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我正在使用HTTPConnections &文件系統下載圖像並將該圖像保存在黑莓模擬器SDCard中。當我執行代碼時，它在BB 9500 Simulator（OS Version 5.0）&中工作良好。但是，當我在BB 9900模擬器（操作系統版本7.1）中執行相同的代碼沒有得到輸出（我的意思是不保存在SD卡中的圖像）。下面的是下面的代碼，我使用..從服務器下載黑莓圖片？
代碼：
MyApp.java
public class MyApp extends UiApplication
{
/**
* Entry point for application
* @param args Command line arguments (not used)
*/
public static void main(String[] args)
{
// Create a new instance of the application and make the currently
// running thread the application's event dispatch thread.
MyApp theApp = new MyApp();
theApp.enterEventDispatcher();
}
/**
* Creates a new MyApp object
*/
public MyApp()
{
// Push a screen onto the UI stack for rendering.
pushScreen(new MyScreen());
}
}
MyScreen.java
public final class MyScreen extends MainScreen
{
/**
* Creates a new MyScreen object
*/
public MyScreen()
{
// Set the displayed title of the screen
setTitle("MyTitle");
LabelField title = new LabelField("hiiiiiiiiiiii", LabelField.ELLIPSIS);
add(title);
DownloadHelper downloader = new DownloadHelper("http://www.google.co.in/images/srpr/logo3w.png");
System.out.println("this is downloader");
Thread worker = new Thread(downloader);
worker.start();
}
}
DownloadHelper.java
public class DownloadHelper implements Runnable{
private String _url;
public DownloadHelper(String url) {
_url = url;
}
public void run() {
// TODO Auto-generated method stub
System.out.println("---------------download helper page");
HttpConnection connection = null;
OutputStream output = null;
InputStream input = null;
try {
// Open a HTTP connection to the webserver
connection = (HttpConnection) Connector.open(_url);
// Getting the response code will open the connection, send the request,
// and read the HTTP response headers. The headers are stored until requested.
if (connection.getResponseCode() == HttpConnection.HTTP_OK) {
System.out.println("----------------http connection response");
input = new DataInputStream(connection.openInputStream());
int len = (int) connection.getLength(); // Get the content length
if (len > 0) {
System.out.println("--------------entered into condition");
// Save the download as a local file, named the same as in the URL
String filename = _url.substring(_url.lastIndexOf('/') + 1);
FileConnection outputFile = (FileConnection) Connector.open("file:///SDCard/BlackBerry/pictures/" + filename,
Connector.READ_WRITE);
if (!outputFile.exists()) {
outputFile.create();
}
// This is probably not a robust check ...
if (len <= outputFile.availableSize()) {
output = outputFile.openDataOutputStream();
// We'll read and write this many bytes at a time until complete
int maxRead = 1024;
byte[] buffer = new byte[maxRead];
int bytesRead;
for (;;) {
bytesRead = input.read(buffer);
if (bytesRead <= 0) {
break;
}
output.write(buffer, 0, bytesRead);
}
output.close();
}
}
}
} catch (java.io.IOException ioe) {
ioe.printStackTrace();
} finally {
try {
if (output != null) {
output.close();
}
if (connection != null) {
connection.close();
}
if (input != null) {
input.close();
}
} catch (IOException e) {
// do nothing
}
}
System.out.println("download completed.......");
}
}
以下ing是我用來下載圖像的代碼&將它保存在BB SDCard中。
在BlackBerry模擬器：
BB 9550（5.0 OS）----工作（在SD卡保存圖像）
BB 9800（6.0 OS）----工作（在SD卡保存圖像）
BB 9900（7.1 OS）----無法正常工作（在SD卡不保存圖像）
誰能幫我這個..等待你的答覆提前&感謝....
幹得好。這是一個精心編寫的問題，需要明確的調試問題。我會在明天嘗試在9900模擬器上運行它。 – Nate
@Nate，謝謝。將等待您的回覆... –