[android-developers] Download large file from network to SD card
I'm trying to download a large .zip file from a web server but I have
a weird behaviour, the description is:
- I'm executing the code in the device emulator, API level 3 (version
1.5) with an SD card of 512MB. I start the device with Wipe data
user
- The length of the size from conexion.getContentLength() is 7012725
- The server address is localhost (10.0.2.2), but I've tried with an
external server and the behaviour is the same. I've double checked
that I can download the file through a web browser.
- I have these permisions in the manifest file:
uses-permission android:name=android.permission.INTERNET/uses-
permission
uses-permission
android:name=android.permission.WRITE_EXTERNAL_STORAGE/uses-
permission
The error:
- It starts downloading the file, I can see the text 10, 20, 30, 40,
50 and then it stops at 60.
- After a while, the emulator reboots itself.
Workarounds:
- About the possible wifi lock, what I've done is add this
permission android.permission.WAKE_LOCK and then this piece of code,
but with exactly the same behaviour:
WifiManager.WifiLock wifilock;
WifiManager manager = (WifiManager)
getSystemService(Context.WIFI_SERVICE);
wifilock = manager.createWifiLock(wifilock);
wifilock.acquire();
...
wifilock.release();
Here is the code, that it's being executing in a separate thread:
private void downloadData(){
try{
Log.v(TAG, downloading data);
URL url = new URL(http://10.0.2.2/1.zip;);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
Log.v(TAG, lenghtOfFile = +lenghtOfFile);
InputStream is = url.openStream();
File testDirectory = new
File(Environment.getExternalStorageDirectory()+/testDirectory/);
if(!testDirectory.exists()){
testDirectory.mkdir();
}
FileOutputStream fos = new
FileOutputStream(testDirectory+/
files.zip);
byte data[] = new byte[1024];
int count = 0;
long total = 0;
int progress = 0;
while ((count=is.read(data)) != -1)
{
total += count;
int progress_temp = (int)total*100/lenghtOfFile;
if(progress_temp%10 == 0 progress !=
progress_temp){
progress = progress_temp;
Log.v(TAG, total = +progress);
}
fos.write(data, 0, count);
}
is.close();
fos.close();
Log.v(TAG, downloading finished);
}catch(Exception e){
Log.v(TAG, exception in downloadData);
e.printStackTrace();
}
}
** more log description:**
00:00 It starts downloading:
V/iPhoto ( 853): downloading data
V/iPhoto ( 853): lenghtOfFile = 7732809
V/iPhoto ( 853): total = 10
V/iPhoto ( 853): total = 20
V/iPhoto ( 853): total = 30
V/iPhoto ( 853): total = 40
V/iPhoto ( 853): total = 50 (round 00:05)
- Here it stops and the DDMS disconnects the device immediatly
03:40 It finish the download (not always) and the device reboots
on its own:
I/Process ( 595): Sending signal. PID: 595 SIG: 3
I/dalvikvm( 595): threadid=7: reacting to signal 3
D/dalvikvm( 722): GC freed 2193 objects / 135808 bytes in 176 sec
V/iPhoto ( 853): total = 60
I/dalvikvm( 595): Wrote stack trace to '/data/anr/traces.txt'
I/ActivityManager( 595): Process
com.google.android.apps.maps:FriendService (pid 778) has died.
I/ActivityManager( 595): Process com.android.mms (pid 732) has
died.
V/iPhoto ( 853): total = 70
V/iPhoto ( 853): total = 80
V/iPhoto ( 853): total = 90
V/iPhoto ( 853): total = 100
V/iPhoto ( 853): downloading finished
V/iPhoto ( 853): thread finish loading
I/Process ( 595): Sending signal. PID: 595 SIG: 9
I/ActivityThread( 757): Removing dead content provider: settings
I/ActivityThread( 748): Removing dead content provider: settings
I/ActivityThread( 722): Removing dead content provider: settings
I/ActivityThread( 700): Removing dead content provider: settings
I/ServiceManager( 549): service 'package' died
... services dieing...
I/ServiceManager( 549): service 'wifi' died
E/installd( 557): eof
E/installd( 557): failed to read size
I/installd( 557): closing connection
D/qemud ( 560): fdhandler_event: disconnect on fd 11
Re: [android-developers] Download large file from network to SD card
Hi,
Are you doing this from the UI thread? I think you do.
If so, you need to move your networking code to a worker thread. Two
easy ways to do this are: AsyncTask and IntentService (and Mark Murphy's
enhanced version of the latter, WakefulIntentService).
Second, if you're not targeting specifically WiFi, you need a WakeLock,
not a WifiLock.
WakeLock keeps the device awake, while WifiLock keeps WiFi enabled. The
former usually implies the latter.
Your permission (android.permission.WAKE_LOCK) is for WakeLock, as well.
-- Kostya
02.11.2010 17:16, Ferran Garriga Ollé пишет:
I'm trying to download a large .zip file from a web server but I have
a weird behaviour, the description is:
- I'm executing the code in the device emulator, API level 3 (version
1.5) with an SD card of 512MB. I start the device with Wipe data
user
- The length of the size from conexion.getContentLength() is 7012725
- The server address is localhost (10.0.2.2), but I've tried with an
external server and the behaviour is the same. I've double checked
that I can download the file through a web browser.
- I have these permisions in the manifest file:
uses-permission android:name=android.permission.INTERNET/uses-
permission
uses-permission
android:name=android.permission.WRITE_EXTERNAL_STORAGE/uses-
permission
The error:
- It starts downloading the file, I can see the text 10, 20, 30, 40,
50 and then it stops at 60.
- After a while, the emulator reboots itself.
Workarounds:
- About the possible wifi lock, what I've done is add this
permission android.permission.WAKE_LOCK and then this piece of code,
but with exactly the same behaviour:
WifiManager.WifiLock wifilock;
WifiManager manager = (WifiManager)
getSystemService(Context.WIFI_SERVICE);
wifilock = manager.createWifiLock(wifilock);
wifilock.acquire();
...
wifilock.release();
Here is the code, that it's being executing in a separate thread:
private void downloadData(){
try{
Log.v(TAG, downloading data);
URL url = new URL(http://10.0.2.2/1.zip;);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
Log.v(TAG, lenghtOfFile = +lenghtOfFile);
InputStream is = url.openStream();
File testDirectory = new
File(Environment.getExternalStorageDirectory()+/testDirectory/);
if(!testDirectory.exists()){
testDirectory.mkdir();
}
FileOutputStream fos = new
FileOutputStream(testDirectory+/
files.zip);
byte data[] = new byte[1024];
int count = 0;
long total = 0;
int progress = 0;
while ((count=is.read(data)) != -1)
{
total += count;
int progress_temp = (int)total*100/lenghtOfFile;
if(progress_temp%10 == 0 progress !=
progress_temp){
progress = progress_temp;
Log.v(TAG, total = +progress);
}
fos.write(data, 0, count);
}
is.close();
fos.close();
Log.v(TAG, downloading finished);
}catch(Exception e){
Log.v(TAG, exception in downloadData);
e.printStackTrace();
}
}
** more log description:**
00:00 It starts downloading:
V/iPhoto ( 853): downloading data
V/iPhoto ( 853): lenghtOfFile = 7732809
V/iPhoto ( 853): total = 10
V/iPhoto ( 853): total = 20
V/iPhoto ( 853): total = 30
V/iPhoto ( 853): total = 40
V/iPhoto ( 853): total = 50 (round 00:05)
- Here it stops and the DDMS disconnects the device immediatly
03:40 It finish the download (not always) and the device reboots
on its own:
I/Process ( 595): Sending signal. PID: 595 SIG: 3
I/dalvikvm( 595): threadid=7: reacting to signal 3
D/dalvikvm( 722): GC freed 2193 objects / 135808 bytes in 176 sec
V/iPhoto ( 853): total = 60
I/dalvikvm( 595): Wrote stack trace to '/data/anr/traces.txt'
I/ActivityManager( 595): Process
com.google.android.apps.maps:FriendService (pid 778) has died.
I/ActivityManager( 595): Process com.android.mms (pid 732) has
died.
V/iPhoto ( 853): total = 70
V/iPhoto ( 853): total = 80
V/iPhoto ( 853): total = 90
V/iPhoto ( 853): total = 100
V/iPhoto ( 853): downloading finished
V/iPhoto ( 853): thread finish loading
