Implement this 2 methods in your all your required activity.
boolean flag = true;
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
if(flag)
Toast.makeText(getApplicationContext(), "start", 1).show();
else
{
Toast.makeText(getApplicationContext(), "Restart 2", 1).show();
Intent i = new Intent(SecondActivity.this,MainActivity.class);
finish();
startActivity(i);
}
}
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Toast.makeText(getApplicationContext(), "Restart", 1).show();
flag = false;
}
so when you re open app from background than it will redirect to your LoginActivity.