Hi, friends,
let's see if someone can help me.
Summary: even when wifi lock is adquired, when the phone is running on
batteries, wifi is disconnected after a while.
I've simplified the problem to a single activity with a button that
launches a thread. It just sends 100.000 strings to an echo server
running on a PC (one string every 100ms). See code below. I can see
the traffic with Wireshark, and also the echo server shows the
strings. Notice how wifi and power locks are adquired before starting
to send (and released after, of course).
However, when the phone is running on battery and the user turns off
the phone, it keeps sending strings for some time and then wifi is
disconnected and the phone does not even respond to ping. It takes
from 600s to 6000s to be disconnected (the figures are that round, so
I think they are important).
It perfectly works when ac is connected, so I guess it is somehow
related to power management.
To test it I just launch the activity, start the echo server, start
Wireshark, press the "Start" button (android:onClick="doStart"),
blocks the phone and let it on the table. I go for lunch or whatever
and after 600-6000s I can see the tx errors on Wireshark, the echo
server has stopped receiving traffic and the phone does not respond to
ping.
The phone is 2.2, with Wifi policy set to "sleep after 15m".
Any idea?
public class Test extends Activity {
PowerManager _powerManagement = null;
PowerManager.WakeLock _wakeLock = null;
WifiManager.WifiLock _wifiLock = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void doStart(View v) {
DoerThreadFake t = new DoerThreadFake();
t.start();
}
private class DoerThreadFake extends Thread {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
((Button) findViewById(R.id.start)).setText("Doing...");
}
});
_keepOnStart();
Socket s;
byte[] buffer = new byte[1000];
try {
s = new Socket("192.168.0.16", 2000);
PrintStream ps = new PrintStream(s.getOutputStream());
InputStream is = s.getInputStream();
for (int i = 0; i < 100000; i++) {
ps.println(System.currentTimeMillis() +"("+(new
Date()).toString() +") : " + i);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
while (is.available() > 0) {
int a = is.available();
if (a > 1000) a = 1000;
is.read(buffer, 0, a); // Clean echo
}
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
_keepOnStop();
runOnUiThread(new Runnable() {
public void run() {
((Button) findViewById(R.id.start)).setText("Done");
}
});
}
private void _keepOnStart() {
if (_powerManagement == null) {
_powerManagement = (PowerManager)
getSystemService(Context.POWER_SERVICE);
}
if (_wakeLock == null) {
_wakeLock =
_powerManagement.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK |
PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.ON_AFTER_RELEASE,
"0 Backup power lock");
}
_wakeLock.acquire();
WifiManager wifiManager = (WifiManager)
getSystemService(Context.WIFI_SERVICE);
if (wifiManager != null) {
_wifiLock = wifiManager.createWifiLock("0 Backup wifi lock");
_wifiLock.acquire();
}
}
private void _keepOnStop() {
if ((_wifiLock != null) && (_wifiLock.isHeld())) {
_wifiLock.release();
}
if ((_wakeLock != null) && (_wakeLock.isHeld())) {
_wakeLock.release();
}
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android";
package="Odroid.test"
android:versionCode="1"
android:versionName="1.0"
>
<uses-sdk android:minSdkVersion="4" />
<application
android:icon="@drawable/icon"
android:label="@string/app_name"
>
<activity
android:name=".Test"
android:label="@string/app_name"
>
<intent-filter>
<action
android:name="android.intent.action.MAIN" />
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission
android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission
android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
</manifest>
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