Develop Reference

How to get rid of unwanted margin of DatePicker widget (Android)?

I am starting to learn how to develop android apps, more precisely I in trying to make an activity which host a single fragment (that extends DialogFragment) which in turn host a DatePicker Widget. I would like that DatePicker fill all screen width.
The problem is that for an unknown reason it puts a margin in the right of the screen (I want to get rid of the blank space).
This is what i get:
This is DatePicker layout:
<DatePicker
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/dialog_date_date_picker"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:calendarViewShown="false"/>
This is the activity's layout that host the fragment:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
And this is the fragment code:
public class DatePickerFragment extends DialogFragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.dialog_date, container, false);
return view;
}
}
Notice that I don't want to use 'onCreateDialog', in this particular case I want to use 'onCreateView'.

ListView on Fragment does not appear

I have made a ListView on a Fragment.
public class MyList extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.mylist, container, false);
return view;
}
}
This is the xml file where is the ListView:
<?xml version="1.0" encoding="utf-8"?>
<android.support.wearable.view.BoxInsetLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#ddffff"
xmlns:app="http://schemas.android.com/apk/res-auto"
>>
<android.support.wearable.view.WearableListView
android:id="#+id/mylist"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scrollbars="none"></android.support.wearable.view.WearableListView>
</android.support.wearable.view.BoxInsetLayout>
When I run my app the listview does not appear. The entire screen is black. What I want to know is why this is happening.

Because of the typo in the following line:
xmlns:app="http://schemas.android.com/apk/res-auto"
>>
It cannot read >>. Android doesn't throw an exception for this typo

How to insert existing fragment to Mortar architecture

Let's consider this situation. We are building an app using Mortar and Flow to simplify things and then all of the sudden we see that we can use some of the old fragments. This fragments are a little bit complex so we would like to somehow inject them to our Views.
Would that be possible if we have our Mortar View like this:
<?xml version="1.0" encoding="utf-8"?>
<com.foo.myMortarView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="+id/mortar_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:baselineAligned="false"
android:orientation="horizontal" >
<fragment
android:id="#+id/myFragment"
android:layout_width="0dp"
android:layout_weight="2"
android:layout_height="match_parent"
class="com.example.MyFragment" >
</fragment>
</com.foo.myMortarView>
And our Fragment like this:
public class MyFragment extends Fragment{
#Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
/**
* Inflate the layout for this fragment
*/
return inflater.inflate(
R.layout.my_fragment, container, false);
}
}
This of course doesn't work out of the box so how can we accomplish that? Thanks!

android backgroun does not change

I want my program to have the background color #222222. My graphical editor in eclipse shows me that it has this color but when I start the app on my device it has still a white background.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#222222" >
</LinearLayout>
in my PlaylistFragment.java :
//This is the fragment which uses this layout
public class PlaylistFragment extends Fragment {
#Override
public View onCreateView( LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState ){
return inflater.inflate(R.layout.fragment_playlist, container, false);
}
}

Android dashboard pattern as fragment

Is is possible to use the android dashboard pattern from Google I/O as a fragment so that in landscape mode on a tablet the dashboard is shown on the left while the content of the current category is shown on the right?
I've tried something that looks like the code below but it doesnt work.
main.xml:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Include dashboard -->
<include layout="#layout/fragment_dashboard"/>
<!-- Include details -->
<fragment
android:id="#+id/fragment_details"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.example.fragments.Details" />
</LinearLayout>
Details.java:
public class Details extends Fragment
{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.details, container, false);
return view;
}
}