ITBLogs.InfofindViewById in Fragment
In Fragment sub class in Android, you cannot directly use findViewById() to retrieve the control from view , similar with Activity. You need to do a single small step, this.getView(); Note that, to use this method, the view need to created, such as in onOptionsItemSelected
Code
txtTitle = (EditText)this.getView().findViewById(R.id.txt_title); |
If you wish to use it in OnCreateView, please do that in this way. At that moment, the view is not created yet, this.getView() will return null.
E.g.
Code
public View onCreateView(LayoutInflater inflater, ViewGroup container, | |
Bundle savedInstanceState) { | |
View view = inflater.inflate(R.layout.fragment_note_detail, container, false); | |
| |
txtTitle = (EditText) this.getActivity().findViewById(R.id.txt_title); |
Navigation Drawer is not opening by clicking the app icon
I spent three days about this problem. The Navigation Drawer will show if I swipe the screen from left to right. But that won't show by clicking the app icon. Actually, I missed these lines of codes:
Code
public boolean onOptionsItemSelected(MenuItem item) { | |
| |
if (mDrawerToggle.onOptionsItemSelected(item)) { | |
return true; | |
} | |
return super.onOptionsItemSelected(item); | |
} |
if (mDrawerToggle.onOptionsItemSelected(item)) { will call to show the drawer!
Error:No GMSG handler found for GMSG
I added Google Play Ads Service. However, I got this error: "No GMSG handler found for GMSG". No ads is displayed at all. I found the reason, that is because my app has not put in the play store. So, I have to add the my emulator as a test device.
Like this:
Code
AdRequest adRequest = new AdRequest.Builder()..addTestDevice(AdRequest.DEVICE_ID_EMULATOR).build(); | |
mAdView.loadAd(adRequest); |
Foreach in Java
I used foreach keyword in C#. I used it to travel element one by one in a list. In Java, there is not such keyword calls foreach. But you can use for to do that:
E.g.
Code
for(Tag tag : tags){ | |
tag.getName(); | |
} |
Hand-on for Android Studio 1.0
I was using Android Studio 0.6. In general, UI has not much changed. However, I found there are more code refactoring feature, such as generating test, create constructor and implement the interface. Those make our life easier and code faster
