我对此进行了很多搜索,但没有找到答案。
我想下载一个文件(给出 url、目的地和文件名)。我有一个扩展 AsyncTast 类的类。它适用于 Wi-Fi 连接,但不适用于移动数据(G、3g、H)!我不知道为什么,我要疯了。
任何人都可以遇到我相同或类似的问题吗?谢谢!
我在下面发布我的代码。谢谢
public class AsyncDownloader extends AsyncTask<String, Integer, String> {
@Override
protected String doInBackground(String... sUrl) {
try {
Log.v("Downloader", "Source: " + sUrl[0]);
Log.v("Downloader", "Destin: " +sUrl[1]+"/" + sUrl[2]);
URL url = new URL(sUrl[0]);
URLConnection connection = url.openConnection();
connection.connect();
// this will be useful so that you can show a typical 0-100% progress bar
int fileLength = connection.getContentLength();
// download the file
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(sUrl[1]+"/" + sUrl[2]);
byte data[] = new byte[1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// publishProgress((int) (total * 100 / fileLength));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {
}
return null;
}
}
从主要活动..
AsyncDownloader downloader = new AsyncDownloader();
downloader.execute("http://....", "...destination...", "...filename...");
在目标目录中有时我找到了该文件,但它没有完全下载或者它是 0 kB ..
在 AndroidManifest.xml 我有:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.CALL_PHONE" />
我使用此功能检查连接(它似乎运作良好):
public boolean isOnline() {
ConnectivityManager cm =
(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo() != null &&
cm.getActiveNetworkInfo().isConnectedOrConnecting();
}
LogCat(很长 - 完整):http : //pastebin.com/EL4DREwB LogCat(简短,必不可少 - 开始-完成应用程序运行时): http: //pastebin.com/wPYDQH3P