Question

我的Android代码存在问题，我正在使用SDK从Dynamodb读取我想使用getItem读取一个Item，但是如果找到Item，我想要做一个Toast msg＆＃34; Item被发现＆＃34;如果没有找到吐司信息＆＃34;没有找到任何项目。在DynamoDBManager类中，文件是可以的，我需要在我的Activity类中获取该信息

public static WinTicket getTicketByBarcode(String barcodeNumber) {

    AmazonDynamoDBClient ddb = Barca.clientManager.ddb();
    DynamoDBMapper mapper = new DynamoDBMapper(ddb);

    try {
        WinTicket winTicket = mapper.load(WinTicket.class,
                barcodeNumber);

        if(winTicket == null){

           String awo = "false" ;
            Log.e(TAG,"NOT FOUND");
            // No item found
        }
        else{

            String awo = "true" ;

            Log.e(TAG,"YES FILE IN DATABASE");

            // Item is found in database
        }







        return winTicket;

    } catch (AmazonServiceException ex) {
        Barca.clientManager.wipeCredentialsOnAuthError(ex);
    }

    return null;
}

上面的代码是DynamodbManager类

这里的人来自Barca Activity课程我认为在Activity文件中我需要做一些编辑我不知道但是我确定它在私有类DynamoDBManagerTask或protected void onPostExecute

private class DynamoDBManagerTask extends
        AsyncTask<DynamoDBManagerType, Void, DynamoDBManagerTaskResult> {

    protected DynamoDBManagerTaskResult doInBackground(
            DynamoDBManagerType... types) {

        DynamoDBManagerTaskResult result = new DynamoDBManagerTaskResult();

        result.setTaskType(types[0]);

        if (types[0] == DynamoDBManagerType.GET_BARCODE) {

            user = DynamoDBManager.getTicketByBarcode(winnum);
            Log.e(TAG,winnum);


        }

        return result;
    }

    protected void onPostExecute(DynamoDBManagerTaskResult result) {
        //  pdia.dismiss();

        if (result.getTaskType() == DynamoDBManagerType.GET_BARCODE) {

            if (datafound.equalsIgnoreCase("true")) {
                Log.e(TAG,datafound);


                Toast.makeText(Barca.this, "Item found",
                        Toast.LENGTH_SHORT).show();

            }

         else if (datafound.equalsIgnoreCase("false")){
                Log.e(TAG,datafound);


                Toast.makeText(
                    Barca.this,
                    "Sorry no Item found",
                    Toast.LENGTH_SHORT).show();

        }
    }
    }
}

Answer 1

我必须在protected void onPostExecute（DynamoDBManagerTaskResult result）部分使用和if语句

if user == null { 
                   //item not in database 
                 }

           else {   
                  // item in database 
                 }

如果在Android中找到或不使用Dynamodb，如何获得getitem

1 个答案: