fernandes.io

Working on the same android app which I posted about a couple of times earlier, I had this one feature I wanted to implement where I show a list of persons and highlight those from that list who have a birthday today. I tried a couple of different approaches to to the "highlight" the list items which had a birthday today for e.g: setting the background colour for those items, setting up a background icon for those, changing the text colour of the list item, and with all of these I faced 1 common problem: if I had to scroll the list or expand/collapse one item group (in case of ExpandableListView ), then it would end up highlighting some random items from the list, and if I continued that excercise, finally almost all items would get highlighted. Since I had used an ExpandableListView , my getGroupView method looked somewhat like this: @Override  public View getGroupView(int groupPosition, ..., ViewGroup parent) {   Person person = (Person) getGroup(groupPosition);  ...

In an android app that I'm currently working on, I wanted use Android's Preference API to provide an interface to modify some app specific settings. I didn't want to create another Activity or PreferenceActivity for that, and hence I thought of simply using a PreferenceFragment . Now, in my project I already had a MainActivity ( extends ActionBarActivity ) which had a MainFragment wired up to it somewhat like this in it's onCreate method: getSupportFragmentManager().beginTransaction()  .add(R.id.container, new MainFragment())  .commit(); And because of that I knew that I had to replace the existing MainFragment with my new SettingsFragment which extended PreferenceFragment . With that in mind, I went ahead and added the following to my MainActivity 's onOptionsItemSelected : getFragmentManager().beginTransaction()  .replace(R.id.container, new SettingsFragment())  .addToBackStack(null)  .commit(); When I saw this work in the emulator, it looked some...

I wanted to test a small android app which I was working on, on my phone. I had already tested this app on an emulator and even on a physical device - my phone earlier, but I had done that via ADB. However, I wanted to install it this time from the apk file. Now, when I ran gradlew assembleRelease there were 2 apk files generated in the projectname /build/apk directory. One named projectname -debug-unaligned.apk and the other named projectname -release-unsigned.apk . The release unsigned one seemed to be the right one to try out. So I tried installing it on my phone. Everything went on well until I saw a message when it had just seemed like the app was installed which actually read: "Application not installed". I was a bit confused looking at the message, I didn't quite understand what went wrong as there was no details as to what went wrong in the message. I had pretty much everything configured the way I thought would be required like checking off the box against ...