TAG, "*************************** RESULT CANCELED ************************************"); 
       JSONObject obj = new JSONObject(); 
       try { 
        obj.put(TEXT, "cancel"); 
        obj.put(FORMAT, "cancel"); 
        obj.put(CANCELLED, true); 
       } catch (JSONException e) { 
        Log.d(LOG_TAG, "This should never happen"); 
       } 
       //this.success(new PluginResult(PluginResult.Status.OK, obj), this.callback); 
       this.callbackContext.success(obj); 
       //this.cordova.getActivity().finish(); 
      } else { 
       //this.error(new PluginResult(PluginResult.Status.ERROR), this.callback); 
       this.callbackContext.error("Unexpected error"); 
      } 
     } 
    } 

    /** 
    * Initiates a barcode encode. 
    * 
    * @param type Endoiding type. 
    * @param data The data to encode in the bar code. 
    */ 
    public void encode(String type, String data) { 
     Intent intentEncode = new Intent(ENCODE_INTENT); 
     intentEncode.putExtra(ENCODE_TYPE, type); 
     intentEncode.putExtra(ENCODE_DATA, data); 
     this.cordova.getActivity().startActivity(intentEncode); 
    } 
} 

回调的JavaScript：

function onScan(){ 
     cordova.exec(onScanSuccess, onScanFailure, 'BarcodeScanner', 'scan', []); 

    } 

    function onScanSuccess(result) { 
     console.log("onScanSuccess @@@@@@@@@@@@@@@@@@@@ text ==" + result.text); 
     console.log("onScanSuccess @@@@@@@@@@@@@@@@@@@@ format == " + result.format); 
     } 

     function onScanFailure(error) { 
      console.log("onScanFailure @@@@@@@@@@@@@@@@@@@@ " + result); 
     } 

Answer 1

你需要重写后退按钮，这样做与您的RESULT_CANCLE。你可以看到一个如何覆盖按钮的例子，在这里：Override back button to act like home button以及许多其他的“覆盖安卓后退按钮”的Seraches。

事情是这样的代码片段：

// 2.0 and above 
@Override 
public void onBackPressed() { 
    // code here 
} 

// Before 2.0 
@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if (keyCode == KeyEvent.KEYCODE_BACK) { 
     // code here 
    } 
    return super.onKeyDown(keyCode, event); 
}