我有一个关于下载管理器的问题.我要从网站下载文件.当我设置下载的默认目录(Environment.DIRECTORY_DOWNLOAD)时,一切正常,我的下载开始了.但是,如果我尝试更改目录,我的应用程序不会下载该文件.特别是,我希望我的文件进入下载文件夹,例如/ storage/sdcard/Download/myFolder.我该如何解决这个问题？
File mydownload = new File (Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)+ "/myFolder");
if (!mydownload.exists()){
mydownload.mkdir();
}
String url = sUrl[0];
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
}
request.setDestinationInExternalPublicDir(mydownload.getAbsolutePath(),"Myfile.extension");
DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);
我正在使用1个XML中的Imageview和Button,我正在从webServer中将图像作为URL重新显示并在ImageView上显示它.现在,如果单击按钮(保存),我需要将该特定图像保存到SD卡中.这该怎么做？
注意:当前图像应保存.
我正在将图像从url保存到SD卡.但是sdcard中的图像大小为0.图像在SD卡中创建,但现在从URL检索数据并保存.所以它给我0大小.
try
{
URL url = new URL("http://api.androidhive.info/images/sample.jpg");
InputStream input = url.openStream();
try {
//The sdcard directory e.g. '/sdcard' can be used directly, or
//more safely abstracted with getExternalStorageDirectory()
File storagePath = Environment.getExternalStorageDirectory();
OutputStream output = new FileOutputStream (new File(storagePath,username+".png"));
try {
byte[] buffer = new byte[2048];
int bytesRead = 0;
while ((bytesRead = input.read(buffer, 0, buffer.length)) >= 0) {
output.write(buffer, 0, bytesRead);
}
} finally {
output.close();
}
} finally {
input.close();
}
} catch(Exception e)
{
System.out.println("error in …我需要从url下载图像并将其保存在应用程序的drawable-hdpi文件夹中,然后在ImageView中显示它.我怎么能这样做？