Exception on Android 4.0 `android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode)`

Question

When I run this piece of code on Android 2.3.6, it works fine. On 4.0 I get a StrictMode exception. From some questions on SO, seems like you cant do network operations on the UI thread. But I am not doing any UI operation on the UI thread.

I am calling doBackground directly and not execute, since I need to check the return value of the doBackground. I guess the below should have worked.

What am I missing here ?

handler.postDelayed(new Runnable() {
@Override
public void run() {
    God.identityHash = (String) new SwitchServer((IActionBar) splashScreen,
                God.mCruiseOnServer, nameText, phoneNumberText)
                .doInBackground(null);

    if (!mIsBackButtonPressed && God.identityHash != null) {
        FlurryAgent.logEvent(God.TCACCEPTED_AND_REGISTERED);
        Intent intent = new Intent(SplashScreen.this, HomeScreen.class);
        SplashScreen.this.startActivity(intent);
        finish();
    } else {
        Toast.makeText(splashScreen,
            "Unable to save your details. Please try again.",
            Toast.LENGTH_LONG).show();
        God.setTermsAndConditions(splashScreen, false);
    }
}
}, SPLASH_DURATION);

Edit : Strict mode is not enabled on the phone.

is that `AsyncTask` or something else, I really can't understand what are you trying to do here — hardartcore, Apr 10 '13 at 08:57
Yes, I am not using AsyncTask in its "normal" way at this one place. — Siddharth, Apr 10 '13 at 08:59
I suggest you to use AsyncTask to achieve the thing that you want. — hardartcore, Apr 10 '13 at 09:45

score 3 · Accepted Answer · answered Apr 10 '13 at 08:57

3

Firstly, StrictMode is something you explicitly turned on from code, it is just a debugging aid, and should not be left on in production code.

Secondly, calling .doInBackground manually means running it on the UI thread. If you use AsyncTask as intended, you get its return value as a parameter in .onPostExecute.

answered Apr 10 '13 at 08:57

P Varga

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I am calling doInBackground in a handler runnable, silly question, but doesnt that take doInBackground OFF the UI thread ? – Siddharth Apr 10 '13 at 08:59
No, the message handler runs it (albeit delayed), which means the UI thread. – P Varga Apr 10 '13 at 09:01

Exception on Android 4.0 `android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode)`

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