didRangeBeaconsInRegion和REST webservice

时间:2015-03-30 00:11:22

标签: java altbeacon

我尝试在此方法中调用rest服务并返回以下错误:

public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
  for (Beacon beacon: beacons) {
    logToDisplay( "ok, detectou beacons" );

    RequestParams params = new RequestParams();
    params.put("beaconId", "gass76382hshsfk");
    AsyncHttpClient client = new AsyncHttpClient();
    client.get("http://192.168.1.130:8080/BeaconServer/palestra/listarPalestras", params, new AsyncHttpResponseHandler() {
      // When the response returned by REST has Http response code '200'
      @Override
      public void onSuccess(int arg0, Header[] arg1, byte[] response) {
        try {
          String respString = new String(response, "UTF-8");
          JSONObject obj = new JSONObject(respString);
          JSONArray jsonArray = obj.getJSONArray("palestra");

          for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            String nomePalestrante = jsonObject.getString("nomePalestrante");
            String assuntoPalestra = jsonObject.getString("assuntoPalestra");
            String beaconId = jsonObject.getString("beaconId");

            logToDisplay(nomePalestrante + "\r\n" + assuntoPalestra + "\r\n" + beaconId + "\r\n");

            //string+"\r\n";  
          }
        } catch (JSONException e) {
          // TODO Auto-generated catch block
          logToDisplay("JSONException e");
          Toast.makeText(getApplicationContext(),
            "Error Occured [Server's JSON response might be invalid]!",
            Toast.LENGTH_LONG).show();
          e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
          // erro ao converter o array de bytes json para String
          e.printStackTrace();
        }
      }

      // When the response returned by REST has Http response code other than '200'
      @Override
      public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {
        // Hide Progress Dialog
        // When Http response code is '404'
        if (statusCode == 404) {
          logToDisplay("404 " + errorResponse.toString());
          Toast.makeText(getApplicationContext(),
            "Requested resource not found",
            Toast.LENGTH_LONG).show();
        }
        // When Http response code is '500'
        else if (statusCode == 500) {
          logToDisplay("500 " + errorResponse.toString());
          Toast.makeText(getApplicationContext(),
              "Something went wrong at server end",
              Toast.LENGTH_LONG).show();
        }
        // When Http response code other than 404, 500
        else {
          logToDisplay("outros " + errorResponse.toString());
          Toast.makeText(getApplicationContext(),
              "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]",
              Toast.LENGTH_LONG).show();
        }
      }
    });
  }
}

显示以下错误,不知道还能做什么

  

03-29 21:04:16.034:D / BluetoothAdapter(10437):stopLeScan()
  03-29 21:04:16.043:D / BluetoothAdapter(10437):startLeScan():null
  03-29 21:04:16.051:D / BluetoothAdapter(10437):onClientRegistered() - status = 0 clientIf = 5
  03-29 21:04:16.322:W / dalvikvm(10437):threadid = 15:线程退出未捕获异常(组= 0x416f9d40)
  03-29 21:04:17.185:D / BluetoothAdapter(10437):stopLeScan()
  03-29 21:04:17.195:D / BluetoothAdapter(10437):startLeScan():null
  03-29 21:04:17.202:D / BluetoothAdapter(10437):onClientRegistered() - status = 0 clientIf = 5
  03-29 21:04:18.332:D / BluetoothAdapter(10437):stopLeScan()
  03-29 21:04:18.340:D / BluetoothAdapter(10437):startLeScan():null
  03-29 21:04:18.347:D / BluetoothAdapter(10437):onClientRegistered() - status = 0 clientIf = 5
  03-29 21:04:19.467:D / BluetoothAdapter(10437):stopLeScan()
  03-29 21:04:19.476:D / BluetoothAdapter(10437):startLeScan():null
  03-29 21:04:19.485:D / BluetoothAdapter(10437):onClientRegistered() - status = 0 clientIf = 5
  03-29 21:04:20.618:D / BluetoothAdapter(10437):stopLeScan()
  03-29 21:04:20.627:D / BluetoothAdapter(10437):startLeScan():null
  03-29 21:04:20.633:D / BluetoothAdapter(10437):onClientRegistered() - status = 0 clientIf = 5
  03-29 21:04:21.476:E / AndroidRuntime(10437):致命异常:IntentService [BeaconIntentProcessor]
  03-29 21:04:21.476:E / AndroidRuntime(10437):处理:org.altbeacon.beaconreference,PID:10437
  03-29 21:04:21.476:E / AndroidRuntime(10437):java.lang.NullPointerException
  03-29 21:04:21.476:E / AndroidRuntime(10437):at org.altbeacon.beaconreference.MonitoringActivity $ 4.onFailure(MonitoringActivity.java:199)
  03-29 21:04:21.476:E / AndroidRuntime(10437):at com.loopj.android.http.AsyncHttpResponseHandler.handleMessage(AsyncHttpResponseHandler.java:319)
  03-29 21:04:21.476:E / AndroidRuntime(10437):at com.loopj.android.http.AsyncHttpResponseHandler $ ResponderHandler.handleMessage(AsyncHttpResponseHandler.java:138)
  03-29 21:04:21.476:E / AndroidRuntime(10437):在android.os.Handler.dispatchMessage(Handler.java:102)
  03-29 21:04:21.476:E / AndroidRuntime(10437):在android.os.Looper.loop(Looper.java:136)
  03-29 21:04:21.476:E / AndroidRuntime(10437):在android.os.HandlerThread.run(HandlerThread.java:61)
  03-29 21:04:21.784:D / BluetoothAdapter(10437):stopLeScan()

1 个答案:

答案 0 :(得分:0)

由于我不知道哪一行代码在第199行,我只能猜到是什么给你一个NPE。我检查了你的代码。很可能你从REST得到一个null错误响应,它给你一个NPE。由于onFailure方法没有任何内容,errorResponse.toString(),这应该是问题所在。

您可以创建如下所示的变量,并在任何您喜欢的地方使用它,您应该将"not known"更改为对您更有意义的其他内容。

String errorText = errorResponse != null ? errorResponse.toString() : "not known";