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| public final class DownloadHelper extends AsyncTask
{
protected void onPreExecute(Context context)
{
downloadDatabase(context);
}
protected Object doInBackground(Object... arg0)
{
copyServerDatabase(null);
return null;
}
private static boolean downloadDatabase(Context context)
{
try {
URL url = new URL("urldusite" + "basesqlite.db");
/* Open a connection to that URL. */
URLConnection ucon = url.openConnection();
/*
* Define InputStreams to read from the URLConnection.
*/
InputStream is = ucon.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
/*
* Read bytes to the Buffer until there is nothing more to read(-1).
*/
ByteArrayBuffer baf = new ByteArrayBuffer(50);
int current = 0;
while ((current = bis.read()) != -1) {
baf.append((byte) current);
}
/* Convert the Bytes read to a String. */
FileOutputStream fos = null;
// Select storage location
fos = context.openFileOutput("basesqlite.db", Context.MODE_PRIVATE);
fos.write(baf.toByteArray());
fos.close();
Log.d("BTC", "downloaded");
}
catch (IOException e)
{
Log.e("BTC", "downloadDatabase Error: " , e);
return false;
}
catch (NullPointerException e)
{
Log.e("BTC", "downloadDatabase Error: " , e);
return false;
}
catch (Exception e)
{
Log.e("BTC", "downloadDatabase Error: " , e);
return false;
}
return true;
}
@SuppressLint("SdCardPath")
private void copyServerDatabase(Context context)
{
BtcDb db = new BtcDb(context,"clean.db",null,0);
// by calling this line an empty database will be created into the default system path
// of this app - we will then overwrite this with the database from the server
db.getReadableDatabase();
db.close();
OutputStream os = null;
InputStream is = null;
try {
// Log.d("BTC", "Copying DB from server version into app");
is = context.openFileInput("basesqlite.db");
os = new FileOutputStream("/data/data/com.example.btc_pe/databases/");
copyFile(os, is);
}
catch (Exception e)
{
Log.e("BTC", "Server Database was not found - did it download correctly?", e);
}
finally
{
try
{
//Close the streams
if(os != null)
{
os.close();
}
if(is != null)
{
is.close();
}
}
catch (IOException e)
{
Log.e("BTC", "failed to close databases");
}
}
Log.d("BTC", "Done Copying DB from server");
}
private static void copyFile(OutputStream os, InputStream is) throws IOException
{
byte[] buffer = new byte[1024];
int length;
while((length = is.read(buffer))>0)
{
os.write(buffer, 0, length);
}
os.flush();
}
} |
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