0
即时制作一个android应用程序从android下载pdf文件,然后将它们保存在内部或外部memory.but有时由于互联网连接下载下载停止没有finshing.like文件大小为1.1MB,它的唯一下载高达750kb。现在的问题是,文件是否完全下载或不是我的应用程序将其显示为下载,但实际上它不是。因此,我想知道文件befor的确切大小和下载后,以便我可以找到文件是否完全下载。并想重新开始下载。 任何人可以帮助我........ 我的代码如何知道下载文件的大小在下载之前和之后android
String DownloadUrl = "http://www.example.com/books/"+book_name;
String fileName = book_name;
URL url = new URL(DownloadUrl);
//create the new connection
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
//set up some things on the connection
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
//and connect!
urlConnection.connect();
//set the path where we want to save the file
//in this case, going to save it on the root directory of the
//sd card.
// File SDCardRoot = new File("/storage/emulated/0/documents/docx/stuff/");
File SDCardRoot = new File(Environment.getExternalStorageDirectory()+File.separator+"MybookStore/paper/paperStuff/documents/docx/other/stuff/");
//create a new file, specifying the path, and the filename
//which we want to save the file as.
File file = new File(SDCardRoot,fileName);
String file_size = Long.toString(file.length()/1024);
int size_file=Integer.parseInt(file_size);
//this will be used to write the downloaded data into the file we created
FileOutputStream fileOutput = new FileOutputStream(file);
//this will be used in reading the data from the internet
InputStream inputStream = urlConnection.getInputStream();
//this is the total size of the file
int totalSize = urlConnection.getContentLength();
//variable to store total downloaded bytes
int downloadedSize = 0;
//create a buffer...
byte[] buffer = new byte[1024];
int bufferLength = 0; //used to store a temporary size of the buffer
//now, read through the input buffer and write the contents to the 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);
//add up the size so we know how much is downloaded
downloadedSize += bufferLength;
int progress=(int)(downloadedSize*100/totalSize);
//this is where you would do something to report the prgress, like this maybe
//updateProgress(downloadedSize, totalSize);
}
我的代码
是否使用'android.app.DownloadManager'? – betorcs
分享代码如何下载和跟踪下载的文件? – NightFury
我编辑code.plz现在看@ NightFury –