Handling Airplane Mode with HTTP Requests

Handling Airplane Mode with HTTP Requests

My app has quite a few occasions where it makes HTTP post requests. I
discovered during testing that if the user is in airplane mode when this
request is made, the app crashes. So, in an effort to handle this
situation elegantly, I call a function that tests whether the phone is in
airplane mode immediately prior to making the AsyncTask call. If the
function returns true, I don't make the AsyncTask call.
The test itself works correctly. The user is notified that they must turn
off airplane mode and them come back and try again. The problem is that
after airplane mode is turned off, and the AsyncTask proceeds, my HTTP
post crashes the app. If airplane mode was never on in the first place,
everything runs smoothly.
I can't figure out what to do. Is there a better way to test for airplane
mode in the first place? Or is there something else that I need to do
after blocking the AsyncTask to restore the system state such that the
http request will succeed.
Any advice is appreciated. Here is some code to hopefully make this more
clear. If there is additional code that will help, please let me know.
Thanks!
public class LoginActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
context = this;
btnLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
UserFunctions userFunction = new UserFunctions(context);
if (userFunction.isAirplaneModeOn(context)) {
userFunction.warnAboutAirplaneMode(context);
return;
}
new Login().execute();
});
}
class Login extends AsyncTask<String, String, String> {
private JSONParser jsonParser = new JSONParser();
private JSONObject json;
@Override
protected String doInBackground(String... args) {
String URL = context.getResources().getString(R.string.dbURL)
+ context.getResources().getString(R.string.attemptLogin_php);
//this next line is the one that crashes - iff the
user was
// previously in airplane mode. If there weren't ever
in airplane
// mode, this runs just fine
json = jsonParser.makeHttpRequest(URL, params);
...
}
}
Here is the UserFunctions class:
public class UserFunctions {
@SuppressLint( "NewApi" )
@SuppressWarnings("deprecation")
public boolean isAirplaneModeOn(Context context) {
if(Build.VERSION.SDK_INT >=
Build.VERSION_CODES.JELLY_BEAN_MR1){
return
Settings.Global.getInt(context.getContentResolver(),
Settings.Global.AIRPLANE_MODE_ON, 0) != 0;
} else {
return
Settings.System.getInt(context.getContentResolver(),
Settings.System.AIRPLANE_MODE_ON, 0) != 0;
}
}
public void warnAboutAirplaneMode(Context context) {
AlertDialog.Builder builder = new
AlertDialog.Builder(context)
.setTitle("Airplane Mode Is On")
.setIcon(R.raw.airplane_mode)
.setCancelable(false)
.setMessage("Your phone is in airplane mode. Please
turn this off then try again.")
.setNeutralButton("OK", new
DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}