笨海豚部落格

最近需要用到個功能

就是在Android裝置上，透過網路下載檔案

在網路上找了一下方法，以測試過可行

如下:

        DownloadFile_Btn = (Button) findViewById(R.id.button1);
        
    DownloadFile_Btn.setOnClickListener(new Button.OnClickListener(){

public void onClick(View arg0) {
// TODO Auto-generated method stub

try {
//set the download URL, a url that points to a file on the internet
//this is the file to be downloaded
URL url = new URL("http://xxx.xxx.xxx/testfile.doc");


//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 = Environment.getExternalStorageDirectory();
//create a new file, specifying the path, and the filename
//which we want to save the file as.
File file = new File("/data/data/com.xxx.xxx/","testfile.doc");

//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;
//this is where you would do something to report the prgress, like this maybe
updateProgress(downloadedSize, totalSize);

}
//close the output stream when done
fileOutput.close();

//catch some possible errors...
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// see http://androidsnippets.com/download-an-http-file-to-sdcard-with-progress-notification

}