[英]Downloading zip file in android
我有以下代碼片段,可從Internet將zip文件下載到我的SD卡中。 它將下載原始大小的文件。 但是我無法提取文件,因為它顯示“文件損壞”錯誤。 它發生在所有網址上。
URL url;
URLConnection conn;
int fileSize;
InputStream inStream;
String outFile;
String fileName = "";
OutputStream outStream;
Message msg;
msg = Message.obtain(mhandler, DOWNLOAD_STARTED, 0, 0, downloadUrl);
mhandler.sendMessage(msg);
try {
url = new URL(downloadUrl);
conn = url.openConnection();
if(url.getProtocol().equals("https")){
conn = (HttpsURLConnection) conn;
}
conn.addRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
conn.addRequestProperty("Accept-Encoding", "gzip, deflate, sdch");
fileSize = conn.getContentLength();
int fileSizeKB = fileSize / 1024;
msg = Message.obtain(mhandler, DOWNLOAD_STARTED, fileSizeKB, 0,
fileName);
mhandler.sendMessage(msg);
inStream = conn.getInputStream();
outFile = Environment.getDataDirectory().getPath()+"/windows/Documents/file.zip";
outStream = new FileOutputStream(outFile);
byte[] data = new byte[1024];
int bytesRead = 0;
while (!isInterrupted()
&& (bytesRead = inStream.read(data)) != -1) {
outStream.write(data, 0, bytesRead);
}
outStream.flush();
outStream.close();
inStream.close();
if (isInterrupted()) {
new File(outFile).delete();
} else {
msg = Message.obtain(mhandler, DOWNLOAD_COMPLETED);
mhandler.sendMessage(msg);
}
} catch (Exception exp) {
msg = Message.obtain(mhandler, DOWNLOAD_FAILED);
mhandler.sendMessage(msg);
}
你能告訴我我在做什么錯嗎?
嘗試使用以下代碼下載文件:
public class download extends Activity {
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private Button startBtn;
private ProgressDialog mProgressDialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
startBtn = (Button)findViewById(R.id.startBtn);
startBtn.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
startDownload();
}
});
}
private void startDownload() {
String url = "http://farm1.static.flickr.com/114/298125983_0e4bf66782_b.zip";
new DownloadFileAsync().execute(url);
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_DOWNLOAD_PROGRESS:
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("Downloading file..");
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setCancelable(false);
mProgressDialog.show();
return mProgressDialog;
default:
return null;
}
}
class DownloadFileAsync extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(DIALOG_DOWNLOAD_PROGRESS);
}
@Override
protected String doInBackground(String... aurl) {
int count;
try {
URL url = new URL(aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream("/sdcard/some_photo_from_gdansk_poland.zip");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC",progress[0]);
mProgressDialog.setProgress(Integer.parseInt(progress[0]));
}
@Override
protected void onPostExecute(String unused) {
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
}
}
}
int mFileSize = 0;
String path = "/sdcard/path";
final int BUFFER_SIZE = 1024;
BufferedInputStream bis;
RandomAccessFile fos;
byte[] buf = new byte[BUFFER_SIZE];
int curPosition = 0;
File destFile = new File(path + File.separator + "fileName");
if(destFile.exists()) {
destFile.delete();
}
try {
URL url = new URL("http://xxx.xxx");
URLConnection conn = url.openConnection();
conn.setAllowUserInteraction(true);
mFileSize = conn.getContentLength();
if(mFileSize <= 0) {
if(destFile.exists()) {
destFile.delete();
}
return;
}
fos = new RandomAccessFile(destFile, "rw");
bis = new BufferedInputStream(conn.getInputStream());
while(curPosition < mFileSize) {
int len = bis.read(buf, 0, BUFFER_SIZE);
if (len == -1) {
break;
}
fos.write(buf, 0, len);
curPosition += len;
}
bis.close();
fos.close();
} catch (Exception e) {
e.printStackTrace();
if(destFile.exists()) {
destFile.delete();
}
}
看起來您在保存期間破壞了zip文件:
代替:
outStream.write(data, 0, bytesRead);
嘗試:
outStream.write(data);
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