Develop Reference

CardView doesn't work properly

I have a work with the RecyclerView, and I use the CardView as well.I have made all these standards procedures (created the ViewHolder, implemented necessary methods) but the problem is that CardView's corners aren't rounded.I get only rectangular corners of the CardView.
Here is the XML code of Adapter's "main layout":
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="250dp"
android:layout_margin="15dp"
card_view:cardElevation="10dp"
card_view:cardCornerRadius="30dp">
<RelativeLayout
android:layout_margin="20dp"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/adapterText"
android:text="#string/textCaption"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/adapterDate"
android:text="#string/date"
android:layout_marginTop="10dp"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_below="#+id/adapterText"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
</android.support.v7.widget.CardView>
And another layout with RecyclerView:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_margin="10dp"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/contactList"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
And initialization of the RecyclerView:
#Override
public void onViewCreated(View root, Bundle savedInstanceState) {
if (root != null) {
RecyclerView mRecyclerContactList=(RecyclerView)(root.findViewById(R.id.contactList));
mContactAdapter=new ContactAdapter(getContext(),mContextualMultiMode,mContactList);
mRecyclerContactList.setAdapter(mContactAdapter);
RecyclerView.ItemAnimator animator=new DefaultItemAnimator();
mRecycle
rContactList.setItemAnimator(animator);
RecyclerView.ItemDecoration mVerticalDecoration=new DividerItemDecoration
(getContext(), LinearLayoutManager.VERTICAL);
mRecyclerContactList.addItemDecoration(mVerticalDecoration);
mRecyclerContactList.setLayoutManager(new LinearLayoutManager(getContext()));
}
}
Does anybody know how to solve this issue?

Cardview as root causes strange problems to me. Try to use Relativelayout as root.

Hi try using this code
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:cardview="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="250dp"
android:baselineAligned="false"
android:elevation="6dp"
cardview:cardCornerRadius="6dp"
cardview:cardElevation="6dp"
cardview:cardPreventCornerOverlap="false"
cardview:cardUseCompatPadding="true"
cardview:contentPadding="0dp">
</android.support.v7.widget.CardView>

Use this code when you are using cardview
<android.support.v7.widget.CardView
android:id="#+id/cardview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:elevation="100dp"
card_view:cardBackgroundColor="#color/cardview_initial_background"
card_view:cardCornerRadius="8dp"
android:layout_marginLeft="#dimen/margin_large"
android:layout_marginRight="#dimen/margin_large"
>

Height MapFragment Layout not work

I'm build an app that contain two tabhost (top and botton) and in one tab, I want to put a Google Map through the Google API. All works well but the map does not display correctly. You can see better in this picture:
My code is:
fragment_mapa.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<fragment
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment"/>
</RelativeLayout>
MapaFragment.java
public class MapaFragment extends Fragment {
public MapaFragment(){}
public GoogleMap mapa;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_mapa, container, false);
if (container != null) {
container.removeAllViews();
}
GoogleMap map = ((SupportMapFragment) getActivity().getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
((MainActivity) getActivity()).setBar();
//Asigno el nombre de la vista e integro tabhost-sliding
((MainActivity) getActivity()).setTitle("Mapa");
((MainActivity) getActivity()).integrationMenu();
return rootView;
}
public void onDestroyView() {
super.onDestroyView();
Log.d("DESTROY", "onDestroyView");
Fragment f = getActivity()
.getSupportFragmentManager().findFragmentById(R.id.map);
if (f != null) {
getActivity().getSupportFragmentManager()
.beginTransaction().remove(f).commit();
}
}
}
And my activity_main.xml that contain the two tabhost and a framelayout that call the fragments:
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Estructura de los dos tabhost -->
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/LinearLayout1"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- TABHOST SUPERIOR -->
<RelativeLayout
android:id="#+id/l1"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:gravity="right"
android:layout_above="#+id/l2"
android:layout_alignParentTop="true">
<android.support.v4.app.FragmentTabHost
android:id="#+id/tabhost_sup"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TabWidget
android:id="#android:id/tabs"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="50dip"
android:layout_weight="0"/>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff">
<FrameLayout
android:id="#android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0"/>
</ScrollView>
</LinearLayout>
</android.support.v4.app.FragmentTabHost>
</RelativeLayout>
<!-- TABHOST INFERIOR -->
<RelativeLayout
android:id="#+id/l2"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="50dip"
android:layout_weight="1"
android:gravity="right"
android:layout_alignParentBottom="true"
android:background="#android:color/background_light" >
<android.support.v4.app.FragmentTabHost
android:id="#android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:id="#+id/RelativeLayout1"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<FrameLayout
android:id="#android:id/tabcontent"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="0"/>
<TabWidget
android:id="#android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:layout_marginBottom="0dp"/>
</LinearLayout>
</android.support.v4.app.FragmentTabHost>
</RelativeLayout>
</RelativeLayout>
<!-- Listview to display slider menu -->
<ListView
android:id="#+id/list_slidermenu"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="#color/list_divider"
android:dividerHeight="1dp"
android:listSelector="#drawable/list_selector"
android:background="#color/list_background"/>
<ListView
android:id="#+id/right_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="end"
android:choiceMode="singleChoice"
android:divider="#color/list_divider"
android:dividerHeight="1dp"
android:listSelector="#drawable/list_selector"
android:background="#color/list_background"/>
</android.support.v4.widget.DrawerLayout>

Removing scrollview is not convinient solution.Instead of it try android:FillViewPort="True" for Scrollview in your layout solve your problem for all screen where you may require scroll for your activity content.Hope this helps you!!

SOLUTION (by Hardik):
Remove the scrollview in my activity_main.xml and it works well.

Use hierarchiviewer of android tools to check layout values.

For the future:
If you have a ScrollView then elements must specify their height (width for horizontal scroll view) otherwise what height should they have, infinite?
I also had an issue where the exact thing happened when placing the map fragment inside a Relative Layout that had height = Wrap_Content, with minimum height.
Setting a constant height resolved the issue, same idea.

came across this same issue but my map fragment is inside a scrollview and it needs to have a scrollview since there are also other views aside from the map. if it only contains the map, then yes scrollview is not needed.

ScrollView not scrolled with weights in it

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:measureAllChildren="true"
android:overScrollMode="ifContentScrolls" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<FrameLayout
android:id="#+id/viewPagerLayout"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
contents like button textview are here
</FrameLayout>
<FrameLayout
android:id="#+id/viewPagerLayout"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
contents like button textview are here
</FrameLayout>
</LinearLayout>
</Scrollview>
While KeyBoard popup the scrollview is not scrolled as we think ...

Dynamically adding TextView to ScrollView on Android

I try to make a ScrollView to act like a ListView. So every row will be a TextView added dynamically. but the program crashes. I have a ScrollView inside a LinearLayout. What i do wrong? Thanks.
Here is my code
scroll = (ScrollView)findViewById(R.id.scrollView1);
layout = (LinearLayout) findViewById(R.id.LinearLayout1);
layout.setBackgroundColor(Color.TRANSPARENT);
TextView[] tx = new TextView[10];
for (int i = 0; i < 10; i++) {
tx[i] = new TextView(HelloWorldActivity.this);
tx[i].setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
tx[i].setText("This is the textviewNo" + i);
layout.addView(tx[i]);
}
scroll.addView(layout);
XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/RelativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_horizontal"
android:orientation="vertical" >
<TextView
android:id="#+id/timeflag"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="50sp"
android:gravity="center"/>
<Button
android:id="#+id/pause"
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_alignParentLeft="true"
android:layout_below="#+id/timeflag"
android:layout_marginTop="37dp"
android:text="Start" />
<LinearLayout
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_below="#+id/pause"
android:orientation="vertical" >
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ScrollView>
</LinearLayout>
</RelativeLayout>

A scrollView Can only have one child. If you try to add more than 1 child to the scroll view then it will crash. You should have the LinearLayout inside of the scrollview and then dynamically add textViews to the linear layout.

You are trying to add LinearLayout1 as its own child's child (being your own grandfather, is a confusing notion).
Change you XML around like this:
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_below="#+id/pause"
>
<LinearLayout
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
</LinearLayout>
</ScrollView>

You cannot add views to a scrollview. You can only add them to a viewgroup, like linear or relativelayout.
It is not exactly clear what you are trying to achieve, but what is wrong with using a listview for this? You could set a max height on the listview. Or you could try wdziemia's suggestion

Android how to add a Linearlayout to another LinearLayout from code

I have a LinearLayout in main.xml:
<?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="fill_parent"
android:orientation="vertical"
android:id="#+id/mainLayout" >
</LinearLayout>
I have made another XML file, called item_box.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/item_bg"
android:gravity="right" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/icon" />
<CheckBox
android:id="#+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginRight="20dp"
android:text="#string/item1"
android:textSize="30dp" />
<TextView
android:id="#+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginRight="20dp"
android:gravity="right"
android:text="#string/number1"
android:textColor="#color/number_bg"
android:textSize="30dp" />
</LinearLayout>
Basically, what I want to do from the code (programmatically), is add a couple item_box.xml into the main.xml. How can I accomplish this?

LinearLayout mainLayout = (LinearLayout)findViewById(R.id.main);
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemBox = inflater.inflate(R.layout.item_box);
mainLayout.addView(itemBox);

try this linearlayout inside another linearlayout add id to linearlayout layout1.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/firstlayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
</LinearLayout>
in oncreate() call
LinearLayout firstlayout=(LinearLayout)findviewbyId(R.id.firstlayout);
LinearLayout secondlayoout=(LinearLayout)this.getLayoutInflater().inflate(R.layout.layout2,null); //inflating view from xml
TextView btn1=(TextView)secondlayoout.findviewbyId(R.id.button1);
btn1.settext("TEST");
firstlayout.addview(secondlayoout);

You are getting a Nullpointer because linearLayout1 is not in mainLayout. You need to inflate your view first and then add it. You should read this question I think it will help you.

Use LayoutInflater:
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemBox = inflater.inflate(R.layout.item_box);