在我的申請中，我需要獲得不同貨幣的當前匯率。正如this,this和this提出的一個很好的方法是使用Yahoo Finance服務。Android中的雅虎貨幣匯率4
所以，當我想找到，例如，美元和加元的速度，我只需發送此鏈接：http://download.finance.yahoo.com/d/quotes.csv?s=USDCAD=X&f=sl1d1t1ba&e=.csv
這是工作的罰款我都摩托羅拉Atrix手機採用Android 2.3.4模擬器再次使用Google API 2.3.3。但是，當我嘗試使用Android ICS 4.0的Galaxy SII和Google API 4.0的模擬器完全相同的鏈接時，在這兩種情況下，quotes.csv文件僅包含「缺少符號列表」。
經過挖掘，我發現，如果沒有找到費率，這種響應可能會發生。但是這個迴應是我在Android 4.0下嘗試的任何貨幣（Galaxy SII或模擬器）。因此，我無法使用Android 4.0獲得費率，但我可以使用Android 2.x.
有沒有人遇到同樣的問題？有什麼解決方法嗎？
編輯：這是線程代碼與下載速率從雅虎貨幣服務涉及：
//show the progress dialog
downloadingDialog.show();
Runnable getRates = new Runnable() {
public void run(){
dataNotFound = false;
final String baseDir = getApplicationContext().getFilesDir().getAbsolutePath();
//download the rates from yahoo to a CSV file
downloadFileViaHTTP (baseDir);
//read the file line
String filePath = baseDir + "/" + "quotes.csv";
Log.d(tag, "-> filePath = " + filePath);
try {
// open the file for reading
InputStream instream = new FileInputStream(filePath);
// if file the available for reading
if (instream != null) {
// prepare the file for reading
InputStreamReader inputreader = new InputStreamReader(instream);
BufferedReader buffreader = new BufferedReader(inputreader);
//read the line
String fileLine = buffreader.readLine();
Log.d(tag, "fileLine = " + fileLine);
instream.close();
}
}
catch (Exception ex) {
// print stack trace.
}
}
};
final Thread t = new Thread(getRates);
t.start();
，這是我從雅虎網站下載quotes.csv文件功能：
public void downloadFileViaHTTP (String localPath) {
Log.d(tag, "downloadFileViaHTTP...");
try {
//this is the Yahoo url
String urlFile = "http://download.finance.yahoo.com/d/quotes.csv?s=" + fromCurrency + toCurrency + "=X&f=sl1d1t1ba&e=.csv";
Log.d(tag,"urlFile = " + urlFile);
URL url = new URL(urlFile);
//create the new connection
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.connect();
//pointer to the downloaded file path
String localFileName = localPath + "/" + "quotes.csv";
//this is the actual downloaded file
File MyFilePtrDest = new File(localFileName);
Log.d(tag,"localFileName = " + localFileName);
//this will be used in reading the data from the Internet
InputStream inputStream = urlConnection.getInputStream();
//this will be used to write the downloaded data into the file we created
FileOutputStream fileOutput = new FileOutputStream(MyFilePtrDest);
byte[] buffer = new byte[1024];
int bufferLength = 0; //used to store a temporary size of the buffer
//write buffer contents to file
while ((bufferLength = inputStream.read(buffer)) > 0) {
//add the data in the buffer to the file in the file output stream (the file on the sd card
fileOutput.write(buffer, 0, bufferLength);
}
inputStream.close();
//close the output stream when done
fileOutput.flush();
fileOutput.close();
urlConnection.disconnect();
}
catch (IOException e) {
//data were not found
dataNotFound = true;
// TODO Auto-generated catch block
e.printStackTrace();
}
}
這是從谷歌API 2.3.3模擬器日誌：
12-18 11:04:24.091: D/CurrencyConverter(414): downloadFileViaHTTP...
12-18 11:04:24.091: D/CurrencyConverter(414): urlFile = http://download.finance.yahoo.com/d/quotes.csv?s=EURUSD=X&f=sl1d1t1ba&e=.csv
12-18 11:04:24.282: D/CurrencyConverter(414): localFileName = /data/data/com.myapps.currencyconverter/files/quotes.csv
12-18 11:04:24.461: D/CurrencyConverter(414): -> filePath = /data/data/com.myapps.currencyconverter/files/quotes.csv
12-18 11:04:24.461: D/CurrencyConverter(414): fileLine = "EURUSD=X",1.3172,"12/18/2012","4:03am",1.317,1.3174
這是日誌從谷歌API 4.0模擬器：
12-18 11:47:36.130: D/CurrencyConverter(668): downloadFileViaHTTP...
12-18 11:47:36.130: D/CurrencyConverter(668): urlFile = http://download.finance.yahoo.com/d/quotes.csv?s=EURUSD=X&f=sl1d1t1ba&e=.csv
12-18 11:47:36.449: D/dalvikvm(668): GC_CONCURRENT freed 306K, 4% free 11714K/12167K, paused 5ms+10ms
12-18 11:47:36.951: D/CurrencyConverter(668): localFileName = /data/data/com.myapps.currencyconverter/files/quotes.csv
12-18 11:47:37.159: D/CurrencyConverter(668): -> filePath = /data/data/com.myapps.currencyconverter/files/quotes.csv
12-18 11:47:37.159: D/CurrencyConverter(668): fileLine = Missing Symbols List.
正如你可以看到「fileLine」字符串變量，在它得到正確率第一種情況，而在二，quotes.csv文件只包含「缺少符號列表」。值。
編輯2：我已經上傳到shared folder完整的Android項目，所以每個人都可以嘗試。您可以編譯和運行Android 2.x和4模擬器（或手機，如果您有:-)）
編輯3：雖然這不是一個直接的答案，但它仍是一種解決方法。我使用谷歌貨幣計算器而不是雅虎。要使用谷歌貨幣計算器，只需使用以下代碼更改雅虎網址：http://www.google.com/ig/calculator?hl=en&q=1「+ fromCurrency +」=？「+ toCurrency。點擊this link查看將78歐元轉換爲美元的示例。 。但是如果有人發現爲什麼這是發生在雅虎網站，這將是很好的分享它與我們..
發佈您的代碼。 –
我已編輯我的答案（EDIT3）採用了使用Google貨幣計算器的解決方法。 – Dimitris