我正在爲將要下載文件的黑莓應用程序工作。我想在此下載過程中顯示進度條。我已經嘗試了GaugeField和ProgressIndicatorView的每個組合,但我沒有得到任何結果。我的下載正在進行,但進度條永遠不會在屏幕上更新。實際上,在我開始嘗試進度條之前,我試圖簡單地使用TextField並使用當前下載完成的百分比進行更新,而且我也沒有這種方式。下載期間黑莓進度條
這是我的屏幕裏:
view = new ProgressIndicatorView(0);
model = new ProgressIndicatorModel(0, 100, 0);
controller = new ProgressIndicatorController();
model.setController(controller);
view.setModel(model);
view.setController(controller);
controller.setModel(model);
controller.setView(view);
view.setLabel("Percent completion");
view.createProgressBar(Field.FIELD_HCENTER);
add(view);
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
downloadVideo();
initializeMedia();
// If initialization was successful...
if(_videoField != null)
{
createUI();
updateVideoSize();
try {
_player.start();
} catch (MediaException e) {
// TODO Auto-generated catch block
e.printStackTrace();
ScreenSaverActivity.errorDialog("MEDIA EXCEPTION: "+e.toString());
}
}
else
{
_statusField.setText("Error: Could not load media");
}
}
});
downloadVideo()方法:
private void downloadVideo(){
DownloadThread _dlThread = new DownloadThread();
_dlThread.start();
}
DownloadThread類:
class DownloadThread extends Thread {
public void run(){
try {
HttpConnection httpConn;
httpConn = (HttpConnection)Connector.open("http://url/to/myMovie.mp4");
InputStream is = httpConn.openInputStream();
String fName = "file:///store/BlackBerry/videos/myMovie.mp4";
FileConnection fconn = (FileConnection) Connector.open(fName, Connector.READ_WRITE);
if (!fconn.exists())
fconn.create();
OutputStream os = fconn.openOutputStream();
long lengthOfFile = httpConn.getLength();
int total = 0;
int count;
byte data[] = new byte[1024];
while ((count = is.read(data)) != -1) {
//I have tried this line outside of synchronized too, with no luck
synchronized(Application.getEventLock()) {
EmbeddedMediaScreen.this.model.setValue((int)(total*100/lengthOfFile));
}
total += count;
//write this chunk
os.write(data, 0, count);
}
os.flush();
os.close();
} catch (IOException e) {
ScreenSaverActivity.errorDialog(e.toString());
e.printStackTrace();
}
}
}
雖然我的應用程序是做下載該設備無法響應,所以我猜測我的麻煩是下載工作正在主要(UI)上進行d出於某種原因,這與我爲什麼無法通過進度更新屏幕有關。任何幫助將不勝感激。
P.S. Android通常是我的家,而不是黑莓,對不起,如果我忽略了一些應該是顯而易見的東西=/
你讓我朝着正確的方向前進。它正在工作。將稍後發佈適用於我的代碼。萬分感謝! – FoamyGuy